{"id":11461,"date":"2023-09-12T09:19:20","date_gmt":"2023-09-12T09:19:20","guid":{"rendered":"https:\/\/xometry.pro\/articles\/injection-molding-finishes\/"},"modified":"2025-03-05T11:57:36","modified_gmt":"2025-03-05T10:57:36","slug":"injection-moulding-finishes","status":"publish","type":"articles","link":"https:\/\/xometry.pro\/en-uk\/articles\/injection-moulding-finishes\/","title":{"rendered":"Injection Molding Surface Finishes: SPI and VDI"},"content":{"rendered":"<div role=\"navigation\" aria-label=\"Table of Contents\" class=\"simpletoc wp-block-simpletoc-toc\"><h2 class=\"simpletoc-title\">Table of Contents<\/h2>\n<ul class=\"simpletoc-list\">\n<li><a href=\"#h-need-for-surface-finishing\">Need for Surface Finishing<\/a>\n\n<\/li>\n<li><a href=\"#prime-factors-deciding-the-surface-finish\">Prime Factors Deciding the Surface Finish<\/a>\n\n\n<\/li>\n\n<li><a href=\"#spi-surface-finish-for-injection-moulding\">SPI Surface Finish for Injection Moulding<\/a>\n\n<\/li>\n<li><a href=\"#vdi-std-surface-finish-for-injection-moulding\">VDI (STD) Surface Finish for Injection Moulding<\/a>\n\n<\/li>\n<li><a href=\"#conclusion\">Conclusion<\/a>\n\n<\/li>\n<li><a href=\"#get-your-free-injection-moulding-finishes-card\">Get Your Free Injection Moulding Finishes Card<\/a>\n<\/li><\/ul><\/div>\n\n\n<p>Plastic injection moulded parts often require finishing for the end use. There are a variety of surface finish options available for injection moulding that influence the texture, look, feel, and other surface characteristics of the parts. Not only from a customer point of view but also from a designer&#8217;s and engineer&#8217;s perspective, it\u2019s an important design consideration as it is essential for the mould design.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-need-for-surface-finishing\"><strong>Need for Surface Finishing<\/strong><\/h2>\n\n\n<p>Most moulds are machined from aluminium and\/or steel and the moulded part will pick up even the smallest imperfection in the mould surfaces. The machining marks left by the end mills will be transferred to the moulded part if not removed by bead blasting or polishing. In many cases, particularly on the inside of a part which is not visible to the eye, the tooling marks can be left on the mould and it will make no difference to the function or cosmetics of the part.&nbsp;<\/p>\n\n\n\n<p>Those surfaces which are visible, however, require additional finishing. Almost all moulds are finished to some degree, but the more polishing required, the higher the cost of the mould tooling and the longer it will take to complete the mould.<\/p>\n\n\n    <aside class=\"article-content-aside\">\r\n        <a href=\"https:\/\/xometry.pro\/en-uk\/topic\/translucent-material-recommendation-injection-molding\/\" class=\"aside-image sidebar__aside-image\"><img decoding=\"async\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/11\/community-icon-1.svg\" alt=\"\"><\/a><a href=\"https:\/\/xometry.pro\/en-uk\/topic\/translucent-material-recommendation-injection-molding\/\" class=\"aside-link\">Translucent material recommendation &#8211; injection molding<\/a>    <\/aside>\r\n    \n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"1024\" height=\"540\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Injection-moulding-part-without-surface-finish-1-1024x540.png\" alt=\"Injection molding part without surface finish\" class=\"wp-image-2106\" style=\"max-width:728px;max-height:395px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Injection-moulding-part-without-surface-finish-1-1024x540.png 1024w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Injection-moulding-part-without-surface-finish-1-300x158.png 300w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Injection-moulding-part-without-surface-finish-1-768x405.png 768w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Injection-moulding-part-without-surface-finish-1.png 1074w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Injection-moulding-part-without-surface-finish-1.png\" data-fancybox=\"gallery-11461\" data-caption=\"Injection moulding part without surface finish\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Injection-moulding-part-without-surface-finish-1.