{"id":2903,"date":"2026-08-10T10:35:32","date_gmt":"2026-08-10T02:35:32","guid":{"rendered":"http:\/\/0"},"modified":"2026-08-04T17:53:22","modified_gmt":"2026-08-04T09:53:22","slug":"specs-for-injection-molding-surface-finishing-spi-standards","status":"publish","type":"post","link":"https:\/\/www.jcinjectionmolding.com\/fr\/blog\/specs-for-injection-molding-surface-finishing-spi-standards\/","title":{"rendered":"Specs for Injection Molding Surface Finishing: SPI Standards"},"content":{"rendered":"<article style=\"font-family: -apple-system, BlinkMacSystemFont, &#039;Segoe UI&#039;, Roboto, Helvetica, Arial, sans-serif;color: #333333;width: 100%\">\n<section style=\"margin-bottom: 30px\">\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Am\u00e9liorer l'esth\u00e9tique des pi\u00e8ces plastiques, l'ergonomie tactile et les performances \u00e9lectromagn\u00e9tiques n\u00e9cessite une d\u00e9coration post-moulage compl\u00e8te et un conditionnement de la surface de l'empreinte. Les pi\u00e8ces en plastique moul\u00e9es brutes standard pr\u00e9sentent fr\u00e9quemment des lignes d'\u00e9coulement, des lignes de joint de plan de joint ou des marques d'\u00e9jecteurs qui compromettent la qualit\u00e9 visuelle. L'application de textures de moule sp\u00e9cialis\u00e9es, de polissages miroir au diamant, de rev\u00eatements conducteurs ou d'impression par tampographie multicolore transforme les pi\u00e8ces polym\u00e8res brutes en composants pr\u00eats pour le march\u00e9 de d\u00e9tail. Ce guide technique passe en revue les normes de polissage SPI, la texturation VDI, les m\u00e9thodes d'impression secondaires et les technologies de blindage EMI\/RFI.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2906\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/inspecting-finished-plastic-parts.webp\" alt=\"inspecting-finished-plastic-parts\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/inspecting-finished-plastic-parts.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/inspecting-finished-plastic-parts-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/inspecting-finished-plastic-parts-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/inspecting-finished-plastic-parts-768x429.webp 768w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<\/section>\n<p><!-- Table of Contents --><\/p>\n<section style=\"background-color: #f8f9fa;border-left: 4px solid #0056b3;padding: 24px;border-radius: 6px;margin: 40px 0\">\n<h3 style=\"font-size: 22px;font-weight: bold;line-height: 1.5em;margin-top: 0;margin-bottom: 16px;color: #111111\">Table des mati\u00e8res<\/h3>\n<ul style=\"list-style-type: none;padding-left: 0;margin: 0\">\n<li style=\"margin-bottom: 12px\"><a style=\"color: #0056b3;text-decoration: none;font-size: 17px;font-weight: 500\" href=\"#spi-vdi-finishes\">1. Polissage de moule SPI (finition miroir A-1) et texturation VDI \/ Mold-Tech<\/a><\/li>\n<li style=\"margin-bottom: 12px\"><a style=\"color: #0056b3;text-decoration: none;font-size: 17px;font-weight: 500\" href=\"#secondary-operations\">2. Op\u00e9rations secondaires : tampographie, s\u00e9rigraphie, gravure laser et peinture<\/a><\/li>\n<li style=\"margin-bottom: 0\"><a style=\"color: #0056b3;text-decoration: none;font-size: 17px;font-weight: 500\" href=\"#emi-shielding\">3. Rev\u00eatements de blindage conducteurs EMI\/RFI pour bo\u00eetiers \u00e9lectroniques<\/a><\/li>\n<\/ul>\n<\/section>\n<p><!-- Section 1 --><\/p>\n<section id=\"spi-vdi-finishes\" style=\"margin-bottom: 50px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">Polissage de moule SPI (finition miroir A-1) et texturation VDI \/ Mold-Tech<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2904\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/vdi-mold-cavity-texturing.webp\" alt=\"vdi-mold-cavity-texturing\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/vdi-mold-cavity-texturing.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/vdi-mold-cavity-texturing-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/vdi-mold-cavity-texturing-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/vdi-mold-cavity-texturing-768x429.webp 768w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">La sp\u00e9cification d'une <a href=\"https:\/\/www.jcinjectionmolding.com\/fr\/service\/surface-finishes\/\"><strong>finition de surface professionnelle en moulage par injection<\/strong><\/a> commence lors de la fabrication de l'empreinte du moule. La pr\u00e9paration de la surface de l'empreinte suit les normes internationales de polissage de la Society of the Plastics Industry (SPI). L'obtention d'une <strong>finition miroir SPI A-1<\/strong> n\u00e9cessite un polissage manuel progressif \u00e0 l'aide de p\u00e2tes diamant\u00e9es sur de l'acier tremp\u00e9 <strong>Acier inoxydable S136<\/strong>, \u00e9liminant les micro-rayures pour les lentilles optiques et les <strong>polycarbonate (PC) optique<\/strong> capots haute brillance. L'application d'une <strong>texturation VDI 3400<\/strong> ou en <strong>gravure chimique Mold-Tech<\/strong> imparts controlled matte, leather, or geometric textures directly onto mold cavity faces. Chemical texturing masks flow lines and sink mark shadows while enhancing tactile grip on consumer electronic housings.<\/p>\n<p><!