Any people try to use cork(from wine bottle for example) for hotend insulator? 

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Any people try to use cork(from wine bottle for example) for hotend insulator?

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I have a feeling this will smoulder quite a bit… just hazarding a guess without looking up facts of course.

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yes cork carbonize with flame…but no find any information how many celsius need for start this process.

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Great link David! Thanks!

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I gave this a go a while back. The cork started to char before the hotend reached it’s target temperature of 200degC. It’s a shame because the thermal properties of cork looked to be quite appealing.

I had more luck with bamboo (http://garyhodgson.com/reprap/2011/05/bamboo-as-alternative-to-peek-or-ptfe/), and still use it today as I find it doesn’t jam as much as PEEK or PTFE.

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If you can compact the cork or bamboo and char the volatile chemicals away then you end up with graphite that can withstand up to 450°C and is a good thermal insulator

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I use cuttlefish bone ( cuttlebone) . Very effective insulator and available at pet shops