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Thermoplastic Pipes - Temperature and Strength Derating

Increased temperature derates strength of thermoplastic piping materials

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Thermoplastic materials loose strength to pressure and tension with increasing temperature. The table below can be used as a guide to common thermoplastics and their derated strength with temperature. Manufacturing data should always be consulted.

Derating Factor
TemperaturePVDFCPVCPVCPBPEXPE
(oC)(oF)
21 70 1.0 1.0 1.0 1.0 1.0 1.0
27 80 0.9 1.0 0.9 1.0 0.9 0.9
32 90 0.9 0.9 0.8 0.9 0.9 0.9
38 100 0.8 0.8 0.6 0.9 0.9 0.8
43 110 0.8 0.8 0.5 0.8 0.8 0.8
49 120 0.7 0.7 0.4 0.8 0.8 0.7
54 130 0.7 0.6 0.3 0.7 0.8 0.5
60 140 0.6 0.5 0.2 0.7 0.7 0.4
66 150 0.6 0.5 1) 0.7 0.7 0.2
71 160 0.5 0.4 1) 0.6 0.7 1)
82 180 0.5 0.3 1) 0.5 0.6 1)
93 200 0.4 0.2 1) 0.4 0.5 1)
104 220 0.4 1) 1) 1) 1) 1)
121 250 0.4 1) 1) 1) 1) 1)
138 280 0.3 1) 1) 1) 1) 1)

1) The thermoplastic is not resistant for long term service at this temperature. Operating conditions should be avoided.

  • PVDF - PolyVinylidene Fluoride
  • CPVC - Chlorinated Polyvinyl Chloride
  • PVC - Polyvinyl Chloride
  • PB - Polybutylene
  • PEX - Cross Linked Polyethylene
  • PE - Polyethylene

Plastic Pipes Temperature Derating Diagram

Thermoplastic pipes - temperature and strength and stiffnes diagram

Thermoplastic pipes - temperature and strength and stiffnes diagram

Example - Higher Temperature and Reduced Strength

If the operating pressure for a 6" Schedule 80 CPVC pipe is 167 psi, the maximum operating pressure at 150 oF (66 oC) is reduced to

(167 psi) 0.5

    = 83.5 psi

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