Components and insulating sheets of pressboard are used in oil-cooled power transformers and distribution transformers primarily due to their high purity, mechanical strength and optimal oil-impregnability. The components formed of pressboard, such as angle rings, snout segments and end leads, enable an exact adaptation to the electric field conditions prevailing in the ransformer. Flexible Creped paper Tubes – Another major product, made out of insulating kraft paper is flexible crepe paper tube, used in copper conductor connections to save time for building up in insulation..competitive quote in china .