Abrasion-resistant
NORFLEX® PUR 441 ROBOTIC GREEN
Abrasion-resistant high-pressure hose in polyurethane, fabric-reinforced with polyester reinforcement. Designed specifically for industrial robots, where the hose must follow the robot arm's movements cycle after cycle without abrading or kinking. Working pressure up to 20 bar, burst pressure up to 80 bar. Service from −35°C to +80°C. The green colour provides visual separation between multiple parallel hoses on the same robot — e.g. different colours for compressed air, coolant and hydraulics.
- Abrasion-resistant PUR
- 20 bar
- Up to 80 bar burst
- −35 to +80°C
- Robot-flexible
- Cut to length
- Drive-over + step-resistant
- Oil- and chemical-resistant
Why this hose?
NORFLEX® PUR 441 ROBOTIC GREEN is a specialist hose for industrial robots. Robots have a particular wear pattern: each movement cycle bends the hose at the same angles again and again. Standard hoses wear quickly at the specific bend points — the PUR + polyester reinforcement in this hose is chosen precisely because it tolerates this dynamic, repeated load pattern across thousands of cycles.
The green colour is not merely aesthetic. A modern robot arm carries several parallel hoses, each conveying its own medium — compressed air, coolant, hydraulics. Colour coding makes it possible to tell them apart without following each one from end to end. NORRES supplies the ROBOTIC range in black, blue, red and green for exactly that reason. There is no common industry standard for which colour belongs to which medium, so the coding scheme is something each plant defines and documents for itself.
Where it is used
On industrial robots the hose runs its full length along the robot arm's joints, with permanently fitted couplings at each end. It follows the arm’s movements and has to pull and push without losing integrity — hence the high burst pressure relative to the working pressure.
On assembly line robots in the automotive and machinery industries it sits in welding, painting and assembly cells, where cycle frequency is high and production often runs in shifts. How long it lasts depends on cycle frequency, bend radius, medium and temperature. NORRES states no service life, so it has to be established from experience in each installation.
The manufacturer also specifies the hose for cooling water lines and injection mould cooling, for compressed air and water, as a high-pressure spray hose in agriculture and as an inner hose in heated hose assemblies. The outer cover is weld-spatter resistant, which makes it suitable for welding cells and for hose packages on welding robots.
Beyond robotics, NORRES lists the sectors agriculture, printing, environmental and cleaning technology, welding, and pump and compressor manufacturing.
In everyday talk we call it a "robot hose" or "PUR robotic" — the green colour is the first thing you recognise when walking through a robot setup.
Technical specifications
Technical specifications for NORFLEX® PUR 441 ROBOTIC GREEN.
| Material | Pre-PUR® (premium polyurethane), polyester inlays |
|---|---|
| Colour | Green |
| Inner diameter | 9.4–19.5 mm |
| Working pressure | 20 bar |
| Burst pressure | 80 bar — 75 bar at 16 mm and 50 bar at 19.5 mm |
| Temperature | −35 to +80°C |
| Abrasion resistance | Robot-grade (cyclic dynamic) |
| Construction | Fabric-reinforced wall, smooth inside and out |
| Resistance | Abrasion-resistant outer cover; good resistance to oil, petrol and chemicals |
| Conveying media | Gas, dust, liquid, solid |
| Conformity | REACH, RoHS |
| Cut to length | Yes |
| Manufacturer SKU group | 4410404 |
Construction
The NORFLEX® construction as specified by the manufacturer. The cross-section shows how the wall is built up.
- Fabric-reinforced wall construction. The polyester inlays absorb the pressure and keep the hose dimensionally stable under repeated bending.
- Smooth inside and out. The wall is made from special premium polyurethane (Pre-PUR®). The smooth bore gives low pressure loss, and the smooth outer surface is abrasion-resistant, drive-over safe and step-resistant.
