PUN-H-4X0,75-BL Festo Plastic Tubing

Technical Overview

The Festo PUN-H-4X0,75-BL is a high-performance blue plastic tubing engineered from ether-based TPE-U (polyurethane), ensuring excellent hydrolysis resistance. Designed for versatility, it is suitable for both compressed air and liquid water applications, and its construction allows for use in energy chains. It meets various industry standards, including UL94 HB fire testing and VDMA24364-B2-L LABS conformity, while being specifically rated for battery production and food-related environments under certain conditions.

Key Features

Suitable for energy chains
Hydrolysis resistant (Ether based)
RoHS-compliant material
Suitable for battery production with reduced Cu/Zn/Ni values
Suitable for use with food (see supplementary material information)
Highly flexible with a minimum bending radius of 8 mm
Compatible with push-in connectors and barbed fittings

Technical Specification Matrix

Parameter	Value
Outside diameter	4 mm
Flow-relevant bending radius	16 mm
Inside diameter	2.6 mm
Min. bending radius	8 mm
Instructions on use	TPE-U Ether based
Tubing characteristics	Suitable for energy chains
Operating pressure complete temperature range (MPa)	-0.095 MPa ... 0.6 MPa
Operating pressure complete temperature range (bar)	-0.95 bar ... 6 bar
Operating pressure complete temperature range (psi)	-13.775 psi ... 87 psi
Temperature-dependent operating pressure (MPa)	-0.095 MPa ... 1 MPa
Temperature-dependent operating pressure (bar)	-0.95 bar ... 10 bar
Temperature-dependent operating pressure (psi)	-13.775 psi ... 145 psi
Note on operating pressure	Water: temperature-dependent operating pressure, see diagram, max. 0.3 MPa at 0–60 °C
Approval	German Technical Control Board (TÜV)
Certificate issuing authority	B 013277 0527 00
Operating medium	Compressed air to ISO 8573-1:2010 [7:-:-] Water (liquid, ice-free)
Fire test material	UL94 HB
LABS (PWIS) conformity	VDMA24364-B2-L
Suitability for the production of Li-ion batteries	Suitable for battery production with reduced Cu/Zn/Ni values (F1a)
Cleanroom suitability	Element installed statically, no meaningful evaluation possible according to ISO 14644-1
Suitable for use with food	See supplementary material information
Ambient temperature	-35 °C ... 60 °C
Product weight according to length	0.0085 kg/m
Pneumatic connection	For push-in connector O.D. 4 mm, For push-in connector outside diameter of 5/32", For barbed fitting I.D. 3 mm with union nut
Colour	Blue
Shore hardness	D 52 +/-3
Note on materials	RoHS-compliant
Material tubing	TPE-U(PU)

Industrial Applications

1. Robotic End-Effector Pneumatics in Li-Ion Battery Cell Assembly

The 4mm polyurethane tubing is routed through continuous-flex energy chains on automated robotic arms to supply compressed air to pneumatic grippers handling sensitive lithium-ion battery cells.

Problem Solved

Eliminates the risk of cell chemistry contamination from heavy metals during automated assembly, while ensuring high-cycle mechanical reliability in fast-moving drag chains where rigid hoses would fatigue or kink.

Suitable for battery production with reduced Cu/Zn/Ni values (F1a)Suitable for energy chainsFlow-relevant bending radius 16 mmTPE-U(PU) material10 bar maximum temperature-dependent pressure

2. Vacuum Suction Lines for Washdown Food Packaging Delta Robots

Utilized as flexible vacuum delivery lines connected to suction cups on high-speed delta robots performing pick-and-place operations in wet food-processing and packaging environments.

Problem Solved

Prevents tubing degradation and cracking caused by moisture exposure (hydrolysis) in washdown zones, while effectively holding the deep vacuum required for reliable high-speed suction cup actuation.

Operating pressure -0.95 bar (vacuum)TPE-U Ether basedSuitable for use with foodHydrolysis-resistantOutside diameter 4 mm

3. Compact Water Cooling Circuits for Precision Automation Tooling

Serves as low-pressure liquid cooling feed and return lines routed through the highly confined mechanical housings of automated machinery, such as precision laser-cutting or welding heads.

Problem Solved

Enables the safe and reliable delivery of water-based coolant through extremely tight spatial constraints and sharp corners without flow-restricting kinks or structural failure.

Operating medium: Water (liquid, ice-free)Min. bending radius 8 mmMax 0.3 MPa operating pressure at 0–60 °CInside diameter 2.6 mmAmbient temperature -35 °C ... 60 °C