ATEX/ESD · Antistatic

PROTAPE® PUR 333 AS (MD)

Hard-wearing antistatic polyurethane hose in medium-duty construction with increased pressure and vacuum resistance. Wall thickness 0.9 mm and a plastic-coated spring steel spiral integrated in the wall — a construction targeted at processes where the hose must both handle abrasive media and sustain high vacuum loads. Well suited for municipal vehicles, suction processes, mortar conveying and vacuum pumps.

Download datasheet (PDF)

Antistatic wall ~10⁹ Ω Abrasion-resistant MD construction Plastic-coated spiral REACH/RoHS

Static dissipation ~10⁹ Ω
Abrasion-resistant PUR wall 0.9 mm
Increased pressure and vacuum resistance
Gas, dust
Plastic-coated spiral
Cut to length

Why this hose?

PROTAPE® PUR 333 AS (MD) differs from the rest of the PROTAPE family in two construction details: a thicker 0.9 mm wall and a plastic-coated spring steel spiral instead of bare wire. That gives higher mechanical wear resistance and better vacuum tolerance, and it protects the spiral from corrosion in humid environments.

The hose is antistatic with surface resistance approximately 10⁹ Ω. That matches the NFPA 652 thresholds for antistatic components, but the factsheet does not list a formal ATEX marking. The hose is therefore primarily targeted at processes where an antistatic wall is good practice rather than a formal safety requirement — municipal vehicles, suction trucks, sweepers and vacuum pumps.

The application range is broad: high vacuum loads in vacuum pumps and suction processes, abrasive media such as mortar and powder, and compressors and municipal vehicles where the hose often operates under shifting loads. The ATEX-approved sister construction 350 AS (MD) is the choice when formal ATEX marking is a requirement.

Important context

Not ATEX-marked in the factsheet. The hose is antistatic and can be good practice in environments with static-electricity risk, but if your application requires documented ATEX 2014/34/EU + TRGS 727 approval, choose a formally ATEX-marked variant such as AIRDUC® PUR 350 AS (MD) or AIRDUC® PUR 351 EC (MD).

Where it is used

PROTAPE® PUR 333 AS (MD) is a workhorse on municipal vehicles, suction trucks and sweepers. The 0.9 mm thick wall handles the combination of mechanical wear and varying vacuum load that this kind of vehicle entails.

In practice we see it used on vacuum pumps and compressors as a connection hose, for oil mist extraction on industrial machines, and for mortar conveying in construction and maintenance jobs.

It is also used for asbestos sanitation where an antistatic wall is required, for powder application in offset printing machines, and for rock drill handling where particle loading is high.

The formal product name is PROTAPE® PUR 333 AS (MD). In daily use, many simply call it "333 AS" or "the heavy-duty AS" — the preferred hose on municipal vehicles where vacuum tolerance is central.

Technical specifications

Specifications are current as of 15 April 2026 and refer to 20 °C unless otherwise stated.

Material	Polyurethane (PUR), permanently antistatic
Colour	Transparent
Wall construction	Medium duty (MD), 0.9 mm wall thickness, plastic-coated spring steel spiral
Conveying media	Gas, dust
Temperature range	−40 °C to +90 °C
Short-term peak	+125 °C
Electrical resistance	Antistatic wall, surface resistance approximately 10⁹ Ω (NFPA 652 threshold: 10⁸–10⁹ Ω)
ATEX marking	Not formally ATEX-marked; the hose is antistatic and can serve as an ESD component in a grounded system
Cut to length	Yes
Manufacturer SKU (model group)	3330007

Vacuum tolerance

333 AS (MD) is built for high vacuum loads. In the smaller diameters it withstands DIN vacuum up to 0.5 bar and axially-fixed vacuum up to 1 bar — markedly higher than standard 330 constructions.

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.

