|
physical characteristic |
Item |
stainless steel pipe
（304） |
Plastic pipe |
Comparison explanation |
tensile strength（N/mm 2 ） |
≥530 |
≥49 |
Strength of plastic
pipe is only 9.2% of stainless steel. The strength too low is
always the main cause of leaks. |
Abrasion resistance |
high |
low |
Moving liquid is the
main reason of abrasion. |
Ultraviolet radiation |
No aging phenomenon |
Seriously aging |
Plastic pipes aging
seriously in the ray. |
Heat expansion
coefficient
(0-100℃)
(10- 6 /℃) |
17.3 |
70 |
Expansion coefficient
of plastic piping is three times more than stainless steel
piping. Expansion coefficient too high may cause leaks. |
Low temperature
adaption |
≤-270℃ |
temp must higher than
0℃ or brittleness will change. |
Plastic piping
doesn’t fit low temp environment. |
High temperature
adaption |
≥400℃ |
Bad substances
separate out when temp is high. |
Plastic piping isn’t
resistant to high temp and will produce noxious gases when
burning. |
Resistance to corrosion |
fine |
fine |
|
|
environment protection |
Environment hormone |
none |
partly |
Influence people’s
incretion system |
Impurity agglomeration |
hardly |
easy |
Low cleanliness and
density easily make the water smelly. |
hidden troubled water |
none |
partly |
Unidentified recycled
material leads hidden troubled water. |
Bad substance |
none |
release easily |
|
Peculiar smell |
none |
smell bad at high temp |
affect water quality |
Environment protection |
100%green |
can’t be recycled |
Plastic piping can’t
be totally recycled. |
Useful life |
≥100 |
5-20 |
Less than 1/4 of
stainless steel |
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