news dnv-rp-b401 pressure resistance test of foaming retardant 1027 in deep-sea detector buoyancy material foaming retardant 1027 and dnv-rp-b401 pressure resistance test in buoyant materials of deep sea det... 03/1967DNV-RP-B401 pressure resistance test of foaming retardant 1027 in deep-sea detector buoyancy material