-- Numbered List --><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 16px\">Mold cavity surface finishing standards include:<\/p>\n<ol style=\"font-size: 18px;line-height: 1.8em;margin-bottom: 24px;padding-left: 24px;list-style-type: decimal\">\n<li style=\"margin-bottom: 12px;text-align: left\"><strong>SPI A-1 diamond polishing<\/strong>\u2014Lapping hardened steel with 3-micron diamond paste creates a high-gloss optical mirror surface.<\/li>\n<li style=\"margin-bottom: 12px;text-align: left\"><strong>VDI 3400 spark erosion texturing<\/strong>\u2014Electrical discharge machining produces controlled matte micro-textures ranging from VDI 12 to VDI 36.<\/li>\n<li style=\"margin-bottom: 12px;text-align: left\"><strong>gravure chimique Mold-Tech<\/strong>\u2014Acid etching creates complex leather, woodgrain, or geometric patterns directly on cavity steel.<\/li>\n<li style=\"margin-bottom: 12px;text-align: left\"><strong>Draft angle compensation<\/strong>\u2014Increasing vertical draft by 1\u00b0 for every 0.025 mm of texture depth ensures clean part ejection without scuffing.<\/li>\n<\/ol>\n<\/section>\n<p><!-- Section 2 --><\/p>\n<section id=\"secondary-operations\" style=\"margin-bottom: 50px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">Secondary Ops: Pad Printing, Silk Screening, Laser Engraving &amp; Painting<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2908\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/pad-printing-plastic-housing.webp\" alt=\"pad-printing-plastic-housing\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/pad-printing-plastic-housing.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/pad-printing-plastic-housing-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/pad-printing-plastic-housing-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/pad-printing-plastic-housing-768x429.webp 768w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Secondary post-molding operations add functional symbols, branding logos, and protective coatings to molded <strong>ABS<\/strong> ou en <a href=\"https:\/\/www.jcinjectionmolding.com\/fr\/materials\/abs\/\"><strong>PC\/ABS<\/strong><\/a> parts. Utilizing multi-color <strong>pad printing<\/strong> transfers silicone pad ink onto complex three-dimensional curves and textured surfaces seamlessly. Laser engraving burns away superficial paint coats on backlit buttons, creating precise, light-transmitting symbols. Automated liquid spray painting and UV hard-coat applications improve scratch resistance and chemical immunity on automotive interior trims.<\/p>\n<\/section>\n<p><!-- Section 3 --><\/p>\n<section id=\"emi-shielding\" style=\"margin-bottom: 50px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">Conductive EMI\/RFI Shielding Coatings for Electronic Enclosures<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2905\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/conductive-emi-shielding-coating.webp\" alt=\"conductive-emi-shielding-coating\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/conductive-emi-shielding-coating.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/conductive-emi-shielding-coating-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/conductive-emi-shielding-coating-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/conductive-emi-shielding-coating-768x429.webp 768w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Les bo\u00eetiers \u00e9lectroniques abritant des cartes de circuits imprim\u00e9s sensibles n\u00e9cessitent une protection contre les interf\u00e9rences \u00e9lectromagn\u00e9tiques. L'application de rev\u00eatements conducteurs <strong>Rev\u00eatements de blindage EMI\/RFI<\/strong> \u00e0 l'int\u00e9rieur des bo\u00eetiers en plastique emp\u00eache les signaux radiofr\u00e9quences parasites de perturber l'\u00e9lectronique interne. La peinture par pulv\u00e9risation sp\u00e9cialis\u00e9e utilise des formulations de peinture conductrice au nickel, au cuivre ou \u00e0 l'argent pour former une barri\u00e8re de mise \u00e0 la terre continue. L'obtention d'une faible r\u00e9sistance de surface inf\u00e9rieure \u00e0 0,1 \u03a9\/carr\u00e9 satisfait aux r\u00e9glementations mondiales de compatibilit\u00e9 \u00e9lectromagn\u00e9tique FCC et CE pour les dispositifs m\u00e9dicaux et a\u00e9rospatiaux.<\/p>\n<p><!-- Table 1: Finishing Comparison Table --><\/p>\n<div style=\"margin: 32px 0\">\n<table style=\"width: 100%;border-collapse: collapse;font-size: 16px;text-align: left;min-width: 600px\">\n<thead>\n<tr style=\"background-color: #f8f9fa;border-bottom: 2px solid #dee2e6\">\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">M\u00e9thode de finition de surface<\/th>\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">Rugosit\u00e9 \/ \u00c9paisseur<\/th>\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">Substrat compatible<\/th>\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">Avantage esth\u00e9tique \/ fonctionnel principal<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom: 1px solid #dee2e6\">\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Polissage diamant SPI A-1<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Ra &lt; 0,012 \u03bcm<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">PC, PMMA, r\u00e9sines optiques<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Transparence haute brillance pour lentilles optiques et guides