Secondary/Primary Blend ZDDP
Secondary/primary blend ZDDP — balancing the fast anti-wear film formation of secondary ZDDP with the thermal stability of primary ZDDP. A tuned blend for balanced engine oil performance.
The balanced ZDDP that combines two strengths
Secondary ZDDP forms anti-wear films fast; primary ZDDP is thermally stable. A blend of the two lets formulators tune the balance of rapid wear protection and thermal durability.
Secondary/primary blend ZDDP combines two ZDDP types to balance their strengths. Secondary ZDDP decomposes at lower temperatures, giving faster anti-wear tribofilm formation for quick wear protection; primary ZDDP is more thermally stable for high-temperature durability. The blend delivers a tuned balance of rapid anti-wear response and thermal stability, well suited to engine oils that need both quick protection at start-up and durability at operating temperature. It provides the three core ZDDP functions — anti-wear, antioxidant and anti-corrosion — and is part of the antioxidant & anticorrosion range.
Secondary/Primary Blend ZDDP — typical properties
Representative typical values for secondary/primary blend 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 |
| Structure | Secondary + primary blend | Tuned balance |
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 secondary/primary blend ZDDP is used
Engine Oils
Balanced fast anti-wear and thermal durability for passenger car oils. See engine oil additives.
Mixed-Duty Oils
Suits oils needing both start-up protection and high-temperature stability.
Industrial Oils
Tuned anti-wear response for varied industrial operating conditions.
General-Purpose ZDDP
A versatile balanced option for many lubricant formulations.
Why formulators choose secondary/primary blend ZDDP
Balanced performance
Combines fast anti-wear film formation with thermal durability in one tuned blend.
Start-up + high-temp
Protects quickly at start-up and stays durable at operating temperature.
Formulation flexibility
The blend ratio can be tuned to the anti-wear and thermal balance required.
From sample drum to ISO tank
Sinolook supplies secondary/primary blend 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 secondary/primary blend ZDDP used for?
Why blend secondary and primary ZDDP?
Which gives faster anti-wear protection, secondary or primary ZDDP?
Is blend ZDDP suitable for passenger car oils?
Can Sinolook provide TDS, MSDS and COA?
Request secondary/primary blend 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.
Request a Quote