3M™ Scotch-Weld™ Void Filling Compound EC-3515 B/A FR is a two-part flame-retardant epoxy that can be stored, applied, and cured at room temperature. 3M™ Scotch-Weld™EC-3515 B/A FR has been designed for void filling, edge sealing, and for abradable compound applications. It is available in either blue or black color when mixed and fully cured.