Plastic pipe inside and outside the main features: A, ● external plastic pipe mechanical properties: Tensile strength 275-320MPa, is pure plastic tube 7-8 times. B, ● plastic pipe inside and outside the thermal conductivity :0.46-0 .57 (W / mk), has good thermal insulation properties, about steel, 1/100, but several times higher than the insulation material, close to the thermal conductivity of plastic pipe . C, ● plastic pipe inside and outside the linear expansion coefficient: 1.2 × 10 -5 /. C, which is pure plastic pipe, 1/10 - 1/12. D, ● plastic pipe inside and outside the hydraulic performance: plastic composite pressure pipe wall roughness is smooth wall, transmission fluid, the resistance loss, scaling ● plastic pipe inside and outside of the structure set rigid in one, can quickly eliminate pipeline impact pressure within the system, do not produce water hammer noise. E, ● external plastic pipe corrosion resistance: PE material at room temperature insoluble in any known deep agents, plastic composite pipe inside and outside the inner and outer layer of polyethylene ● plastic pipe is a non-polar materials, chemical stability. At room temperature, insoluble polyvinyl any known solvent, the ability of various acids, bases, salt solutions corrosion. F, ● plastic pipe inside and outside the health properties: non-toxic health products meet GB17219 standards, and has been the "Hebei Province Health Department health and safety of drinking water product license document" approval number: Ji Wei word water (2002) S056 No. ● outside plastic pipe can be used for drinking water transport. 15610819003