PEX (cross-linked polyethylene) and PPR (polypropylene random copolymer)
pipes are commonly used in plumbing and piping systems. They differ in their
materials, properties, and applications. Here's a detailed comparison:

Material
PEX PIPE: Made from cross-linked polyethylene, which is a thermoset
material. The cross-linking process enhances its strength, flexibility, and
thermal resistance.
PPR PIPE: Made from polypropylene random copolymer, a thermoplastic
material. It has high impact resistance and is particularly resistant to
corrosion.
Flexibility
PEX PIPE: Highly flexible, allowing it to bend around corners without the
need for additional fittings. This reduces installation time and material
cost.
PPR PIPE: Rigid and less flexible. Requires fittings like elbows and joints
to navigate bends and turns.
Durability
PEX PIPE: Resistant to scale and chlorine, does not corrode or develop
pinholes, and can tolerate high and low temperatures. However, it is more
susceptible to damage from UV light and external impact.
PPR PIPE: Extremely durable, with a longer lifespan in certain conditions.
It is more resistant to physical damage and UV exposure compared to PEX.
Temperature and Pressure Resistance
PEX PIPE: Excellent thermal resistance, withstanding temperatures up to
about 200°F (93°C). It is suitable for both hot and cold water supply.
PPR PIPE: Performs well under high temperatures and pressure, typically up
to 180°F (82°C). It is widely used for hot and cold water as well as industrial
liquids.
Installation
PEX PIPE: Simple to install with fewer fittings. Requires specialized tools
for crimping or clamping connections.
PPR PIPE: Installation involves welding or fusing joints using a heat
fusion process. This creates a very strong bond but requires more time and
skill.
Cost
PEX PIPE: Generally more expensive than PPR due to the material and
manufacturing process. However, the lower labor cost for installation can offset
this.
PPR PIPE: Cheaper material cost, but the installation process can increase
labor expenses.
Applications
PEX PIPE: Widely used in residential plumbing for hot and cold water lines,
radiant heating systems, and snow melting systems.
PPR PIPE: Common in commercial and industrial applications, such as
transporting chemicals, industrial liquids, and compressed air systems, besides
being used for water supply.
Environmental Impact
PEX PIPE: Not recyclable due to its cross-linked structure. However, its
long lifespan can offset this concern.
PPR PIPE: Fully recyclable, making it a more environmentally friendly
option.
Conclusion
Choose PEX for residential plumbing, especially where flexibility and ease
of installation are priorities.
Opt for PPR for industrial or commercial applications where durability and
resistance to external impacts are critical.