The Material Code Behind the Colors
The colors of urea tubing aren't chosen randomly; each color corresponds to different material properties:
Red Tubing: Typically made of high-temperature resistant nylon, maintaining flexibility in environments ranging from -40℃ to 120℃, suitable for high-temperature areas in engine compartments.
White Tubing: Mostly made of polyethylene, emphasizing corrosion resistance; it doesn't age easily even after prolonged contact with urea solution.
Green Tubing: Commonly found in composite material designs, possessing both UV resistance and freeze-cracking resistance, suitable for exposed installation.
The Invisible Map of Usage Scenarios
The different colored urea tubing acts like traffic lights, silently guiding the installation location:
Red Alert Zone: Engine... High-temperature zones are the preferred choice, such as piping near turbochargers.
White Safety Zone: The section from the urea tank to the pump body, where frequent contact with urea solution is required.
Green Passage Zone: Areas exposed to sun and rain, such as the outer side of the chassis, where weather changes must be considered.
Pipe Selection Guide: These practical tips can help you avoid pitfalls:
In areas with winter temperatures below -20℃, green pipes are recommended due to their superior freeze resistance.
For modified vehicles, pay attention to the temperature rating of red pipes; some aftermarket parts need to withstand temperatures above 150℃.
White pipes typically have a shorter replacement cycle than red pipes (1-2 years), so plan your maintenance in advance.
When using mixed materials, ensure the interface materials are compatible to avoid electrochemical corrosion.
