Balaji Cork & Rubber Inc. Manufactures Transformer Rubber Cork Sheet. Balaji Cork & Rubber Inc also manufactures different types of Corks. The Transformer Rubber Cork Sheet is high quality product specially made with clean virgin low density Cork granule blended with Nitrile / Neoprene rubber which provides excellent oil & heat resistance in Distribution & Power transformer. The Transformer Rubber Cork Sheet has good tensile strength and a greater wear and tear resistance. The Transformer Rubber Cork Sheet is available in sizes of 2000 x 1000, 1000 x 1000, 915 x 915, 915 x 615 mm.