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Valve mfgr. needs to know SPI to Ra relationship

How can we compare the SPI surface finishes to a part surface Roughness Average (Ra)? We realize every situation is different, but is there comparison chart showing the SPI Mold Finishes and how they may equate to a molded part surface finish in microinches?

Mr. Paul S [last name deleted for privacy by Editor]
Valves and Pressure Regulators - Lockport, New York, USA
2003

Ed. note:

March 31, 2008

Hi, Paul. letter 20910 should help. Good luck.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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