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Unplasticized (Rigid) Polyvinyl Chloride (uPVC, PVC-U)

UPVC is a thermoplastic, further classified as a polyvinyl plastic. It has a moderately low heat capacity among thermoplastics. In addition, it has a moderately high ductility and a moderately low tensile strength. The graph bars on the material properties cards below compare uPVC 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

Elastic (Young's, Tensile) Modulus

3.7 GPa 0.54 x 106 psi

Elongation at Break

58 %

Flexural Modulus

3.5 GPa 0.51 x 106 psi

Flexural Strength

80 MPa 12 x 103 psi

Impact Strength: Notched Izod

360 J/m 6.8 ft-lb/in

Tensile Strength: Ultimate (UTS)

47 MPa 6.7 x 103 psi

Thermal Properties

Glass Transition Temperature

85 °C 190 °F

Heat Deflection Temperature At 1.82 MPa (264 psi)

69 °C 160 °F

Heat Deflection Temperature At 455 kPa (66 psi)

90 °C 190 °F

Maximum Temperature: Autoignition

400 °C 740 °F

Maximum Temperature: Decomposition

270 °C 520 °F

Maximum Temperature: Mechanical

95 °C 200 °F

Melting Onset (Solidus)

180 °C 350 °F

Specific Heat Capacity

880 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

0.16 W/m-K 0.093 BTU/h-ft-°F

Thermal Expansion

61 µm/m-K

Vicat Softening Temperature

83 °C 180 °F

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz


Dielectric Strength (Breakdown Potential)

19 kV/mm 0.74 V/mil

Electrical Dissipation At 1 Hz


Electrical Resistivity Order of Magnitude

15 10x Ω-m

Otherwise Unclassified Properties


1.4 g/cm3 88 lb/ft3

Limiting Oxygen Index (LOI)

42 %

Water Absorption After 24 Hours

0.24 %

Common Calculations

Stiffness to Weight: Axial

1.5 points

Stiffness to Weight: Bending

37 points

Strength to Weight: Axial

9.1 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

0.13 mm2/s

Thermal Shock Resistance

15 points

Followup Questions

Further Reading

ISO 1163: Plastics - Unplasticized Poly(Vinyl Chloride) (PVC-U) Moulding and Extrusion Materials

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015