Technical Information

What is Polypropylene ?

Polypropylene (PP) is a member of the polyolefin family of plastics. Polyolefins are one of the so-called commodity thermoplastics. The polyolefin family includes PP, polyethylene, polybutylene, and various other derivatives.
Polypropylene has turned out to be the most versatile of the polyolefin family, accounting for the continuing rapid increase in its use, approximately 12% in 2015. It is highly versatile due to a combination of factors. These factors include excellent chemical and heat resistance a good balance of physical and mechanical properties, a very favorable strength-to-weight ration and low taste and odor characteristics.


Characteristics of Polypropylene –

The main characteristics observed in Polypropylene family are –


  • Polypropylenes have better resistance to heat (heat distortion temperature at 66 psi: 200 - 250°F.) and resist more chemicals than do other thermoplastic materials of the same cost.
  • Polypropylene have negligible water absorption and excellent electrical properties, and they are easy to process.
  • In much the same way that density is important in determining the mechanical properties of poly-ethylenes, the stereo-regularity (related to the repeated units in the stereo-regular molecular chain) of a polypropylene very often determines the characteristics of the material. An increase in the stereo-regularity of a polypropylene will sharply increase the yield strength of the material. The hardness, stiffness, and tensile strength also increase. On the other hand, as stereo-regularity decreases, elongation and impact strength increase.
  • The ability to carry light loads for long periods over wide temperature ranges is one of the properties that make polypropylenes valuable in engineering applications. Polypropylenes do not have outstanding long-term creep resistance, but their fatigue endurance limit is excellent. In fact, polypropylene often is referred to as the "living hinge" thermoplastic.
  • One of the limitations most often mentioned for polypropylenes is their low-temperature brittleness (-4°F). However, polypropylene copolymers have been developed with brittleness points of about -20°F.
  • Like all other poly-olefins, polypropylenes have excellent resistance to water and to water solutions, such as salt and acid solutions that are destructive to metals. They also are resistant to organic solvents and alkalis. Above 175°F, polypropylene is soluble in aromatic substances such as toluene and xylene, and in chlorinated hydrocarbons such as trichloro-rethylene.
  • Polypropylenes have excellent electrical resistivity (both volume and surface), and their dielectric strength is high.

What are the benefits of Polypropylene?

Polypropylene is increasingly displacing a number of other materials in a variety of applications. Typically, one or more of the following reasons is given for replacing another material with polypropylene:


  • Superior functionality: Some feature of PP such as extended hinge life, long term storage capabilities, speed of process-ability, or heat resistance will often dictate a switch from another material to the use of PP in a specific application.
  • Cost: Because PP has a bulk density of approximately 0.900 g/cm3 you may often use less material (by weight) to produce an article than would be required from some other material.
  • Environmental profile: PP is an inert material that contains no dioxins and is not carcinogenic. It burns cleanly and does not release toxic fumes. It can also be recycled with relative ease. For these reasons, PP is often an ideal material when environmental issues are a concern.
  • The greatest commercial uses for homo-polymer PP are in fibers and filaments. PP fibers are woven into fabrics and carpets, and they are also used to produce non-woven fabrics for disposables. Slit-tape filaments are used as jute replacements in carpet backings and sacks.
  • Homo-polymer PP is injection molded into caps and closures, appliance components and auto parts.
  • Random copolymer PP (with up to 7% ethylene) has higher impact strength and better clarity than the homo-polymer. Its heat distortion temperature is lower than that of homo-polymer 150 to 250°F under 66 psi load. These materials are used in blow-molded containers (including oriented and multi-layer bottles), injection-molded packaging, and flexible mono-layer and co-extruded films.
  • PP has proven to be an excellent material for producing various types of sheet and film. Polypropylene resins may be specifically designed for applications ranging from blow molding to film sheet, and fiber extrusion.

PRODUCT DATA SHEET FOR RIGID POLY-PROPYLENE (PP) EXTRUSIONS

Material Characteristics, Test Standards and Typical Results of Rigid PP Profile

S. No. Characteristics Tested Standard Followed Typical Values
1 SHORE HARDNESS D
(Rockwell)
DIN EN ISO 868 750
2 DENSITY
(Gm/cm3)
DIN EN ISO 1183 1.00
3 YIELD STRESS
(Mpa)
DIN EN ISO 527 25
4 ELONGATION – at Yield
(%)
DIN EN ISO 527 7
5 TENSILE MODULUS OF ELASTICITY
(Mpa)
DIN EN ISO 527 1400
6 NOTCHED IMPACT STRENGTH
(kJ/m2)
DIN EN ISO 179 9.0
7 MEAN COEFFICIENT OF THERMAL EXPANSION
(K-1)
DIN 53752 1.6 x 10-4
8 THERMAL CONDUCTIVITY
(W/m.K)
DIN 52612 0.22
9 FIRE BEHAVIOUR DIN 4102
UL 94
Normal Flammability
V-0 > 4 mm
10 TEMPERATURE RANGE
(0 C)
0 - 1000

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