Besides the innumerable transparent or patterned sheet materials, polyvinyl acetate resins (PVC) are coated on a variety of base materials, wool (Yana), cotton twill and jersey fabric (Lionide, Ambla, Flexknit, etc.), to yield light-, medium- and heavyweight cloths which have all the advantages of true plastics, i. e. long flex life without ageing, resistance to spilt acids, stains and greases, water resistance, etc. Some are produced as impregnated woven fabrics for upholstery, etc.. similar in all respects to natural woven materials, while others are close coated and grained in so exact a simulation of natural leather that it is sometimes difficult to tell the difference unless the edges are examined. These have a rapidly expanding use in wall coverings, spring and foam-covered seating, etc., with the added advantages of cheapness and continuous widths free from all defects, although they lack the beauty of the natural material, and have not the same recovery value under seating pressure as good leather.
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