Melts at just under 400C. I've had a baffle glued in the original with Araldite and that never melted and a silicon extension, so I think we're good.
Probably not good for 4 stroke petrol headers or mufflers though
Which bit melted on the 65cc? I can imagine a header pipe to a remote muffler gets hotter than a muffler bolted to the head [sm=confused.gif]