Foil backed bubble wrap

I've placed foil backed bubble wrap under my heat bed, between the bed and the frame with a layer of aluminium foil just in case the insulation melts. I have a prusa i3 rework with mk3 heated bed. It really helps keep the bed hot once it's up to temperature and get it there more quickly but does anyone know how hot that stuff can go? It hasn't melted yet at 115 deg C.

Bubble foil is usually LDPE, which, according to wikipedia, is good for 80c in the long run

Edited 1 time(s). Last edit at 07/27/2015 02:15AM by Srek.

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[www.bonkers.de]
[merlin-hotend.de]
[www.hackerspace-ffm.de]

Anyone tried mylar, ceramic or other hight temp insulator sheets for the bed?