CLOSED CELL FOAM RUBBER SHEET, LAMINATE, AND WATERPROOF/WATERTIGHT SEALING MATERIAL USING THE SHEET OR LAMIANTE

摘要

Disclosed is a high-performance foam structure which comprises a foam structure having closed cells therein and, when used as a waterproof sealing material or the like, shows excellent interface adhesion to a material to be sealed (i.e., a structural element to be imparted with a waterproof property) even when used for a long period. Also disclosed is a high-performance waterproof/watertight sealing material using the foam structure. A closed cell foam rubber sheet can be produced by subjecting a foaming raw material comprising mainly a rubbery resin to crosslinking treatment or foaming treatment, and has an apparent density of 30 to 100 kg/m3 as measured in accordance with JIS K7222 and a compressive permanent strain of 60% or less as measured in accordance with JIS K6262 under the conditions of 70°C and 24 hours.