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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Has The Formula For W3700 Optical Paint Changed

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 note: Sorry, this RFQ is old & outdated, so contact info is no longer available. However, if you feel that something technical should be said in reply, please post it; 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

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: 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.

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