Are the rubber insulation materials are refractory materials?

Are the rubber insulation materials are refractory materials?

It's not.

No

Bushi

Compared with the fireproofing properties, the main thermal insulation properties of level B1 will be carbonized and drop when it is over 200 degree.

Reference: It is provided from technicians of Guangzhou Ou Fu construction materials: The answer that has been got: