Aluminum reduces flexibility
PPR-AL Stabi pipe is much stiffer than standard PPR. The aluminum layer resists bending. This reduces flexibility during installation significantly. Example: you cannot bend it by hand like standard PPR.
Minimum bending radius is larger
The aluminum layer increases the minimum bending radius. Standard PPR bends to 5x pipe diameter. Stabi pipe needs 8-10x pipe diameter. PPR-AL Stabi pipe requires more space for bends.
Why aluminum limits bending
Aluminum is a rigid metal that does not stretch. Bending requires the metal to deform plastically. The PPR layers alone cannot compensate. PPR-AL Stabi pipe resists bending force.
Risk of kinking
Hand bending can kink the aluminum layer. The metal creases permanently. This creates a weak point in the pipe. PPR-AL Stabi pipe kinks more easily than standard PPR.
Risk of delamination
Excessive bending can separate the layers. The adhesive bonds may fail. The aluminum separates from the PPR. PPR-AL Stabi pipe can delaminate if bent too sharply.
Use bending springs for support
Bending springs help prevent kinking. They support the pipe from the inside. They also support the pipe from the outside. PPR-AL Stabi pipe benefits from spring support.
Hot bending technique
Heat the pipe to 130-150°C for bending. The PPR becomes soft and pliable. The aluminum layer also becomes more flexible. PPR-AL Stabi pipe can be bent hot with caution.
Hot bending precautions
Avoid overheating the PPR material. The outer layer may burn or bubble. The adhesive may fail from excessive heat. PPR-AL Stabi pipe requires careful temperature control.
Minimum bend radius by size
20mm pipe: 160-200mm radius. 25mm pipe: 200-250mm radius. 32mm pipe: 256-320mm radius. PPR-AL Stabi pipe follows these guidelines.
Example: bending a 20mm pipe
A plumber tries to bend a 20mm Stabi pipe. He uses a bending spring to support it. The pipe bends to a 160mm radius. PPR-AL Stabi pipe bends successfully with support.
Example: using elbows instead
The plumber uses a 90-degree elbow fitting. This avoids the need to bend the pipe. The fitting provides a reliable turn. PPR-AL Stabi pipe works best with fittings.
Final bending summary
PPR-AL Stabi pipes have reduced flexibility due to the aluminum layer. The minimum bending radius is 8-10x pipe diameter. Hand bending risks kinking and delamination. Use bending springs for support. Hot bending is possible with careful temperature control. For tight turns, use standard PPR fittings. PPR-AL Stabi pipes are designed for straight runs with fittings. Example: plan your installation with these limitations in mind.
