Summary for w3700 optical paint Discussion
W3700 optical paint is the focus of this thread, and Dennis Chan asks whether the formula was recently changed to contain lead after six months of outgassing problems in instruments. Fred Alvarez of Eastern Chem-Lac replies that the W3700 formula has not changed and does not contain any lead. He says the more likely cause is an under-cured paint film, often from incorrect oven settings or insufficient bake time. His guidance is to verify that the parts actually reach substrate temperature before timing the cure, and to remember that W3700 requires a minimum 30-minute cure at a minimum of 325 °F. He also notes that when many parts are baked at once, the time may need to be extended to achieve proper cure temperatures. The rest of the page contains unrelated RFQs about other Eastern Chem-Lac products and a note that the correct company name is Eastern Chem-Lac.
Q. Dear Eastern Chem-Lac Optical Paint # W3700 Users:
We use this formulation of the optical paint in our instruments. During the last 6 month usage, we are experiencing some outgassing which is degrading the performance of the instruments. My question is: Has the formulation been changed recently to lead?
Dennis Chan
– Sunnyvale, California, United States Of America
2003
A. Dennis Chan,
W3700 formula has not changed nor does it contain any lead. Generally when outgassing is encountered it is due to an under-cured paint film. This may be due to incorrect oven settings and/or not enough time in the oven to ensure a complete cure.
W3700 requires a cure process of 30 minutes (minimum) @ 325 °F (minimum). Note, this is substrate temperature and dwell time. Check oven temperatures and times to ensure that the parts are reaching the proper temperatures prior to beginning the 30 minutes. When baking many parts, baking times may have to be extended in order to achieve proper cure temperatures.
Fred Alvarez
Eastern Chem Lac Corporation – Malden, Massachusetts
2003
RFQ: We have been asked to paint a new product using “Eastern Chemlac X2569” supplier Croft Corp. If anyone can help me find either the manufacturer or supplier for this paint that would be really helpful!
Phil Eagleton
instrumentation – Crewe, Cheshire, UK
2003
Ed. note: This RFQ is outdated, but technical replies are welcome, and readers are encouraged to post their own RFQs. But no public commercial suggestions please ( huh? why?).
RFQ: We have been asked for finish with Eastern Chemlac W7984 smooth finish. Please inform us about who is the supplier.
Thanks & Regards
Subramani Raju
Machining/plating shop – Bangalore, Karnataka, India
2004
Ed. note: This RFQ is outdated, but technical replies are welcome, and readers are encouraged to post their own RFQs. But no public commercial suggestions please ( huh? why?).
RFQ: Have you heard of Eastern Chemlac? I need to buy a paint from these guys, and cannot find any info on them. Can you help me please. Thanks
Brian Polla
– Mississauga, Ontario, Canada
2005
Ed. note: This RFQ is outdated, but technical replies are welcome, and readers are encouraged to post their own RFQs. But no public commercial suggestions please ( huh? why?).
Ed. note: It’s actually “Eastern Chem-Lac” that you folks are interested in. Put that term in your search engine, quotes and all, and you’ll get there.