Silver tungsten foil is a product of rolled silver tungsten （a very thin sheet 0.03-0.09mm in thick）
Silver tungsten foil is extremely heat proof and heat resistant. It has small thermal expansion coefficient, high resistance to thermal creep, good thermal conductivity and electron emission coefficient. Silver tungsten foil is very solid; it has very high tensile modulus and compression. It is resistant to corrosion, the action of alkalis and acids, including concentrated hydrochloric, sulfuric and nitric acids, aqua regain. Physical and chemical quality, biological safety all this makes the silver tungsten foil suitable in various field use.
The main disadvantage of silver tungsten foil is the production cost. Tungsten is a rare metal, it is difficult to isolate in pure form.