PEX is destroyed during install?

Does the oxygen barrier withstand the chaffing it encounters during the install process?
When the HePEX gets kinked and you heat it up with a heat gun the outer layer gets all wrinkley and looks like it has been adversly affected.
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Assuming the stuff is anything like the European pipe, where the oxygen barrier is a thin metallic layer embedded in the pipe, then it doesn't really matter. The oxygen barrier just cuts down the amount of gas in/outflow. You can get pipe without the oxygen barrier at all, so having a hole in the barrier won't have any major bad effect, really.

Personally, I think it is best to chuck it away if it gets kinked. It never really recovers.
Christian.
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