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Polypropylene ( PP )

Material Information

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We stock and supply the following standard forms:
Fibre Film Granule Honeycomb Laminate Mesh Metallised Film Rod Sheet
Fibre Film Granule Honeycomb Laminate Mesh Metallised Film Rod Sheet
Sphere Tube
Sphere Tube

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Common Brand Names:
Appryl, Hostalen PP, Lacqtene, Novolen, Propathene
 
General Description:  

General Description : A semi-crystalline, white, semi-opaque commodity thermoplastic made in a very wide variety of grades and modifications. It is a linear polyolefin which can be compared in many ways to high density polyethylene (HDPE) and that is manufactured in a very similar way. The catalysts used control the polymer's stereoregularity quite well so that commercial polypropylenes (PP) are usually predominantly isotactic. PP homopolymer is harder and has a higher temperature resistance than HDPE but lower impact resistance and becomes brittle below ~0C. Hence copolymer grades are preferred for all applications exposed to cold/winter conditions. These copolymers have better impact strength, maintained down to lower temperatures, than homopolymer at the expense of quite small reductions in other properties. Like polyethylenes, PP has good chemical but poor UV resistance (unless stabilised or protected).

Due to thermal stability issues with materials such as PP, additives such as anti-oxidants are invariably used during processing. It should also be noted that when considering the use of heat sealable films, that this product is in fact a coextruded film, comprising a PP core layer and PP/PE copolymer outer layers. These films are also corona treated to aid adhesion and may well also contain an anti-blocking additive such as silica. If you have any doubts about the suitability of any of these materials, please ask for confirmation prior to placing a purchase order.

Applications include (for homopolymers) appliance housings, housewares, packaging, cassette holders and fibres, monofilaments and slit-film tapes; for copolymers pipes, containers, boat hulls, seat shells and automotive parts e.g. battery cases and bumpers though the latter are often made from more heavily elastomer-modified polypropylenes.

   

Chemical Resistance

Acids - concentrated Good-Fair
Acids - dilute Good-Fair
Alcohols Good
Alkalis Good
Aromatic hydrocarbons Fair
Greases and Oils Good-Fair
Halogenated Hydrocarbons Good-Poor
Halogens Poor
Ketones Good

Electrical Properties

Dielectric constant @1MHz 2.2-2.6
Dielectric strength ( kV mm-1 ) 30-40
Dissipation factor @ 1MHz 0.0003 - 0.0005
Surface resistivity ( Ohm/sq ) 1013
Volume resistivity ( Ohmcm ) 1016-1018

Mechanical Properties

Abrasive resistance - ASTM D1044 ( mg/1000 cycles ) 13-16
Coefficient of friction 0.1-0.3
Elongation at break ( % ) 150-300, for biax film >50
Hardness - Rockwell R80-100
Izod impact strength ( J m-1 ) 20-100
Tensile modulus ( GPa ) 0.9-1.5, for biax film 2.2-4.2,
Tensile strength ( MPa ) 25-40, for biax film 130-300,

Physical Properties

Density ( g cm-3 ) 0.9
Flammability HB
Limiting oxygen index ( % ) 18
Radiation resistance Fair
Refractive index 1.49
Resistance to Ultra-violet Poor
Water absorption - equilibrium ( % ) 0.03

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 100-180
Heat-deflection temperature - 0.45MPa ( C ) 100-105
Heat-deflection temperature - 1.8MPa ( C ) 60-65
Lower working temperature ( C ) -10 to -60
Specific heat ( J K-1 kg-1 ) 1700 - 1900
Thermal conductivity @23C ( W m-1 K-1 ) 0.1-0.22
Upper working temperature ( C ) 90-120

Properties for Polypropylene Film

Property Value
Dielectric Strength @25µm thick kV mm-1 200
Dissipation Factor @1MHz 0.0003
Elongation at Break % 50-1000
Heat-sealing Temperature C 140-205
Initial Tear Strength g µm-1 18-27
Permeability to Carbon Dioxide @25C x10-13 cm3. cm cm-2 s-1 Pa-1 6 @ 30C
Permeability to Hydrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 30
Permeability to Nitrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.3
Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 1.7 @ 30C
Permeability to Water @25C x10-13 cm3. cm cm-2 s-1 Pa-1 16
Permeability to Water @38C x10-13 cm3. cm cm-2 s-1 Pa-1 70

Properties for Polypropylene Tube

Property Value
Material Biaxially oriented tube
Relative Impact Strength 2.5
Tensile modulus - Longitudinal GPa 2
Tensile modulus - Transverse GPa 1.3 - hoop
Tensile strength - Longitudinal MPa 125
Tensile strength - Transverse MPa 40 - hoop

Buy Polypropylene on-line

We stock and supply the following standard forms:
Fibre Film Granule Honeycomb Laminate Mesh Metallised Film Rod Sheet
Fibre Film Granule Honeycomb Laminate Mesh Metallised Film Rod Sheet
Sphere Tube
Sphere Tube

Choose a form to search our on-line catalogue  

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