Physical Properties of CPVC Duct Systems

GF Harvel CPVC Duct systems perform well in many aggressive environments that are not suitable for other types of duct piping material. Due to the unique properties of the material, GF Harvel CPVC Duct maintains high tensile strength and modulus over a wide temperature range, high heat distortion temperature, low thermal conductivity, and excellent chemical resistance to a variety of aggressive substances. Well-balanced physical properties are crucial to ensure the material selected can handle anticipated system requirements. GF Harvel CPVC Duct provides construction advantages due to the material’s light weight, ease of fabrication, and other labor-saving characteristics. When combined with the longevity of a properly designed system, significant cost savings can be recognized. Refer to the table below for physical property details.

CPVC Duct Physical Properties

GENERAL Value Test Method
Cell Classification 23447 ASTM D1784
Maximum Service Temp. 200°F  
Color Medium Gray  
Specific Gravity, (g/ @ 73°F) 1.53 ± 0.02 ASTM D792
Water Absorption % increase 24 hrs @ 25°C 0.03 ASTM D570
Hardness, Rockwell 117 ASTM D785
Poisson's Ratio @ 73°F 0.386  
Hazen-Williams Factor C =150  
Tensile Strength, psi @ 73°F 7,600 ASTM D638
Tensile Modulus of Elasticity, psi @ 73°F 370,000 ASTM D638
Flexural Strength, psi @ 73°F 12,500 ASTM D790
Flexural Modulus, psi @ 73°F 360,000 ASTM D790
Compressive Strength, psi @ 73°F 10,000 ASTM D695
Compressive Modulus, psi @ 73°F 196,000 ASTM D695
Izod Impact, notched, ft-lb/in @ 73°F 2.6 ASTM D256
Coefficient of Linear Expansion (in/in/°F) 3.9 x 10-5 ASTM D696
Coefficient of Thermal Conductivity
3.27 x 10-4
Heat Deflection Temperature Under Load (264psi, Annealed) 228°F ASTM D648
Dielectric Strength, volts/mil 1,250 ASTM D149
Dielectric Constant, 60Hz, 30°F 3.70 ASTM D150
Volume Resistivity, ohm/cm @ 73°F 3.4 x 1015 ASTM D257
Power Factor, 1000Hz 0.007% ASTM D150
GF Harvel CPVC Pipe is non-electrolytic
Flammability Rating V-0, 5VB, 5VA UL-94
Flame Spread Index <10  
Flame Spread <25 ASTM E-84/UL 723
<25 ULC
Smoke Generation ≤50 ASTM E-84/UL 723
<50 ULC
Flash Ignition Temp. 900°F  
Average Time of Burning (sec.) <5 ASTM D635
Average Extent of Burning (mm) <10  
Burning Rate (in/min) Self Extinguishing
Softening Starts (approx.) 295°F  
Material Becomes Viscous 395°F  
Material Carbonizes 450°F  
Limiting Oxygen Index (LOI) 60 ASTM D2863
Clean Room Materials Flammability Test FPI= 1.20   SDI= 0.09 FM 4910
Note: The physical properties shown are considered general CPVC physical properties. GF Harvel utilizes several CPVC compounds for the production different CPVC product lines. Different CPVC compounds may exhibit slight variations in actual physicals properties as compared to those stated. Contact GF Harvel Tech Services for additional information if necessary.