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POLYPROPYLENE

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 possesses excellent resistance to organic solvents, degreasing agents and electrolytic attack. It has a lower impact strength, but it's 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 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 gas welded
Spin welded
Fusion & butt welded
Machined with wood or metal working tools
Vacuum formed
Ultra-sonic sealed
Thermo-formed Applications
Chemical resistant tanks & linings
Laboratory consoles, sinks & ducts
Plating barrels & tanks
Lavatory partitions
Filter press plates
Railroad crossing components
Pump components & housings
Prosthetic devices
Die cutting pads
Clean room walls, floors & ceilings
Download Polyproylene datasheet (pdf)
Typical properties of polypropylene

ASTM or UL test Property Unmodified resin

PHYSICAL

D792 Specific gravity 0.905

D792 Specific volume (in.³/lb.) 30.8-30.4

D570 Water absorption, 24 hours, 1/8 inch 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-°C) 2.8

D696 Coefficient of thermal expansion (10~5 in./in.-°F) 3.2-5.7

D648 Deflection temperature (°F)
At 264 psi
At 66 psi
125-140
200-250

UL94 Flammability rating HB

ELECTRICAL

D149 Dielectric strength (V/mil) short time, 1/8-in. 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°F, 50% RH 10~17

D495 Arc resistance(s) 160

Also See Polypro Sheet

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