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Injection moulding part without surface finish<\/figcaption><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"prime-factors-deciding-the-surface-finish\"><strong>Prime Factors Deciding the Surface Finish<\/strong><\/h2>\n\n\n<p>Surface finishing in injection moulding is different from CNC machining or 3D printing surface finishes. While in the latter two, surface finishing is done after the part is made, as an extra step, whereas in the former, the mould surface itself is prepared in such a way (texturing) that the part comes out finished. For example, if the required part needs a matte finish, the inside of the mould is textured in such a way that the moulded part comes out with a matte finish. Here are the factors that decide the finish:<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"increasing-the-visual-appeal-of-the-part\"><strong>Increasing the Visual Appeal of the Part<\/strong><\/h3>\n\n\n<p>Part designers may choose texturing for several aesthetic reasons. A smooth or matte texture on the surface of a part not only improves the appearance and gives a finished look but also hides the imperfections such as flow lines, knit lines, sink marks and shadow marks that are caused as a result of injection moulding. From a commercial perspective, parts with good surface finish appeal to the customer.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"improving-the-functionality-of-the-part\"><strong>Improving the Functionality of the Part<\/strong><\/h3>\n\n\n<p>Surface texturing improves paint adhesion and sticker adhesion. For example, a matte textured part can easily hold the paint on it for a longer time and is even good for sticking a label. It also improves the gripping of the part. By texturing the mould surface, we can also avoid plastic defects like short shots and flash. A properly designed and textured mould can also help in escaping the trapped gasses.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"spi-surface-finish-for-injection-moulding\"><strong>SPI Surface Finish for Injection Moulding<\/strong><\/h2>\n\n\n<p>The Society of Plastics Industry (SPI) has set several standard finishing procedures that result in different part surface finishes. The mould can be textured with machines or polished manually. They are explained in the below table.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"600\" height=\"338\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/SPI-Finishes-light.gif\" alt=\"SPI finishes\" class=\"wp-image-2091\" style=\"aspect-ratio:1.776470588235294;max-width:840px;height:auto\"\/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/SPI-Finishes-light.gif\" data-fancybox=\"gallery-11461\" data-caption=\"SPI finishes\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/SPI-Finishes-light.gif\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">SPI finishes<\/figcaption><\/figure>\n\n\n<div class=\"custom-table-block \" id=\"table-id-409\" >\r\n\t<div class=\"search-input-wrapper\">\r\n\t\t<svg width=\"16\" height=\"16\" viewBox=\"0 0 16 16\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\r\n\t\t\t<path d=\"M15.7812 13.833L12.6659 10.7177C12.5252 10.5771 12.3346 10.499 12.1347 10.499H11.6253C12.4877 9.39596 13.0002 8.00859 13.0002 6.49937C13.0002 2.90909 10.0911 0 6.50083 0C2.91056 0 0.00146484 2.90909 0.00146484 6.49937C0.00146484 10.0896 2.91056 12.9987 6.50083 12.9987C8.01006 12.9987 9.39742 12.4863 10.5004 11.6239V12.1332C10.5004 12.3332 10.5786 12.5238 10.7192 12.6644L13.8345 15.7797C14.1282 16.0734 14.6032 16.0734 14.8938 15.7797L15.778 14.8954C16.0718 14.6017 16.0718 14.1267 15.7812 13.833ZM6.50083 10.499C4.29167 10.499 2.50122 8.71165 2.50122 6.49937C2.50122 4.29021 4.28855 2.49976 6.50083 2.49976C8.70999 2.49976 10.5004 4.28708 10.5004 6.49937C10.5004 8.70852 8.71311 10.499 6.50083 10.499Z\" fill=\"#476175\"\/>\r\n\t\t<\/svg>\r\n\t\t<input type=\"search\" class=\"table-search-input\" id=\"table-search-409\" placeholder=\"Table search\">\r\n\t<\/div>\t\r\n\t<div