Where to purchase fireproof gasket material for gunsafe door?

Question:I want to fireproof my safe and I don't know where to get the fireproof expandable gasket material for around the door.

Answers:
Contact your local heating and a/c company you will want to find one that does boiler repairs and installs they will have a gasket material that is used on boiler firebox doors you should be able to use this material.