Polypropylene Testing

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.

Polypropylene Characteristics

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,
10-6 in/in/°C

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

 

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