SMLease Design

Mechanical Product Design & Development Partner

Blog posts : "injection mould finish"

SPI Mould Finish

SPI (Society of Plastic Industry) establish standards for plastic industry and the SPI plastic engineering handbooks is one of the most important reference for engineers.

SPI defines the polishing standard on mold finish. It helps to avoid grey areas and measure the finest of surface in the unit of Rough Average (Ra).

nowadays, china’s standard is very much in line with SPI. However, there is little help using Ra value in china mold making industry because there is little chance to have precise equipment at site to do the precision measurement.

 If you need any help related to plastic part design, contact us at

Glossy Surface, Diamond Buff Polish

SPI Finish A-1 — Grade #3, 6000 grit diamond buff

SPI Finish A-2 — Grade #6, 3000 grit diamond b…

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