| POLYPROPYLENE (Click for Properties & Specs) Back to the Materials Group main page. Polypropylene is an economical material that offers a combination of outstanding physical, chemical, mechanical, thermal and electrical properties not found in any other thermoplastic. Compared to low or high density polyethylene, it has a lower impact strength, but superior working temperature and tensile strength. Polypropylene provides excellent resistance to organic solvents, degreasing agents and electrolytic attack. It has a lower impact strength, but its working temperatures and tensile strength are superior to low or high density polyethylene. It is light in weight, resistant to staining, and has a low moisture absorption rate. This is a tough, heat-resistant, semi-rigid material, ideal for the transfer of hot liquids or gases. It is recommended for vacuum systems and where higher heats and pressures are encountered. It has excellent resistance to acids and alkalines, but poor resistance to aromatic, aliphatic and chlorinated solvents. With polypropylene being lightweight, impact and stress-crack resistant and heat resistant it is an excellent material for fabrication to meet applications requiring high tensile strength, high compressive strength, excellent dielectric properties, stiffness and flex retention, resistance to alkalis and acids and low moisture absorption and stain resistance. |
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| NOTE: All values are average test results from typical production material. No warranty is implied or guaranteed and testing is recommended for each application. |
ASTM or
UL Test Property Homopolymer Co-Polymer Flame Retardant
PHYSICAL
D792 Density (lb/in³) 0.033 0.033 0.035
D792 Density (g/cm³) 0.905 0.897 0.988
D570 Water Absorption, 24 hrs (%) <0.01 0.01 0.02
MECHANICAL
D638 Tensile Strength (psi) 4,800 4,800 4,300
D638 Tensile Modulus (psi) 195,000 - -
D638 Tensile Elongation at Yield (%) 12 23 28
D790 Flexural Strength (psi) 7,000 5,400 -
D790 Flexural Modulus (psi) 180,000 160,000 145,000
D695 Compressive Strength (psi) 7,000 6,000 -
D695 Compressive Modulus (psi) - - -
D785 Hardness, Rockwell R 92 80 -
D256 IZOD Notched Impact (ft-lb/in) 1.9 7.5 0.65
THERMAL
D696 Coefficient of Linear Thermal
Expansion(x 10-5 in./in./°F) 6.2 6.6 -
D648 Heat Deflection Temp (°F / °C)at
66 psi 210/99 173/78 106/41
66 psiat 264 psi 125/52 110/43 57/14
D3418 Melting Temperature (°F / °C) 327/164 327/164 327/164
- Max Operating Temp (°F / °C) 180/82 170/77 180/82
C177 Thermal Conductivity
(BTU-in/ft²-hr-°F) 0.18 -- --
(x 10-4 cal/cm-sec-°C) 0.62 -- --
UL94 Flammability Rating HB n.r. V-O
ELECTRICAL
D149 Dielectric Strength (V/mil)
short time, 1/8" thick 500-660 475 500-650
D150 Dielectric Constant at 1 kHz 2.25 2.2-2.36 2.3
D150 Dissipation Factor at 1 kHz 0.0005-0.0018 0.0017 -
D257 Volume Resistivity (ohm-cm)
at 50% RH 8.5 x 1014 2 x 1016 1015
D495 Arc Resistance (sec) 160 100 -
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