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Yupikamat
Yupika(R) mat is made by incorporating microballoons (hollow microspheres) of polyvinylidene chloride into long fiber non-woven fabric and heating it to foam in the presence of a special binder. It has a very good affinity with unsaturated polyester resin (hereinafter referred to as resin) and contains about 55% volume ratio of resin, showing almost no change in thickness after curing.