de lumi\u00e8re<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #dee2e6\">\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Texture \u00e0 \u00e9tincelles VDI 24<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Ra = 1,6 \u03bcm<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">ABS, PC\/ABS, PP, PA66<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Finition tactile mate masquant les retassures et les rayures<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #dee2e6\">\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Rev\u00eatement conducteur au nickel<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Film sec de 25 \u2013 50 \u03bcm<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">ABS, PC\/ABS, PBT<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">Blindage EMI\/RFI (&lt; 0,1 \u03a9\/carr\u00e9) pour bo\u00eetiers \u00e9lectroniques<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n<p><!-- FAQ Section --><\/p>\n<section id=\"faq\" style=\"margin-bottom: 40px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">Questions fr\u00e9quemment pos\u00e9es (FAQ)<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2907\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/measuring-surface-roughness-ra.webp\" alt=\"measuring-surface-roughness-ra\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/measuring-surface-roughness-ra.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/measuring-surface-roughness-ra-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/measuring-surface-roughness-ra-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/measuring-surface-roughness-ra-768x429.webp 768w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<div style=\"margin-bottom: 30px\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">Quelle est la diff\u00e9rence entre les finitions de surface SPI A-1 et VDI 24 ?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">SPI A-1 d\u00e9signe une finition miroir optique au diamant polie jusqu'\u00e0 une rugosit\u00e9 de surface Ra inf\u00e9rieure \u00e0 0,012 micron, id\u00e9ale pour les lentilles transparentes. VDI 24 est une texture mate obtenue par \u00e9lectro-\u00e9rosion, produite par usinage par d\u00e9charge \u00e9lectrique, offrant une adh\u00e9rence tactile moyenne qui masque les retassures cosm\u00e9tiques et les d\u00e9fauts de rayures sur les bo\u00eetiers opaques.<\/p>\n<\/div>\n<div style=\"margin-bottom: 30px\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">Pourquoi les cavit\u00e9s de moule textur\u00e9es n\u00e9cessitent-elles des angles de d\u00e9pouille plus importants que les cavit\u00e9s polies ?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Les parois de cavit\u00e9 textur\u00e9es pr\u00e9sentent des pics et des vall\u00e9es microscopiques qui accrochent m\u00e9caniquement le plastique en cours de refroidissement et de r\u00e9traction. Des angles de d\u00e9pouille insuffisants provoquent le frottement de la peau plastique contre l'acier textur\u00e9 lors de l'\u00e9jection, cr\u00e9ant des marques d'abrasion inesth\u00e9tiques. L'ajout de 1\u00b0 de d\u00e9pouille pour chaque 0,025 mm de profondeur de texture assure un d\u00e9moulage fluide sans endommager le motif.<\/p>\n<\/div>\n<div style=\"margin-bottom: 0\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">Comment les rev\u00eatements conducteurs par pulv\u00e9risation assurent-ils le blindage EMI dans les bo\u00eetiers plastiques ?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Les rev\u00eatements conducteurs par pulv\u00e9risation contiennent des paillettes microscopiques de nickel, de cuivre ou d'argent en suspension dans un liant liquide. Lorsqu'ils sont pulv\u00e9ris\u00e9s sur les surfaces internes d'un bo\u00eetier plastique, les particules m\u00e9talliques forment une grille conductrice continue. Cette couche m\u00e9tallique r\u00e9fl\u00e9chit et absorbe le rayonnement \u00e9lectromagn\u00e9tique, emp\u00eachant les bruits haute fr\u00e9quence d'interf\u00e9rer avec les composants \u00e9lectroniques d\u00e9licats.<\/p>\n<\/div>\n<\/section>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>Elevating plastic hardware aesthetics, tactile ergonomics, and electromagnetic performance requires comprehensive post-molding decoration and cavity surface conditioning. Standard raw molded plastic parts frequently display flow lines, parting line seams, or ejection pin marks that compromise visual quality. Applying specialized mold textures, diamond mirror polishes, conductive coatings, or multi-color pad printing transforms bare polymer parts into [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2909,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2903","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/posts\/2903","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/comments?post=2903"}],"version-history":[{"count":0,"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/posts\/2903\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/media\/2909"}],"wp:attachment":[{"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/media?parent=2903"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/categories?post=2903"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/fr\/wp-json\/wp\/v2\/tags?post=2903"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}