PURPOSE: To provide the packing material which has excellent resilience, mechanical strength and weatherability, good moldability and excellent flame resistancy and is adequate for window glass.
CONSTITUTION: The flame resistant packing material (glazing channel) is molded by kneading 20 pts.wt. dioctyl phthalate, 30 pts.wt. tricresyl phosphate, 60 pts.wt. calcium carbonate, 15 pts.wt. antimony trioxide, and 3 pts.wt. calcium-zinc composite stabilizer with 100 pts.wt. mixture composed of 50 pts.wt. vinyl chloride/ethylene copolymer having 7wt.% ethylene content and 1400 average degree of polymn. and 50wt.% chlorinated polyethylene having 35wt.% chlorine content. This flame resistant packing material (glazing channel) does not change its shape and its dimensional change is ≤1.2 times in a combustion test (consisting in bringing the material into content with the flame of a Bunsen burner for 10 seconds and parting the material therefrom for 10 seconds, then bringing the material into contact with the flame for 10 seconds). The material blackens and does not generate a spacing between aluminum sash and glass plate in the state of maintaining the molded shape in a practicable use test (consisting in heating the material for 2 hours at 300°C).
TOKAWA SEIJI
NAKAZATO KATSUHIRO
