Technical Specifications
| Property | Unit | Typical Value | Test Method |
|---|---|---|---|
| Appearance | Yellow transparent liquid | Visual | |
| Flash Point | °C | 150 | ASTM D93 |
| Density at 20 °C | kg/m³ | 998 | ASTM D4052 |
| Viscosity at 50 °C | mm²/s | 12 | ASTM D445 |
| Total Base Number | mgKOH/g | 215 | ASTM D2896 |
| Color | 1.5 | ASTM D1544 | |
| RPVOT (BVOT) | min | 95 | ASTM D2272 |
| Solubility (mineral Group I/II/III) | % | >10 | — |
* Typical values from batch production. Batch-specific COA available on request.
Technical content reviewed by the CheMost additives team · Specifications last reviewed
Molecular Structure
Molecular structure · benzotriazole metal deactivator
Oil-soluble benzotriazole (tolyltriazole) aminomethyl derivative — benzotriazole ring + aminomethyl + branched amine (ash-free, no metal)
An oil-soluble, liquid benzotriazole derivative — the benzotriazole ring chemisorbs on copper; the aminomethyl/amine group makes it oil-soluble and basic.
What Is the Benzotriazole Derivative Metal Deactivator (CCI51)?
CheMost-CCI51 is an oil-soluble, oxidation-resistant metal deactivator and copper corrosion inhibitor — an aminomethyl (Mannich) derivative of benzotriazole (a methylbenzotriazole/tolyltriazole derivative). It effectively inhibits the corrosion of copper and other metals, and is supplied as an easy-to-add yellow liquid.
Benzotriazole is the classic copper-and-yellow-metal passivator: the triazole ring chemisorbs onto the metal to form a protective barrier film that both stops corrosion and removes copper’s catalytic effect on oil oxidation. Pure benzotriazole (BTA) is a solid, though; turning it into an aminomethyl derivative makes it oil-soluble and liquid for direct addition into finished oils, and gives it a high base number (TBN 215) from the amine group.
Two formulation points define how CCI51 is used, both noted on the data sheet: it is synergistic with phenolic antioxidants such as BHT, and — because of its basic amine structure — direct contact with ZDDP should be avoided. It is ash-free and suited to many lubricant types.
How CCI51 Works
Triazole chemisorbs on copper
The benzotriazole ring bonds to the copper surface to form a tightly-held barrier film, passivating copper and yellow metals against corrosion.
Oil-soluble, liquid form
The aminomethyl derivatisation makes the triazole oil-soluble and pourable, so it can be metered straight into finished oils — unlike solid benzotriazole, which must be dissolved.
Synergy with phenolic antioxidants
By removing copper’s oxidation catalysis, it works hand-in-hand with phenolic antioxidants; the data sheet notes synergy with BHT.
Keep separate from ZDDP
Because of its basic amine structure, direct contact with ZDDP should be avoided — add the two at different points in the blend rather than pre-mixing them.
Metal Deactivators Compared — Where CCI51 Fits
CheMost offers both classic copper-passivation routes plus the solid benzotriazole. The table places CCI51 against them so you can pick by heterocycle, form and the system you are protecting. All figures are from each grade’s data sheet.
| Grade | Heterocycle | Form | Best for |
|---|---|---|---|
| CCI51 (this page) | Benzotriazole derivative | Liquid, oil-soluble | General copper passivation; synergy with phenolic antioxidants |
| CCI61 | Thiadiazole (DMTD), S 27.5% | Liquid, oil-soluble | Copper protection in high-sulfur / active-sulfur EP systems |
| Benzotriazole (BTA) | Benzotriazole | Solid (granules) | The pure, granular copper corrosion inhibitor / VCI |
CCI51 is the liquid, oil-soluble way to get benzotriazole copper protection — choose it over solid BTA when pourable handling and direct addition matter; choose the thiadiazole when the system carries active sulfur.
Applications
CheMost-CCI51 is used as the copper corrosion inhibitor / metal deactivator in formulations targeting the duties below:
Industrial & turbine oils
Copper and yellow-metal passivation in industrial, turbine and circulating oils, where copper catalysis must be suppressed for long oil life.
Hydraulic oils
Protection of bronze and brass components in hydraulic systems, dosed as an easy-to-handle liquid.
