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SPI* Finish Polishing Method Comments
A1 Grade #3 diamond paste Mostly used for lenses, optics and high gloss cosmetic parts. This finish is difficult to achieve and will add significant cost to the tooling and part costs (due to higher scrap rates and processing time).
A2 Grade #6 diamond paste This is a more commonly used finish compared to A1 for high gloss cosmetic parts.
A3 Grade #12 diamond paste For products requiring a polished although not a high gloss cosmetic appearance.
B1 600 grit sand paper For products requiring a slight reflective although not high cosmetic appearance. This finish is suitable for parts requiring painting or plating. Close to an A3 finish with a directional pattern.
B2 400 grit sand paper For non-visual surfaces. Deeper directional pattern to the B1 finish.
B3 320 grit sand paper For non-visual surfaces. Deeper directional pattern to the B2 finish.
B4 240 grit sand paper For non-visual surfaces. Deeper directional pattern to the B3 finish. Used after stone finishing.
B5 180 grit sand paper For non-visual surfaces. Deeper directional pattern to the B4 finish. Used after stone finishing.
C1 600 stone finish Smooth finish for small areas that are difficult to polish by sand paper.
C2 400 stone finish Mainly used for the removal of machine cutter marks.
C3 320 stone finish Mainly used for the removal of machine cutter marks with deeper finish than a 400 stone.
C4 220 stone finish Mainly used for the removal of machine cutter marks with deeper finish than a 320 stone.
C5 150 stone finish Mainly used for the removal of very rough machine cutter marks with deeper finish than a 220 stone.
D1 #11 glass bead blast Produces a random fine satin or de-glossed type of finish.
D2 #240 Aluminium oxide blast Produces a random fine satin or de-glossed type of finish (deeper texture to the #11 finish)
D3 #24 Aluminium oxide blast Produces a random fine satin or de-glossed type of finish (deeper texture to the #240 finish)
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