PU Tubing vs. Nylon Tubing: Selection Fundamentals

The main difference between PU tubing and Nylon tubing lies in whether the tubing needs to move with the equipment:

If movement or repeated bending is required → Use PU tubing
If the tubing remains fixed or stable → Use nylon tubing

In pneumatic systems, tubing selection affects routing configuration and overall operational stability. Among commonly used pneumatic tubing, PU tubing and Nylon tubing (Polyamide, PA) represent two materials with different characteristics.

These two types of tubing are not interchangeable, but should be selected based on how the tubing is used and the operating conditions. The key factor in selection is how the tubing is used, rather than a comparison of material properties alone.

→ What Is PU Tubing? (Material Properties and Application Fundamentals)

Differences in Material Characteristics Between PU and Nylon Tubing

In pneumatic tubing selection, the differences between PU and Nylon tubing are primarily reflected in routing behavior rather than a direct comparison of material properties.

Characteristics and Usage of PU Tubing

PU tubing is characterized by high flexibility and is suitable for routing configurations that involve movement.

• Good flexibility, capable of repeated bending
• Good abrasion resistance, suitable for applications involving contact with equipment surfaces
• Suitable for routing configurations with frequent directional changes
• Commonly used in end-of-line or dynamic sections of equipment

When tubing is required to move with equipment operation, PU tubing is generally the preferred selection.

Characteristics and Usage of Nylon Tubing

Nylon tubing has a relatively stable structure and is suitable for fixed or less frequently changing routing configurations.

• Good dimensional stability, suitable for fixed routing paths or long-distance installations
• Suitable for applications where tubing does not require frequent movement after installation
• Commonly used in main trunk lines or fixed sections of equipment

Nylon tubing commonly includes PA6 and PA12. In general, PA12 has lower moisture absorption and maintains more stable dimensions under changing environmental conditions. Actual material selection should still be based on specific operating requirements.

PU vs. Nylon Tubing Comparison

What Situations Are Suitable for PU Tubing?

When tubing needs to move with equipment or undergo repeated bending during operation, PU tubing is commonly selected.

Typical situations:

• Tubing follows moving components (such as robotic arms or sliding mechanisms)
• Tubing requires continuous bending during operation
• Routing paths are complex
• Tubing may come into contact with equipment surfaces

Under these conditions, PU tubing is more suitable for applications involving movement.

→ Learn more about the characteristics and applications of PU tubing

What Situations Are Suitable for Nylon Tubing?

When tubing remains mostly stationary after installation or when stable routing needs to be maintained, nylon tubing is commonly used.

Typical situations:

• Tubing is used in main trunk lines or long-distance routing
• No frequent movement is required after installation
• Routing direction needs to be maintained
• The operating environment involves temperature or humidity changes

Under these conditions, nylon tubing is more suitable for applications requiring stable routing.

→ Learn more about the characteristics and applications of Nylon tubing

How PU and Nylon Tubing Are Used Together in the Same System

In actual systems, PU tubing and nylon tubing are often used together rather than selecting only one type.

Common configurations:

• Main trunk lines: nylon tubing (fixed)
• End-of-line or moving sections: PU tubing (dynamic)

This type of configuration balances system stability and operational flexibility.

How to Decide Between PU and Nylon Tubing

When selecting pneumatic tubing, the following guidelines can be used for quick evaluation:

• If the tubing needs to move → use PU tubing
• If the tubing remains fixed → use nylon tubing
• If the system includes both moving and fixed sections → use both

Tubing selection should primarily be based on how the tubing is used, rather than only comparing material properties.

PU vs. Nylon Tubing FAQ

What is the difference between PU tubing and Nylon tubing?

The main difference between PU tubing and Nylon tubing lies in whether the tubing needs to move. PU tubing is suitable for dynamic applications requiring flexibility and repeated bending, while nylon tubing is more suitable for fixed configurations that require dimensional stability.

Should I choose PU tubing or Nylon tubing for pneumatic systems?

The most direct way to decide is whether the tubing needs to move. If movement or flexible routing is required, PU tubing is typically used; if the tubing is fixed and requires stable configuration, nylon tubing is generally preferred.

Can PU tubing replace Nylon tubing?

Whether PU tubing can replace Nylon tubing depends on the application conditions. PU tubing is used for dynamic routing, while nylon tubing is used for fixed configurations, and the two are not always directly interchangeable.

Can Nylon tubing be used in moving applications?

Nylon tubing can be used in low-frequency or small-range dynamic applications. However, under conditions involving continuous or repeated bending, it is generally not recommended as the primary choice.