Engine oils & greases
Copper/lead bearing protection and oxidation-catalysis control in engine oils and greases.
Metalworking fluids
Copper and yellow-metal corrosion control in metalworking oils and fluids.
Finished-oil performance approvals belong to the fully formulated oil, not to an individual additive component.
Treat Rate
The data sheet specifies the product but not a per-application dosage, so the figures below are indicative, derived from the chemistry and our formulating experience — confirm the final level.
First-order estimate. Triazole metal deactivators work at very low treat — roughly 0.02–0.5% (often below 0.1%), dosed to a copper-strip (ASTM D130) target. A small amount passivates the copper surface; over-treating gives little extra benefit.
Add CCI51 to work with the phenolic antioxidant system, and pre-blend it separately from ZDDP to avoid direct contact. The exact level depends on the copper content of the system and the rest of the package.
Treat rates are indicative, not fixed dosages. CheMost can provide formulation and treat-rate support on request.
Formulating With CCI51 — Complementary Additives
Phenolic antioxidant (BHT)
The data sheet notes CCI51 is synergistic with BHT: removing copper’s oxidation catalysis lets the phenolic antioxidant protect the oil more effectively.
Thiadiazole metal deactivator
For broad protection, the benzotriazole and thiadiazole routes can be combined — the thiadiazole adds reactive-sulfur protection in high-sulfur systems.
ZDDP (keep separate)
ZDDP is a normal co-additive, but because of CCI51’s basic structure, the two should not be in direct contact — add them at different stages of the blend.
Solid benzotriazole (BTA)
Where the solid granular form is preferred (or for vapour-phase corrosion inhibition), the pure benzotriazole is the alternative form of the same copper chemistry.
Documentation, Qualification & Regulatory Support
Standard documentation — Certificate of Analysis (COA, per shipment), Technical Data Sheet (TDS) and Safety Data Sheet (SDS, GHS/CLP) — is provided. The full TDS is available on request rather than as a public download. Additional support is available on request:
Regulatory documentation
REACH, TSCA and country-specific market-registration documentation support available on request.
Third-party inspection
SGS / Intertek / BV pre-shipment inspection can be arranged on request.
Custom grades & packaging
Custom packaging and grades on request.
Formulation support
Metal-deactivator and treat-rate guidance from our technical team.
Packaging & Supply
CheMost-CCI51 is stocked and shipped worldwide, with a typical lead time of 1–15 days and a 36-month shelf life at ambient temperature. Samples and quotations are answered within 12 hours.
Packaging
25 kg metal drum · 200 kg metal drum.
Minimum order
By drum — contact us for your quantity.
Incoterms
FOB · CIF · EXW, to suit your freight arrangement.
Loading ports
All major Chinese ports.
Frequently Asked Questions
What is a benzotriazole derivative metal deactivator?
It is an oil-soluble copper corrosion inhibitor made by converting benzotriazole into an aminomethyl (Mannich) derivative — a methylbenzotriazole/tolyltriazole derivative. The triazole ring passivates copper and yellow metals; the amine group makes it a pourable liquid with a high base number (TBN 215) for direct addition into finished oils.
How is it different from solid benzotriazole (BTA)?
Same copper-passivating chemistry, different form. Pure BTA is a solid that must be dissolved; CCI51 is the oil-soluble liquid derivative that meters straight into the oil. Choose CCI51 for pourable handling and direct addition; choose solid BTA where the granular form or vapour-phase inhibition is wanted.
Why should I avoid contact with ZDDP?
CCI51’s basic amine structure can interact directly with ZDDP, so the data sheet advises against direct contact. In practice, add the two at different points in the blend rather than pre-mixing them; both can still be in the finished oil.
What treat rate should I use?
Triazole metal deactivators work at very low levels — typically about 0.02–0.5% (often below 0.1%), dosed to a copper-strip (ASTM D130) target. The exact level depends on the copper content of the system and the rest of the package; our technical team can assist.
How is it supplied, and how fast can I get a sample?
It is supplied as a yellow liquid in 25 kg and 200 kg metal drums with a 36-month shelf life, and shipped worldwide. As a manufacturer and sourcing partner (Est. 2013), CheMost answers sample and quotation requests within 12 hours.