About Smiths

We are a world-class supplier of engineering raw materials. Our objective is to provide all our customers, from the small machine shop to the large multi-national corporation, a supply path that continuously delivers the highest levels of service, quality and value.


Engineering Plastic

Polypropylene Engineering Plastic

Polypropylene (PP-H) - high-quality general-purpose engineering plastic material; the chemical name is polypropylene homopolymer, and it’s available in a range of grades and forms to suit many applications.


The machining of polypropylene is uncomplicated, provided the component tolerances allow for polypropylene’s relatively high coefficient of thermal expansion and tensile elongation values. Full machining instructions are available on request. We process your polypropylene grade material in-house with stock availability across our service centre network.

Chemical Resistance

PP-H has extremely good resistance to acids, alkalis and alcohol, salts in aqueous solutions and many solvents. Slight swelling may be caused by permanent contact with grease, oil and wax, but generally not enough to limit the use of the material. Aromatics and halogenated hydrocarbons will cause a reduction in useful working life. The material has no resistance to strong oxidising agents such as nitric or chromic acids, and halogens.

Typical Applications

Commercial applications for this engineering material include:

  • Pump and valve parts
  • Spacers
  • Gaskets

We stock polypropylene in round bar, sheet, round tube and hollow bar.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.

Additional Info

A technical datasheet for Polypropylene is available in PDF file format. To view and download, please click here.

We offer in-house processing options - for more information, please refer to our processing services.

Read our corporate brochure by clicking here.

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