ATEX/ESD · Conductive
CARBOFLEX®/U.L./OHM
Highly flexible oil and petrol suction and pressure hose, conductive on both core and outer cover. The inner tube in NBR (nitrile rubber) is oil- and petrol-resistant; the outer cover in CR (chloroprene) is abrasion- and ozone-resistant. With textile plies and a steel spiral, and a working pressure of 5 bar against 15 bar burst pressure. Designed for tank trucks, fuel supply and industrial cleaning machines — wherever flammable liquids need to be conveyed with full conductive dissipation.
- Fully conductive <10⁶ Ω
- Oil- and petrol-resistant
- Suction/pressure on liquids
- Highly flexible NBR/CR
- 5 bar working pressure
- Cut to length
Why this hose?
CARBOFLEX®/U.L./OHM solves a specific problem: conveying flammable liquids where a static-electricity spark could ignite the vapours that always accompany such media. Conductive components on both the core and the outer cover dissipate the static electricity to ground, which of course requires the hose to be properly grounded at both ends.
The construction is the classic rubber hose with textile plies and a steel spiral: nitrile rubber (NBR) on the inside for oil and petrol resistance, chloroprene (CR) on the outside for abrasion and ozone resistance. That gives a hose that tolerates the aggressive media inside and the punishing life on a tank truck or industrial loading bay outside.
The hose is built for 5 bar working pressure and 15 bar burst, sufficient for standard tank unloading and fuel supply. For higher pump pressures, the sister product CARBOFLEX®/OHM/10 offers 10 bar working pressure and 30 bar burst. Both hoses have the same conductive classification, so the choice mainly depends on pressure loading.
Proper grounding is not optional. The conductive wall dissipates static electricity to ground, but only if the hose is connected to ground at both ends. Without grounding, a spark between hose and tank is still possible — and that can ignite the vapours that come with flammable liquids. We always recommend measuring loop resistance after installation.
Where it is used
CARBOFLEX®/U.L./OHM is used wherever flammable liquids move from one tank to another — from tank trucks to underground tanks, from fuel depots to mobile generators, and from industrial heating plants to local tanks.
In practice we see it used for tank truck loading and unloading of petrol, diesel and heating oil, for fuel supply to trucks and marine vessels, and for industrial cleaning where oil or heating oil must be handled with conductive dissipation.
It is also used for oil recycling in waste and recycling industries, for hydraulic oil transport in specialised tasks, and for screening machines and separation in environmental technology.
The formal product name is CARBOFLEX®/U.L./OHM. In daily use, many simply call it "the conductive oil hose" or "CARBOFLEX UL" — the classic rubber hose for tank unloading.
Technical specifications
Specifications are current as of 13 April 2026 and refer to 20 °C unless otherwise stated.
| Inner tube | NBR (nitrile rubber), oil- and petrol-resistant |
|---|---|
| Outer cover | CR (chloroprene), abrasion- and ozone-resistant |
| Colour | Black (both core and outer cover) |
| Wall construction | Smooth interior, shallow corrugated outer cover, textile plies + steel spiral |
| Conveying media | Flammable and non-flammable liquids |
| Temperature range | −40 °C to +90 °C (oil up to +100 °C) |
| Working pressure | 5 bar |
| Burst pressure | 15 bar |
| Vacuum | 0.9 bar |
| Maximum aromatic content | 50 % |
| Electrical resistance | Conductive on core and outer cover (<10⁶ Ω); contact resistance <10⁹ Ω (antistatic) |
| Cut to length | Yes |
| Manufacturer SKU (model group) | 3354 |
CARBOFLEX®/U.L./OHM has fully conductive components (resistance below 10⁶ Ω) on both core and outer cover. That is the highest classification level for ESD dissipation and provides essentially instant static-electricity dissipation to ground — provided correct installation and grounding.
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 |
Burst pressure |
Vacuum |
Bend radius |
Max. length |
Weight |
Roll |
Article no. |
|---|---|---|---|---|---|---|---|---|---|---|
| 51 | 62 | 5.5 | 5 | 15 | 0.9 | 130 | 40 | 1.38 | 40 | 3354050000 |
| 76 | 88 | 6 | 5 | 15 | 0.9 | 190 | 40 | 2.24 | 40 | 3354075000 |
| 102 | 115 | 6.5 | 5 | 15 | 0.9 | 255 | 40 | 3.29 | 40 | 3354100000 |
| 152 | 169 | 8.5 | 5 | 15 | 0.9 | 460 | 20 | 6.34 | 20 | 3354150000 |
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 or documented to the following standards:
- EN ISO 1307:2008. International standard format for rubber and plastics hoses for liquids, including dimensional tolerances and pressure classes.
- TRbF 131, Part 2, § 5.5. German Technical Rules for Flammable Liquids — defines requirements for hoses used in fuel and oil distribution.
- Maximum aromatic content 50 %. The hose's NBR wall is tested for aromatic content up to this threshold.
- ISO 8031. Measurement of electrical resistance in rubber and plastics hoses; method for verifying conductive levels.
- REACH (EC 1907/2006) and RoHS 2011/65/EU. 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
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:
Industries that use it
The hose is used across industries where flammable liquids must be conveyed with conductive dissipation:
Cleaning and environmental technology use the hose in industrial cleaning machines and separation systems where oil or fuel is handled.
Transport and bulk industry has it as a standard choice on tank trucks for both public and industrial fuel supply.
Waste, recycling and marine industries use it for oil recovery, used-oil transport and marine bunkering where safe conductive dissipation is critical.
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 does "U.L./OHM" mean in the name?
"U.L." stands for Underwriters Laboratories — denoting that the hose has conductive components at underwriter level. "OHM" indicates the hose is fully electrically conductive (resistance below 10⁶ Ω on both core and outer cover). The hose is targeted at flammable liquids where a static-electricity spark could ignite vapours.
What is the difference between CARBOFLEX®/U.L./OHM and CARBOFLEX®/OHM/10?
Both are conductive oil and petrol hoses. The difference is the pressure class: U.L./OHM is built for 5 bar working pressure and 15 bar burst, while OHM/10 is built for 10 bar working pressure and 30 bar burst. Choose U.L./OHM for standard tank unloading and fuel supply; choose OHM/10 for high pump pressures and demanding industrial processes.
What is the maximum aromatic content the hose tolerates?
50 % aromatic content. That is still high enough to cover standard petrol and diesel. For chemicals with higher aromatic content (certain industrial solvents), a specific PTFE- or ETFE-based hose should be considered.
What temperature range does the hose tolerate?
The normal operating range is −40 °C to +90 °C. For contact with oil, the maximum tolerable temperature is +100 °C.
How long are the rolls?
Standard roll length is 40 m. Maximum production length is 40 m in most diameters, making it practical for tank truck loading where one long hose without joints is preferred.
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.