class=\"table-wrapper\">\r\n\t\t<table style=\"border-collapse: collapse; width: 100%; height: 360px;\">\n<tbody>\n<tr style=\"height: 72px;\">\n<td style=\"width: 20%; height: 72px;\"><strong>SPI finish<\/strong><\/td>\n<td style=\"width: 20%; height: 72px;\"><strong>Description<\/strong><\/td>\n<td style=\"width: 20%; height: 72px;\"><strong>Applications<\/strong><\/td>\n<td style=\"width: 20%; height: 72px;\"><strong>Surface roughness<br \/>\n(Ra \u00b5m)<\/strong><\/td>\n<td style=\"width: 20%; height: 72px;\"><strong>Suitable materials<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\"><strong>A-1<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\">Grade #3, 6000 Grit Diamond Buff<\/td>\n<td style=\"width: 20%; height: 24px;\">High polish parts<\/td>\n<td style=\"width: 20%; height: 24px;\">0.012- 0.025<\/td>\n<td style=\"width: 20%; height: 24px;\">Acrylic<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\"><strong>A-2<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\">Grade #6, 3000 Grit Diamond Buff<\/td>\n<td style=\"width: 20%; height: 24px;\">High polish parts<\/td>\n<td style=\"width: 20%; height: 24px;\">0.025-0.05<\/td>\n<td style=\"width: 20%; height: 24px;\">Acrylic, PC<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\"><strong>A-3<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\">Grade #15, 1200 Grit Diamond Buff<\/td>\n<td style=\"width: 20%; height: 24px;\">High low polish parts<\/td>\n<td style=\"width: 20%; height: 24px;\">0.05-0.10<\/td>\n<td style=\"width: 20%; height: 24px;\">ABS, Acrylic. PS, Nylon, PC<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\"><strong>B-1<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\">600 Grit Paper<\/td>\n<td style=\"width: 20%; height: 24px;\">Medium polish parts<\/td>\n<td style=\"width: 20%; height: 24px;\">0.05-0.10<\/td>\n<td style=\"width: 20%; height: 24px;\">ABS, Acrylic, PP. PS, HDPE, Nylon, PC<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\"><strong>B-2<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\">400 Grit Paper<\/td>\n<td style=\"width: 20%; height: 24px;\">Medium polish parts<\/td>\n<td style=\"width: 20%; height: 24px;\">0.10- 0.15<\/td>\n<td style=\"width: 20%; height: 24px;\">ABS, Acrylic, PP. PS, HDPE, Nylon, PC<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\"><strong>B-3<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\">320 Grit Paper<\/td>\n<td style=\"width: 20%; height: 24px;\">Medium low polish parts<\/td>\n<td style=\"width: 20%; height: 24px;\">0.28-0.32<\/td>\n<td style=\"width: 20%; height: 24px;\">ABS, Acrylic, PP. PS, HDPE, Nylon<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\"><strong>C-1<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\">600 Stone<\/td>\n<td style=\"width: 20%; height: 24px;\">Low polish parts<\/td>\n<td style=\"width: 20%; height: 24px;\">0.35-0.40<\/td>\n<td style=\"width: 20%; height: 24px;\">ABS, Acrylic, PP. PS, HDPE, Nylon, TPU<\/td>\n<\/tr>\n<tr style=\"height: 48px;\">\n<td style=\"width: 20%; height: 48px;\"><strong>C-2<\/strong><strong><br \/>\n<\/strong><\/td>\n<td style=\"width: 20%; height: 48px;\">400 Stone<\/td>\n<td style=\"width: 20%; height: 48px;\">Low polish parts<\/td>\n<td style=\"width: 20%; height: 48px;\">0.45-0.55<\/td>\n<td style=\"width: 20%; height: 48px;\">ABS, Acrylic, PP. PS, HDPE, Nylon, TPU<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\"><strong>C-3<\/strong><strong><br \/>\n<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\">320 Stone<\/td>\n<td style=\"width: 20%; height: 24px;\">Low polish parts<\/td>\n<td style=\"width: 20%; height: 24px;\">0.63-0.70<\/td>\n<td style=\"width: 20%; height: 24px;\">ABS, Acrylic, PP. PS, HDPE, Nylon, TPU<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\"><strong>D-1<\/strong><strong><br \/>\n<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\">Dry Blast Glass Bead<\/td>\n<td style=\"width: 20%; height: 24px;\">Satin finish<\/td>\n<td style=\"width: 20%; height: 24px;\">0.80-1.00<\/td>\n<td style=\"width: 20%; height: 24px;\">ABS, PP. PS, HDPE, Nylon, PC, TPU<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\"><strong>D-2<\/strong><strong><br \/>\n<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\">Dry Blast #240 Oxide<\/td>\n<td style=\"width: 20%; height: 24px;\">Dull finish<\/td>\n<td style=\"width: 20%; height: 24px;\">1.00-2.80<\/td>\n<td style=\"width: 20%; height: 24px;\">ABS, PP. PS, HDPE, Nylon, TPU<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 20%;\"><strong>D-3<\/strong><strong><br \/>\n<\/strong><\/td>\n<td style=\"width: 20%;\">Dry Blast #24 Oxide<\/td>\n<td style=\"width: 20%;\">Dull finish<\/td>\n<td style=\"width: 20%;\">3.20-18<\/td>\n<td style=\"width: 20%;\">ABS, PP. PS, HDPE, Nylon, TPU<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\t<\/div>\r\n<\/div>\r\n<style>\r\n\t.custom-table-block table{\r\n\t\theight: initial!important;\r\n\t}\r\n\t.search-input-wrapper{\r\n\t\tposition: relative;\r\n\t\tmargin-bottom: 24px;\r\n\t}\r\n\t.search-input-wrapper svg{\r\n\t\tposition: absolute;\r\n\t\ttop:50%;\r\n\t\tleft:12px;\r\n\t\ttransform: translateY(-50%);\r\n\t}\r\n\t.table-search-input{\r\n\t\tpadding: 0 0 0 40px;\r\n\t\tborder:1px solid #C1CAD1;\r\n\t\theight: 44px;\r\n\t\twidth: 201px;\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t}\r\n\t.table-search-input::placeholder{\r\n\t\tcolor:#092C47;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\ttext-align: left;\r\n\t\twhite-space:nowrap;\r\n\t}\r\n\t\r\n\t.custom-table-block thead{\r\n\t\tmargin-bottom: 14px;\r\n\t}\r\n\r\n\t.custom-table-block tbody tr:nth-child(odd){\r\n\t\tbackground-color: #F6F9FF;\r\n\t}\r\n\r\n\t.custom-table-block tbody, .custom-table-block thead, .custom-table-block tr, .custom-table-block td, .custom-table-block th{\r\n\t\theight: initial!important;\r\n\t}\r\n\t\r\n\t.custom-table-block tbody td{\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tpadding: 7px;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 700;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tcolor:#092C47;\r\n\t\tposition: relative;\r\n\t}\r\n\t.custom-table-block thead th:after{\r\n\t\tcontent:\"\";\r\n\t\tdisplay: inline-block;\r\n\t\tbackground-image: url(\"data:image\/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http:\/\/www.w3.org\/2000\/svg'%3E%3Cpath d='M10.585 0.585938L6 5.17094L1.415 0.585938L0 2.00094L6 8.00094L12 2.00094L10.585 0.585938Z' fill='%23476175'\/%3E%3C\/svg%3E%0A\");\r\n\t\tmargin-left: 8px;\r\n\t\tbackground-position: center center;\r\n\t\tbackground-size: 12px 7.5px;\r\n\t\tbackground-repeat: no-repeat;\r\n\t\twidth: 24px;\r\n\t\theight: 12px;\r\n\t}\r\n\t.custom-table-block{\r\n\t\tmargin: 20px 0;\t\r\n\t}\r\n\t.custom-table-block .table-wrapper{\r\n\t\twidth: 100%;\r\n\t\toverflow-x: auto;\r\n\t}\r\n\t@media(max-width: 768px){\r\n\t\t\/* .custom-table-block tbody td{\r\n\t\t\twhite-space: nowrap;\r\n\t\t} *\/\r\n\t\t.custom-table-block .table-wrapper{\r\n\t\t\tmax-width: calc(100vw - 16px);\r\n\t\t}\r\n\t}\r\n<\/style>\r\n\n\n<h2 class=\"wp-block-heading\" id=\"vdi-std-surface-finish-for-injection-moulding\"><strong>VDI (STD) Surface Finish for Injection Moulding<\/strong><\/h2>\n\n\n<p>VDI 3400 Surface Finish (commonly known as VDI surface finish) refers to the mould texture standard set by Verein Deutscher Ingenieure (VDI), the Society of German Engineers. The VDI 3400 surface finish is mainly processed by Electrical Discharge Machining (EDM) when mould machining. It could also be done by the traditional texturing method (like in SPI). Although the standards are set by the society of German Engineers it is commonly used among tool makers all over, including North America, Europe, and Asia.<\/p>\n\n\n    <section class=\"article-slider-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <!