... ., which is 1/310 of that of clay tile, 1/5 of that of cement tile, and 1/2000 of that ... roofing surface. Stable Volume-----The expansion coefficient is 4.93×10-5//,besides it also has a two-way stretch performance on ... , this product is able to ensure for 10-15 years of color change of E≤5. Excellent load-carrying ability-----In cold ...