Abrasion-resistant · Abrasion-resistant
NORPLAST® PUR 385 Airflex® AS
Abrasion-resistant suction and pressure hose in polyurethane, antistatic and flexible. Broad application range from granulate transport via sweepers and cable protection to feed handling. Antistatic wall with surface resistance approximately 10⁹ Ω. From the manufacturer's NORPLAST family — a PUR construction that covers many industrial applications where moderate wear combines with the need for static dissipation.
- Antistatic ~10⁹ Ω
- Abrasion-resistant PUR wall
- Highly flexible
- Gas, dust, solid
- Up to +70 °C
- Cut to length
Why this hose?
NORPLAST® PUR 385 Airflex® AS is a versatile industrial hose. Abrasion-resistant PUR construction combines with antistatic wall (~10⁹ Ω) — covering a broad part of industrial applications where moderate wear and static dissipation are combined needs.
The hose is not formally ATEX-marked but meets the NFPA 652 thresholds for antistatic components. It functions as an ESD element in grounded systems.
Where it is used
In practice 385 AS is seen on sweepers, municipal vehicles, cable protection and granulate pneumatics.
The formal product name is NORPLAST® PUR 385 Airflex® AS. In daily use: "NORPLAST AS" or "385 AS".
Technical specifications
Specifications are current as of 15 April 2026 and refer to 20 °C unless otherwise stated.
| Material | Polyurethane (PUR), permanently antistatic |
|---|---|
| Colour | Black |
| Wall construction | Spiral-reinforced PUR |
| Temperature range | −20 °C to +70 °C |
| Short-term peak | +80 °C |
| Electrical resistance | Antistatic wall ~10⁹ Ω (NFPA 652 threshold) |
| Cut to length | Yes |
| Manufacturer SKU (model group) | 4604 |
Dimensions and ordering
The table shows the main variants from the manufacturer's factsheet. Fields without a value (—) are not specified. Diameters, pressure values and bend radii are normative; weights and roll lengths are typical production values.
| Inner Ø |
Outer Ø |
Wall thickness |
Working pressure |
Vacuum |
Bend radius |
Max. length |
Weight |
Roll |
Article no. |
|---|---|---|---|---|---|---|---|---|---|
| 20 | 25.6 | 0.5 | 1 | 0.25 | 15 | 20 | 0 | 10, 20 | 4604020000 |
| 25 | 30.8 | 0.5 | 1 | 0.25 | 17.5 | 20 | 0.175 | 20 | 4604025000 |
| 30 | 35.8 | 0.5 | 0.9 | 0.25 | 20 | 20 | 0.21 | 20 | 4604030000 |
| 32 | 37.8 | 0.5 | 0.85 | 0.2 | 19 | 20 | 0.225 | 10, 20 | 4604032000 |
| 35 | 41 | 0.5 | 0.8 | 0.2 | 27.5 | 20 | 0.23 | 10, 20 | 4604035000 |
| 38 | 44 | 0.5 | 0.75 | 0.2 | 31 | 20 | 0.3 | 10, 20 | 4604038000 |
| 40 | 46 | 0.5 | 0.75 | 0.2 | 40 | 20 | 0.325 | 10, 20 | 4604040000 |
| 45 | 51.2 | 0.5 | 0.65 | 0.2 | 42.5 | 20 | 0.35 | 20 | 4604045000 |
| 51 | 57.8 | 0.5 | 0.5 | 0.2 | 45 | 20 | 0.4 | 10, 20 | 4604050000 |
| 60 | 68.6 | 0.5 | 0.5 | 0.16 | 50 | 20 | 0.5 | 10, 20 | 4604060000 |
| 65 | 74.4 | 0.5 | 0.45 | 0.16 | 48.5 | 20 | 0.525 | 20 | 4604063000 |
| 70 | 79.6 | 0.6 | 0.4 | 0.16 | 60 | 20 | 0.7 | 20 | 4604070000 |
| 76 | 85.8 | 0.6 | 0.375 | 0.16 | 65 | 20 | 0.725 | 10, 20 | 4604075000 |
| 80 | 90 | 0.6 | 0.35 | 0.16 | 70 | 20 | 0.76 | 20 | 4604080000 |
| 90 | 100.2 | 0.6 | 0.3 | 0.14 | 80 | 20 | 0.8 | 20 | 4604090000 |
| 102 | 112.6 | 0.6 | 0.28 | 0.13 | 90 | 20 | 1.075 | 10, 20 | 4604100000 |
| 127 | 138.6 | 0.6 | 0.25 | 0.1 | 107.5 | 20 | 1.425 | 20 | 4604125000 |
| 130 | 141.4 | 0.6 | 0.2 | 0.09 | 105 | 20 | 1.45 | 20 | 4604130000 |
| 152 | 164 | 0.6 | 0.18 | 0.08 | 125 | 20 | 1.85 | 20 | 4604150000 |
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.
