PVCu Pressure Pipe: The Ultimate Guide
Everything in the pipeline about PVCu pressure pipe
Published: 22nd September 2025 - Updated: 26th September 2025
In this guide, we’ll take you through everything you need to know about PVCu Pressure Pipe, from what it’s made of to how it’s installed.
We hope this guide can answer your questions, but should you need further advice, please get in contact with us.
What is the difference between PVC and PVCu?
PVC stands for Polyvinyl Chloride, and PVCu stands for Unplasticised Polyvinyl Chloride.
Although they share similar names, their use cases are totally different. PVC is a more flexible material, often used in products such as cable insulation, inflatable products and flexible hoses. PVCu, however, is a much more rigid and durable material, used to make PVCu Pressure Pipe for water and chemical systems, which is what we will be talking about here, although you may see PVC and PVCu used interchangeably. Always check the technical specification of a product to ensure it meets your requirements.
What is PVCu pipe made from?
PVCu pipe is made from Unplasticised Polyvinyl Chloride, a rigid and chemically resistant thermoplastic. It is a homopolymer of vinyl chloride, with additives to enhance performance, but without plasticisers. Each component serves a specific function:
- Vinyl Chloride Monomer (VCM): The base resin that forms the polymer backbone, offering inherent chemical resistance and rigidity.
- Thermal Stabilisers: Prevent degradation during extrusion and ensure long-term thermal stability.
- Fillers (e.g. calcium carbonate): Enhance dimensional stability and mechanical strength while reducing cost.
- Lubricants and Processing Aids: Improve flow during extrusion and moulding, ensuring a consistent surface finish.
- Pigments: Provide colour and improve UV resistance.
PVCu’s formulation results in a non-flexible, durable material ideal for pressure pipe systems, valves, and building products.
Is PVCu known by any other names?
PVCu is also commonly referred to as uPVC, but these terms refer to the same material.
What is PVCu Pressure Pipe used for?
- Cold Water Distribution
- Extensively used in plumbing systems for conveying potable cold water in residential and commercial buildings.
- Complies with UK water regulations for safe drinking water transport.
- Industrial Process Piping
- Suitable for transporting non-pressurised and pressurised chemical fluids in manufacturing, food processing, and chemical industries.
- Compatible with a wide range of acids, alkalis, and solvents.
- Agricultural & Irrigation Systems
- Employed in non-potable water systems for irrigation and agricultural drainage.
- Offers resistance to fertilisers, pesticides, and outdoor conditions.
Why It’s Chosen Over Alternatives
- Corrosion Resistance: Unlike metal or copper, PVCu does not corrode, rust, or degrade in the presence of moisture or most chemicals.
- Cost Effectiveness: PVCu is significantly more affordable than copper and many metal alternatives, both in terms of material cost and installation.
- Lightweight: Considerably lighter than metal or ABS pipes, making it easier to handle and transport.
- Easy to install: Installation is simpler and often faster, with solvent welding systems reducing the need for specialised labour or tools.
- Chemical Resistance: Highly resistant to a wide range of acids, alkalis, and other aggressive substances.
How is PVCu pipe measured?
Measurements of standard PVCu are always taken from the outside diameter of the pipe. PVCu is sold in metric and imperial sizes in the UK.
Click on the expanding tables below for specific details!