-- Swiper -->\r\n            <div class=\"swiper mySwiper2 article-slider-display\">\r\n                <div class=\"swiper-wrapper\">\r\n                                                <div class=\"swiper-slide\">\r\n                                <div class=\"wp-block-image__wrap\">\r\n                                    <img decoding=\"async\"  src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/10\/STD-Finishes-light.gif\" alt=\"Injection moulding VDI surface finishes\"\r\n                                    >\r\n                                    <a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/10\/STD-Finishes-light.gif\" data-fancybox=\"gallery\" data-caption=\"\" aria-label=\"Open full image\">\r\n                                        <img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/10\/STD-Finishes-light.gif\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"Injection moulding VDI surface finishes\" loading=\"lazy\" decoding=\"async\">\r\n                                        <svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n                                            <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"><\/path>\r\n                                        <\/svg>\r\n                                    <\/a>\r\n                                <\/div>\r\n                                <div class=\"article-slider-text\">\r\n                                                                    <\/div>\r\n                            <\/div>\r\n                            \r\n                                                        <div class=\"swiper-slide\">\r\n                                <div class=\"wp-block-image__wrap\">\r\n                                    <img decoding=\"async\"  src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2024\/05\/IMG_6730-ezgif.com-video-to-gif-converter.gif\" alt=\"Injection molding \"\r\n                                    >\r\n                                    <a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2024\/05\/IMG_6730-ezgif.com-video-to-gif-converter.gif\" data-fancybox=\"gallery\" data-caption=\"\" aria-label=\"Open full image\">\r\n                                        <img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2024\/05\/IMG_6730-ezgif.com-video-to-gif-converter.gif\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"Injection molding \" loading=\"lazy\" decoding=\"async\">\r\n                                        <svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n                                            <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"><\/path>\r\n                                        <\/svg>\r\n                                    <\/a>\r\n                                <\/div>\r\n                                <div class=\"article-slider-text\">\r\n                                                                    <\/div>\r\n                            <\/div>\r\n                            \r\n                                                        <div class=\"swiper-slide\">\r\n                                <div class=\"wp-block-image__wrap\">\r\n                                    <img decoding=\"async\"  src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2024\/05\/injection-moulding-finishes-card-white.gif\" alt=\"Injection molding finishes card, white\"\r\n                                    >\r\n                                    <a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2024\/05\/injection-moulding-finishes-card-white.gif\" data-fancybox=\"gallery\" data-caption=\"\" aria-label=\"Open full image\">\r\n                                        <img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2024\/05\/injection-moulding-finishes-card-white.gif\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"Injection molding finishes card, white\" loading=\"lazy\" decoding=\"async\">\r\n                                        <svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n                                            <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"><\/path>\r\n                                        <\/svg>\r\n                                    <\/a>\r\n                                <\/div>\r\n                                <div class=\"article-slider-text\">\r\n                                                                    <\/div>\r\n                            <\/div>\r\n                            \r\n                                            <\/div>\r\n            <\/div>\r\n            <div thumbsSlider=\"\" class=\"swiper