Trimethylolpropane trioleate

Trimethylolpropane trioleate (CAS 57675-44-2) is a synthetic ester derived from trimethylolpropane and oleic acid. Also marketed as Nissan Unister H-381.

Where is Trimethylolpropane trioleate used?

• Lubricants: base fluid and lubricity additive in high-performance formulations
• Compressor oils: base oil component in fully synthetic and semi-synthetic lubricants
• Gear oils and hydraulic fluids for extended service intervals
• Metalworking fluids: improves lubricity in cutting and forming, reducing tool wear in precision machining
• Plasticizer in specialty polymer and rubber compounding compatible with oleate-based systems
• Energy sector: turbine and circulating oil formulations
• It offers strong oxidative stability and low-temperature fluidity.
• Used in high-temperature chain oils.
• Acts as a phthalate-free plasticizer in plastics.
• Widely used in the manufacture of PVC-based products such as vinyl flooring, cables and synthetic leather.
• Used as a key ingredient in the manufacture of polyurethane coatings and resins.

Formulation notes

• Compatible with several conventional additives for mineral oils.
• Can replace sulfurized lard and tall oil.
• For fire-resistant hydraulic oil (HFD-U), the recommended treatment rate is 98%.

Typical specification

• Kinematic viscosity at 40°C is 42-50 mm²/s.
• Acid value is at most 1 mgKOH/g.
• Pour point is less than or equal to -35°C.
• Flash point (COC) is ~ 320 °C (320°C).
• Viscosity index is at least 180.

Storage, packaging and handling

• Recommended maximum storage temperature is 45°C.
• Store in a cool, dry place away from any heat and moisture sources.

Frequently asked questions about Trimethylolpropane trioleate

For which hydraulic fluid grades is it an ideal base oil?

It is an ideal base oil for HFDU (fire-resistant hydraulic oil) hydraulic fluids of grades 32, 46 and 68.

Technical content is compiled and updated by the SoleChem product team from public technical sources; the certificate of analysis (COA) governs product-specific specifications.