plug assist material

[spock]

One of my thermoforming customers is melting some of their plugs. Material is Hytac B1x. I know that they will not go on forever having me make replacements, they will want to try to change things. I will ask some of the material companys what they recomend, but I know that they are in the business of selling. So if you had plugs that were near where the sheet is coming out (at its hotest) and damaging plugs, what material would you guys recomend?
Question 2: what about alum. for a plug material, since the mold is alum?

[skaklamanos]

THE PERFECT MATERIAL IS SYNTACTIC FOAM

REGARDS