circuit board material of the 1960s
 

Alan Douglas wrote in message
...
Probably vulcanized fibre, made of cellulose treated with sulfuric
acid, commonly used for such things as wastebaskets and cheerleaders
megaphones. Fishpaper is also vulcanized fibre but thinner, used for
electrical insulation and is still available. Vulcanized fibre is
very tough, unlike paper-base phenolic which was usually used for
circuit boards.

Alan


So if its vulcanised fibre board and I burnt a sample of it would it have a
rubber smell ? If it was a paxolin type material then the phenolic smell if
burnt would be a pretty sure indicator