Letter 11098

Standards for certain laboratory testings

Dear sir/madam:

We are a company doing electroplating on ABS plastic with the process of copper, nickel and chrome plating. I would like to know about the standards for certain laboratory testings which are:

1.normal salt spray test.
2.copper accelerated salt spray test(cass)
3.acetic accelerated salt spray test(ass)

Please tell me about the standards which are; temp.; salt sol conc. and ph. Also tell me how much a slight difference in these standards, can affect the results. Please write to me soon.

Thanx and regards

Sandeep Jain
Jain Plastic Corporation. - New Delhi

The answers to all of your questions should be found in ASTM B-117 [link is to spec at TechStreet] and ASTM B-368 [link is to spec at TechStreet]. ASTM B117 is the specification for salt spray. ASTM B368 is the specification for the CASS test. CASS testing uses both copper and acetic acid, and I do not think there is a standard test that uses only copper or only acetic acid. CASS testing is appropriate for specific finishes only. We use CASS to test our nickel-chrome platings. Salt spray is the most universally accepted corrosion test method, and is the "default" test.

Tim Neveau
- Rochester Hills, MI

You may also want to refer to ASTM G85 [link is to spec at TechStreet], which includes an acetic acid salt spray. ISO 9227 [link is to spec at TechStreet] includes procedures for salt spray, cass and acetic acid.

Cynthia L. Meade National Exposure Testing Sylvania, OH, USA

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