Physical Properties of PVC Ductwork

GF Harvel PVC Duct systems perform well in many aggressive environments that are not suitable for other types of materials. Due to the unique properties of the PVC material, GF Harvel PVC Duct maintains high tensile strength and modulus over a moderate temperature range, low thermal conductivity, good electrical properties, 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. Appropriate construction practices are determined and applied based on the physical properties of the material selected. GF Harvel PVC Duct provides construction advantages due to the material’s inherent corrosion resistance, 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.

PVC Duct Physical Properties

GENERAL Value Test Method
Cell Classification 12454 ASTM D1784
Maximum Service Temp. 140°F  
Color Dark Gray  
Specific Gravity, (g/cu.cm @ 73°F) 1.40 +/-.02 ASTM D792
Water Absorption % increase 24 hrs @ 25°C 0.05 ASTM D570
Hardness, Rockwell 110 - 120 ASTM D785
Poisson's Ratio @ 73°F 0.410  
Hazen-Williams Factor C =150  
MECHANICAL
Tensile Strength, psi @ 73°F 7,450 ASTM D638
Tensile Modulus of Elasticity, psi @ 73°F 420,000 ASTM D638
Flexural Strength, psi @ 73°F 14,450 ASTM D790
Compressive Strength, psi @ 73°F 9,600 ASTM D695
Izod Impact, notched ft-lb/in @ 73°F 0.75 ASTM D256
THERMAL
Coefficient of Linear Expansion (in/in/°F) 2.9 x 10-5 ASTM D696
Coefficient of Thermal Conductivity
   (Cal.)(cm)/(cm2)(Sec.)(°C)
   BTU/in/hr/ft.2/°F
   Watt/m/°K
3.5 x 10-4
1.02
0.147
ASTM C177
Heat Deflection Temperature Under Load (264psi, annealed) 170 ASTM D648
Specific Heat, Cal./°C/gm 0.25 ASTM D2766
ELECTRICAL
Dielectric Strength, volts/mil 1,413 ASTM D149
Dielectric Constant, 60Hz, 30°F 3.70 ASTM D150
Volume Resistivity, ohm/cm @ 95°C 1.2 x 1012 ASTM D257
GF Harvel PVC Pipe is non-electrolytic
FIRE PERFORMANCE
Flammability Rating V-0 UL-94
Flame Spread Index <10  
Flame Spread 0-25 ULC
Smoke Generation 80-225 ULC
Flash Ignition Temp. 730°F  
Average Time of Burning (sec.) <5 ASTM D635
Average Extent of Burning (mm) <10  
Burning Rate (in/min) Self Extinguishing
Softening Starts (approx.) 250°F  
Material Becomes Viscous 350°F  
Material Carbonizes 425°F