One, observation method
General commonly used warm from the outside can see the raw materials, generally contrast lubrication is not level, bubble, significant color from the impurities, good pipe above type, brand font does not fall off easily.
Two, touch method
This distinction is the same as the water supply PPR pipe. After contact with the pipe on the above there is no groove, edge, and so on, the quality of the pipe feels delicate, lubrication, soft and hard degree of moderate.
Three, can target inspection statement
A simple test of raw material quantity may be carried out with the naked eye, but the function of the target can only be carried out in the laboratory. To check some inspections are of heating pipe happened suspicion time to adopt a way, individual cases to warm the company used in the heating pipe are qualified goods and check statements with warranty book.
Four, pipe wall thickness and flexibility
Warm thick wall demand advisory division, together with the thick wall division, when you can not distinguish between a single tube of the time, you may use two kinds of pipes for comparison, to see which of the wall thickness of a pipe. The good quality of the heating pipe wall thickness is to appeal, and with the same label.
