IFAN Fine Quality PEX-EVOH Pipes

EVOH makes the pipe slightly stiffer

The EVOH layer adds stiffness to the pipe wall. This reduces flexibility compared to standard PEX. The pipe is still flexible enough for most installations. PEX-EVOH pipes are less flexible than standard PEX.

Bending radius is slightly larger

The bending radius of PEX-EVOH is larger than standard PEX. Standard PEX has a 5x diameter minimum radius. PEX-EVOH typically has a 6-8x diameter radius. PEX-EVOH pipe needs a wider bending radius.

EVOH thickness affects flexibility

Thicker EVOH layers reduce flexibility more. Thinner EVOH layers allow easier bending. The overall pipe design affects stiffness. PEX-EVOH pipe flexibility varies with construction.

Comparable to PEX-AL-PEX flexibility

PEX-EVOH is more flexible than PEX-AL-PEX. Aluminum is stiffer than EVOH polymer. EVOH provides a good balance of flexibility and barrier. PEX-EVOH pipe is easier to install than aluminum barrier pipes.

Bending springs are helpful

Use bending springs to prevent kinking. They support the pipe during bending. They reduce the risk of damage. PEX-EVOH pipe benefits from bending spring use.

Minimum bend radius by size

20mm pipe: 120-160mm minimum radius. 25mm pipe: 150-200mm minimum radius. 32mm pipe: 192-256mm minimum radius. PEX-EVOH pipe follows these guidelines.

Example: bending a 20mm pipe

A plumber bends a 20mm PEX-EVOH pipe. He uses a bending spring for support. The pipe bends to a 150mm radius. PEX-EVOH pipe bends without kinking.

Example: standard PEX comparison

Standard PEX bends to a 100mm radius. PEX-EVOH needs a 150mm radius. The EVOH layer adds some stiffness. PEX-EVOH pipe requires more space.

Cold temperature bending

Cold temperatures make the pipe stiffer. The EVOH layer becomes less flexible. Warm the pipe slightly if needed. PEX-EVOH pipe bends better at moderate temperatures.

Hot bending technique

Heat the pipe to 50-60°C for easier bending. This softens the PEX layers. The EVOH becomes more flexible. PEX-EVOH pipe can be bent hot with caution.

Use fittings for tight turns

For tight radius turns, use fittings instead of bending. Elbows and tees provide reliable turns. This avoids stressing the pipe. PEX-EVOH pipe works best with fittings for tight spaces.

Final bending and flexibility summary

The EVOH layer increases the bending radius of PEX-EVOH pipe compared to standard PEX. The pipe is stiffer and less flexible. The minimum bending radius is 6-8x the pipe diameter. Cold temperatures reduce flexibility further. Hot bending can help in some cases. Use bending springs for support. For tight turns, use fittings instead of bending. PEX-EVOH pipe offers a good balance of barrier protection and flexibility for most installations. Example: a practical, easy-to-install pipe for heating systems.

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