(1) Materials for Metal Pipes:
Common materials for metal pipes include seamless steel pipes, hot-dip galvanized steel pipes, copper pipes, cast iron pipes, or fiberglass-reinforced plastic (FRP) pipes. For aluminum alloy lined composite pipes, aluminum alloy materials such as 6063 are used. These metal pipes must meet the corresponding national standards, for example, hot-dip galvanized steel pipes should comply with GB/T 3091.
(2) Materials for Plastic Pipes:
The materials for plastic pipes are typically high-strength plastic materials such as high-density polyethylene (HDPE), polypropylene (PP-R), and polyethylene of raised temperature resistance (PE-RT). These plastic pipes must meet their respective material standards, for instance, PP-R pipes should comply with GB/T 18742.2.
