Summary for cass chrome plating Discussion
CASS and chrome plating are being confused in the customer request for a "44 hours CASS Chrome finish with #400 grits." Jack Lynn of Metcor Industries asks where to find the specs for the finish. The answer from Q. explains that CASS means copper-accelerated salt spray, so the requirement is not a plating specification itself but an accelerated corrosion test the chrome plating must pass. He points the reader to ASTM B368 for the test method. In other words, the thread clarifies that the customer’s requirement is about corrosion resistance performance under CASS testing, while the #400 grit note relates separately to the surface finish. No alternate specifications or conflicting views are given in the thread.
Hi,
Q. I have a customer specified for 44 hours CASS Chrome finish with #400 grits. Can you let me where can I get the specs for 44 hrs CASS CHROME finish.
JACK LYNN
METCOR INDUSTRIES, INC. – WALNUT, California
2005
A. CASS means copper-accelerated salt spray. So this is not a spec for the plating, but is a spec for the accelerated corrosion testing which the plating must survive. Look into spec ASTM B368.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
2005
A. If you are looking for a chrome plating spec that meets the 44 hours CASS test, try to get General Motors spec GM4374M. it is published with GM4372M and GM4373M. Also ASTM B456, SC 5.
Jim Vickers
– Concordville, Pennsylvania, USA
2005