[typhoon2028]

bad mistake, definitely misread that one

wow, feeling mighty dumb

[miker]

bad mistake, definitely misread that one

wow, feeling mighty dumb

I can't understand what you mean
It's bad to try this acid?

[vmelkon]

Heat doesn't soften silicone. It decomposes and burns of you heat it enough and you end up with a white powder (probably SiO2).
I once put it in contact with gasoline. Doesn't do anything but it came off the glass. (Silicone sticks very well to glass).

[cil-baha]

Silicone is a thermosetting plastic made by a chemical reaction, the acetic acid mentioned above is part of the 'curing' process and will not redissolve silicone; silicone will not melt with heat, it will decompose usually with charring.
You need to buy a new mask, or if you  think you're onto something you can try dissolving with acetone, Tetrahydrofuran THF, benzene, petroleum ether, toluene, dichloromethane, acetonitrile or any organic solvent you think will work -  try inorganic caustic soda and muriatic acid as well (separately, of course). 
Let us know how far your achievements proceed with results - we want to know.