Alkylated Diphenylamine
Alkylated diphenylamine (ADPA) — the leading high-temperature aminic antioxidant. An ashless primary antioxidant delivering outstanding oxidation protection where oils run hot.
The high-temperature antioxidant of choice
When oils run hot, aminic antioxidants outperform phenolics. Alkylated diphenylamine (ADPA) is the leading aminic antioxidant, delivering outstanding high-temperature oxidation protection.
Alkylated diphenylamine (ADPA) is the leading aminic antioxidant and a workhorse of high-temperature lubrication. As an ashless primary (radical-scavenging) antioxidant, it is exceptionally effective at high temperatures, where it outperforms phenolic antioxidants — making it essential in engine oils, turbine oils, high-temperature industrial oils and greases. It is very often combined with a phenolic antioxidant, the two working together synergistically across a broad temperature range. ADPA is ashless and part of the antioxidant & anticorrosion range, valued wherever oxidation resistance over long, hot service is critical.
Alkylated Diphenylamine — typical properties
Representative typical values for alkylated diphenylamine. Indicative only — exact values vary by grade and are confirmed on the TDS and batch COA.
| Property | Typical Value | Method / Note |
|---|---|---|
| Appearance | Amber to dark liquid | Visual |
| Nitrogen content | Present (amine) | Aminic structure |
| Kinematic viscosity (100°C) | ~10–40 mm²/s | ASTM D445 |
| Flash point (COC) | > ~180 °C | ASTM D92 |
| Density (20°C) | ~0.95–1.05 g/cm³ | Typical |
| Ash | Ashless | No metal |
| Type | Primary (radical scavenger) | Aminic, high-temp |
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 alkylated diphenylamine antioxidant is used
Engine Oils
High-temperature oxidation protection over long drains. See engine oil additives.
Turbine Oils
Outstanding long-life oxidation protection for hot turbine service. See industrial & marine.
High-Temperature Grease
The preferred antioxidant for grease running hot in bearings. See grease additives.
Industrial Oils
High-temperature stability for demanding industrial lubricants.
Why formulators choose alkylated diphenylamine antioxidant
Outstanding high-temp protection
The leading aminic antioxidant — outperforms phenolics where oils run hot.
Synergy with phenolics
Combines with phenolic antioxidants for broad-temperature protection.
Ashless and versatile
No sulphated ash; used across engine, turbine, grease and industrial oils.
From sample drum to ISO tank
Sinolook supplies alkylated diphenylamine antioxidant at any scale, from formulation samples to commercial bulk, to over 60 countries.
Other antioxidant & anticorrosion additives
Explore the rest of the antioxidant & anticorrosion additive range:
Frequently asked questions
What is alkylated diphenylamine (ADPA) used for?
Why are aminic antioxidants better at high temperatures?
Why combine ADPA with a phenolic antioxidant?
Is ADPA suitable for high-temperature grease?
Can Sinolook provide TDS, MSDS and COA?
Request alkylated diphenylamine antioxidant 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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