Polypropylene Technical Data and Information
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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 range and higher tensile strength.
Polypropylene possesses excellent resistance to organic solvents, degreasing agents and electrolytic attack. 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 alkalies, but poor aromatic, aliphatic and chlorinated solvent resistance.
Features:
Lightweight, High tensile strength, Impact resistant, High compressive
strength, Excellent dielectric properties, Resists most alkalis and acids,
Resists stress cracking, Retains stiffness and flex, Low moisture
absorption, Non-toxic, Non-staining, Easily fabricated, High heat
resistance.
Fabrication:
Polypropylene can be easily fabricated using the following techniques:
Hot air welded, spin welded, fusion and butt welded, machined with wood
or metal working tools, vacuum formed, ultra-sonic welded.
Applications:
Chemical resistant tanks and linings, laboratory consoles, sinks and ducts, plating barrels
and tanks, die cutting pads, clean room walls, floors
and ceilings.
Typical properties of Polypropylene
ASTM |
Property |
Value |
Physical |
||
| D792 | Specific gravity | 0.905 |
| D792 | Specific volume (in.³/lb.) | 30.8-30.4 |
| D570 | Water absorption, 24 hours, 3.0 mm thick (%) | 0.01-0.03 |
Mechanical |
||
| D638 | Tensile strength (psi) | 5,000 |
| D638 | Elongation (%) | 10-20 |
| D638 | Tensile modulus (10~5 psi) | 1.6 |
| D790 | Flexural modulus (10~5 psi) | 1.7-2.5 |
| D256 | Impact strength, izod (ft-lb/in. of notch) | 0.5-2.2 |
| D785 | Hardness, Rockwell R | 80-110 |
Thermal |
||
| C177 | Thermal conductivity (10~4 cal-cm/sec-cm~2-°) | 2.8 |
| D696 | Coefficient of thermal expansion (10~5 in./in.-°) | 3.2-5.7 |
| D648 | Deflection temperature (°) At 264 psi | 125-140 |
| D648 | Deflection temperature (°) At 66 psi | 200-250 |
| UL94 | Flammability rating | HB |
Electrical |
||
| D149 | Dielectric strength (V/mil) short time, 3mm thick | 500-660 |
| D150 | Dielectric constant At 1kHz | 2.2-2.6 |
| D150 | Dissipation factor At 1kHz | 0.0005-0.0018 |
| D257 | Volume resistivity (ohm-cm) At 73°, 50% RH | 10~17 |
| D495 | Arc resistance | 160 |
These values are representative of those obtained under standard ASTM conditions and should not be used to design parts which function under different conditions.
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