Injection Molding SPI surface finishes

Views: 13     Author: Site Editor     Publish Time: 2020-01-21      Origin: Site

SPI Mold Finishes

FinishSPI* standardFinishing   MethodTypical surface   roughness Ra (μm)
Super High   Glossy finishA-1Grade #3, 6000 Grit   Diamond Buff0.012 to 0.025
High Glossy   finishA-2Grade #6, 3000 Grit   Diamond Buff0.025 to 0.05
Normal Glossy   finishA-3Grade #15, 1200 Grit   Diamond Buff0.05 to 0.10
Fine   Semi-glossy finishB-1600 Grit Paper0.05 to 0.10
Medium   Semi-glossy finishB-2400 Grit Paper0.10 to 0.15
Normal   Semi-glossy finishB-3320 Grit Paper0.28 to 0.32
Fine Matte   finishC-1600 Grit Stone0.35 to 0.40
Medium Matte   finishC-2400 Grit Stone0.45 to 0.55
Normal Matte   finishC-3320 Grit Stone0.63 to 0.70
Satin Textured   finishD-1Dry Blast Glass Bead   #110.80 to 1.00
Dull Textured   finishD-2Dry Blast #240 Oxide1.00 to 2.80
Rough Textured   finishD-3Dry Blast #24 Oxide3.20 to 18.0
As machined-Finished to the   machinist's discretion3.20 (with visible   machining marks)

* : SPI (Society of Plastic Industry) standards

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