| Nominal Size (inch) | Average Outside Diameter (mm) | Average Bore Inside Diameter (mm) | Average Wall Thickness (mm) | Weight per 6m Length (kg) |
|---|---|---|---|---|
| Class C - 9 bar | ||||
| 2 | 60.3 | 54.7 | 2.8 | 5.95 |
| 2 1/2 | 75.2 | 68.8 | 3.2 | 9.89 |
| 3 | 88.9 | 81.3 | 3.8 | 12.00 |
| 4 | 114.3 | 104.6 | 4.9 | 16.30 |
| 5 | 140.2 | 128.3 | 6.0 | 24.42 |
| 6 | 168.3 | 154.1 | 7.1 | 34.98 |
| 8 | 219.1 | 202.3 | 8.4 | 68.70 |
| Class D - 12 bar | ||||
| 1 1/4 | 42.2 | 37.2 | 2.5 | 3.51 |
| 1 1/2 | 48.2 | 42.6 | 2.8 | 4.62 |
| 2 | 60.3 | 53.5 | 3.4 | 7.18 |
| 3 | 88.9 | 78.9 | 5.0 | 15.40 |
| 4 | 114.3 | 101.3 | 6.5 | 21.30 |
| 6 | 168.3 | 149.3 | 9.5 | 45.80 |
| Class E - 15 bar | ||||
| 1/2 | 21.3 | 17.5 | 1.9 | 1.35 |
| 3/4 | 26.8 | 22.4 | 2.2 | 1.91 |
| 1 | 33.6 | 28.6 | 2.5 | 2.73 |
| 1 1/4 | 42.2 | 36.2 | 3.0 | 4.30 |
| 1 1/2 | 48.2 | 41.4 | 3.4 | 5.56 |
| 2 | 60.3 | 51.9 | 4.2 | 8.77 |
| 2 1/2 | 75.2 | 65.4 | 4.9 | 14.71 |
| 3 | 88.9 | 76.5 | 6.2 | 18.80 |
| 4 | 114.3 | 98.5 | 7.9 | 25.47 |
| 6 | 168.3 | 144.9 | 11.7 | 61.77 |
| Class 7 - 12 bar | ||||
| 1/2 | 21.3 | 13.3 | 4.0 | 2.55 |
| 3/4 | 26.8 | 18.6 | 4.1 | 3.51 |
| 1 | 33.6 | 23.8 | 4.9 | 5.10 |
| 1 1/4 | 42.2 | 31.8 | 5.2 | 7.10 |
| 1 1/2 | 48.2 | 37.2 | 5.5 | 8.69 |
| 2 | 60.3 | 48.5 | 5.9 | 12.20 |
All measurements are averages. Tolerances are in accordance with BS-EN 1452.
| Outside Diameter (mm) | Inside Diameter (mm) | Average Wall Thickness (mm) | Weight per 6m Length (kg/m) |
|---|---|---|---|
| 10 Bar | |||
| 40 | 36.2 | 1.9 | - |
| 50 | 45.2 | 2.4 | - |
| 63 | 57.0 | 3.0 | 7.10 |
| 75 | 67.8 | 3.6 | 10.14 |
| 90 | 81.4 | 4.3 | 14.53 |
| 110 | 101.6 | 4.2 | 17.55 |
| 125 | 115.4 | 4.8 | 22.58 |
| 140 | 125.0 | 5.4 | 28.80 |
| 160 | 147.6 | 6.2 | 37.50 |
| 200 | 184.6 | 7.7 | 43.8 |
| 225 | 207.8 | 8.6 | 5502 |
| 250 | 230.8 | 9.6 | 67.16 |
| 315 | 290.8 | 12.1 | 107.76 |
| 16 Bar | |||
| 16 | 13.6 | 1.2 | 0.87 |
| 20 | 17.0 | 1.5 | 1.12 |
| 25 | 21.2 | 1.9 | 1.75 |
| 32 | 27.1 | 2.4 | 2.87 |
| 40 | 34.0 | 3.0 | 4.38 |
| 50 | 42.6 | 3.7 | 6.70 |
| 63 | 53.6 | 4.7 | 10.70 |
| 75 | 63.8 | 5.6 | 15.17 |
| 90 | 76.6 | 6.7 | 21.63 |
| 110 | 96.8 | 6.6 | 26.50 |
| 160 | 141.0 | 9.5 | 56.00 |
All measurements are averages. Tolerances are in accordance with BS-EN 1452 Part 2.
How long does PVCu pipe last?
