TPPT (Triphenyl Phosphorothionate)
TPPT (triphenyl phosphorothionate) — an ashless anti-wear and extreme-pressure additive widely used in zinc-free hydraulic oils, industrial gear oils and turbine oils for metal-free protection.
The ashless EP additive for zinc-free oils
TPPT is a leading ashless anti-wear and extreme-pressure additive, the go-to choice for zinc-free hydraulic oils, industrial gear oils and turbine oils needing metal-free protection.
TPPT (triphenyl phosphorothionate) is a widely used ashless anti-wear and extreme-pressure (EP) additive. Its aryl phosphorothionate structure forms protective films at metal contacts without contributing metal or ash, making it the leading ashless anti-wear choice for zinc-free hydraulic oils, industrial gear oils and turbine oils. It offers good thermal and hydrolytic stability and clean performance, supporting the filterability and air-release behaviour these oils require. TPPT is central to the trend toward ashless, zinc-free industrial lubricants and is part of the anti-wear agents range.
TPPT (Triphenyl Phosphorothionate) — typical properties
Representative typical values for TPPT. Indicative only — exact values vary by grade and are confirmed on the TDS and batch COA.
| Property | Typical Value | Method / Note |
|---|---|---|
| Appearance | Pale yellow liquid or low-melting solid | Visual |
| Phosphorus content | Present | Aryl phosphorothionate |
| Sulphur content | Present | EP film former |
| Ash | Ashless | Metal-free |
| Kinematic viscosity (100°C) | ~5–20 mm²/s | ASTM D445 |
| Flash point (COC) | > ~180 °C | ASTM D92 |
| Function | Ashless AW + EP | Zinc-free |
Typical values for guidance only — not a specification. Request the TDS for the specific grade you need; the COA reports actual measured values for your batch.
Where TPPT is used
Zinc-Free Hydraulic Oils
Leading ashless anti-wear for zinc-free HLP hydraulic oils. See hydraulic oil.
Industrial Gear Oils
Ashless EP for DIN 51517 CLP gear oils. See industrial & marine.
Turbine Oils
Clean ashless anti-wear maintaining air release and filterability.
Greases
Ashless EP support for grease formulations. See grease additives.
Why formulators choose TPPT
Leading ashless EP/AW
The go-to ashless anti-wear and extreme-pressure additive for zinc-free oils.
Clean performance
Good thermal and hydrolytic stability, supporting filterability and air release.
Zinc-free hydraulic ready
Central to the trend toward ashless, zinc-free hydraulic and industrial oils.
From sample drum to ISO tank
Sinolook supplies TPPT at any scale, from formulation samples to commercial bulk, to over 60 countries.
Frequently asked questions
What is TPPT used for?
Why is TPPT used in zinc-free hydraulic oils?
Does TPPT provide extreme-pressure protection?
How does TPPT compare with ZDDP?
Can Sinolook provide TDS, MSDS and COA?
Request TPPT from Sinolook
Tell us your target grade, application and volume — we'll send the TDS, a batch COA and a delivered quotation within 24 hours.
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