PRESSURE-RESISTANT FOAM FLOAT AND METHOD FOR PRODUCING THE SAME

摘要

An apparatus and method is described providing a pressure-resistant foam float for a LPG gas, which can withstand a high pressure of 50 kg/cm<2> or more, and its manufacturing method. The foam float has a specific gravity below about 0.4 and is characterized by the fact that a mixture powder comprised of 39-46 wt % phenol resin, 30-40 wt % carbon black, 3.5-5 wt % zinc oxide, 1.0-1.5 wt % stearic acid, 35-43 wt % sulfur, 6.0-7.0 wt % azodicarbonamide (AC), 3.5-4.5 wt % foaming acid, 0.5-1.0 wt % L-7, and 1.5-2.0 wt % CZ is put in a range of 120-150 parts by weight into NBR at 100 parts by weight.