Primary ZDDP
Primary ZDDP — primary-alkyl zinc dialkyldithiophosphate delivering anti-wear, antioxidant and anti-corrosion protection with good thermal stability. The thermally robust ZDDP for high-temperature service.
The triple-function additive at the heart of every engine oil
ZDDP is the most important single additive in lubrication — one molecule delivering anti-wear, antioxidant and anti-corrosion protection. The primary-alkyl type adds thermal robustness.
Primary ZDDP (zinc dialkyldithiophosphate) is built from primary alcohols, giving it good thermal stability alongside the three core ZDDP functions: anti-wear (forming a protective tribofilm at metal contacts), antioxidant (decomposing peroxides that degrade the oil), and anti-corrosion. The primary-alkyl structure decomposes at higher temperatures than secondary ZDDP, making it well suited to high-temperature applications and where thermal durability is prized, such as industrial and certain engine oils. ZDDP is central to engine oil, hydraulic oil and many industrial lubricant formulations.
Primary ZDDP — typical properties
Representative typical values for primary ZDDP. Indicative only — exact values vary by grade and are confirmed on the TDS and batch COA.
| Property | Typical Value | Method / Note |
|---|---|---|
| Appearance | Light yellow to amber liquid | Visual |
| Zinc content | ~9–11 wt% | Grade-dependent |
| Phosphorus content | ~8–10 wt% | Grade-dependent |
| Sulphur content | ~15–18 wt% | Grade-dependent |
| Kinematic viscosity (100°C) | ~5–12 mm²/s | ASTM D445 |
| Flash point (COC) | > ~170 °C | ASTM D92 |
| Thermal stability | Good (primary alkyl) | Higher than secondary |
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 primary ZDDP is used
Engine Oils
Anti-wear and antioxidant protection for the valvetrain and bearings. See engine oil additives.
Hydraulic Oils
Zinc anti-wear for zinc-type HLP hydraulic oils. See hydraulic oil.
Industrial Oils
Thermally stable anti-wear and oxidation control for industrial lubricants.
High-Temperature Service
Primary structure suits applications needing thermal durability.
Why formulators choose primary ZDDP
Triple function
Anti-wear, antioxidant and anti-corrosion protection from a single proven additive.
Good thermal stability
Primary-alkyl structure decomposes at higher temperatures than secondary ZDDP.
Proven and versatile
The lubrication industry's most important anti-wear/antioxidant additive.
From sample drum to ISO tank
Sinolook supplies primary ZDDP 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 ZDDP used for?
What is the difference between primary and secondary ZDDP?
How does ZDDP protect against wear?
Why is ZDDP phosphorus limited in modern oils?
Can Sinolook provide TDS, MSDS and COA?
Request primary ZDDP 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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