Organic Acid Technology (OAT)

Ethylene Glycol coolants usually contain compounds such as amines, phosphates, nitrites, borates and/or silicates. The mixture is far less environmentally friendly than a typical pure OAT coolant mix which usually contains none of the above. Hybrid (HOAT) coolants are generally moderately ‘silicated’ for improved aluminium protection.

Ethylene glycol coolants offer rapid protection of cooling system components. However, the inhibitors deplete rapidly meaning that frequent changes of coolant are needed to maintain effectiveness. Typical coolant life can be 30 – 50,000 miles. Pure OAT coolants take longer to protect the metallic components in the system. However, once the protective layer is laid down, the inhibitors deplete only very slowly. Coolant life is typically between 150 – 300,000 miles. The initial cost of OAT coolants is also generally lower than that of ethylene glycol coolant. Cost savings can therefore be significant.

Hybrid coolants (HOAT) offer a blend of the two benefits by using a moderate level of salts such as silicates or borates. The HOAT coolants offer rapid protection, long life (150,000 miles) and prevent clogging of water pumps etc. Traditional ethylene glycol coolants have little or no effect on hoses under normal working conditions. However, they can have an effect on certain types of reinforcement fabric used in the hoses.



LHSS - OAT Grade, offers an option between EPDM, blue coolant hose and fluoro-silicone hose, both from a cost and performance aspect.

The construction of the OAT hose eliminates some of the potential failure points of a fluoro-lined and ‘standard’ blue hose while out performing EPDM hose.

LHSS manufacture a high grade OAT resistant hose which also withstands much higher temperatures than conventional coolant hoses. Our OAT grade hose will operate in the range 150°C up to +230°C, making our OAT hose suitable for use in higher, under bonnet temperatures. Our OAT grade hose, also offers typically 30% higher burst pressure than standard coolant hoses.


Silicone Coolant Hose OAT Resistant

Silicone out performs conventional, organic hose materials, maintaining performance and flexibility over a wide temperature range, giving longer life and optimum reliability.

Hand built and available in a range of sizes and Shore hardness, our hoses resists hardening, cold leakage, high and low temperatures, varying pressures and is manufactured to resist OAT coolants and additives.

Meets or exceeds the requirements of SAE J20 R1 Class A. Our standard, green silicone hose (OSH) stock includes :
Straight hose (OSH) 6mm - 152mm ID in 1m, 2m or 3m lengths. 90 Degree elbows (OSH90) 6mm - 152mm ID with 102mm, 152mm or 250mm leg lengths. 45 Degree elbows (OSH45) 6mm - 152mm ID with 102mm or 152mm leg lengths. 90 Degree reducing elbows (OSHR90) with 102mm or 152mm leg lengths. 135 Degree elbows (OSH135) 6mm - 76mm ID with 102mm or 152mm leg lengths. ‘U’ BEND hoses (OSH180) 6mm - 76mm ID with 102mm or 152mm leg lengths. Straight reducers (OSHR) Wide range of sizes available.