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Polypropylene (PP), also known as polypropene, is a chemically created, petroleum based thermoplastic polymer that is used worldwide for a variety of applications where a lightweight, air-tight material is required. Uses for polypropylene include packaging, textiles, automotive parts, reusable containers, laboratory equipment and other plastic materials. Industrial uses for polypropylene most commonly involves injection molding where molten polypropylene is pressed into assorted shapes such as bottles, bottle tops and fittings. Polyhedron Laboratories can perform a variety of polypropylene tests to ASTM standards, from polypropylene compressive strength to polypropylene yield strength and more.
Polypropylene copolymer (PPC) is a softer, more flexible plastic, which also tends to have more stress-crack resistance and has greater impact strength. Copolymer polypropylene tends to have greater low-temperature endurance with only modest compromises over basic polypropylene properties.
See typical properties of polypropylene listed below.
PROPERTIES | ASTM TEST METHOD | HOMOPOLYMER | COPOLYMER |
---|---|---|---|
Melt flow (g/10 min) |
D1238 |
0.25-100 |
0.3-66 |
Melting temperature, °C |
|
147-230 |
157-168 |
Processing temperature range, °C Injection |
|
93-288 |
196-301 |
Extrusion |
|
382-260 |
|
Molding pressure range, 103 psi |
|
1-20 |
0.7-25 |
Tensile strength at break, psi |
D638 |
2500-7180 |
1740-4930 |
Elongation at break, % |
D638 |
2-605 |
5-700 |
Tensile yield strength, psi |
D638 |
3500-6100 |
1430-530 |
Compressive strength (rupture or yield) psi |
D695 |
6000-6800 |
3500-5500 |
Flexural strength (rupture or yield) psi |
D790 |
3480-8210 |
1400-5500 |
Tensile modulus, 103 psi |
D638 |
10-360 |
64-240 |
Compressive modulus, 103 psi |
D695 |
|
|
Flexural modulus, 103psi 23°C |
D790 |
120-380 |
110-215 |
Izod Impact, ft·lb/in of notch |
D256A |
0.04-2.3 |
0.3-16 |
Hardness - Rockwell |
D785 |
M80-115 |
M45-55, R58-115 |
Shore |
D2240 |
Shore A42-100 |
Shore A66-94 |
Coef.of linear thermal expansion, |
D696 |
37-100 |
-343-278 |
Deflection temperature 264 psi |
D648 |
46-113 |
82-230 |
66 psi |
D648 |
71-132 |
43-135 |
Specific gravity |
D792 |
0.8-1.25 |
0.86-1.33 |
Water Absorption, 24 hrs. |
D570 |
0.008-0.04 |
0.01-0.03 |
Dielectric strength short time, v/mil |
D149 |
20-1120 |
450-690 |
Polyhedron Laboratories specializes in performing the tests listed in the above table. Contact Polyhedron Labs Today!
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