mySwiper article-slider-list\">\r\n                <div class=\"swiper-wrapper\">\r\n                                            <div class=\"swiper-slide\">\r\n                            <img decoding=\"async\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/10\/STD-Finishes-light.gif\" alt=\"Injection moulding VDI surface finishes\">\r\n                        <\/div>\r\n                                                <div class=\"swiper-slide\">\r\n                            <img decoding=\"async\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2024\/05\/IMG_6730-ezgif.com-video-to-gif-converter.gif\" alt=\"Injection molding \">\r\n                        <\/div>\r\n                                                <div class=\"swiper-slide\">\r\n                            <img decoding=\"async\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2024\/05\/injection-moulding-finishes-card-white.gif\" alt=\"Injection molding finishes card, white\">\r\n                        <\/div>\r\n                                        <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/section>\r\n    \n\n\n<p>VDI values are based on the surface roughness. From the image, we see different textures of the surface finish with varying values of surface roughness.<\/p>\n\n\n<div class=\"custom-table-block \" id=\"table-id-435\" >\r\n\t<div class=\"search-input-wrapper\">\r\n\t\t<svg width=\"16\" height=\"16\" viewBox=\"0 0 16 16\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\r\n\t\t\t<path d=\"M15.7812 13.833L12.6659 10.7177C12.5252 10.5771 12.3346 10.499 12.1347 10.499H11.6253C12.4877 9.39596 13.0002 8.00859 13.0002 6.49937C13.0002 2.90909 10.0911 0 6.50083 0C2.91056 0 0.00146484 2.90909 0.00146484 6.49937C0.00146484 10.0896 2.91056 12.9987 6.50083 12.9987C8.01006 12.9987 9.39742 12.4863 10.5004 11.6239V12.1332C10.5004 12.3332 10.5786 12.5238 10.7192 12.6644L13.8345 15.7797C14.1282 16.0734 14.6032 16.0734 14.8938 15.7797L15.778 14.8954C16.0718 14.6017 16.0718 14.1267 15.7812 13.833ZM6.50083 10.499C4.29167 10.499 2.50122 8.71165 2.50122 6.49937C2.50122 4.29021 4.28855 2.49976 6.50083 2.49976C8.70999 2.49976 10.5004 4.28708 10.5004 6.49937C10.5004 8.70852 8.71311 10.499 6.50083 10.499Z\" fill=\"#476175\"\/>\r\n\t\t<\/svg>\r\n\t\t<input type=\"search\" class=\"table-search-input\" id=\"table-search-435\" placeholder=\"Table search\">\r\n\t<\/div>\t\r\n\t<div class=\"table-wrapper\">\r\n\t\t<table style=\"border-collapse: collapse; width: 100%; height: 336px;\">\n<tbody>\n<tr style=\"height: 48px;\">\n<td style=\"width: 25%; height: 48px;\"><strong>VDI Value<\/strong><\/td>\n<td style=\"width: 25%; height: 48px;\"><strong>Description<\/strong><\/td>\n<td style=\"width: 25%; height: 48px;\"><strong>Applications<\/strong><\/td>\n<td style=\"width: 25%; height: 48px;\"><strong>Surface roughness (Ra \u00b5m)<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>12<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">600 Stone<\/td>\n<td style=\"width: 25%; height: 24px;\">Low polish parts<\/td>\n<td style=\"width: 25%; height: 24px;\">0.40<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>15<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">400 Stone<\/td>\n<td style=\"width: 25%; height: 24px;\">Low polish parts<\/td>\n<td style=\"width: 25%; height: 24px;\">0.56<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>18<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">Dry Blast Glass Bead<\/td>\n<td style=\"width: 25%; height: 24px;\">Satin finish<\/td>\n<td style=\"width: 25%; height: 24px;\">0.80<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>21<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">Dry Blast # 240 Oxide<\/td>\n<td style=\"width: 25%; height: 24px;\">Dull finish<\/td>\n<td style=\"width: 25%; height: 24px;\">1.12<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>24<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">Dry Blast # 240 Oxide<\/td>\n<td style=\"width: 25%; height: 24px;\">Dull finish<\/td>\n<td style=\"width: 25%; height: 24px;\">1.60<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>27<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">Dry