AIRDUC® PUR 351 FOOD (MD) -- Food-grade polyurethane hose for abrasive media

Why this hose?

When abrasive media are conveyed in the food and pharmaceutical industries, two challenges meet at once. The hose has to withstand mechanical wear from granulates, powders and solid particles. At the same time, it must meet formal requirements for food contact and remain cleanable without releasing unintended substances into the process. AIRDUC® PUR 351 FOOD (MD) addresses both in a single construction.

The hose is made of food-grade polyurethane, certified by an independent laboratory for the complete hose in accordance with EU Directive 10/2011, EC 1935/2004 and EU 2015/174. It complies with FDA 21 CFR 177.2600 and the German Food and Feed Code (LFGB), and is manufactured following good manufacturing practice (GMP) per EC 2023/2006. This means the hose can be used in direct contact with dry, acidic, aqueous, alcoholic and dairy-based foodstuffs.

"MD" stands for medium duty. It is the practical middle option: tight enough to handle abrasive media such as granulates, powders and dried products in industrial volumes, while remaining flexible and easy to handle. For more extreme wear loads, the hose is also available as heavy duty (HD) and extra heavy duty (XHD) variants.

Important context

The food-grade approval applies to the complete hose. It is not only the inner PUR liner that has been tested and approved, but the hose as a finished product. This matters because some hoses on the market are certified at component level only (the liner) but not as a complete hose. The independent laboratory test of the complete hose is a stronger guarantee.

Where it is used

Technical specifications

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

Material	Polyurethane (PUR), food-grade
Colour	Transparent
Wall construction	Medium duty (MD), spiral-reinforced food-grade polyurethane
Wall thickness	1 mm (consistent across all dimensions)
Spiral material	Spring steel wire, embedded in the PUR wall
Conveying media	Gas, dust, liquid, solids (granulates, particles)
Temperature range	-40 °C to +90 °C
Short-term peak	+125 °C (suitable for CIP cleaning at typical temperatures)
Food contact	EU 1935/2004 and EU 10/2011 (categories A, B, C, D2 and E), FDA 21 CFR 177.2600, LFGB. The complete hose is tested by an independent laboratory per EU 2015/174.
Manufacturing practice	Good manufacturing practice (GMP) per EC 2023/2006
Flame retardancy	UL94-HB (self-extinguishing after horizontal ignition)
Cut to length	Yes
Manufacturer SKU (model group)	3510000

