... 5 but pressure drainage, aging resistance, long life, general and simple, reliable, connected not anticorrosive processing, construction speed is ... vice polyethylene (HDPE) by department of health inspection and materials, non-toxic, allowing use can be recycled,2 ... density polyethylene pipe [scope. :1 high-rise residential and life wastewater and sewage drainage (corrupt) system,2 Bridges, highway ...