CPVC Pipes
Last updated: October 2026 | Reviewed by the Ajay Pipes technical team
CPVC pipes are plastic pipes made from chlorinated polyvinyl chloride, and they carry hot and cold water safely in homes, hotels, hospitals and factories. They resist heat up to 93°C, they do not rust, and they join easily with solvent cement. This guide covers their sizes, standards, uses and installation basics, so you can pick the right pipe for your project.
What Are CPVC Pipes?
CPVC is a thermoplastic made by adding extra chlorine to PVC. The added chlorine raises the heat resistance and the strength of the material. As a result, the pipe stays rigid in hot water lines where ordinary PVC would soften. Manufacturers make CPVC pipes with twin screw extrusion, and fitters join them with CPVC solvent cement.
Want the basics first? Read our CPVC full form guide. You can also see how CPVC is made for the chemistry.
What Sizes of CPVC Pipes Are Available in India?
Indian suppliers sell CPVC pipes in two size systems. Copper Tube Size (CTS) suits most homes. Iron Pipe Size (IPS) suits large buildings and industry.
| System | Sizes | Wall Type | Standard |
|---|---|---|---|
| CTS | 1/2″ (15 mm), 3/4″ (20 mm), 1″ (25 mm), 1-1/4″ (32 mm), 1-1/2″ (40 mm), 2″ (50 mm) | SDR 11, SDR 13.5 | IS 15778, ASTM D 2846 |
| IPS | 2-1/2″ (75 mm), 3″ (90 mm), 4″ (110 mm), 6″ (160 mm), 8″ (200 mm) | SCH 40, SCH 80 | ASTM F 441 |
SDR stands for standard dimension ratio. A lower SDR means a thicker wall and a higher pressure rating. For example, Ajay Flowline Plus SDR 11 pipe is rated at 8.8 kg/cm2 at 82°C, while SDR 13.5 is rated at 7.0 kg/cm2. In the same way, Schedule 80 pipe has a thicker wall than Schedule 40.
Which Standards Apply to CPVC Pipes?
Indian buyers should look for IS 15778, the national standard for CPVC pipes. American standards also apply. ASTM D 2846 covers CTS pipes and fittings, and ASTM F 441 covers IPS Schedule 40 and Schedule 80 pipes. Ask your supplier for the standard number on the quote and on the pipe marking. Doing so confirms that you are buying a tested product.
Where Do You Use CPVC Pipes?
CPVC pipes suit a wide range of hot and cold water jobs.
- Hot and cold water lines in homes and apartment buildings
- Plumbing in hotels, hospitals and commercial buildings
- Water and food liquid transport
- Industrial lines for hot, corrosive fluids and many acids and bases
- Indoor and outdoor plumbing runs
Why Are CPVC Pipes a Good Choice for Hot Water?
CPVC solves the problems that damage metal pipes and ordinary plastic pipes.
- Heat resistance: the pipe handles hot water up to 93°C.
- No rust or scale: the inner wall stays smooth, so flow stays steady.
- Flame retardant: CPVC is self-extinguishing and does not feed a fire.
- Chemical resistance: the pipe withstands many acids, bases, salts and alcohols.
- Easy joining: solvent cement bonds the fittings, so installation is quick.
How Do You Join CPVC Pipes?
Good joints decide how long a CPVC system lasts. Follow these steps for each joint.
- Cut the pipe square and remove burrs from the edge.
- Dry fit the pipe into the fitting to check the depth.
- Apply CPVC solvent cement to the pipe and the fitting socket.
- Push the pipe in with a slight twist and hold it for a few seconds.
- Let the joint cure for the time the cement maker states before you test the line.
Why Choose Ajay Flowline Plus CPVC Pipes?
Ajay Flowline Plus uses premium compound from a leading US-based supplier. The system holds NSF/ANSI 14 and 61 certification from IAPMO India, so it is safe for drinking water. Ajay designs the system for a 50 year life, and the range covers pipes, fittings, valves and solvent cement. Our technical team also trains plumbers on site. Explore the full Ajay Flowline Plus CPVC range for specifications.
Conclusion
CPVC pipes give you a safe, long-lasting answer for hot and cold water. Choose CTS sizes for homes and IPS sizes for large projects. Always check the standard marking and use matching solvent cement. For a quote or technical help, call toll free 1800 11 4050 or email enquiry@ajaypipes.com.
FAQs
CPVC stands for chlorinated polyvinyl chloride. It is PVC with extra chlorine, which raises its heat resistance.
CPVC pipes handle hot water up to 93°C.
CTS sizes (1/2 to 2 inch) suit homes. IPS sizes (2-1/2 to 8 inch) suit large buildings and industry.
IS 15778 and ASTM D 2846 cover CTS pipes. ASTM F 441 covers IPS Schedule 40 and Schedule 80 pipes.
Yes. Ajay Flowline Plus holds NSF/ANSI 14 and 61 certification from IAPMO India for drinking water use.
For any queries, contact the plumbing experts at Ajay pipes on the Toll Free No. : 1800-11-4050 or via email at our email address info@ajaypipes.com
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