Injection Molding SPI surface finishes Views: 13 Author: Site Editor Publish Time: 2020-01-21 Origin: Site
SPI Mold Finishes
Finish SPI* standard Finishing Method Typical surface roughness Ra (μm) Super High Glossy finish A-1 Grade #3, 6000 Grit Diamond Buff 0.012 to 0.025 High Glossy finish A-2 Grade #6, 3000 Grit Diamond Buff 0.025 to 0.05 Normal Glossy finish A-3 Grade #15, 1200 Grit Diamond Buff 0.05 to 0.10 Fine Semi-glossy finish B-1 600 Grit Paper 0.05 to 0.10 Medium Semi-glossy finish B-2 400 Grit Paper 0.10 to 0.15 Normal Semi-glossy finish B-3 320 Grit Paper 0.28 to 0.32 Fine Matte finish C-1 600 Grit Stone 0.35 to 0.40 Medium Matte finish C-2 400 Grit Stone 0.45 to 0.55 Normal Matte finish C-3 320 Grit Stone 0.63 to 0.70 Satin Textured finish D-1 Dry Blast Glass Bead #11 0.80 to 1.00 Dull Textured finish D-2 Dry Blast #240 Oxide 1.00 to 2.80 Rough Textured finish D-3 Dry Blast #24 Oxide 3.20 to 18.0 As machined - Finished to the machinist's discretion 3.20 (with visible machining marks)
* : SPI (Society of Plastic Industry) standards
