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Chlorinated Polyvinyl Chloride (CPVC, PVC-C)

CPVC is a thermoplastic, further classified as a polyvinyl plastic. It has the lowest heat capacity and a moderately high density among thermoplastics. The graph bars on the material properties cards below compare CPVC to: polyvinyl plastics (top), all thermoplastics (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Compressive (Crushing) Strength

70 MPa 10 x 103 psi

Elastic (Young's, Tensile) Modulus

2.8 GPa 0.41 x 106 psi

Elongation at Break

4.0 %

Flexural Modulus

2.5 GPa 0.36 x 106 psi

Flexural Strength

100 MPa 14 x 103 psi

Impact Strength: Notched Izod

510 J/m 9.6 ft-lb/in

Rockwell R Hardness

120

Tensile Strength: Ultimate (UTS)

50 MPa 7.3 x 103 psi

Thermal Properties

Glass Transition Temperature

100 °C 220 °F

Heat Deflection Temperature At 1.82 MPa (264 psi)

91 °C 200 °F

Maximum Temperature: Autoignition

640 °C 1180 °F

Maximum Temperature: Mechanical

80 °C 180 °F

Specific Heat Capacity

780 J/kg-K 0.19 BTU/lb-°F

Thermal Conductivity

0.31 W/m-K 0.18 BTU/h-ft-°F

Thermal Expansion

65 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz

3.7

Dielectric Strength (Breakdown Potential)

49 kV/mm 1.9 V/mil

Electrical Resistivity Order of Magnitude

13 10x Ω-m

Otherwise Unclassified Properties

Density

1.5 g/cm3 93 lb/ft3

Limiting Oxygen Index (LOI)

57 %

Water Absorption After 24 Hours

0.030 %

Common Calculations

Stiffness to Weight: Axial

1.0 points

Stiffness to Weight: Bending

32 points

Strength to Weight: Axial

9.4 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

0.27 mm2/s

Thermal Shock Resistance

20 points

Followup Questions

Further Reading

ASTM D1784: Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds

Handbook of Vinyl Formulating, 2nd ed., Richard F. Grossman (editor), 2008

ASTM D883: Standard Terminology Relating to Plastics

SPI Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 5th ed., Michael L. Berins (editor), 2000

Modern Plastics Handbook, Charles A. Harper (editor), 1999

Plastics Materials, 7th ed., J. A. Brydson, 1999