PP — Polypropylene
Very low density with excellent chemical resistance and good fatigue life — easily welded for fabricated structures.
Polypropylene is one of the lightest engineering plastics, with outstanding resistance to acids, alkalis and many solvents. It has good fatigue life and is readily welded, making it a favourite for chemical plant and laboratory equipment.
Its low cost, chemical resistance and weldability make PP ideal for tanks, ducting and fabricated process equipment.
Key Properties
| Density | 0.90 – 0.91 g/cm³ (lightest common plastic) |
| Service temperature | −20 to +100 °C |
| Water absorption | < 0.01 % |
| Tensile strength | 25 – 40 MPa |
| Chemical resistance | Excellent against acids, alkalis and solvents |
| Fatigue resistance | Good — ideal for living hinges |
| Weldability | Excellent — butt and hot-gas welding |
| Food contact | FDA-compliant grades available |
Typical Applications
- Chemical tanks and linings
- Ducts and fume-hood components
- Laboratory and medical equipment
- Battery cases and trays
- Fabricated process vessels
- Food-handling and packaging parts
Available Forms & Sizes
| Form | Size range | Notes |
|---|---|---|
| Sheet / Plate | 2 – 60 mm thick | Natural, grey, colours |
| Rod | 20 – 150 mm diameter | Round bar |
| Welded fabrication | Custom tanks & ducts | Made to drawing |
Grades & Modifications
Available in homopolymer and copolymer grades, plus UV-stabilised, anti-static, flame-retardant and food-contact compliant versions. Colour matching is available for fabricated equipment.
Machining & Fabrication
PP is easily CNC machined and, importantly, easily welded. We fabricate tanks, ducts and liners by butt-welding and hot-gas welding, then finish-machine to drawing.
Need PP to your specification?
Send us your drawing, sizes and quantity — we will quote within 24 hours.