Dimensions, pressure and vacuum data for PROTAPE® PUR 333 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.
40	49	0.9	1.02	2.64	0.505	1	38	30	0.46	10	33300400007
50.5	59.5	0.9	0.815	2.187	0.41	0.95	48	30	0.6	10	33300500007
60	69	0.9	0.685	1.77	0.35	0.9	58	30	0.7	10	33300600007
64.5	73.5	0.9	0.635	1.635	0.32	0.775	63	30	0.75	10	33300650007
70	79	0.9	0.59	1.52	0.3	0.67	68	30	0.81	10	33300700007
75.6	84.6	0.9	0.55	1.42	0.28	0.59	73	30	0.87	10	33300750007
80	89	0.9	0.515	1.33	0.26	0.52	78	30	0.92	10	33300800007
101.5	113.5	0.9	0.415	1.07	0.11	0.485	98	30	0.99	10	33301000007
120	132	0.9	—	—	—	—	—	30	1.16	—	33301200007
126.5	138.5	0.9	0.335	0.855	0.09	0.315	123	30	1.22	10	33301250007
140	152	0.9	0.295	0.765	0.08	0.25	138	30	1.35	10	33301400007
151.5	163.5	0.9	0.275	0.715	0.075	0.22	148	25	1.45	10	33301500007
160	172	0.9	0.26	0.67	0.07	0.195	158	25	1.53	10	33301600007
180	192	0.9	0.23	0.595	0.06	0.15	178	25	1.71	10	33301800007
202.3	214.3	0.9	0.21	0.535	0.055	0.125	198	20	1.92	10	33302000007
250	263	0.9	0.165	0.43	0.045	0.095	248	15	2.52	10	33302500007
254	267	0.9	—	—	—	—	—	10	2.55	—	33302540007
300	313	0.9	—	—	—	—	298	10	3	—	33303000007

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 documented to the following standards:

ISO 8031. Measurement of electrical resistance in rubber and plastics hoses; the method used to verify antistatic thresholds.
NFPA 652. US standard on the fundamentals of combustible dust. Antistatic components have resistance in the 10⁸–10⁹ Ω range.
REACH (EC 1907/2006) and RoHS 2011/65/EU. The manufacturer holds declarations of compliance.
Note: The hose is not formally ATEX-marked. For processes requiring documented ATEX 2014/34/EU + TRGS 727 approval, choose a formally ATEX-marked variant.

Documentation and downloads

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

Datasheet (Particulair) Particulair-branded 4-page factsheet with all technical specifications, dimensions and standards. 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 Manufacturer's quality management certificate to ISO 9001. PDF Installation guide Guidance on correct installation, grounding and maintenance. PDF · 2025

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:

ESD

The invisible weakest link

Why a conductive or antistatic hose is not enough on its own — and what grounding means for the finished system.

Read the article

Resistance

Know your ohm

The difference between antistatic and conductive — and which level is required in which zone.

Read the article

Industries that use it

The hose is used across industries where an antistatic wall and high vacuum tolerance are combined needs:

Municipal services and vehicle industry have the hose as a standard choice on suction trucks, sweepers and cleaning machines — where antistatic wall and abrasion resistance are a combined priority.

Cleaning industry uses it for cleaning machines and industrial vacuum cleaners with high vacuum requirements.

Pump and compressor industry as well as extraction/filtration technology use the hose as a connection and extraction hose where mechanical and pneumatic loads alternate.

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.

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

Is PROTAPE® PUR 333 AS (MD) ATEX-approved?

No, not formally. The hose is antistatic with surface resistance approximately 10⁹ Ω, but the factsheet does not list a formal ATEX 2014/34/EU + TRGS 727 marking. It functions as an antistatic ESD component in a grounded system, but if your application requires explicit ATEX marking, choose for example PROTAPE® PUR 330 AS (LD) or AIRDUC® PUR 351 EC (MD).

What is the difference between 333 AS and 330 AS?

Both are antistatic PUR hoses, but 333 AS (MD) has a thicker wall (0.9 mm vs. 0.6 mm) and higher pressure and vacuum tolerance. 333 also has a plastic-coated spiral instead of bare spring steel — providing better corrosion protection in humid environments. 333 is built for municipal vehicles and vacuum pumps; 330 is built for lighter extraction systems.

What vacuum does the hose tolerate?

Vacuum tolerance varies with diameter. In the smaller diameters, DIN vacuum reaches 0.5 bar and axially-fixed vacuum reaches 1 bar. Vacuum tolerance falls in larger diameters. Specific values are in the dimensions table.

What temperature range does the hose tolerate?

The normal operating range is −40 °C to +90 °C, and short-term peaks up to +125 °C are permitted.

Can the hose be supplied in custom lengths?

Yes. The hose can be cut to length and assembled with couplings through Particulair's custom hose assemblies. Production lengths are typically 30 m, supplied in 10 m rolls.

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.