Standards and compliance
The hose is certified or documented to the following standards:
- ISO 8031. Measurement of electrical resistance.
- NFPA 652. Antistatic classification.
- REACH (EC 1907/2006) and RoHS 2011/65/EU. The manufacturer holds declarations of compliance.
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
If you are choosing a hose and are uncertain about the right resistance level or zone classification, these two articles are a good place to start:
Industries that use it
The hose is used across industries where moderate wear and antistatic wall are combined needs:
Textile, agricultural, construction and municipal industries use the hose for a broad range of industrial applications from granulate pneumatics to sweepers.
Custom lengths and assemblies
The hose can be cut to length and assembled with couplings, cuffs and threaded fittings through Particulair's custom hose assemblies.
We offer guidance on material choice, coupling system and grounding, so the hose fits correctly into the overall system. If there is any doubt about zone classification or resistance requirements, a short conversation before ordering is well worth the time.
Frequently asked questions
Is it ATEX-approved?
Not formally. The hose is antistatic and meets the NFPA 652 thresholds, but the factsheet does not list an explicit ATEX 2014/34/EU marking. For ATEX zones with documented approval, choose an AIRDUC® AS or EC variant.
Can the hose be supplied cut to length with couplings?
Yes. NORPLAST® PUR 385 Airflex® AS can be cut to length and assembled with couplings, cuffs and threaded fittings through Particulair's custom hose assemblies. We provide guidance on coupling system and sealing so the hose fits correctly into the overall installation.
How do I order the hose, and where do you deliver?
The hose is ordered through Particulair (Karlslunde, Denmark). We deliver to Denmark, the EU and selected third countries such as Norway and Switzerland. Standard dimensions can typically be delivered in 1-2 weeks; custom assemblies and larger volumes require slightly longer lead time.
What is the hose's expected service life?
Service life depends on operating conditions: loading, temperature, chemical exposure, UV and mechanical movement. In standard industrial use, expected life is 3-7 years. Aggressive conditions (high temperatures, continuous flexing, chemical vapours) reduce service life. We recommend regular visual inspection for cracks, deformation or discolouration.
How is the hose best stored before use?
Store the hose dry, at room temperature (15-25 °C) and out of direct sunlight. Avoid contact with ozone-generating equipment (welding equipment, engines). If stored on a reel, the bend must be larger than the specified minimum radius to avoid permanent deformation. Proper storage significantly extends shelf life.
What is the minimum bend radius, and what happens if I go below it?
Minimum bend radius is the smallest radius the hose can be bent to without permanent deformation or internal damage. The table above shows specific values for each dimension. Bending the hose below this limit can collapse the wall, kink the spiral or damage the inner coating. The result is reduced flow, increased pressure loss and shorter service life. Always use bend radius as a design constraint in installation.
Does the hose need to be grounded to function as an ESD component?
Yes, proper grounding is a prerequisite. The antistatic or conductive wall only dissipates static electricity if the hose is connected to ground at both ends — typically via grounded couplings on machine and tank. Without grounding, the electrical property has no practical effect and the ATEX approval is not valid in practice. We always recommend measuring loop resistance after installation.
What is the difference between an antistatic (AS) and an electrically conductive (EC) hose?
AS hoses have surface resistance between 10⁶ and 10⁹ Ω and are antistatic but not fully conductive. EC hoses have resistance below 10⁶ Ω and actively conduct static electricity to ground. For Zone 22 (dust) and Zone 1/2 (gases) AS is typically sufficient. For Zone 20 and Zone 0 — the strictest classes — EC is required. See our article "Know your ohm" for a review of the resistance classes.