AIRDUC® PUR 350 AS (MD) -- Lightweight antistatic PUR hose for pneumatic transport in ATEX zones

Why this hose?

AIRDUC® PUR 350 AS (MD) combines three properties that rarely sit in one place: an antistatic wall (<10⁹ Ω), a flame-retardant formulation (UL94-V2 and DIN 4102-B1) and a medium-duty PUR construction light enough for mobile applications while wear-resistant enough for daily industrial duty. That means it covers a wide range of industries in a single product — from wood dust and grain through plastic granulates to powders in chemical production.

The antistatic level (<10⁹ Ω) is the practical choice where a process generates flammable dust but does not require full ATEX Zone 0/20 approval. TRGS 727 is the German framework for handling flammable dust, and NFPA 652 is its American counterpart; the hose meets both. In practice that means the process is safe against electrostatic ignition in Zone 22 (dust) and Zone 1/2 (gas), provided the hose is properly grounded.

For higher abrasion loads, the sister products in HD or XHD construction are available — 355 AS (HD) has a Type 3 wall, and 356 AS (XHD) has a Type 4 wall. For full ATEX conductivity (<10³ Ω), the EC variant 351 EC (MD) is available.

Important context

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 350 AS (MD). In daily use it is referred to as an "antistatic PUR hose" or simply the "AS-MD hose" — it most often stands as the default choice on industrial vacuums and lighter mobile extraction systems.

Technical specifications

Specifications are valid as of 2026-04-15. Fields without a value are not specified in source data.

Material	Polyurethane (PUR), medium-duty
Colour	Transparent
Wall construction	Medium-duty PUR wall with embedded steel spiral
Conveyed media	Gas, dust
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
ATEX marking	II 3D (interior zone 22, exterior zone 22) — antistatic per TRGS 727
Cut to length	Yes — Particulair cuts the hose to your dimensions

Combustible dust

The hose is approved for internal transport of combustible dust in zone 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 350 AS (MD) is supplied in 48 standard sizes from inner Ø 25.1 mm to 500 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.