Blast # 240 Oxide<\/td>\n<td style=\"width: 25%; height: 24px;\">Dull finish<\/td>\n<td style=\"width: 25%; height: 24px;\">2.24<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>30<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">Dry Blast # 24 Oxide<\/td>\n<td style=\"width: 25%; height: 24px;\">Dull finish<\/td>\n<td style=\"width: 25%; height: 24px;\">3.15<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>33<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">Dry Blast # 24 Oxide<\/td>\n<td style=\"width: 25%; height: 24px;\">Dull finish<\/td>\n<td style=\"width: 25%; height: 24px;\">4.50<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>36<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">Dry Blast # 24 Oxide<\/td>\n<td style=\"width: 25%; height: 24px;\">Dull finish<\/td>\n<td style=\"width: 25%; height: 24px;\">6.30<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>39<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">Dry Blast # 24 Oxide<\/td>\n<td style=\"width: 25%; height: 24px;\">Dull finish<\/td>\n<td style=\"width: 25%; height: 24px;\">9.00<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>42<\/strong><strong><br \/>\n<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">Dry Blast # 24 Oxide<\/td>\n<td style=\"width: 25%; height: 24px;\">Dull finish<\/td>\n<td style=\"width: 25%; height: 24px;\">12.50<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 25%; height: 24px;\"><strong>45<\/strong><strong><br \/>\n<\/strong><\/td>\n<td style=\"width: 25%; height: 24px;\">Dry Blast # 24 Oxide<\/td>\n<td style=\"width: 25%; height: 24px;\">Dull finish<\/td>\n<td style=\"width: 25%; height: 24px;\">18.00<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\t<\/div>\r\n<\/div>\r\n<style>\r\n\t.custom-table-block table{\r\n\t\theight: initial!important;\r\n\t}\r\n\t.search-input-wrapper{\r\n\t\tposition: relative;\r\n\t\tmargin-bottom: 24px;\r\n\t}\r\n\t.search-input-wrapper svg{\r\n\t\tposition: absolute;\r\n\t\ttop:50%;\r\n\t\tleft:12px;\r\n\t\ttransform: translateY(-50%);\r\n\t}\r\n\t.table-search-input{\r\n\t\tpadding: 0 0 0 40px;\r\n\t\tborder:1px solid #C1CAD1;\r\n\t\theight: 44px;\r\n\t\twidth: 201px;\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t}\r\n\t.table-search-input::placeholder{\r\n\t\tcolor:#092C47;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\ttext-align: left;\r\n\t\twhite-space:nowrap;\r\n\t}\r\n\t\r\n\t.custom-table-block thead{\r\n\t\tmargin-bottom: 14px;\r\n\t}\r\n\r\n\t.custom-table-block tbody tr:nth-child(odd){\r\n\t\tbackground-color: #F6F9FF;\r\n\t}\r\n\r\n\t.custom-table-block tbody, .custom-table-block thead, .custom-table-block tr, .custom-table-block td, .custom-table-block th{\r\n\t\theight: initial!important;\r\n\t}\r\n\t\r\n\t.custom-table-block tbody td{\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tpadding: 7px;\r\n\t}\r\n\t\r\n\t.custom-table-block thead th{\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 700;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t\tcolor:#092C47;\r\n\t\tposition: relative;\r\n\t}\r\n\t.custom-table-block thead th:after{\r\n\t\tcontent:\"\";\r\n\t\tdisplay: inline-block;\r\n\t\tbackground-image: url(\"data:image\/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http:\/\/www.w3.org\/2000\/svg'%3E%3Cpath d='M10.585 0.585938L6 5.17094L1.415 0.585938L0 2.00094L6 8.00094L12 2.00094L10.585 0.585938Z' fill='%23476175'\/%3E%3C\/svg%3E%0A\");\r\n\t\tmargin-left: 8px;\r\n\t\tbackground-position: center center;\r\n\t\tbackground-size: 12px 7.5px;\r\n\t\tbackground-repeat: no-repeat;\r\n\t\twidth: 24px;\r\n\t\theight: 12px;\r\n\t}\r\n\t.custom-table-block{\r\n\t\tmargin: 20px 0;\t\r\n\t}\r\n\t.custom-table-block .table-wrapper{\r\n\t\twidth: 100%;\r\n\t\toverflow-x: auto;\r\n\t}\r\n\t@media(max-width: 768px){\r\n\t\t\/* .custom-table-block tbody td{\r\n\t\t\twhite-space: nowrap;\r\n\t\t} *\/\r\n\t\t.custom-table-block .table-wrapper{\r\n\t\t\tmax-width: calc(100vw - 16px);\r\n\t\t}\r\n\t}\r\n<\/style>\r\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion\"><strong>Conclusion<\/strong><\/h2>\n\n\n<p>Out of the two categories of injection moulding surface finishes, SPI grade A and B are considered the smoothest with very low surface roughness and are more expensive. Whereas, from a surface roughness point of view, VDI 12, the highest quality VDI, equals SPI C grade.