Material and Compliance Profile
The Festo PUN-H-6X1-TBL-25 (manufacturer ID 8205519) is a translucent blue pneumatic tube made from TPE-U(PU) with a Shore hardness of D 52 +/-3. Its hydrolysis-resistant formulation is a key differentiator, allowing the tube to maintain mechanical integrity in humid environments or when conveying water. The material is RoHS-compliant and carries a TÜV certificate (B 013277 0506 00), confirming its suitability for pressure applications. For food-industry use, the tube meets the requirements listed in the supplementary material information, making it a viable option for non-contact or splash-zone applications where hygiene is monitored.
Dimensional and Mechanical Data
With an outside diameter of 6 mm and an inside diameter of 4 mm, this tube is designed for standard push-in fittings and barbed connections. The minimum bending radius is 10 mm, while the radius relevant for flow rate is 26 mm, giving engineers clear guidance for routing in tight spaces without compromising performance. The tube is also rated as suitable for energy chains, which means it can withstand repeated flexing in automated machinery. Its weight of 0.0183 kg/m contributes to low added mass in moving cable carriers.
Pressure and Temperature Ratings
The operating pressure depends on temperature. For the entire ambient temperature range of -35°C to 60°C, the allowable pressure is between -13.775 psi and 87 psi. When temperature-dependent derating is applied, the upper limit rises to 145 psi, but this is only valid at lower temperatures. For water service, the maximum pressure is 0.3 MPa (approx. 43.5 psi) at 0–60°C, as indicated in the manufacturer's diagram. These ratings are essential for sizing pneumatic circuits that may see pressure spikes or operate in cold environments.
Application Considerations
This tube is approved for compressed air per ISO 8573-1:2010 [7:-:-] and for liquid, ice-free water. That dual capability makes it useful in cooling circuits, washdown stations, or humid production areas where standard polyurethane tubes might degrade. The material also meets LABS (PWIS) conformity VDMA24364-B2-L, which is a common requirement in automotive paint shops to avoid silicone contamination. For lithium-ion battery production, the tube is acceptable only if the system avoids metals with more than 1% copper, zinc, or nickel by mass, except for nickel in steel or plated surfaces—so verify your fittings and connectors accordingly.
Installation and Handling
The tube is designed for plug connections with 6 mm outside diameter and for barbed fittings with 4 mm inside diameter using a union nut. This flexibility allows quick assembly with standard Festo push-in connectors or alternative barbed systems. The translucent blue color aids in visual inspection of flow or contamination. The material fire test rating is UL94 HB, indicating a horizontal burn test classification, which is typical for many industrial tubes. For cleanroom use, the tube is considered a statically installed element, so no meaningful particle emission classification can be assigned per ISO 14644-1.