Surface Finishing Chart

Enhance the appearance and functionality of your injection-molded parts with optimized mold surface finishes. From glossy to matte or textured, our tailored finishes ensure your parts meet exact specifications.
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Jiangzhi offers various types of injection molding finishes. Normally, our plastic surface finishing is based on SPI or VDI standards for molded parts. Finishes applied to the surface of the mold cavity transfer to the surface of the molded part. Adding a finish may change the mold price, but won’t influence the unit price. Choose the correct surface based on your own budget.

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SPI Surface Finishes Chart

SPI refers to Social Plastic Industry, which set a standard of mold finishes from high polishing to texture. The usage and material of injection parts, the structurer and raw mateiral of the mold, as well as the treatment method, all of these aspect will effect eh injection molded parts roughness, brightness, flatness, etc.

SPI mold finishes standard chart

Finish Description Description
A-1 Grade #3 diamond buff for mirror or optical finishes
A-2 Grade #6 diamond buff most time consuming and costly finishes to achieve
A-3 Grade #15 diamond buff steel grade important to results
B-1 600# grit paper removes all tools and machining marks
B-2 400# grit paper provides good mold release
B-3 320# grit paper ligh reflecting finish on molded parts, some sheen
C-1 600 stone removes all tools and machining marks
C-2 400 stone provides good mold release
C-3 320 stone mute finish on molded parts, no sheen
D-1 dry blast glass bead for decorative finishes
D-2 dry blast #240 oxide helos hide shrink mardks and other imperfections
D-3 dry blast #24 oxide dull non-reflecting finish on molded parts
injection moulding spi surface finishing

VDI 3400 Surface Finishing

VDI 3400 Surface Finish refers to the texture standard Verein Deutscher Ingenieure, the Society of German Engineers. VDI has set a standard of mold cavity surface for Europe market or even the whole world. The VDI 3400 is mainly processed by EDM while machining the mold. VDI consist of different electric spark particle in size, depth and density.

Common VDI 3400 finish chart

VDI-3400-texture
VDI VALUE Description COMMENTS
VDI 12 600 stone low polish
VDI 15 400 stone low polish
VDI 18 dry blast glass bead satin finish
VDI 21 dry blast #240 oxide dull finish
VDI 24 dry blast #240 oxide dull finish
VDI 27 dry blast #24 oxide dull finish
VDI 30 dry blast #24 oxide dull finish
VDI 33 dry blast #24 oxide dull finish
VDI 36 dry blast #24 oxide dull finish

SPI vs. VDI 3400

A brief comparison between SPI standard and VDI standard

plastic surface finish chart

Custom Parts Surface Finishing Case

High Gloss

SPI A

High Gloss Finishing Part

Diamond - polished mirror finish for clear or premium parts.
Semi-Gloss finishing

SPI B

Semi-Gloss Finishing Part

Fine-polished smooth surface with controlled shine.
matte finishing

SPI C

Matte Finishing Part

Non-reflective sanded finish for uniform, low-glare parts.
Textured

SPI D

Textured Finishing Part

Grit-blasted surface for grip, coverage, and defect masking.

Custom Contract Manufacturing Capability

Jiangzhi offers custom contract manufacturing to provide precise solutions for your business needs. Utilizing advanced technology and a flexible approach, we deliver high-quality, cost-effective production. For low or high volume, we partner with you to ensure products meet all specifications and are delivered on time.
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Injection Molding Finishes FAQs

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Repairs are possible but limited. Textures can be deepened but not easily lightened, and polishing may remove material. We verify finishes during sampling to minimize irreversible rework.
Slight variations may occur in deep cavities, corners, or core-pulled areas, but our optimized design and sampling ensure consistent final surfaces.
Our reinforced mold surfaces can withstand up to 50,000–100,000 cycles, depending on part complexity and maintenance.
No, our mold pricing is fully transparent. All surface treatments, texturing, polishing, and other additional processes are clearly listed in the quotation, there are absolutely no hidden costs.

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