When selecting tubing for an SCR system, the hose must handle DEF / AdBlue / urea fluid, temperature changes, pressure, vibration and continuous routing inside the vehicle or equipment. LANGCHI LCTPE Series combines an ETFE inner layer with a PA12 outer layer for low-permeability fluid transfer in automotive and industrial SCR applications.
ETFE+PA12 Hose: Key Specifications
| Item | LCTPE Series |
|---|---|
| Tube Structure | ETFE + PA12 |
| Hardness | 60D |
| Working Fluid | DEF / AdBlue / Urea Solution |
| Temperature Range | -60°C to +125°C |
| Max. Working Pressure | Up to 2.0 MPa @ 20°C |
| Outer Diameter | 4–10 mm |
| Standard | SAE J844 |
| Standard Length | 100 m/roll |
Where Is ETFE+PA12 Hose Used?
The hose is designed for fluid-transfer lines in SCR and urea dosing systems. Typical equipment includes:
Heavy-Duty Diesel Trucks
In heavy-duty trucks, ETFE+PA12 hose can be used between the DEF tank, pump, filtration components and dosing unit. The hose carries DEF/AdBlue through the dosing circuit before the fluid reaches the injector.
Diesel Buses
For diesel buses equipped with SCR emission-control systems, the tubing is routed between DEF storage and dosing components. Its flexible construction allows the line to follow the vehicle structure while maintaining the required fluid path.
Off-Road Vehicles
Construction and agricultural vehicles can use SCR systems for diesel emission control. The hose connects the DEF delivery components and dosing system while being exposed to vibration and changing ambient temperatures.
Diesel Generators
Stationary diesel generators with SCR equipment use DEF lines to transfer urea solution from the storage tank to the dosing system. The tubing can be used for the connection between the fluid supply and metering components.
Marine Diesel Engines
Marine diesel engines equipped with SCR systems require a controlled supply of urea solution to the dosing unit. The hose is used as part of the DEF/urea fluid-transfer circuit.
How Is the Hose Connected in an SCR System?
A typical DEF flow path is:
DEF Tank → Pump → Filter → Dosing Unit → Injector → Exhaust System
The SCR tubing is installed between the fluid-handling components. Depending on the equipment design, the hose may connect the DEF tank to the pump, the pump to the filter, or the filtered fluid line to the dosing unit.
The tube is routed through the available installation space and connected with suitable fittings or connectors according to the equipment design.
Why Does ETFE+PA12 Use a Two-Layer Structure?
The two materials perform different functions.
ETFE inner layer
- Provides direct contact with DEF/AdBlue
- Offers chemical resistance
- Helps reduce fluid permeation
- Provides a stable inner surface for fluid transfer
PA12 outer layer
- Provides mechanical strength
- Maintains flexibility for routing
- Supports dimensional stability
- Helps the tube withstand vibration and installation movement
The combination allows the hose to address both fluid compatibility and mechanical requirements in the same tube structure.
ETFE+PA12 Hose vs. Standard PA12 Hose
For DEF and urea-fluid applications, the choice of tubing depends on the required chemical, permeability and mechanical performance.
| Property | ETFE+PA12 | Standard PA12 |
|---|---|---|
| Structure | ETFE + PA12 composite | PA12 |
| Chemical Resistance | High | Good |
| Permeability | Low | Higher than ETFE-based construction |
| Flexibility | Good | Good |
| Mechanical Strength | Good | Good |
| High-Temperature Capability | -60°C to +125°C | Depends on grade |
ETFE+PA12 construction is particularly relevant when low permeability and chemical resistance are important selection requirements.
Temperature and Pressure Range
The LCTPE Series is designed for a working temperature range of -60°C to +125°C.
The maximum working pressure is up to 2.0 MPa at 20°C. Actual pressure capability depends on tube size, temperature and system conditions, so the operating parameters should be checked against the specific application.
How to Select DEF or AdBlue Tubing
Before selecting DEF tubing, engineers should confirm:
- Fluid – DEF, AdBlue or another urea solution.
- Temperature – Minimum and maximum operating temperature.
- Pressure – Required working pressure at the actual operating temperature.
- Tube Size – OD, ID and available installation space.
- Routing – Bending radius, vibration and movement during operation.
- Connection – Fitting type and connection method.
- Length and Color – Required roll length, identification color and packaging.
LANGCHI ETFE+PA12 Hose for SCR Applications
LANGCHI manufactures LCTPE Series ETFE+PA12 hose, combining an ETFE inner layer with a PA12 outer layer for low-permeability fluid transfer.
The tubing is available in 4–10 mm OD, with a temperature range of -60°C to +125°C and pressure capability up to 2.0 MPa at 20°C.
Custom options include tube dimensions, colors, packaging and other requirements based on equipment specifications and drawings.
Frequently Asked Questions
What hose is used for DEF?
DEF systems commonly use tubing materials selected for chemical compatibility, temperature resistance and low permeation. LANGCHI LCTPE Series uses an ETFE+PA12 composite structure for DEF/AdBlue fluid transfer.
What is an SCR hose?
An SCR hose is tubing used to transfer DEF or urea solution between components of a Selective Catalytic Reduction system, such as the tank, pump, filter and dosing unit.
Is ETFE suitable for AdBlue?
ETFE provides chemical resistance and low permeability, making it suitable for applications where stable contact with DEF/AdBlue and controlled permeation are required.
What equipment uses DEF tubing?
DEF tubing can be found in SCR-equipped diesel trucks, buses, off-road vehicles, diesel generators, agricultural machinery and marine diesel engines.
Can ETFE+PA12 hose be customized?
Yes. LANGCHI can customize dimensions, colors, packaging and other tubing requirements according to application conditions and customer drawings.
Conclusion
For SCR applications requiring low-permeability DEF tubing, ETFE+PA12 combines the fluid-contact properties of ETFE with the mechanical and routing properties of PA12. The LCTPE Series is available for automotive and industrial SCR equipment in multiple sizes and colors.