Dimensions and ordering

AIRDUC® PUR 351 FOOD (MD) is available in 54 standard sizes from inner Ø 19 mm to 500 mm. Each size has its own article number from 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 351 FOOD (MD)
Inner Ø [mm]	Outer Ø [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.
19	26	2.715	5.85	0.68	1	20	20	0.19	—	35100190000
25.1	32.1	2.715	5.85	0.68	1	23	25	0.24	10	35100250000
30	38	2.29	4.92	0.47	1	27	25	0.28	10	35100300000
32	40	2.155	4.63	0.44	1	28	25	0.29	10	35100320000
35	43	1.975	4.25	0.405	1	30	25	0.32	10	35100350000
38	46	1.83	3.93	0.37	1	32	25	0.34	10	35100380000
40	48	1.74	3.74	0.355	1	33	30	0.36	10, 15, 20	35100400000
45	53	1.555	3.33	0.315	1	36	30	0.4	10	35100450000
50.5	58.5	1.405	3.01	0.285	1	39	30	0.44	10, 15, 20	35100500000
55	63	1.28	2.74	0.255	0.98	42	30	0.48	10	35100550000
60	68	1.175	2.52	0.235	0.82	45	30	0.52	10, 15, 20	35100600000
64.5	72.5	1.09	2.33	0.22	0.7	48	30	0.56	10	35100650000
70	79	1.01	2.17	0.15	0.84	52	30	0.6	10, 15	35100700000
75	84	0.945	2.03	0.14	0.73	55	30	0.64	10	35100750000
80	89	0.89	1.9	0.13	0.64	58	30	0.68	10, 15	35100800000
90	99	0.79	1.69	0.115	0.51	64	30	0.76	10	35100900000
101.5	110.5	0.715	1.53	0.11	0.66	70	25	0.99	10, 15, 20	35101000000
102	111	0.715	1.53	0.11	0.66	70	25	0.99	—	35101020000
105	114	0.65	1.39	0.1	0.54	73	25	1.02	—	35101050000
110	119	0.65	1.39	0.1	0.54	76	25	1.07	10	35101100000
115	124	0.62	1.33	0.095	0.5	79	25	1.11	10	35101150000
120	129	0.595	1.28	0.09	0.45	82	25	1.16	10	35101200000
126.5	135.5	0.575	1.23	0.09	0.42	85	25	1.23	10, 15	35101250000
130	139	0.55	1.18	0.085	0.39	88	25	1.25	10	35101300000
133	142	0.51	1.1	0.08	0.33	90	25	1.28	—	35101330000
140	149	0.51	1.1	0.08	0.33	94	25	1.35	10	35101400000
151.5	160.5	0.48	1.02	0.065	0.36	100	20	1.61	5, 10, 15	35101500000
152	161	0.48	1.02	0.065	0.36	100	20	1.61	—	35101520000
155	164	0.45	0.96	0.065	0.32	103	20	1.64	—	35101550000
160	169	0.45	0.96	0.065	0.32	106	20	1.69	10	35101600000
165	174	0.425	0.9	0.06	0.28	108	15	1.75	—	35101650000
170	179	0.425	0.9	0.06	0.28	110	20	1.8	10	35101700000
175	184	0.41	0.88	0.06	0.26	115	20	1.85	—	35101750000
180	189	0.4	0.85	0.055	0.24	118	20	1.9	10	35101800000
202.3	211.3	0.36	0.77	0.05	0.19	130	15	2.13	5, 10, 15	35102000000
202.3	212	0.36	0.77	0.05	0.19	130	15	2.13	—	35102030000
205	214	0.32	0.68	0.04	0.14	133	15	2.01	—	35102050000
220	229	0.32	0.68	0.04	0.14	143	15	2.15	—	35102200000
225	234	0.32	0.68	0.04	0.14	145	15	2.2	10	35102250000
250	259	0.29	0.62	0.035	0.11	160	15	2.44	5, 10	35102500000
254	263	0.28	0.6	0.035	0.1	162	15	2.48	—	35102540000
275	284	0.26	0.56	0.035	0.09	175	15	2.68	—	35102750000
280	289	0.26	0.55	0.03	0.08	178	15	2.73	—	35102800000
300	309	0.24	0.51	0.03	0.07	190	10	2.92	10	35103000000
305	314	0.23	0.49	0.03	0.06	195	10	2.97	—	35103050000
315	324	0.23	0.49	0.03	0.06	199	10	3.06	—	35103150000
320	329	0.22	0.47	0.03	0.06	203	10	3.11	—	35103200000
325	334	0.22	0.47	0.03	0.06	205	10	3.16	10	35103250000
350	359	0.205	0.44	0.025	0.05	—	10	3.4	10	35103500000
375	384	0.195	0.41	0.025	0.05	237	10	4.08	—	35103750000
380	389	0.18	0.39	0.025	0.04	240	10	4.14	—	35103800000
400	409	0.18	0.39	0.025	0.04	265	10	4.35	10	35104000000
450	459	0.16	0.34	0.02	0.03	283	10	4.89	—	35104500000
500	509	0.145	0.31	0.02	0.03	315	10	5.43	—	35105000000

Note: Fields without a value (—) are not specified in the manufacturer's factsheet. 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 tested and documented in compliance with the following European and international standards.

EU 1935/2004. European framework regulation for materials in contact with food. The hose is approved as a complete product, not only at component level.
EU 10/2011 (categories A, B, C, D2 and E). Detailed requirements for plastic materials in food contact. The hose is tested and approved for aqueous, acidic, alcoholic, dairy-based and dry foodstuffs.
FDA 21 CFR 177.2600. The US Food and Drug Administration approval for rubber elastomers in repeated food contact. The food-grade polyurethane meets the requirements.
LFGB. The German Lebensmittel-, Bedarfsgegenstände- und Futtermittelgesetzbuch (Food, Commodities and Feed Code), the national German implementation of common European food-contact rules.
GMP EC 2023/2006. Good Manufacturing Practice for materials and articles intended to come into contact with food. Ensures traceability and documented quality control in the manufacturing process.
DIN 26057. German industrial standard for hoses for pneumatic conveyance, defining test methods for working pressure and vacuum.
UL94-HB. US standard for flame retardancy. The hose self-extinguishes after horizontal ignition.
REACH. EU Regulation 1907/2006 on the registration, evaluation and authorisation of chemicals.
RoHS. EU Directive 2011/65/EU on the restriction of hazardous substances in electrical and electronic equipment.

