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S.pi. official s.pe. mold finish comparison kit
For Sale: S.pi. official s.pe. mold finish comparison kit
Subject S.pi. official s.pe. mold finish comparison kit
Ad is submitted by poster:
In 1962, the Moldmaking Divs. of the Society of Plastics Engineers (SPE) and the Society of the Plastics Industry (SPI) cooperated in establishing mold finish standards for the injection molding industry. This standard specified six finishes, ranging from a high diamond polish to a rough, blasted surface. This standard was controlled by a set of six steel disks containing each of the six finishes.
The surface finish standards on molds is often specified by the SPI-SPE Mold Finish Comparison Kit. It consists of six steel disks polished to different levels. The polishing technique employed to obtain the six different mold finishes, and the surface roughness measured in RMS microinches are shown in Table 1.
1 #3 Diamond Polish 0.5 to 1.0
2 #15 Diamond Polish 1.0 to 2.0
3 320 Grit Abrasive Cloth 7.0 to 7.5
4 280 Grit Abrasive Cloth 12.0 to 15.0
5 240 Grit, Dry Blast (5 inch distance @ 100 psi) 26.0 to 32.0
6 24 Grit, Dry Blast (3 inch distance @ 100 psi) 160.0 to 190.0
The SPI-SPE Mold Finish Comparison Kit
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Posted By: Lee Hicks
Contact: L.Hicks@repair--parts.com (Lee Hicks) (this is a temporary forwarding address).