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"1024\" height=\"791\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/IM-Finishes-Handout-EN-1024x791.png\" alt=\"Injection molding finishes handout\" class=\"wp-image-2101\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/IM-Finishes-Handout-EN-1024x791.png 1024w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/IM-Finishes-Handout-EN-300x232.png 300w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/IM-Finishes-Handout-EN-768x593.png 768w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/IM-Finishes-Handout-EN-1536x1187.png 1536w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/IM-Finishes-Handout-EN-2048x1583.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/IM-Finishes-Handout-EN.png\" data-fancybox=\"gallery-11461\" data-caption=\"\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/IM-Finishes-Handout-EN.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><\/figure>\n\n\n\n<p>Xometry offers both SPI and VDI surface finishes for injection moulding parts. Our injection moulding experts at Xometry would be happy to help to further advise you on the possible options. Feel free to upload your design to our quoting engine and we will get you a quote within 48 hours.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><h2 class=\"wp-block-heading\" id=\"get-your-free-injection-moulding-finishes-card\"><strong>Get Your Free Injection Moulding Finishes Card<\/strong><\/h2>\n\n\n<p>This card is moulded in black ABS plastic and depicts twelve SPI finishes from polished to coarse as well as common VDI 3400 surface textures on the back. It is a great tool to keep nearby when working on new injection moulding projects.<\/p>\n\n\n\n<p><em>Delivery only across Europe (<a href=\"https:\/\/www.xometry.com\/injection-molding-finishes-card\/\">For the US request form follow here<\/a>)<\/em>. <em>Only 1 card per client. Only for companies<\/em><\/p>\n\n\n    <div class=\"button-block\" style=\"text-align: left\">\r\n        <a href=\"https:\/\/pages.xometry.eu\/en\/injection-moulding-finishes-card\" target=\"_blank\" class=\"button-block__btn btn_blue\">\r\n                        Get My Free Card                    <\/a>\r\n    <\/div>\r\n\n\n\n<p><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"800\" height=\"671\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/10\/Injection-Moulding-SPI-Finishes-1.png\" alt=\"Injection Moulding SPI Finishes\" class=\"wp-image-11134\" style=\"max-width:343px;height:auto\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/10\/Injection-Moulding-SPI-Finishes-1.png 800w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/10\/Injection-Moulding-SPI-Finishes-1-300x252.png 300w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/10\/Injection-Moulding-SPI-Finishes-1-768x644.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/10\/Injection-Moulding-SPI-Finishes-1.png\" data-fancybox=\"gallery-11461\" data-caption=\"\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/10\/Injection-Moulding-SPI-Finishes-1.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><\/figure>\n<\/div>\n<\/div>\n","protected":false},"author":50,"featured_media":11463,"comment_status":"open","ping_status":"closed","template":"","categories":[],"c-tag-articles":[],"global-tag":[616,592],"class_list":["post-11461","articles","type-articles","status-publish","has-post-thumbnail","hentry","global-tag-injection-moulding-uk","global-tag-post-processing-uk"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Injection Molding Surface Finishes: SPI and VDI | Xometry Pro<\/title>\n<meta name=\"description\" content=\"To increase the appeal of a part, and to improve its functionality, injection moulded parts may require some surface finishing (SPI, VDI).\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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