Fireproof insulating door cores perlite is the perfect filling material for door cores because it is naturally lightweight inorganic insulating non combustible and fireproof giving it a high r value.
Perlite fire door core.
Perlite fire door core consists of expanded perlite and inorganic glue.
Chimney liner due to its non flammable and insulating nature perlite is often used in fire retardant applications such as chimney liners.
About 67 of these are doors 17 are magnesium oxide boards and 1 are flakeboards.
China perlite board find detail steel fire door from zhangjiagang tianyuan machiney manufacturing co ltd.