About 67 of these are doors 17 are magnesium oxide boards and 1 are flakeboards.
Perlite fire door core.
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 consists of expanded perlite and inorganic glue.
A wide variety of perlite fire door core options are available to you such as free samples paid samples.
China perlite board find detail steel fire door from zhangjiagang tianyuan machiney manufacturing co ltd.