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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 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.
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 |
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 and butt welded, Machined with
wood or metal working tools, Vacuum formed, Ultra-sonic sealed...
Thermo-formed Applications:
Chemical resistant tanks and linings, Laboratory consoles, sinks and
ducts,
Plating barrels and tanks, Lavatory partitions, Filter press plates,
Railroad crossing components, Pump components and housings, Prosthetic
devices,
Die cutting pads, Clean room walls, floors and ceilings...
PP |
Testing
method |
Value |
Basic
property |
density |
Kg/m3 |
ASTMD 1505 |
905 |
|
Melt flowing speed |
g/10 mins |
GB3682 |
29 |
|
Tensile yield strength |
Mpa |
GB1040 |
23 |
|
Elongation |
% |
GB1040 |
50 |
|
Izod impact |
J/m |
ASTMD256 |
65 |
|
hardness |
R |
GB9342 |
85 |
|
Heat distortion temperature |
° C |
ASTMD648 |
105 |
Mainly used for |
High impact resistant refrigerator, washing machine drum and
related fittings. |
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