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>From OTA@S1-A Thu Oct 22 04:23:17 1981

SPACE Digest                                      Volume 2 : Issue 18

Today's Topics:
			   carbonless plastics
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From: CARLF@MIT-AI
Date: 10/21/81 11:49:46
Subject: carbonless plastics

CARLF@MIT-AI 10/21/81 11:49:46 Re: carbonless plastics
To: SPACE at MIT-MC
	The polymerized sand you ask about is glass. The silicones
consist of a backbone of alternating Si and O, with two hydrocarbon
side groups coming off of each Si.  CH3 is a typical side group. They
can indeed stand high temperatures, up to several hundred degrees
centigrade. Silicones can indeed be made with a very low fraction of
volatile component; grease used in vacuum systems is silicone.
Silicone is also reasonably invulnerable to ultraviolet. The problem
with it is that it isn't very strong stuff. I've never heard of
anything more solid than rubber being made from silicone. What
prompts you to this query about carbonless plastics?  If you really
want to know, I can tell you quite a bit.

							-- Carl      

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End of SPACE Digest
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