... Situ concrete beams on the roof, board, when the span is more than 4m, the formwork should be in accordance with ... bulking.2. Long service life. It can be used more than 40 times 3. Easy to unload the ... -fee.International marketAt present,Our products are widely used in overseas.for example,America,Eastern Europe,Southeast Asia, ... Arabia and so on. 2011 be widely used in building recyclable pvc formwork