Lixian Qingshan Waterproof Material Co., Ltd. is about 150kilometers to the south of Beijing. Our company has an advantage in geographical position and transportation. Our company covers an area of over 18,000 square meters. We have five sophisticated production lines. Our main products are black building paper and roofing felt which are in conformity with ASTM standards of the USA. The specifications of black building paper are 30 minute paper, 60 minute paper, 90 minute paper and 120 ...