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OAT Hoses (Organic Acid Technology / Euro 6 Coolant Hoses)

Engineered for modern cooling systems, OAT hoses (Organic Acid Technology hoses) are specifically designed to withstand the chemical and thermal demands of Euro 6 engines, POSH systems, and extended-life coolant environments.

Unlike standard silicone hoses, OAT hoses are formulated to resist the aggressive organic acid compounds found in modern coolants, delivering long-term durability, higher burst pressures, and superior resistance to heat and chemical degradation.

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Organic Acid Coolant Resistant Hoses

OAT hoses are widely used across industries where modern cooling systems and high-performance engines are critical

  • Designed for OAT & HOAT coolants
  • Suitable for Euro 6 & high-performance engines
  • High temperature and pressure resistance
  • OEM-grade reliability for demanding applications

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  • Known As

    • OAT
    • Organic Acid Technology
    • POSH (Peroxide-cured Organic Silicone Hose)
    • BOAT (Blue OAT)
    • DOAT
    • GOAT (Grey OAT)
    • BKOAT (Black OAT)
    • EURO 6
    • HOAT (Hybrid OAT)

  • Key Features and Benefits

    • Chemical Resistance – Formulated to withstand organic acid-based coolants, preventing premature degradation.
    • Extended Service Life – Designed to match the lifespan of extended-life coolants.
    • High Temperature Performance – Capable of operating in environments ranging from -50°C to +200°C and beyond, depending on specification.
    •  Increased Pressure Capability – 30% higher burst pressure than standard silicone hose.
    • Reduced Maintenance & Downtime – Eliminates some potential failure points of fluorolined silicone while outperforming EDPM.

  • What OAT Hoses Are Used For

    • Automotive (OEM & performance vehicles)
    • Commercial vehicles and heavy duty fleets
    • Fuel cell cooling systems
    • Industrial machinery

  • Sizes, Lengths, Angles

    • Inner diameters (ID): From 6mm to 152mm
    • Straight: Available as standard in 1, 2, 3 and 4 metre lengths. Other lengths can be requested.
    • Elbows: 45°, 90°, 135°, 180° with leg lengths from 102mm to 250mm. Bespoke parts also available.
    • Colours: Forest Green is the standard colour. Our full range of colours is available upon request.

With the introduction of Euro 6 emissions standards, engines operate at:

  • Higher temperatures
  • Greater pressures
  • More chemically aggressive coolant environments

OAT coolants are now standard in these systems due to their efficiency and longevity, but they require hoses specifically engineered to:

  • Prevent permeation and coolant loss
  • Resist chemical softening from organic acids
  • Maintain structural integrity under continuous stress

OAT hoses are therefore critical to system reliability, compliance, and long-term performance.

LHSS OAT Hose Capability

At LHSS, our OAT hoses are:

  • Specifically developed for Euro 6 service conditions
  • Extensively tested under high temperature and pulsating pressure environments
  • Manufactured using multi-ply reinforced silicone construction
  • Designed to outperform EPDM and standard silicone hoses

Our hoses are trusted globally by OEMs and operators requiring reliability in the most demanding environments.

As a trusted leading brand, all of our hoses and tubing are produced using the best quality material and the highest quality production processes allowing us to meet or exceed all manufacturing, quality, performance and safety standards.

  • What does OAT stand for in hoses?

    OAT stands for Organic Acid Technology, referring to the type of coolant the hose is designed to work with. These coolants use organic acids to prevent corrosion and extend service life.

  • Are OAT hoses different from standard silicone hoses?

    Yes. Standard silicone hoses can degrade when exposed to organic acid coolants, whereas OAT hoses are specifically engineered to resist these chemicals and maintain performance over time.

  • What is a Euro 6 hose?

    A Euro 6 hose is designed to operate in modern engines that meet Euro 6 emissions standards, where higher temperatures and OAT coolants are used. OAT hoses are commonly referred to as Euro 6 hoses.

  • What is POSH in relation to hoses?

    POSH (Peroxide-cured Organic Silicone Hose) is another term used within the industry to describe hoses engineered for compatibility with modern coolant chemistries, including OAT systems.

  • Can OAT hoses be used with all coolants?

    OAT hoses are optimised for OAT and HOAT coolants, but compatibility should always be confirmed based on the specific chemical composition of the coolant.

  • Why do standard hoses fail with OAT coolant?

    Organic acids in OAT coolants can soften or degrade traditional hose materials, leading to swelling, permeation, and eventual failure if the hose is not correctly specified.

  • What industries use OAT hoses?

    OAT hoses are used in automotive OEM and performance vehicles, commercial and heavy-duty fleets, fuel cell cooling systems, and a wide range of industrial machinery where high-performance coolant handling is required.

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