I read in sci.electronics.design that Keith wrote (in
) about 'Error in textbook?',
on Sat, 14 Aug 2004:

Unfortunately, boiling the CFC also distilled it, leaving any
contamination on the chips.

Sulfur hexafluoride might have been better, but it's probably more
costly than CFCs were.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk