ATEX/ESD · Antistatic
AIRDUC® PUR 356 AS (XHD)
Extra heavy-duty antistatic polyurethane hose (XHD wall, 1.8 mm) for extremely abrasive media in ATEX zones. The construction is DIN 26057 Type 4 — the highest abrasion class in the AIRDUC family — and the hose is built for applications where an HD construction does not last long enough. The antistatic surface (<109 Ω) meets TRGS 727 + NFPA 652, and it is flame-retardant per UL94-V2 + DIN 4102-B1.
- Antistatic <109 Ω
- ATEX Zone 20/21/22
- Abrasion-resistant PUR wall
- Highly flexible
- Gas, dust, granulate
- Cut to length
Why this hose?
AIRDUC® PUR 356 AS (XHD) is the top tier of the AIRDUC family where abrasion loading is the dominant selection criterion. Wall thickness is 1.8 mm — nearly twice that of 350 AS (MD) and 30-50 % thicker than 355 AS (HD). That means markedly longer service life when conveying glass beads, sand, metal chips, construction-site debris and similar extreme media.
As with the other AS variants, the hose carries an antistatic level (<109 Ω), a flame-retardant formulation and broad ATEX approval (Zone 0/1/2 gas, Zone 20/21/22 dust). It is classified to DIN 26057 Type 4, where MD is Type 2 and HD is Type 3. It is still an antistatic hose — not fully conductive. For Zone 0/20 applications an EC variant should be selected instead.
Weight and flexibility are the practical trade-off: the XHD wall is heavier and less flexible than the thinner variants. That means 356 AS (XHD) is not the first-pick choice on mobile applications; it lives its life in central systems where service life against wear is the dominant parameter — and 356 delivers exactly that.
The hose is one part of a system. ATEX approval requires that the whole system is correctly grounded, and that the resistance through the entire chain (hose, couplings, connections and machine) is low enough to conduct static electricity away. A hose with antistatic or conductive wall in a system without correct grounding gives a false sense of security.
We always recommend a continuity resistance measurement after installation. Read more about the weakest link in an ESD chain.
Where it is used
The hose is used in pneumatic transport of powders and granulates in chemical process plants, plastics industry, food factories and pharma production — wherever combustible dust is present in ATEX zones.
Typical systems include central extraction installations, filling and dosing stations, and pneumatic transport systems between silos and process reactors. ATEX approval is required for installation in Zone 21 and 22.
In plastics industry, chemical industry, printing industry the hose is part of an overall grounded system. Correct grounding is critical — without grounding, the antistatic property does not function in practice.
The formal name is AIRDUC® PUR 356 AS (XHD). In daily use it is referred to as "the XHD hose" or "the extra-thick-walled AS hose" — it is typically selected after an HD construction has proven insufficient in the actual service.
Technical specifications
Specifications are valid as of 2026-04-15. Fields without a value are not specified in source data.
| Material | Polyurethane (PUR), reinforced construction |
|---|---|
| Colour | Transparent / light grey |
| Wall construction | Extra heavy-duty PUR wall with double thickness and embedded steel spiral |
| Conveyed media | Gas, dust, granulates and particles |
| Temperature range | −40 °C to +90 °C |
| Short-term peak | +125 °C |
| Smooth surface | Smooth interior |
| Electrical resistance | Antistatic wall with surface and electrical resistance <109 Ω. Method: EN 60079-32-1, < 10⁹ Ω; surface resistivity < 2,5 × 10⁸ Ω·m (TRGS 727) |
| ATEX marking | II 2D (interior zone 20/21/22, exterior zone 21) — antistatic per TRGS 727 |
| Cut to length | Yes — Particulair cuts the hose to your dimensions |
The hose is approved for internal transport of combustible dust in zone 20/21/22. Correct grounding is a prerequisite for the antistatic or conductive property to function in practice. We always recommend a continuity resistance measurement after installation.
Dimensions and ordering
AIRDUC® PUR 356 AS (XHD) is supplied in 39 standard sizes from inner Ø 32 mm to 300 mm. Each size has its own article number at the manufacturer. Standard roll length is typically 10 m, and the hose can be cut to length.
| Inner Ø |
Outer Ø |
Wall thickness |
Working pressure |
Vacuum |
Bend radius |
Max. length |
Weight |
Roll |
Article no. |
|---|---|---|---|---|---|---|---|---|---|
| 32 | 44 | 1.8 | 5.235 | 1 | 90 | 25 | 0.64 | 10, 15 | 35600320000 |
| 38 | 50 | 1.8 | 4.475 | 1 | 104 | 25 | 0.74 | 10, 15 | 35600380000 |
| 40 | 52 | 1.8 | 4.27 | 1 | 109 | 25 | 0.77 | 10, 15 | 35600400000 |
| 45 | 57 | 1.8 | 3.825 | 1 | 129 | 25 | 0.86 | 10, 15 | 35600450000 |
| 48 | 60 | 1.8 | 3.47 | 1 | 132 | 25 | 0.91 | — | 35600480000 |
| 50 | 62.5 | 1.8 | 3.47 | 1 | 134 | 25 | 0.94 | 10, 15 | 35600500000 |
| 51 | 63 | 1.8 | 3.2 | 1 | 134 | 25 | 0.96 | 10 | 35600510000 |
| 55 | 67 | 1.8 | 3.17 | 1 | 151 | 25 | 1.03 | 10, 15 | 35600550000 |
| 60 | 72 | 1.8 | 2.92 | 1 | 156 | 25 | 1.1 | 10, 15 | 35600600000 |
| 63 | 75 | 1.8 | 2.81 | 1 | 163 | 25 | 1.16 | — | 35600630000 |
| 65 | 77 | 1.8 | 2.705 | 1 | 169 | 25 | 1.2 | 10 | 35600650000 |
| 70 | 83 | 1.8 | 2.52 | 1 | 186 | 25 | 1.29 | 10 | 35600700000 |
| 75 | 88 | 1.8 | 2.36 | 1 | 195 | 25 | 1.37 | 10, 15 | 35600750000 |
| 76 | 89 | 1.8 | 2.355 | 1 | 195 | 25 | 1.39 | 10, 15 | 35600760000 |
| 77 | 90 | 1.8 | 2.22 | 1 | 197 | 15 | 1.4 | — | 35600770000 |
| 80 | 93 | 1.8 | 2.22 | 1 | 205 | 25 | 1.46 | 10, 15 | 35600800000 |
| 90 | 104 | 2 | 2.195 | 1 | — | 25 | 2.08 | 10 | 35600900000 |
| 100 | 113 | 2 | 1.98 | 1 | 272 | 20 | 2.27 | 10, 15 | 35601000000 |
| 102 | 115 | 2 | 1.89 | 1 | 272 | 20 | 2.31 | 10, 15 | 35601020000 |
| 110 | 123 | 2 | 1.805 | 1 | 300 | 20 | 2.5 | 10 | 35601100000 |
| 115 | 128 | 2 | 1.73 | 0.975 | 317 | 20 | 2.61 | 10 | 35601150000 |
| 120 | 133 | 2 | 1.66 | 0.93 | 330 | 20 | 2.71 | 10 | 35601200000 |
| 125 | 138 | 2 | 1.595 | 0.895 | 336 | 20 | 2.82 | 10 | 35601250000 |
| 127 | 140 | 2 | 1.565 | 0.89 | 336 | 20 | 2.84 | 10, 15 | 35601270000 |
| 130 | 143 | 2 | 1.535 | 0.86 | 355 | 20 | 2.93 | 10 | 35601300000 |
| 140 | 152 | 2 | 1.43 | 0.8 | 395 | 20 | 3.13 | 10 | 35601400000 |
| 150 | 163 | 2 | 1.335 | 0.745 | 435 | 15 | 3.71 | 10, 15 | 35601500000 |
| 152 | 165 | 2 | 1.305 | 0.735 | 435 | 15 | 3.73 | 10, 15 | 35601520000 |
| 160 | 173 | 2 | 1.255 | 0.7 | 470 | 15 | 3.95 | 10 | 35601600000 |
| 170 | 183 | 2 | 1.18 | 0.66 | 600 | 15 | 4.18 | — | 35601700000 |
| 175 | 188 | 2 | 1.15 | 0.64 | 700 | 15 | 4.3 | 10 | 35601750000 |
| 178 | 191 | 2 | 1.12 | 0.62 | 770 | 15 | 4.37 | — | 35601780000 |
| 180 | 193 | 2 | 1.12 | 0.62 | 830 | 15 | 4.42 | — | 35601800000 |
| 200 | 214 | 2 | 1.01 | 0.56 | 950 | 15 | 5.99 | 10 | 35602000000 |
| 203 | 217 | 2 | 0.955 | 0.55 | 950 | 15 | 6.06 | — | 35602030000 |
| 225 | 239 | 2 | 0.9 | 0.495 | 1.175 | 15 | 6.71 | — | 35602250000 |
| 250 | 264 | 2 | 0.81 | 0.445 | 1.3 | 15 | 7.38 | 5 | 35602500000 |
| 254 | 268 | 2 | 0.675 | 0.375 | 1.34 | 15 | 7.55 | — | 35602540000 |
| 300 | 314 | 2 | 0.675 | 0.375 | 1.575 | 10 | 8.88 | — | 35603000000 |
Note: Fields without a value (—) are not specified in the manufacturer's factsheet. Overpressure and underpressure are recommended operating limits; the product can be subjected to higher loads on request. Bend radius is measured along the inside of the hose. Contact us for full specifications or special variants.
Standards and compliance
The hose is tested and certified to the following standards:
- ATEX 2014/34/EU (1999/92/EC). European directive for equipment and protective systems intended for use in potentially explosive atmospheres. The hose is certified under this legislation and may be used in the zones specified by the ATEX marking.
- TRGS 727. German technical rules for hazardous substances, avoidance of ignition sources when handling combustible dusts and liquids. The hose's electrical conduction meets TRGS 727's limit values.
- DIN 26057 Type 2. German industrial standard for hoses used in pneumatic transport. Defines types, dimensions, pressure and vacuum requirements, and test procedures for industrial pneumatic hoses.
- REACH (EC 1907/2006). EU regulation on registration, evaluation, authorisation and restriction of chemicals. The hose's materials are REACH-compliant; manufacturer's declaration is available for download.
- RoHS (Directive 2011/65/EU). Restriction of Hazardous Substances — restriction on the use of certain hazardous substances in electronic products. The hose's components comply with RoHS limit values.
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
When you select a conductive or antistatic hose, it is not only the hose itself that determines whether the system is safe. These two articles go in depth with two concepts that are often misunderstood, and which are crucial for understanding whether a hose actually works as intended.
The invisible weakest link
A certified hose is only as safe as the system it is part of. About why grounding is often the weakest link in an ESD chain.
Know your ohm
The difference between antistatic and conductive is about numbers. About why 106, 109 and 103 Ω matter, even when nobody talks about it.
Industries that use it
The hose is used across a wide range of industries — below is an overview of the most typical industries where AIRDUC® PUR 356 AS (XHD) is used:
In construction and mining, 356 AS (XHD) sits on central vacuum systems collecting gravel, stone, crushed glass and construction waste — applications where an HD wall is worn out in a few months. The XHD wall extends the replacement interval significantly.
In ceramic and glass industries, it is used for conveying glass particles, fillers and abrasives. In cement and concrete industries, it sits in sand and powder transfer, where the medium is both coarse and often damp. In paper and printing industries, it is used for high-volume powders.
In municipal engineering and waste, it features on vacuum trucks in contractor work and heavy sweeping vehicles. In the plastics and chemical industries, it appears on conveying lines for granulates at industrial scale. What unites these applications is that service life against wear is the dominant selection criterion; ATEX properties are mandatory background, but they are not what dictates the choice between MD, HD and XHD.
Custom lengths and assemblies
AIRDUC® PUR 356 AS (XHD) can be cut to length and assembled with couplings, cuffs and threads to fit your installation precisely. We produce complete hose assemblies with crimped ferrules, clamp collars or threaded connections, depending on what the process requires.
For ATEX installations it is particularly important that couplings and assemblies preserve the hose's electrical continuity. It's about the whole system conducting static electricity away, not just the hose itself.
Frequently asked questions
What's the difference between the AS and EC variant?
AS and EC concern electrical resistance: the AS variant is antistatic (surface resistance <10⁹ Ω), the EC variant is fully conductive (<10⁶ Ω). EC is required in Zone 20 and high-energy ESD; AS is sufficient for Zone 21 and 22.
Can the hose be used with flammable liquids?
It depends on the marking. The hose's full ATEX marking specifies which zones and which media it may be used for. Correct grounding is a prerequisite for the antistatic or conductive property to function in practice.
Is the hose flame-retardant?
Yes. The hose is specified to UL94-V2 and DIN 4102-B1 where indicated in the factsheet. This means it is self-extinguishing, but flame retardance does not replace ATEX compliance — they are two distinct safety properties.
Must the hose be grounded?
Yes, ALWAYS. The antistatic or conductive property only conducts charges if the hose is correctly grounded at both ends. Missing grounding is the most common cause of ATEX incidents.
How long does the hose last?
Service life depends heavily on the medium, flow velocity and grounding. Heavy-duty variants typically last 2-4 years under continuous operation with abrasive media; lighter variants half as long. Monthly visual inspection is recommended.