The hose is not ATEX-approved and not electrically conductive. For processes that require both food contact and explosion protection, special variants are available, and we are happy to advise on the right choice.

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 specification, dimensions and contact information. 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

Industries that use it

The hose is used across many different industrial contexts. Common to them is the combination of abrasive media and requirements for food or pharmaceutical contact.

In the food industry it is a core application, used for conveying dry and wet food ingredients between processing stages. In the pharmaceutical industry it is used for powder management in mixing processes, for filling tablet presses, and for batch transfers where traceability is critical. In the agricultural industry it forms part of grain, seed and feed transfer.

In conveying and bulk industry it is used for pneumatic conveyance between silos and production lines. In the plastics industry it is used for granulate conveyance to food-contact packaging, and in mechanical engineering it forms part of central process systems in food production.

It is also used in cleaning machine industry for industrial vacuum cleaners and cleaning machines in food facilities, and in environmental and cleaning technology for waste and recycling in the food industry.

Custom lengths and assemblies

AIRDUC® PUR 351 FOOD (MD) can be cut to length and assembled with food-grade couplings, cuffs and threaded fittings to fit your installation precisely. We make complete hose assemblies with crimped ferrules, clamping collars or threaded connections, depending on what the process requires.

For food and pharmaceutical installations, it is especially important that couplings and fittings are also food-grade and can be cleaned to the same level as the hose. The point is that the entire system meets the food-contact requirements, not only 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

Is AIRDUC® PUR 351 FOOD (MD) food-grade?

Yes. The hose is approved to EU 1935/2004 and EU 10/2011 (categories A, B, C, D2 and E) and complies with FDA 21 CFR 177.2600. The food-grade polyurethane is tested by an independent laboratory for the complete hose. The hose also complies with the German Food and Feed Code (LFGB) and is manufactured following good manufacturing practice (GMP) per EC 2023/2006.

Which food categories does the approval cover?

EU 10/2011 classifies foodstuffs into categories based on fat content, acidity and solubility. AIRDUC® PUR 351 FOOD (MD) is tested and approved for category A (aqueous foodstuffs), B (acidic foodstuffs pH<4.5), C (alcoholic beverages <20 %), D2 (dairy products) and E (dry foodstuffs such as grains and powders). This covers the great majority of industrial food streams.

What is the difference between the FOOD variant and the EC variant of AIRDUC® PUR 351?

The FOOD variant is food-grade per EU 1935/2004 and FDA but is not conductive. The EC variant is electrically conductive and ATEX-approved but is not food-grade. The construction and dimensions are otherwise identical. The choice depends on whether the process requires food contact or explosion protection. For processes requiring both, other variants are available, and we are happy to advise on the right choice.

What temperature range does the hose tolerate?

The normal operating range is -40 °C to +90 °C. Short-term peaks up to +125 °C are permitted, which makes the hose suitable for CIP (Cleaning in Place) at typical temperatures. For warmer food processes such as steam cleaning, other hose types in the FlexCore range are available, typically silicone- or PTFE-based constructions.

Can AIRDUC® PUR 351 FOOD (MD) be supplied in custom lengths?

Yes. The hose can be cut to length and assembled with food-grade couplings, cuffs and threaded fittings through Particulair's custom hose assemblies. Maximum production length varies from 10 to 30 m depending on diameter (see the dimension table).

Is the hose ATEX-approved?

No. AIRDUC® PUR 351 FOOD (MD) is neither conductive nor ATEX-approved. For food processes that are also located in ATEX zones, special variants combining food-grade approval with a conductive wall are available. Contact us for advice and assessment of the specific requirement.

Is the hose flame-retardant?

Yes. The hose is flame-retardant per UL94-HB, meaning it self-extinguishes after horizontal ignition in a standardised test setup. Note that flame-retardancy per UL94-HB is not equivalent to ATEX compliance. The hose must not be used in ATEX-classified zones based on the flame-retardancy alone.

AIRDUC® PUR 351 FOOD (MD)