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Q:
 What factor effect the working pressure of PU tubes?
A:  Effecting working pressure of PU tubes, It have follow main reasons:
1. The temperature of environment: Operating temperature is from -20 degree to + 70 degree. The best working temperature is from +5 degree to +40 degree.
2. The raw material: if the PU material mix other material. such as sand, not pure PU material,recycle material or uneven inner suface....all these will effect the working pressure.
3. Wall thickness:The thinner wall thickness, the lower working pressure.