Product Overview
The Festo PUN-H-8x1.25-TBL-25 (MPN: 8205520) is a translucent blue polyurethane tubing engineered for pneumatic systems that demand both flexibility and durability. With an outside diameter of 8 mm and an inside diameter of 5.7 mm, this tubing strikes a balance between compact routing and adequate flow capacity. Its TPE-U (ether-based) construction provides resistance to chemicals and abrasion, making it a practical choice for automated machinery, material handling, and packaging equipment where repeated motion and exposure to industrial media are common.
Technical Performance and Installation
The tubing’s minimum bending radius of 21 mm allows tight routing in confined spaces, while the flow-relevant bending radius of 37 mm ensures that even when curved, the internal cross-section remains largely unobstructed, minimizing pressure drops. This is particularly valuable in high-cycle applications where consistent actuator response is critical. The material’s Shore hardness of D 52 ±3 contributes to dimensional stability, reducing the risk of kinking during installation or operation. For engineers designing energy chains, the tubing is explicitly rated as suitable for such dynamic applications, and its low weight of 0.0287 kg/m helps reduce inertial loads on moving assemblies.
Operating Conditions and Media Compatibility
The PUN-H-8x1.25-TBL-25 is approved for use with compressed air per ISO 8573-1:2010 [7:-:-] and with liquid, ice-free water. For compressed air, the operating pressure ranges from -13.775 psi to 87 psi across the full ambient temperature span of -35°C to 60°C. When temperature-dependent derating is applied, the tubing can handle up to 145 psi, offering flexibility for higher-pressure applications at moderate temperatures. For water service, the maximum allowable pressure is 0.3 MPa (approximately 43.5 psi) within 0–60°C, as detailed in the manufacturer’s pressure-temperature diagram. This dual-media capability simplifies inventory for facilities that use both air and water in their processes, though it is essential to verify that the fluid is ice-free to prevent damage.
Compliance and Suitability for Specialized Environments
This tubing carries TÜV certification (certificate B 013277 0506 00) and meets UL94 HB flammability requirements, providing a baseline for safety in industrial equipment. It is also LABS (PWIS) conformant to VDMA24364-B2-L, which is a key requirement for automotive paint shops where silicone contamination must be avoided. For food industry use, the tubing is hydrolysis-resistant and listed as suitable, but specifiers should consult the supplementary material information to confirm compatibility with specific cleaning agents and temperature cycles. In cleanroom settings, the tubing is considered a statically installed element, meaning no meaningful particle emission classification can be assigned per ISO 14644-1; this should be factored into cleanroom design reviews.
Integration and Connection Options
The 8 mm outside diameter is a standard size for push-in fittings, allowing direct connection to Festo and other compatible fittings. Additionally, the tubing can be used with barbed fittings having a 6 mm inside diameter when combined with a union nut, offering flexibility in retrofit or custom assemblies. The translucent blue color aids in visual line identification and allows for quick inspection of fluid presence or contamination. RoHS compliance ensures that the material meets current environmental directives, and the tubing is also noted as suitable for Li-ion battery production, provided that metals with more than 1% copper, zinc, or nickel are excluded from contact—an important consideration for battery manufacturing equipment.