SPI美国标准
      
        
            
              
              
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- SPI美国标准Description	Roughness Averaging	Comments
3# 钻石膏	0-1	抛光达到镜面或光学要求
grade #3 diamond buff		for mirror or optical finishes
6# 钻石膏	1-2	需要很长时间与成本才能达到此类抛光级别
grade #6 diamond buff		most time consuming and costly finishes to achieve
15# 钻石膏	2-3	对钢料的质量要求很高
grade #15 diamond buff		steel grade important to results (D-M-E No.3 or No.5 steel recommended)
600# 砂纸	2-3	消除所有的加工纹
600 grit paper		removes all tools and machining marks
400# 砂纸	4-5	提供较好的出模
400 grit paper		provides good mold release
320# 砂纸	9-10	在模具上表现为有较暗的反光。
320 grit paper		light reflecting finish on molded part,some sheen
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