... PDM) 1. Yellow or brown powder N,N'-m-Phenylene Bismaleimide rubber vulcanizator agent HVA-2 (PDM) Specifications ItemsSpecificationsAppearanceYellow or ... brown pwderInitial Melting Point,°C,≥198.0Heat Loss,%,≤0.50Ash,≤,%0.50Residue on 150μm Sieve, max,%,≤0.10 ... HVA-2 is equivalent to rubber crosslinking agent HV268, suitable for general and special rubber vulcanization of rubber, can be sulfur or ...