Alan's posted something further down on this, and he's done quite a bit of research on it. It would appear that nylon/polyacetal/carbon-fibre is the extent to which you can go.
http://www.karting.co.uk/Notice/Message.asp?FID=1&MsgID=0000379815
By the way, RS are a very old and well respected company - an insititution really. I've used them for 30 years and my father even before that... primarily to buy electronic components. They used to produce telephone directory catalogues which contained fantastic information... I actually found them quite helpful when I did my degree in electronic engineering all those years ago. Let's hope they don't fall victim to the credit crunch. Not an ad, just a comment guys (!)
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