Dimensions, pressure and vacuum data for AIRDUC® PUR 350 AS (MD)
Inner Ø [mm]	Outer Ø [mm]	Wall thickness [mm]	Working pressure DIN 26057, 10 % elong. [bar]	Working pressure 50 % elong. [bar]	Vacuum DIN 26057 [bar]	Vacuum axially fixed [bar]	Bend radius [mm]	Max. length [m]	Weight [kg/m]	Roll [m]	Article no.
25.1	32.1	0.7	2.445	5.45	0.755	1	23	25	0.2	10	35000251002
30	37	0.7	2.055	4.57	0.63	1	26	25	0.24	10	35000301002
32	39	0.7	1.93	4.29	0.59	1	27	25	0.25	10	35000321002
38	45	0.7	1.635	3.64	0.495	1	31	25	0.29	10, 15	35000381002
40	47	0.7	1.555	3.46	0.47	1	32	30	0.3	10, 15	35000401002
45	52	0.7	1.39	3.08	0.42	1	35	30	0.34	10	35000451002
48	55	0.7	—	—	—	—	—	30	0.36	—	35000481002
50.5	57.5	0.7	1.25	2.78	0.38	1	38	30	0.38	5, 10, 15	35000501002
55	62	0.7	1.14	2.53	0.345	0.99	41	30	0.41	10	35000551002
60	67	0.7	1.05	2.33	0.315	0.83	44	30	0.45	10, 15	35000601002
61	68	0.7	0.97	2.15	0.29	0.71	45	30	0.45	—	35000611002
64.5	71.5	0.7	0.97	2.15	0.29	0.71	47	30	0.48	10	35000651002
70	78	0.7	0.9	2	0.185	0.83	50	30	0.51	10	35000701002
75	83	0.7	0.84	1.87	0.175	0.72	53	30	0.55	10, 15	35000751002
80	88	0.7	0.79	1.75	0.16	0.64	56	30	0.58	5, 10, 15	35000801002
83	91	0.7	0.705	1.56	0.145	0.51	60	15	0.61	—	35000831002
90	98	0.7	0.705	1.56	0.145	0.51	62	30	0.65	10	35000901002
101.5	109.5	0.7	0.635	1.41	0.135	0.66	68	25	0.85	5, 10, 15	35001001002
110	118	0.7	0.575	1.28	0.125	0.55	74	25	0.93	10	35001101002
115	123	0.7	0.55	1.22	0.12	0.5	77	25	0.97	10	35001151002
120	128	0.7	0.53	1.17	0.115	0.46	80	25	1	5, 10, 15	35001201002
126.5	134.5	0.7	0.51	1.13	0.11	0.42	83	25	1.05	5, 10, 15	35001251002
130	138	0.7	0.49	1.08	0.105	0.39	86	25	1.09	10	35001301002
140	148	0.7	0.455	1.01	0.095	0.33	92	25	1.17	5, 10	35001401002
151.5	159.5	0.7	0.425	0.94	0.075	0.36	98	20	1.28	5, 10, 15	35001501002
160	168	0.7	0.4	0.88	0.07	0.31	104	20	1.35	5, 10, 15	35001601002
163	171	0.7	0.375	0.83	0.065	0.28	106	15	1.41	—	35001631002
165	173	0.7	0.375	0.83	0.065	0.28	107	20	1.4	—	35001651002
170	178	0.7	0.375	0.83	0.065	0.28	108	20	1.45	10	35001701002
175	183	0.7	0.365	0.81	0.065	0.26	113	20	1.49	—	35001751002
180	188	0.7	0.355	0.78	0.06	0.24	116	20	1.53	10	35001801002
202.3	210.3	0.7	0.32	0.71	0.055	0.19	128	15	1.7	5, 10, 15	35002001002
204	212	0.7	0.285	0.63	0.065	0.28	138	15	1.75	—	35002041002
225	233	0.7	0.285	0.63	0.05	0.15	143	15	1.9	10	35002251002
250	258	0.7	0.255	0.57	0.045	0.12	158	15	2.11	5, 10	35002501002
254	262	0.7	0.25	0.56	0.045	0.11	160	15	2.14	10	35002541002
275	283	0.7	0.23	0.51	0.04	0.09	173	15	2.32	—	35002751002
280	288	0.7	0.23	0.51	0.04	0.09	176	15	2.36	10	35002801002
300	308	0.7	0.215	0.47	0.035	0.08	188	10	2.52	10	35003001002
305	313	0.7	0.21	0.46	0.035	0.07	191	10	2.57	—	35003051002
315	323	0.7	0.205	0.45	0.035	0.07	197	10	2.65	10	35003151002
325	333	0.7	0.185	0.4	0.03	0.05	210	10	2.74	—	35003251002
350	358	0.7	0.185	0.4	0.03	0.05	218	10	2.94	10	35003501002
356	366	0.7	0.18	0.4	0.03	0.06	222	10	3	—	35003561002
400	408	0.7	0.16	0.35	0.03	0.05	248	10	3.81	5, 10	35004001002
406	414	0.7	—	—	—	—	—	10	3.86	—	35004061002
450	458	0.7	0.14	0.32	0.025	0.04	281	10	4.28	—	35004501002
500	508	0.7	—	—	—	—	313	10	4.75	—	35005001002

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.

Datasheet (Particulair) Complete Particulair-branded datasheet with technical specifications, dimensions and contact information. PDF ATEX and TRGS test report Complete test report for electrical conduction and compliance with ATEX 2014/34/EU and TRGS 727. PDF REACH declaration Manufacturer's declaration of compliance with REACH (EC 1907/2006). PDF · 2026 RoHS declaration Manufacturer's declaration of compliance with the RoHS directive (2011/65/EU). PDF · 2025 ISO 9001 certificate Quality management certificate for the production facility. PDF Installation guidelines General guidelines for correct installation, mounting and use of industrial hoses. PDF · 2025

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.

Article

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.

Read the article

Article

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.

Read the article

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 350 AS (MD) is used:

In the wood-processing industry, 350 AS (MD) is a default choice — the hose is specifically approved to the German wood-trade industry rules (German Wood Trade Association), and so it covers sawdust, planing dust and shavings in central extraction systems at sawmills, joineries and furniture production.

In the plastics and chemical industries, it is used for pneumatic conveying of granulates and powders between silos, dryers and injection-moulding machines. The lightly flexible MD wall makes it easy to route, and the antistatic property is critical where dust can develop electrostatic sparks in transit.

In agriculture, animal-feed and grain industries, it sits on seed and grain pneumatics, and in waste, municipal and ventilation engineering, it features on industrial vacuums, mobile extraction systems and hot-air dryers. The broad ATEX coverage (Zone 0/1/2 gas, Zone 20/21/22 dust) means it can technically be moved between applications without requalification.

Custom lengths and assemblies

AIRDUC® PUR 350 AS (MD) 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.

See our custom hose assemblies

Related hoses

Hoses often considered alongside this one. Suggestions are based on the same category and similar properties.

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.

AIRDUC® PUR 350 AS (MD)