Our company lies about 150 kilometers to the south of Beijing?It has an advantage in geographical position and transportation.Its occupied area is over18,000 square meters?We own five sophisticated production 1ines?Our main products are black building paper and roofing felt which are in conformity with ASTM standards of U.S.A. The specifications of black building paper are 30 minute paper?60 minute paper?90 minute paper and 120 minute paper?The specifications of roofing felts are ASTM D-226?Type I 15#?Type ?30#?ASTM D-6380?C1ass M?Type ? 90#?ASTM D-4869?Type I 8#(15#)?Type ?13#(30#)?Asphalt Shingles ASTM D-225?Type ? and so on?The quality of all our products are in conformity with or exceeding the standards of ASTM U.S.A. Our company is a leading factory in manufacturing waterproof materials according to the standards of ASTM U.S.A. The annual output of black building paper and roofing felt is 8 million rolls. The output of Asphalt shingles are 20 million square meters annually?