Dimensions and ordering
Standard dimensions for NORFLEX® PUR 441 ROBOTIC GREEN. Working pressure is 20 bar in all dimensions. Burst pressure is 80 bar — except 75 bar at 16 mm and 50 bar at 19.5 mm.
| Inner Ø |
Outer Ø |
Wall thickness |
Working pressure |
Burst pressure |
Bend radius |
Max. length |
Weight |
Roll |
Minimum quantity |
Article no. |
|---|---|---|---|---|---|---|---|---|---|---|
| 9.4 | 16 | 3.3 | 20 | 80 | 55 | 68 | 0.19 | 50 | 50 | 44190940404 |
| 12.5 | 19.5 | 3.5 | 20 | 80 | 69 | 105 | 0.211 | 50 | 50 | 44191280404 |
| 16 | 24.5 | 4.25 | 20 | 75 | 117 | 50 | 0.32 | 50 | 2,700 | 44191600404 |
| 19.5 | 28.5 | 4.5 | 20 | 50 | 140 | 50 | 0.44 | 50 | 50 | 44191900404 |
Fields without a value (—) are not specified in the manufacturer's factsheet. Overpressure and underpressure values are recommended operating limits; the product can be subjected to higher loads on request. Bend radius is measured along the inside of the hose bend. Minimum quantity is the manufacturer's smallest production order: 16 mm requires 2,700 m. This dimension is not a stock item; contact us for current availability.
Standards and compliance
NORFLEX® PUR 441 ROBOTIC conforms to:
- REACH (EC 1907/2006). The manufacturer's REACH declaration is available for download.
- RoHS. Directive 2011/65/EU.
Documentation and downloads
Additional documents about this hose, its compliance and installation. Click to download as PDF in a new tab.
Help with material selection
Although this hose isn't ATEX-relevant, these two articles provide useful background on electrical resistance and industrial safety — important if you later combine the hose with electrical equipment or work in mixed environments:
The invisible weakest link
Why a conductive or antistatic hose isn't sufficient on its own — and what grounding means for the complete system.
Know your ohm
The difference between antistatic and conductive, which resistance limits apply where, and how to measure them correctly.
Industries that use it
NORFLEX® PUR 441 ROBOTIC is used across industries where robots play a central role:
In the automotive industry it's standard on assembly line robots — particularly in welding, painting and assembly cells where cycle frequency is high and lifetime is critical for production uptime.
In general mechanical engineering and automation it's used on pick-and-place robots, palletising facilities and packaging lines. Colour coding is important here because maintenance personnel must quickly identify which hose carries which medium.
Custom lengths and assemblies
The hose is delivered on 50 m rolls. We cut to length and fit high-pressure fittings (typically threaded or bayonet) as a finished assembly — important for robot applications where 20 bar working pressure is the norm.
For serial deliveries we can establish identical lengths and couplings across all robot cells in an installation.
Frequently asked questions
Why is it green?
Colour coding on robot hoses lets maintenance staff see at a glance which hose carries which medium, without following it from end to end. The ROBOTIC range comes in black, blue, red and green so parallel hoses can be kept apart. There is no common standard for what the individual colours mean — each plant defines and documents its own coding scheme.
What's the difference between ROBOTIC and standard NORFLEX® PUR 441 FOOD?
ROBOTIC is specialised for dynamic cyclic load on robot arms — that's why the PUR + polyester reinforcement is optimised for flexibility and abrasion resistance under repeated bending. The FOOD variant is food-grade and prioritises microbe resistance and hygiene. Choose ROBOTIC for pneumatics/hydraulics on robots; choose FOOD for food production.
How long is the lifetime in a robot?
It depends on cycle frequency, bend radius, medium and temperature, and NORRES states no service life for the hose. It has to be established from experience in your own installation. The hose should be inspected regularly for signs of wear — surface cracks, fraying of the reinforcement, changed stiffness — and replaced proactively before it fails. Robot downtime typically costs more than preventive maintenance.
Does it tolerate 80 bar continuously?
No. 80 bar is the burst pressure — the point at which the hose fails mechanically. The working pressure (continuous) is 20 bar. Burst pressure equals 4× the working pressure at 9.4 and 12.5 mm. It drops to 75 bar (3.75×) at 16 mm and 50 bar (2.5×) at 19.5 mm. The margin covers pressure peaks, not sustained operation above 20 bar.
Is it food-grade?
No. The ROBOTIC variants are not food-grade. If you need food contact, choose the NORFLEX® PUR 441 FOOD variant instead.
Can I get it with specific couplings?
Yes. We cut to length and fit high-pressure fittings — typically threaded (BSP, NPT) or standard bayonet couplings. For specific robot brand couplings (e.g. ABB, Fanuc, KUKA, Universal Robots) we can adapt to the specific standard coupling scheme.