Show whole topic Aug 29, 2021 9:59 am
DavidLG45 Offline
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Registered since: Dec 05, 2007
Location: -


Subject: Re: Battery covers
Hi Laurence,

I think you're right. I was comparing it to a modern hard rubber cased battery which of course would be made from an entirely different material.

I looked up Vulcanite:
In 1839 Charles Goodyear discovered the method of mixing sulphur with rubber to form hardened or vulcanised rubber, called Vulcanite. The proportion of sulphur can be increased or decreased in order to vary the required amount of hardening accordingly. Between 25-50% sulphur gives a hard product with the familiar feel of plastic. . . . Vulcanite could be produced in almost any colour, although the predominant colours are black (ebonite) and brown. . . . Vulcanite is a thermoset material which, after moulding becomes brittle and cannot be remoulded.

I will do some experiments colouring plastic filler. I have some black pigment powder for colouring cement which hopefully will do the job. Soot is hard to come by these days. . . .

David