Castrol Carelube HTG hydraulic fluid is formulated from natural vegetable oils to be more readily biodegradable and environmentally acceptable than traditional mineral-based fluids. Since hydraulic systems are prone to leakage due to high pressures, Carelube HTG is an excellent hydraulic fluid in applications where leakage could cause water or soil contamination.
Carelube HTG is recommended for outdoor applications where leakage could result in soil or ground water contamination. It is more than 95% biodegradable as measured in CEC L-33-T-82 tests and these tests indicate that it is capable of being decomposed by biological agents within 120 hours. This is unlike standard mineral oils, which may remain intact for much longer and can lead to soil and water pollution.
It is important to understand environmental claims as they pertain to lubricants. In 2012, the FTC updated green guidelines for general environmental marketing claims to include the requirement that unqualified benefit claims need to be substantiated. You can find more information in Section 260.4 in the following online document: https://www.ftc.gov/sites/default/files/attachments/press-releases/ftc-issues-revised-green-guides/greenguides.pdf
In addition to its biodegradability, Carelube HTG has a very low toxicity before, during and after breakdown. This reduces the threat to humans, fish and other wildlife coming in contact with contaminated water. Carelube HTG has a very high viscosity index (VI) of 200. Standard mineral hydraulic oils have a VI of around 100. This extra-high VI means that Carelube HTG experiences little change in viscosity during its recommended operating range of 0°F to 175°F. It is also very shear-resistant when used in high-shear applications.
To learn more about Carelube HTG hydraulic fluid and to see industry test results, please visit the Castrol GPS (Guide to Products & Services) website at www.castrol.com/gps.