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Benefits of Injection Molded Surface Finishes
Injection Molded Surface Finishes Specification
Specification |
Description |
|---|---|
| SPI A1 – A3 (High‑Gloss) | Precision diamond‑polished mold surfaces; SPI A1 is mirror‑grade flawless, A2–A3 are near‑perfect high‑gloss. Ideal for lenses, display covers, and premium cosmetic housings. |
| SPI B1 – B3 (Semi‑Gloss) | Fine grit polish; smooth, low‑sheen finish with minimal reflection. Balances appearance and ease of manufacturing for general visible parts. |
| SPI C1 – C3 (Matte / Satin) | Stone or fine grit finish; non‑reflective, smooth satin feel. Resists fingerprints and hides minor mold marks; perfect for medical devices and control panels. |
| SPI D1 – D3 (Textured / Blast) | Etched or bead‑blasted surface; uniform matte or subtle stipple texture. Hides wear and defects, improves grip for functional components. |
| VDI 12 – VDI 45 | Standard European texture codes; lower numbers finer/smoother, higher numbers deeper/more pronounced grain. Covers matte, orange peel, and patterned finishes. |
| Custom Grain / Texture | Mold‑etched or laser‑textured patterns including leather, geometric, stipple, or anti‑slip profiles. Matches ergonomic, branding, or functional requirements. |
| As‑Molded | Unmodified surface straight from the tool; retains natural mold finish with minimal processing. Best for internal or cost‑critical functional parts. |
| Pad / Screen Print | Crisp, durable text, logos, or markings applied post‑molding. Precise registration for control panels and branded components. |
| UV / Clear Coat | Transparent protective layer; boosts scratch, chemical, and UV resistance while preserving or enhancing base finish. |
| Metallization / Plating | Vacuum‑deposited chrome, gold, silver, or brushed metal effect; delivers premium metallic look without heavy plating. |
| Soft‑Touch Coating | Rubber‑like, non‑slip, velvet‑feel layer; improves grip and comfort for handheld devices and controls. |
Design & Tooling Considerations For Injection Molded Surface Finishes
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Draft Angles
Smooth/gloss finishes need 0.5°–1° draft. Textured finishes require +1° extra draft per 0.025 mm depth to prevent drag or ejection marks.
Texture Depth
Deeper grains need more draft and may increase tool wear; keep textures uniform across adjacent faces where possible.
Gate & Ejection
Gloss surfaces highlight gate marks and witness lines—position gates on hidden faces or use post‑finishing. Textures help mask these marks.
Material Fit
Amorphous plastics (ABS, PC) hold high‑gloss best; semi‑crystalline materials (PP, POM) suit matte/texture more reliably.
Tolerance Impact
Most finishes add negligible thickness, but heavy coatings or deep texture should be accounted for in critical fit dimensions.
Injection Molded Surface Finishes Materials
We work with a wide range of certified, traceable materials selected to match your performance, regulatory, and application requirements. Our engineers provide DFM guidance to optimize your plastic and metal parts design for manufacturing. Contact us or upload a CAD file for material options, instant quotes, and custom production solutions.
CNC milling services supports a wide range of additional metals, plastics, and composites.
Visit our materials page for a full list.
