AIRDUC® PUR 352 SE (MD) -- Flame-retardant polyurethane hose for ventilation, heating and plumbing in rail vehicles and ships

Why this hose?

AIRDUC® PUR 352 SE (MD) is developed for environments where a spark ignition has to be stopped as quickly as possible. The PUR wall is formulated to be flame-retardant — when the ignition source is removed, the material self-extinguishes and does not support continued combustion. That sets it apart from standard PUR hoses such as AIRDUC® PUR 355 HD, which are mechanically wear-resistant but not self-extinguishing.

The hose combines flame retardance with good flexibility and abrasion resistance. The stainless steel spiral in grade 1.4301 provides form stability under suction and pressure, and the PUR material retains flexibility down to −40 °C. Short-term peaks are tolerated up to +125 °C, although the normal operating range tops out at +90 °C.

It is certified to a number of standards for fire resistance in specific applications: DIN 5510-2 (rail), FMVSS 302 (motor vehicles) and NF P 92-507 M3 (public buildings). These are different test standards with different criteria — choose the one that matches the specific installation, since a single material may well satisfy all three without those being the same requirement being met.

SE is not ATEX

Flame-retardant hoses and ATEX-approved hoses are not the same. SE concerns the material's reaction to open flame. ATEX concerns the electrical dissipation of static electricity in potentially explosive atmospheres. An SE hose without a conductive wall must not be used in ATEX zones -- choose an EC or AS variant that meets TRGS 727.

Where it is used

The hose is used in installations where fire safety is a regulatory or insurance prerequisite -- rail vehicles, ships, tunnel construction and public buildings with stricter fire requirements.

In rail it is used for smoke extraction, ventilation and heating systems where DIN 5510-2 (class SR2, ST2) is required. In shipping for ventilation and cooling on deck and in engine rooms.

In tunnel construction for dust and smoke extraction underground, where an open flame can have serious consequences. The hose is also used in the automotive industry, where FMVSS 302 specifies flame retardance of materials inside vehicles.

The formal product name is AIRDUC® PUR 352 SE (MD). In day-to-day use, most people refer to it as a "flame-retardant PUR hose" or simply an "SE hose", where SE stands for self-extinguishing.

Technical specifications

Specifications are current as of 2026-04-15 and refer to the manufacturer's data sheet.

Material	Polyurethane (PUR), flame-retardant
Colour	Black
Wall construction	Flame-retardant PUR wall with embedded stainless steel spiral (1.4301)
Spiral material	Stainless steel 1.4301
Conveying media	Gas, dust, liquid, granulates
Temperature range	−40 °C to +90 °C
Short-term peak	+125 °C
Smooth interior	Smooth inner surface
Fire class	UL94-V0, DIN 4102-B1, DIN 5510-2 (SR2, ST2), FMVSS 302, NF P 92-507 M3
Cut to length	Yes -- Particulair cuts the hose to your length

SE is not ATEX

Fire safety and explosion protection are two distinct disciplines, and they are easy to confuse. SE concerns the material's reaction to open flame — the flame self-extinguishes once the source is removed. ATEX concerns the dissipation of static electricity, so no spark forms in the first place. 352 SE (MD) is flame-retardant but not electrically conductive. In a zone-classified atmosphere, choose an EC or AS variant that meets TRGS 727 — for instance AIRDUC® PUR 351 EC (MD).

Dimensions and ordering

AIRDUC® PUR 352 SE (MD) is supplied in 18 standard sizes from inner Ø 20 mm to 450 mm. Each size has its own article number at the manufacturer. Standard roll length is typically 20 m, and the hose can be cut to length.

Dimensions, pressure and vacuum data for AIRDUC® PUR 352 SE (MD)
Inner Ø [mm]	Outer Ø [mm]	Wall thickness [mm]	Working pressure DIN 26057, 10 % elong. [bar]	Vacuum axially fixed [bar]	Bend radius [mm]	Max. length [m]	Weight [kg/m]	Article no.
20	27	0.9	—	—	34	20	0.2	35200200000
22	29	0.9	—	—	36	20	0.21	35200220000
38	46	0.9	—	—	52	25	0.34	35200380000
42	50	0.9	—	—	60	20	0.37	35200420000
50	58	0.9	—	0.285	64	30	0.44	35200500000
54	62	0.9	1.175	0.235	68	20	0.47	35200540000
60	68	0.9	—	0.235	75	30	0.52	35200600000
77	86	0.9	0.79	0.115	97	15	0.65	35200770000
90	99	0.9	—	0.115	109	30	0.76	35200900000
100	109	0.9	—	0.11	121	25	0.97	35201000000
102	111	0.9	0.7	0.1	122	10	0.99	35201020000
115	124	0.9	—	0.095	136	25	1.11	35201150000
150	159	0.9	—	0.065	175	20	1.59	35201500000
160	169	0.9	—	0.065	186	20	1.61	35201600000
180	189	0.9	—	0.055	208	20	1.9	35201800000
200	209	0.9	—	0.05	230	15	2.11	35202000000
250	260	0.9	—	0.035	285	15	2.4	35202500000
450	460	0.9	—	0.02	508	10	4.82	35204500000

Note: Fields without a value (—) are not specified in the manufacturer's data sheet. Overpressure and underpressure are recommended operating limits; products can be subjected to higher loads on request. The bend radius is measured along the inside of the hose bend. Contact us for full specifications or special variants.

Standards and compliance

The hose is tested and documented in compliance with the following standards:

UL94-V0. Underwriters Laboratories standard for the flammability of plastics. V0 is the highest class -- the material has to self-extinguish within 10 seconds after the ignition source is removed.
DIN 4102-B1. German standard for the fire behaviour of building materials. B1 = difficult to ignite.
DIN 5510-2 (SR2, ST2). German rail standard for fire and smoke development in rail vehicles. SR2 = smoke density class, ST2 = toxicity class.
FMVSS 302. US Federal Motor Vehicle Safety Standard for the flammability of materials inside motor vehicles.
NF P 92-507 M3. French standard for the flammability of materials in public buildings.
REACH (EC 1907/2006). EU regulation on the registration, evaluation, authorisation and restriction of chemicals. The hose materials comply with REACH; a manufacturer declaration is available for download.
RoHS (Directive 2011/65/EU). Restriction of Hazardous Substances -- restriction on the use of certain hazardous substances in products. The hose components comply with the RoHS limit values.

The hose is not ATEX approved and must not be used in potentially explosive atmospheres. For ATEX applications see the AIRDUC® PUR EC or AS variants.

Documentation and downloads

Additional documents about this hose, its compliance and installation. Click to download as PDF in a new tab.

Data sheet (Particulair) Complete Particulair-branded data sheet with technical specification, dimensions and contact information. PDF ATEX and TRGS test report Full test report for electrical dissipation and compliance with ATEX 2014/34/EU and TRGS 727. In English. PDF REACH declaration Manufacturer declaration of compliance with REACH (EC 1907/2006). In English. PDF · 2026 RoHS declaration Manufacturer declaration of compliance with the RoHS Directive (2011/65/EU). In English. PDF · 2025 ISO 9001 certificate Quality management certificate for the production facility. In English. PDF Installation guidelines General guidelines for correct installation, assembly and use of industrial hoses. In English. PDF · 2025

Industries that use it

The hose is used in industries with stricter fire requirements -- rail, shipping, tunnel construction and buildings with specific test standards.

In the rail and vehicle industry, DIN 5510-2 (classes SR2 for smoke density and ST2 for toxicity) is often required for new train sets and refurbishments — and 352 SE (MD) meets precisely that standard. It is used for ventilation, heating and smoke extraction in passenger cars, locomotives and service vehicles.

In shipping, the hose sits in ventilation and cooling systems on deck and in engine rooms, where fire requirements from classification societies and port authorities are stricter than in shore-based industry. In tunnel construction, it is used for dust extraction and ventilation underground, where an open flame has dramatic consequences in a confined space.

In paper and mechanical engineering, the hose is used for pumps and extraction where flame retardance is specified by the insurer or by internal safety requirements. In the automotive industry, it is used where FMVSS 302 imposes requirements on interior vehicle materials. In the construction industry, for concrete and mortar pumping where hot processes or welding take place near the hose.

Custom lengths and assemblies

AIRDUC® PUR 352 SE (MD) can be cut to length and assembled with cuffs, ferrules and threads to fit your installation precisely. We supply finished hose assemblies with crimped ferrules, clamping cuffs or threaded connections depending on what the process requires.

We advise on which combination of hose and assembly gives the longest service life in the specific application. It can have a real impact on how often the hose needs to be replaced and how stable the system runs over time.

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 does SE mean in the product name?

SE stands for Self-Extinguishing. The hose material is flame-retardant per UL94-V0 and DIN 4102-B1. This means the material does not support combustion once the ignition source is removed.

Is SE the same as ATEX approval?

No. Flame retardance and ATEX are two distinct safety properties. ATEX concerns the electrical dissipation of static electricity to prevent ignition in potentially explosive atmospheres. SE concerns the material's behaviour when exposed to open flame. An SE hose is not automatically ATEX approved.

Where are SE hoses typically used?

Flame-retardant hoses are used where fire safety is critical: rail vehicles, ships, tunnel construction, ventilation systems in public buildings. Standards such as DIN 5510-2 (rail), FMVSS 302 (vehicles) and NF P 92-507 M3 (public buildings) specify the requirements.

Can I have the hose cut to length?

Yes. AIRDUC® PUR 352 SE (MD) is cut to your length and we fit couplings and assemblies that match the specific installation.

What is the lead time?

Standard variants are typically in stock with a few days' lead time. Special variants depend on the manufacturer's production -- we give you a precise date when you contact us.

AIRDUC® PUR 352 SE (MD)