PPb Threaded Fittings

Our threaded polypropylene (PP) fittings range is engineered for demanding industrial applications where chemical resistance, mechanical strength and long-term reliability are essential. Manufactured from beige-grey polypropylene block copolymer (PP-B), these fittings are designed to provide secure, leak-tight threaded connections within chemically aggressive and high-temperature environments.

This category includes a comprehensive selection of imperial BSP threaded fittings, including threaded sockets, 90° elbows, tees, unions, barrel nipples, reducing bushes, plugs, end caps and full-face flanges, as well as plain × BSP transition fittings for connecting threaded components to socket-fusion pipe systems. The range is ideal where mechanical jointing, easy removal or compatibility with existing threaded equipment is required.

Polypropylene is a modern thermoplastic that combines durability, excellent chemical resistance and thermal stability with non-toxic, food-grade properties. This makes threaded PP fittings suitable for sensitive environments such as food processing, pharmaceutical manufacturing, laboratories and water treatment systems, as well as general industrial use.

All threaded pressure fittings in this category are manufactured from polypropylene block copolymer (PP-B) in RAL 7032 beige-grey, ensuring consistent quality, dimensional accuracy and long service life.

Key characteristics include:

• PP-B construction for enhanced toughness and impact resistance
• Imperial BSP threaded connections for compatibility with valves, equipment and pipework
• Pressure-rated designs suitable for industrial process systems
• Manufactured in accordance with recognised DIN and ISO dimensional and quality standards

Where applicable, fittings are designed to operate within PN6 / PN10 pressure systems, depending on size and configuration.

The threaded polypropylene fittings category includes:

• Threaded sockets, elbows and tees for directional changes and branching
• Threaded unions for easy system disassembly and maintenance
• Barrel nipples (including plain × BSP variants) for equipment and valve connections
• Reducing bushes for size transitions within threaded systems
• Threaded plugs and end caps for blanking off lines and test points
• Threaded full-face flanges (NP10/16) for bolted connections to valves, pumps and vessels
• Plain × BSP fittings for transitioning between socket-fusion pipework and threaded components

This broad selection allows complete threaded systems to be built or integrated seamlessly into mixed-connection pipework installations.

Polypropylene is available in several material forms, each offering different performance characteristics:

• PP-H (homopolymer) - high stiffness, lower impact resistance at low temperatures
• Beta-nucleated PP-H - improved toughness
• PP-B (block copolymer) - superior impact resistance and durability

Threaded fittings place additional stress on the material around the thread form. PP-B is specifically chosen because it delivers:

• Excellent impact resistance, even at sub-zero temperatures
• Improved resistance to cracking under mechanical stress
• Strong chemical resistance across a wide operating range

This makes PP-B particularly well suited to threaded connections, where reliability and long-term sealing performance are essential.

• Imperial BSP Threads
  • Provides secure mechanical joints and compatibility with valves, pumps, instrumentation and existing threaded pipework
• Smooth Internal Bore
  • Minimises friction losses, supporting efficient flow and reduced pressure drop
• Demountable & Serviceable
  • Threaded and union fittings allow systems to be dismantled for inspection, cleaning or modification without cutting pipework
• Corrosion-Free
  • Polypropylene does not rust, scale or corrode, even in chemically aggressive or high-moisture environments
• Lightweight
  • Significantly lighter than metal alternatives, reducing handling effort and installation time
• Thermal Insulation
  • Low thermal conductivity reduces heat loss and external condensation compared to metal pipe systems
• UV-Resistant Pigmentation
  • Beige-grey PP offers good resistance to UV exposure, making it suitable for outdoor installations in UK conditions
• Temperature Performance
  • Continuous operating range: -20°C to 110°C
  • Short-term exposure: up to 130°C
• Impact & Abrasion Resistance
  • Excellent resistance to damage during handling and installation, suitable for slurry and particulate media

Polypropylene is widely used in industrial pipework due to its outstanding chemical resistance:

• Excellent resistance to water and inorganic environments
• Highly resistant to strong mineral acids and alkalis
• Very low water absorption
• Minimal material degradation in aqueous solutions

While PP performs extremely well in most applications, strong oxidising agents at elevated temperatures can cause degradation. For aggressive or specialist chemical duties, technical advice is recommended.

Threaded imperial polypropylene fittings are commonly used in:

• Chemical processing and distribution systems
• Pharmaceutical and biotechnology facilities
• Laboratories and hospital services
• Water treatment and de-ionised water systems
• Brewing, distilling and food production
• Electronics and semiconductor manufacturing
• Effluent and industrial waste treatment

Common conveyed media include acids, alkalis, alcohols, brines, solvents, plating solutions, sugar solutions and industrial slurries.