Application-Specific Flexibility for Pneumatic Lines
The Festo PUN-H-4X0,75-BL-25 tubing (manufacturer ID 8205512) is a 4 mm outside diameter polyurethane-based line engineered for demanding pneumatic circuits. Its blue color aids quick identification during installation and maintenance. With an inside diameter of 2.6 mm and a minimum bending radius of 8 mm, this tubing can be routed in tight spaces without kinking, while the 16 mm bending radius relevant for flow rate ensures minimal pressure loss in dynamic applications. The material is TPE-U (ether-based), which provides excellent flexibility and durability, making it suitable for energy chains where repeated motion occurs.
Pressure and Temperature Performance
Operating pressure varies with temperature, a critical factor for engineers selecting tubing for variable thermal environments. The tubing can handle up to 145 psi when temperature-dependent, but the safe range across the entire temperature span is -13.775 psi to 87 psi. This means that at elevated temperatures, derating is required. The ambient temperature range is -35°C to 60°C, allowing use in cold storage or near heat sources, provided pressure is adjusted accordingly. For water applications, the maximum pressure is 0.3 MPa at 0–60°C, as noted in the technical documentation. Always consult the pressure-temperature diagram for your specific operating conditions.
Compliance and Industry Suitability
This tubing is hydrolysis-resistant, making it reliable in moisture-laden environments such as food processing or battery production. It is certified by the German Technical Control Board (TüV) under certificate B 013277 0506 00, confirming its quality and safety. The material meets UL94 HB flammability standards and is RoHS-compliant. For food industry use, it meets the necessary supplementary material requirements, though you should verify specific food contact regulations for your application. Additionally, the tubing conforms to VDMA24364-B2-L for LABS (PWIS) compatibility, which is essential in paint and coating processes to avoid surface contamination.
Integration and Connection Details
The PUN-H-4X0,75-BL-25 is designed for plug connections with 4 mm outside diameter fittings, or for barbed fittings with an inside diameter of 3 mm when used with a union nut. This versatility simplifies integration into existing pneumatic systems. The tubing is suitable for compressed air per ISO 8573-1:2010 [7:-:-] and for liquid water (ice-free), making it a dual-purpose line. Its Shore hardness of D 52 +/-3 provides a balance between rigidity and flexibility, ensuring secure fitting retention while allowing easy handling.
Special Considerations for Battery Production
For Li-ion battery manufacturing, this tubing is approved, but with restrictions: metals with more than 1% by mass of copper, zinc, or nickel are excluded from use. Exceptions include nickel in steel, chemically nickel-plated surfaces, circuit boards, cables, electrical plug connectors, and coils. This is crucial for maintaining purity in battery production environments. The product weight is 0.0085 kg/m, which is lightweight and contributes to reduced system inertia in moving applications. Cleanroom classification is not applicable for statically installed elements, so no ISO 14644-1 rating is provided.