Surface Finish Options Supported for Injection Molded Plastic Parts

2026,02,10

1: Standard Surface Finish

Most manufacturers typically choose SPI C-1, depending on the geometry and draft angle.

Internal non-decorative surfaces are usually machined.

2: SPI

SPI surface finish is a set of finishing process standards established by the Plastics Industry Association (SPI) to indicate the surface finish of finished parts. Molds can be polished or textured mechanically or manually to enhance performance.

Note: We recommend providing colors, materials, and surface finishes that define the visual and tactile characteristics of the product to ensure design consistency and manufacturing accuracy.

3: VDI

VDI surface finish is another set of mold texture standards set by the German Engineering Association (VDI). Molds can be polished or textured mechanically or manually to enhance performance.

Note: We recommend providing colors, materials, and surface finishes that define the visual and tactile characteristics of the product to ensure design consistency and manufacturing accuracy.

4: Customized - Injection Molding

Surface finish chosen by the mold manufacturer. Typically SPI B-2, depending on the geometry and draft depth. The interior non-decorative surfaces are usually machined.

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