High-temperature · up to +125 °C
AIRDUC® PUR 356 HT (XHD)
The heavy-duty variant of the AIRDUC® HT family. XHD construction (extra heavy duty) classified per DIN 26057 Type 4. Designed for high throughput of hot abrasive media — dryers, vacuum pumps, silo trucks, grain pneumatics at higher temperatures. Tolerates +125 °C continuous and +150 °C peak. The increased wall thickness means the hose survives the most demanding industrial applications where an MD variant would wear too quickly.
- +125 °C / +150 °C peak
- XHD extreme wear resistance
- Type 4 pressure rating
- Gas, dust, liquid, solid
- Industrial scale
- Cut to length
Why this hose?
AIRDUC® PUR 356 HT (XHD) is the heaviest in the HT family. XHD construction and DIN 26057 Type 4 pressure rating mean the hose handles both high temperatures (+125 °C continuous, +150 °C peak) and the mechanical loads from heavy industrial applications.
The practical example: pneumatics on a granulate dryer where air and granulate are both above +100 °C, and flow volume is high. A standard MD hose would wear too quickly; the XHD construction is built to last.
Where it is used
In practice 356 HT (XHD) is seen on industrial dryers, vacuum pumps and silo trucks where hot abrasive media run at high throughput.
The formal product name is AIRDUC® PUR 356 HT (XHD). In daily use: "heavy HT" or "356 HT XHD".
Technical specifications
Specifications are current as of 15 April 2026 and refer to 20 °C.
| Material | Polyurethane (PUR), HT formulation |
|---|---|
| Colour | Black |
| Wall construction | Extra heavy duty (XHD), heavily reinforced HT PUR |
| Standard | DIN 26057 Type 4 |
| Temperature range | −40 °C to +125 °C (continuous) |
| Short-term peak | +150 °C |
| Cut to length | Yes |
| Manufacturer SKU (model group) | 3561015 |
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.
| Inner Ø |
Outer Ø |
Wall thickness |
Working pressure |
Vacuum |
Bend radius |
Max. length |
Weight |
Roll |
Article no. |
|---|---|---|---|---|---|---|---|---|---|
| 32 | 43 | 2 | — | 1 | 100 | 25 | 0.62 | — | 35600321015 |
| 38 | 49 | 1.8 | 4.475 | 1 | 104 | 15 | 0.72 | — | 35600381015 |
| 42 | 53 | 1.8 | 4.27 | 1 | 120 | 15 | 0.79 | — | 35600421015 |
| 50.5 | 61.5 | 1.8 | 3.615 | 1 | 134 | 15 | 0.93 | 10 | 35600501015 |
| 51 | 62 | 1.8 | 3.505 | 1 | 134 | 15.25 | 0.94 | — | 35600511015 |
| 60 | 71 | 1.8 | 3.045 | 1 | 156 | 15 | 1.09 | — | 35600601015 |
| 63 | 74 | 1.8 | 2.725 | 1 | 163 | 15 | 1.14 | 10 | 35600631015 |
| 70 | 82 | 1.8 | 2.63 | 1 | 186 | 15 | 1.26 | — | 35600701015 |
| 76 | 88 | 1.8 | 2.455 | 1 | 195 | 15 | 1.36 | — | 35600761015 |
| 80 | 92 | 1.8 | 2.315 | 1 | 205 | 15 | 1.43 | 10 | 35600801015 |
| 102 | 115 | 2 | 1.995 | 1 | 272 | 15 | 2.3 | — | 35601021015 |
| 120 | 133 | 2 | 1.73 | 0.965 | 330 | 15 | 2.68 | — | 35601201015 |
| 127 | 140 | 2 | 1.705 | 0.935 | 336 | 15 | 2.83 | — | 35601271015 |
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 certified to the following standards:
- DIN 26057 Type 4. Highest pressure rating class for spiral-reinforced hoses.
- REACH and RoHS. The manufacturer holds declarations of compliance.
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
Even though this hose is not ATEX-relevant, these two articles provide useful background on electrical resistance and industrial safety — important if you later combine the hose with electrical equipment or work in mixed environments:
Industries that use it
The hose is used in industrial-scale production at high temperatures:
Plastics, pump and silo industries use the hose for the heaviest hot-pneumatic applications.
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.
Frequently asked questions
What is the difference between 351 HT (MD) and 356 HT (XHD)?
Both are HT variants with the same temperature tolerance (+125 °C continuous, +150 °C peak). 356 (XHD) has markedly thicker wall and higher DIN 26057 Type 4 pressure rating. Choose 351 (MD) for standard hot-medium pneumatics; choose 356 (XHD) for the most demanding industrial applications.
Is the hose ATEX-approved?
No. Neither antistatic nor ATEX-marked. For high-temperature applications in classified zones, a metal hose (e.g. METAL HOSE 375 HT) with antistatic documentation is typically combined.
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.
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.
What is the difference between "continuous operation" and "short-term peak"?
Continuous operation is the temperature the hose can operate at uninterrupted over long periods without material degradation. Short-term peak is the highest temperature the hose can be exposed to briefly (typically minutes, not hours) without permanent damage. Running continuously at peak temperature significantly reduces service life and can lead to sudden failure. Stay within the continuous limit in normal operation.
Which alternatives are available for even higher temperatures?
For continuous operation above the hose's limit, specialty hoses are available in the FlexCore range: silicone-based hoses such as CALORFORM (up to +110 °C), aramid- and silicone-based CP hoses (up to +280-300 °C), and metal-based hoses such as METAL HOSE 375 HT (up to +400 °C). The choice depends on temperature, mechanical loading and medium type. We are happy to advise on the right match.
What is the difference between working pressure and burst pressure?
Working pressure is the pressure the hose is designed to operate at continuously and safely. Burst pressure is where the hose mechanically fails. The safety factor is typically 3:1 (burst is 3× working pressure), but varies by construction. Running the hose close to burst pressure is never safe in practice — there must always be margin for sudden pressure spikes, temperature changes and material ageing. Stay below working pressure in normal operation.
What is the difference between PUR (polyurethane) and PVC (polyvinyl chloride)?
PUR has better wear resistance (typically 3-5× higher abrasion resistance than PVC), broader temperature range (−40 to +90 °C vs. PVC's −20 to +70 °C), and is more flexible at cold temperatures. PVC, on the other hand, is more economical and sufficient for many standard applications. Choose PUR for abrasive media and demanding temperatures; choose PVC for standard extraction and low-load pneumatics.