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| Field of Application |
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| The food industry houses many opportunties
for using PP. It is resistant to fluids, detergents and
those chemicals normally used by companies working with
foodstuffs. |
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| Characteristics |
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| PP is characterized by its: |
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- Excellent tensile strength.
- Good, all-around chemical resistance.
- High fatigue resistance.
- Being able to tolerate steam sterilization and usage
with warm water.
- High electrical insulation.
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| PP should not be used: |
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- At temperatures below 0°C (becomes very brittle)
- With heavy mechanical stress.
- Outside (ultraviolet light attacks the material)
- With strong oxidizing media.
- If wear and tear resistance is a priority.
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| Mechanical |
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| To begin with PP is stiffer than PE,
though its impact resistance is not as good. PP is very
flexible. |
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| Thermal |
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| PP has a field of application within
the following range of temperatures (+5°C to +105°C) |
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| Physiological |
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| PP is neutral in smell and taste, and
has no adverse effects on the skin. It is suitable for use
in the food industry. Products made of PP can receive BGA
(Germany) and FDA approval (USA). |
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| Chemical Resistance |
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| Just as PE, PP excels in its resistance
to chemicals. Aqueous solutions of salt, acids or bases
(inorganic), as well as alcohol and some oils do not affect
PP. A soap bath at more than 100°C can also be tolerated.
It is not resistant to strong oxidizing solutions. Petrol,
benzine and several other hydrocarbons result in swelling,
this action being exacerbated if halogens are also present. |
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| Fire |
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| PE is ignitable and burns with a light
blue flame with a yellow tip. The smoke, especially after
the flames are extinguished, has a sweet, resin-like smell,
similar to the smell of burning lube oil. The ignition point
is 345°C |
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| Finishing/Processing |
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| Welding |
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| Welding is an especially good way to
join PP elements. Hot gas welding equipment can be used
and a heat mirror. Spin welding is another alternative,
as in ultrasonic sealing. High-frequency welding is not
possible. |
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This page is
best viewed at a resolution of |
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 with
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Copyright
© 2000 by P.B.A. Industrial Supplies Ltd and
Scanbelt A/S
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