INTRODUCTION
Zinc Dialkyl Dithio Phosphate (ZDDP) belongs to a family of coordination compounds classified as members of transition metal dithiophosphate. ZDDP is widely used based on a combination of different selected alcohols thus providing antiwear performance and enhanced thermal and hydrolytic stability. In combination with other additives, it is especially used for the formulation of hydraulic fluids, industrial gear oils, metalworking fluids, greases and automotive engine oils.
Manufacture
The most used industrial method is through reaction of phosphorus pentasulfide (P₂S₅) with selected alcohols under controlled temperature to form dialkyl dithiophosphoric acid. The reaction is followed by neutralising the intermediate with a zinc source (e.g., ZnO), then filter and dry to obtain zinc dialkyldithiophosphate (ZDDP).
| Synonyms | Phosphorodithioic acid, mixed O,O-bis(2-ethylhexyl and iso-Bu and iso-Pr) esters, zinc salts ) |
| CAS no. | 85940-28-9 |
| EINECS no. | 288-917-4 |
| Molecular formula | Zn[(RO)2PS2]2 |
| Structure |  |
Applications
ZDDP is a proven, industry-trusted additive designed to enhance lubricant performance and protect critical equipment under the most demanding conditions.
| Automotive Engine Oils : |
| Used in passenger car and heavy-duty engine oils to protect critical components like: |
| ➢ Camshafts |
| ➢ Lifters |
| ➢ Pistons |
| Reduces metal-to-metal wear under high pressure |
| Industrial Lubricants : |
| It is used in |
| ➢ Gear oils |
| ➢ Compressor oils |
| ➢ Turbine oils |
| Enhances oxidation stability and extends lubricant life |
| Hydraulic Fluids: |
| Prevents wear in hydraulic pumps and valves Improves system reliability under high load conditions |
| Metalworking & Industrial Applications : |
| Used in cutting fluids and metal-forming oils Reduces friction and tool wear during machining |
| Specialty & High-Performance Lubricants : |
| Widely used in |
| ➢ Aviation lubricants |
| ➢ Racing oils (higher ZDDP for extreme conditions) |
| ➢ Marine engine oils |
SPECIFICATIONS
| Test | Unit | Specification |
|---|---|---|
| Appearance | – | Bright Yellow Liquid |
| Density @15.6⁰C | g/ml | 1.10 – 1.20 |
| Viscocity @40⁰C | cSt | 350 – 600 |
| Viscocity @100⁰C | cSt | 10.0 – 20.0 |
| Flash Point, open cup | O C | Min 130 |
| Zinc content | % | 10.5 – 11.0 |
| Phosphorus content | % | 9.0 – 11.0 |
| Sulphur content | % | 18.0 – 22.0 |
PACKING
200/220 Kg UN approved M.S. Drums
STORAGE
Store in a cool, well-ventilated place, out of direct sunlight
REACH status
Registered
ExSyn offers Zinc Dialkyl Dithio Phosphate (ZDDP) on commercial scales and welcomes enquiries. No matter the quantity you need, our exceptional quality and service will make ExSyn your supplier of choice! If you need any additional information or SDS, please contact us.
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