PVCu pipe typically has a service life of 50 years or more, depending on the operating conditions, installation quality, and maintenance. According to a recent study, under ideal conditions, it can last up to 100 years.
Can PVCu pipe be buried?
Yes! PVCu pipe is suitable for underground installation. In non-trafficked areas, a minimum cover of 600 mm is recommended, while in trafficked areas such as roads, a cover of 750 mm or more is advised.
What fittings can be used on PVCu pipe?
PVCu pipe is commonly connected using solvent-weld fittings and a dedicated solvent cement. This method chemically bonds the pipe to the fitting, forming a durable, permanent, and watertight seal designed for long-term reliability.
How do I cut PVCu pipe?
PVCu pressure pipe can be cut using two primary methods: an ABS/PVC saw or an adjustable pipe cutter. While a saw is typically quicker and more economical, it often leaves a rougher edge. An adjustable pipe cutter, on the other hand, delivers a cleaner and more accurate finish. For step-by-step guidance on using an adjustable pipe cutter, refer to the video below. Whichever method is used, always chamfer and deburr the pipe after cutting to ensure a proper fit and secure joint.
How do I join PVCu pressure pipe?
The most popular method for joining PVCu pipe (as mentioned above) is by the use of solvent weld fittings. These are easy to install, cost-effective and provide a strong, chemically bonded seal.
- Cut the pipe to the desired length
- Chamfer and deburr the pipe, and remove any debris created by this process
- Dry fit the fitting onto the pipe and mark a line where the fitting ends to ensure proper fitment when glueing
- Use an emery cloth on the end of the pipe to ensure good adhesion
- Use cleaning fluid on a paper towel to clean both the end of the pipe and the inside of the fitting
- Apply a generous amount of solvent cement to the end of the pipe and the inside of the fitting using a brush
- Avoid twisting and push the fitting onto the pipe, holding it in place for 30 seconds
- Wipe away any excess glue for a smooth finish
Things to remember:
- Always measure twice to ensure the correct cut is made
- Always clean the pipe and fittings before applying cement
- Always allow enough time for the cement to set before use - 30 seconds initial set, 24 hours full cure time
Can I use ABS glue on PVCu pipe?
- No, the chemicals used to create ABS and PVC are different, and thus require different compounds to join them
The video below will show you everything you need to know about joining pipes with solvent welding.
What is the difference between PVCu and ABS?
PVCu is widely used across various industries, but it does have certain limitations. Refer to the table below for further details.
| Trait | ABS | PVCu |
| Impact / Strength | ABS is better at low temperatures and is more impact-resistant. Less likely to become brittle in cold. | More brittle under impact, especially at lower temperatures. PVCu’s performance decreases more with cold. |
| Temperature | -40 - 70° | 0 - 60°C |
| Chemical Resistance | Good vs diluted inorganic acids, salts, some oils/fats; not good with organic solvents, petrol, vegetable oils, etc | Broader chemical resistance overall. Some PVCu pipes are better than ABS vs more aggressive chemicals |
| UV / Outdoor Use | Not UV resistant; needs protection from sunlight | Better UV resistance. More suitable for outdoor exposure |
| Cost | Often more expensive, but can be required in certain areas | Generally cheaper, very widely used |
Suitability & Applications
- Choose PVCu for applications requiring enhanced chemical resistance, improved UV stability, or higher pressure performance (where appropriately rated). It is also commonly used for potable water systems, irrigation, and general industrial fluid handling.
- Choose ABS in applications where reliable performance in cold conditions is essential, or where impact resistance is important and low-temperature brittleness is a concern. Ideal for industrial or low-temperature environments where pipes may be subject to rough handling or mechanical stress.
The video below will explain the differences and similarities between PVCu and ABS pressure pipe.
We hope this guide has clarified whether PVCu is the right solution for your application. It’s also designed to give you the confidence to install and use it correctly, ensuring optimal performance and reliable results.
To make things even easier, we’ve included some extra videos below!
Useful Videos
Still have questions? Get in touch via the contact us page.
