SPI mold finish guide, SPI surface finish chart
- SPI mold finish guide
- SPI surface finish chart
- SPI mold finish standards
- Injection mold texture standards
- Plastic part surface finish specifications
- Plastic surface finish standards
- Plastic surface finish chart
- Plastic Injection Molded Parts Surface Finishes
- Mold surface roughness
- Mold texture specification
- Specifying plastic finish
- EDM finish plastic
- EDM surface finish chart
- Spark finish plastic
- Vdi surface finish chart
The Society of the Plastics Industry, or SPI, establishes standards for the United States plastics industry. Among the SPI standards is one defining the degree of polish on the inner surfaces of the molds used to form plastic products. The SPI standards specify 12 grades of mold finish ranging from mirror-perfect to dull. Various companies offer illustrative sample kits consisting of steel discs or strips polished to the different SPI grades.