Zinc DialkyldithiophosphatesNova Additives

ZP-121

Zinc dialkyldithiophosphate — mixed primary/secondary C3/C4/C8

Deliberately mixed alkyl distribution to get both the fast filming of a secondary and the thermal ceiling of a primary in one component. The pragmatic choice for a blender who wants one ZDDP in the tank farm instead of three.

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Typical propertiesLiquid

Type: Mixed
Alcohol: C3/C4/C8
Zinc: 8.5 – 9.5%
Phosphorus: 8.2 – 8.8%
Sulphur: 16.4 – 17.6%
Oil: 20%

Typical values, not a specification. The binding specification is the one on the certificate of analysis issued against each batch.

Chemical identity

CAS number: 85940-28-9
EC number: 288-917-4

Cross-reference

Grades a formulator would benchmark ZP-121 against. Naming them is not a claim of equivalence — it is where to start the comparison.

Lubrizol 1395Afton HiTEC 7169Infineum C9425

The chemistry

Zinc Dialkyldithiophosphates

Antiwear, antioxidant and corrosion inhibitor in one molecule

Typical treat rate0.5 – 1.5 %

Still the most cost-effective antiwear chemistry ever commercialised. Primary alkyl ZDDPs are thermally more stable and preferred in industrial and heavy-duty applications; secondary alkyls decompose at lower temperature and film faster, which is why they dominate passenger-car engine oils. Alcohol chain length sets both the thermal stability and the hydrolytic stability.

Used in

Engine oilsHydraulic oilsIndustrial gear oilsAutomatic transmission fluidsGreasesCompressor oils

Where ZP-121 is specified

Engine Oils

Passenger-car, heavy-duty and gas engine crankcase formulations, including low-SAPS.

Industrial Gear Oils

Enclosed gear drives, wind turbine gearboxes and heavy industrial reducers.

Hydraulic Fluids

Anti-wear hydraulic oils, including zinc-free and fire-resistant fluids.

Driveline & Transmission

Automatic and manual transmission fluids, axle oils, EV reduction-gear fluids.

Other grades in ZDDP

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Documentation

A full technical data sheet, safety data sheet in the language of the receiving country, REACH status statement and SVHC declaration are issued with every enquiry for ZP-121. Certificates of analysis accompany each consignment and retained samples are held for the full shelf life.

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