What is CPVC Full Form? - Ajay Pipes
CPVC, CPVC full form and CPVC Meaning


What is CPVC?

CPVC full form in plumbing is Chlorinated Polyvinyl Chloride which means more chlorine has been added to PVC. CPVC products are thermoplastic and are made with CPVC resins. They are one of the strongest and durable materials used in the plumbing applications for more than 50 years now. CPVC is resistant to chemical, reliable, and can withstand high heat temperature to 93 degree C and pressure, thus making it an ideal material for residential, commercial, and industrial piping and fire sprinkler systems.

Applications of CPVC

CPVC is widely used in,

  • Hot & Cold Water Plumbing Pipes and Fittings
  • Pipes and Fittings for Fire Sprinkler Application
  • Sheets and Rods for Industrial Applications
  • Automotive Parts
  • Other Applications Requiring High Strength at Elevated Temperatures.

CPVC pipes are ideal for hot and cold water distribution in residential and industrial projects. They are used to carry drinking water and food liquids and are also used in water treatment plants.

CPVC pipes are used in industrial plumbing for chemicals. They are used in the transportation of chemicals and hot corrosive fluids that includes a wide range of inorganic acids, bases used in the chemical processing.

CPVC Pipes

How is CPVC made?

Each step in making CPVC is critical. From raw material to PVC, PVC to CPVC, from CPVC to finished product. In the first step, petroleum is put in a cracker and then ethylene is extracted from it. Manufacturers then react to the two chemicals chlorine and ethylene to form a new liquid chemical known as ethylene dichloride.

The EDC is dehydrated through an oxychlorination process and is ultimately broken down into Vinyl chloride monomer (VCM) .Then VCM is then polymerized in a high-pressure reactor to form Polyvinyl chloride. Then PVC resin is manufactured. The PVC is then subjected to the chlorination process.

Polyvinyl chloride is chlorinated through a free radical chlorination reaction. CPVC is then produced by adding chlorine to PVC in a fluidized bed chlorination process. The chlorination process is then initiated by ultraviolet light. The CPVC is compounded with the necessary ingredients and is further processed. Because of extra chlorination CPVC is suitable for hot water plumbing systems.

CPVC Pipes
CPVC Pipes


Physical Properties of CPVC


Specific Gravity ASTM D 792 23°C 1.55 1.55
Specific Volume 23°C 0.645 Cm3 / g 0.645 Cm3 / g
Water Absorption ASTM D 570 23°C +0.03% +0.03%
100°C +0.55% +0.55%
Rockwell Hardness ASTM D785 23°C 119
Cell Class ASTM D 1784 23447
Izod Impact ASTM D 256 23°C 1.5 ft lbs/in o.n. 80 j/m o.n.
Tensile strength ASTM D 638 23°C 8000 psi 55 N/mm2
Tensile Modulus ASTM D 638 23°C 360,000 psi 2500 N/mm2
Flexural Strength ASTM D 790 23°C 15,100 psi 104 N/mm2
Flexural Modulus ASTM D 790 23°C 415,000 psi 2860 N/mm2
Compressive strength ASTM D 695 23°C 10,100 psi 70 N/mm2
Compressive Modulus ASTM D 695 23°C 196,000 psi 1350 N/mm2
Coefficient of Thermal Expansion ASTM D 696 6.1×10-5 m/m/k
Thermal Conductivity ASTM C 177 0.14 Wm/k/m2
Heat Distortion Temperature ASTM D 648 103° c
Heat Capacity DSC 23°c 0.90 j/gk
100°c 1.10 J/gk.
Flammability Rating UL 94 0.062 in/0.157cm V-0 , 5VB , 5VA
Flame Speed ASTM E84 15
Smoke developed ASTM E84 70-125
Limiting Oxygen Index ASTM D 2863 60%
Dielectric Strength ASTM D 147 1250 V/mil 4,92000 V/cm
Dielectric Constant ASTM D 150 60 Hz,-1°c 3.7 3.7
Power Factor ASTM D 150 1000 Hz 0.007 % 0.007 %
Volume Resistivity ASTM D 257 23°c 3.4×1015 ohm/cm 3.4×1015 ohm/cm

Main Features and Benefits of CPVC


CPVC has the ability to self-extinguish and does not catch fire when exposed to fire because of the high limiting oxygen index (i.e. 60). It does not burn but turns carbonized black when heat is applied.

Resistance to scaling

CPVC has a smooth inner surface. Hence C factor is very high as compared to Copper, Steel & GI (i.e. 150). Higher C value means less friction, less head loss and no scaling.

Corrosion Resistance

CPVC is resistant to corrosion, rust and tube clogging. CPVC is resistant to chemicals like acids, bases, salts and halogens.

NSF Approved

CPVC is non toxic and antibacterial.Certified by NSF. Hence it is suitable for potable water systems.

Easy Installation

Simple solution jointing system. No special tools required for jointing. Easy repairable/modifiable after installation.

Fool-Proof Jointing

Solvent Cement used for CPVC jointing & the process called Cold Welding Process.

Tough, Rigid Material

CPVC has much higher strength than other thermoplastic used in plumbing applications. Hence it requires less support, no snaking, suitable for vertical plumbing & high pressure bearing capacity.

Low Thermal Expansion & Contraction

Less expansion of CPVC pipe when hot water runs. Hence less expansion loop required & less looping & snaking.

Lower Heat Loss

CPVC has low thermal conductivity and possesses excellent warming and cooling effects with no condensation.

UV Resistant

CPVC plumbing system has very good UV resistant property. Hence limited to a surface discoloration, no breakdown of polymer chain, no significant loss in pressure bearing capacity. For further protection apply a single coat of water base paint if it is exposed to sunlight.

Effect of Chlorine

Chlorine, a commonly used chemical to treat water in India is corrosive in nature. CPVC is unaffected by chlorine in water supply.

No Leaching

Additives in CPVC material do not migrate into water even after a long period of water stagnation.

Quieter System

Very Low noise effect due to water hammer effect. Much quieter than the metallic system.

For information regarding CPVC Pipes and fittings get in touch with us. Give a call to Ajay Pipes experts in the Toll Free No. 1800 11 4050 or send an email to info@ajaypipes.com.

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