To the readers: My February 2004 column contained a question and answer regarding passivating to a standard QQ-P-35 (www.pfonline.com/articles/clinics/0204cl_clean2.html). The information below was in response to that column and provides additional background and insight.
Question:
We are a contract manufacturing company in the process of looking for a supplier in the Northeast that provides the service of cleaning aluminum and brass machine parts to a CGA spec, CGA G-4.1.