author
Bobby Brown
Post 2016-02-19
PP Material Characterization

Contents of this article


What is PP

Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene.
Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar. Its properties are similar to polyethylene, but it is slightly harder and more heat-resistant. It is a white, mechanically rugged material and has a high chemical resistance.


Chemical and physical properties

Polypropylene is in many aspects similar to polyethylene, especially in solution behaviour and electrical properties. The methyl group improves mechanical properties and thermal resistance, although the chemical resistance decreases.[8]: 19  The properties of polypropylene depend on the molecular weight and molecular weight distribution, crystallinity, type and proportion of comonomer (if used) and the isotacticity.[8] In isotactic polypropylene, for example, the methyl groups are oriented on one side of the carbon backbone. This arrangement creates a greater degree of crystallinity and results in a stiffer material that is more resistant to creep than both atactic polypropylene and polyethylene.


Chemical resistance chart - PP

How to read the chart

  • Meaning of symbol:
    OK:Recommended.
    △:Must confirm if usable by testing in advanced.
    X:Not recommended.
    N/A:Not Applicable
  • This chart only provides the result of a single chemical to material, if a client uses more than one kind of chemical at the same time, please choose material by experience.
  • This chart is for reference only which is not applicable to all working environments. Please refer to design equipment according to practical experience.
Category Chemical PP
Organic acids Acetic acid OK (20%)
Acetic acid, glacial N/A
Acetic anhydride N/A
Citric acid N/A
Organic compound Acetaldehyde OK (20˚C)
Acetone △ (20˚C)
Methyl alcohol N/A
Aniline N/A
Benzaldehyde OK (70˚C)
X (100˚C)
Benzene OK (20˚C)
X (70˚C)
Benzyl alcohol OK
Benzyl chloride N/A
Corn oil N/A
Ethanol OK (96% @ 70˚C)
Ethylene glycol OK
Fatty acid N/A
Formaldehyde OK (10%)
OK (40%)
Formic acid N/A
Hexane X (20˚C)
Lactic acid N/A
Methanol OK (20˚C)
Paraffin oil N/A
Petroleum N/A
Phenol N/A
Propane, liq N/A
Propanol N/A
Stearic acid N/A
Tannic acid N/A
Tartaric acid N/A
Toluene X
Urea N/A
Inorganic compound Ammonia N/A
Ammonium chloride N/A
Ammonium hydroxide N/A
Ammonium nitrate N/A
Ammonium sulfate N/A
Aqua regia N/A
Barium chloride N/A
Barium hydroxide N/A
Brine N/A
Calcium Chloride N/A
Calcium hydroxide N/A
Carbonic acid N/A
Chloric acid N/A
Chlorine OK (10%)
△ (30%)
Detergent N/A
Hydrobromic acid N/A
Hydrochloric acid N/A
Hydrofluoric acid OK (20˚C)
Hydrogen peroxide N/A
Nitric acid OK (20˚C)
Phosphoric acid OK (70˚C)
Potassium hydroxide N/A
Potassium nitrate N/A
Potassium sulfate N/A
Sodium carbonate N/A
Sodium hydroxide OK (50%)
Sodium nitrate N/A
Sulfuric acid OK (30% @ 70˚C)
△ (30% @ 100˚C)
OK (100% @ 20˚C)
△ (100% @ 70˚C)
Sulfur dioxide N/A

Citations

  1. ^ Polypropylene - Wikipedia
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Bobby Brown    2023-8-8
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