Surface Finish Standards for Electronic Enclosure Molds

The SPI (Society of the Plastics Industry) surface finish standards range from A-1 (super mirror) to D-3 (rough textured). For consumer electronics, A-2 or A-3 finishes are typical for visible surfaces. These require polished steel cavities with no visible tool marks. For matte finishes, bead blasting or EDM textures are used. Texture depths of 0.001-0.003 inches are common for soft-touch surfaces. Yinzan Technology's mold finishing capabilities cover the full SPI range, with CMM verification of surface profiles.