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This product is processed by making the paper base soaked in lowsoftening perroleum asphalt,then covered with high-softening petroleum asphalt,and last coated with isolating materials such as talk powder.It is widely applied to the simple waterproofing,temporary-building waterproofing,building dampproofing,packing;as well as the single,multi-layers waterproofing of building roofs,underground facilities,water conservancy projects,etc.
