Whether or not the middle layer of the mask can be ignited is not a criterion for identifying authenticity. In the period of mask tension, if you believe the rumors to try, it will only be a waste of masks. The main material of the mask is polypropylene, polypropylene is a thermoplastic resin made from the polymerization of propylene, the material itself is flammable. The relevant national standards also only on the flammability of the mask provisions, such as medical protective masks national standards: the materials used should not be flammable, should not exceed 5 seconds, no “non-flammable” this requirement.