A.Criterion, National standard, GB/T 13663-2000 B. Specification, PE80 Working pressure,0.4MPa,0. Long service life, at least 50 years safely.Favorable Anti-corrosive performance.Smooth inner wall, no fouling, lowest friction.Favorable wear resistance.Favorable toughness, good performance of earthquake resistance.Excellent construction performance and low constructing cost.Doesnt contain the ...