WebA polyurethane foam material with a high flame retardant effect is prepared by uniformly mixing, by mass, 40 parts of polyether tetraol, 10 parts of melamine, 40 parts of phthalic anhydride polyester,10 parts of a chain extender, 3 parts of a foam stabilizer, 15 parts of a foaming agent cyclopentane, 20 parts of a composite flame retardant, 2.2 parts of water, … WebPolyurethane foam shall be sprayed in minimum 1/2 inch (12.7 mm) thick passes or lifts. Overall thickness applied in one pass shall be limited to a maximum of 6 inches for JM ocSPF open cell foam to avoid fire hazards resulting from excessive heat generation.
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