High-Molecular Phenolic Ester Antioxidants
High-molecular phenolic ester antioxidants — hindered phenolic antioxidants with high molecular weight for very low volatility, ideal for high-temperature and long-life oils.
The low-volatility phenolic for high-temperature oils
By building the hindered phenol onto a high-molecular-weight ester backbone, these antioxidants resist evaporation — staying in the oil to protect it at high temperatures over long service.
High-molecular phenolic ester antioxidants attach the hindered-phenol antioxidant function to a high-molecular-weight ester backbone, dramatically reducing volatility. Lower-molecular-weight phenolics like DBPC can evaporate at high temperatures, reducing their long-term effectiveness; the high-MW ester structure keeps the antioxidant in the oil where it is needed, giving superior high-temperature and long-life oxidation protection. This makes them valuable in modern low-SAPS engine oils, high-temperature industrial oils and long-drain applications. They are ashless and part of the antioxidant & anticorrosion range.
High-Molecular Phenolic Ester Antioxidants — typical properties
Representative typical values for high-molecular phenolic ester antioxidants. 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 |
| Molecular weight | High | Low-volatility design |
| Volatility | Very low | Stays in oil at high temp |
| Density (20°C) | ~0.95–1.05 g/cm³ | Typical |
| Flash point (COC) | > ~180 °C | ASTM D92 |
| Ash | Ashless | No metal |
| Type | Primary (radical scavenger) | Hindered phenol ester |
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 high-molecular phenolic ester antioxidant is used
Low-SAPS Engine Oils
Low-volatility oxidation protection for modern long-drain engine oils. See engine oil additives.
High-Temperature Industrial Oils
Stays in the oil to protect at elevated temperatures.
Turbine Oils
Long-life oxidation protection for ultra-long-drain turbine oils. See industrial & marine.
Long-Drain Applications
Resists evaporation for sustained protection over extended service.
Why formulators choose high-molecular phenolic ester antioxidant
Very low volatility
High molecular weight keeps the antioxidant in the oil at high temperatures — no evaporation loss.
Long-life protection
Sustained oxidation protection over extended drain intervals.
Ashless, low-SAPS friendly
No sulphated ash — ideal for modern low-SAPS and high-temperature oils.
From sample drum to ISO tank
Sinolook supplies high-molecular phenolic ester 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 are high-molecular phenolic ester antioxidants used for?
Why does low volatility matter in an antioxidant?
How do phenolic ester antioxidants differ from DBPC?
Are these suitable for low-SAPS engine oils?
Can Sinolook provide TDS, MSDS and COA?
Request high-molecular phenolic ester 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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