SODIUM TOLYLTRIAZOLE

Sodium Tolyltriazole is a water-soluble corrosion inhibitor used particularly to protect copper, brass, and copper alloys against corrosion.
Sodium Tolyltriazole is used in metalworking fluids, antifreeze products, cooling systems, water treatment applications, and industrial cleaners.
Sodium Tolyltriazole helps reduce oxidation and surface deterioration by forming a protective layer on metal surfaces.

CAS Number: 64665-57-2
EC Number: 265-004-9
Molecular Formula: C₇H₆N₃Na
Molecular Weight: 155.13 g/mol
DTXSID: DTXSID4028125

Synonyms: TTA·Na, TTAS, TTA-S, TT-50, TT-85, Tolyltriazole sodium salt, Tolytriazole sodium salt, Sodium tolyltriazole, Sodium tolyl triazole, Sodium 4(or 5)-methyl-1H-benzotriazolide, 1H-Benzotriazole 4(or 5)-methyl- sodium salt, Sodium 4-tolyltriazole, 1-H-Methylbenzotriazole sodium salt, Methyl-1H-benzotriazole sodium salt, Methylbenzotriazole sodium salt, Sodium salt of methylbenzotriazole, Tolytriazole 50% sodium salt solution, Tolytriazole 85% Na-salt, PMC Cobratec TT-85, Cobratec TT-50S, Cobratec TT-85, Preventol CI 750, COTT85, DTXSID4028125, UNII 27034S05ER, EINECS 265-004-9, CAS 64665-57-2
Sodium Tolyltriazole is the sodium salt form of Tolyltriazole and can be easily incorporated into aqueous formulations.
Sodium Tolyltriazole supports the protection of copper-containing equipment in closed-loop cooling systems.

Sodium Tolyltriazole can contribute to long-lasting metal protection in automotive and industrial fluids.
Sodium Tolyltriazole can be combined with different anticorrosion components in multi-component inhibitor systems.

Sodium Tolyltriazole helps preserve the appearance and functional properties of metal surfaces.
Sodium Tolyltriazole is an effective and versatile additive for water-based industrial formulations.

A pale yellow to amber, clear alkaline liquid in its commercial 50% aqueous solution form (TT-50), sodium tolyltriazole is the water-soluble, directly dosable ionic form of tolyltriazole — providing the same copper and yellow metal corrosion inhibition mechanism as neutral TTA (chemisorption via N → Cu coordination bonds to form a multilayer, insoluble Cu–TTA coordination polymer passivation film) while offering substantially higher water solubility (664 g/L at 20°C vs. negligible for solid TTA), complete miscibility with glycols, full compatibility with highly alkaline systems (pH above 10 and below 2, where solid TTA is preferred over benzotriazole), and the practical advantage of simple dilution dosing without prior dissolution.
Sodium tolyltriazole is superior to solid TTA in aqueous formulation applications because in alkaline media (pH >7) the tolyltriazolate anion (the deprotonated form of TTA, pKa 8.37 for TTA / 8.85 for TTA·Na) is the dominant species in solution and provides the same corrosion inhibition efficiency as neutral TTA; TT-50 eliminates the need for pre-dissolution in alcohol or alkali before dosing into the water system, allows fast and accurate treatment solution preparation at any concentration from <0.5 to 6% (typical industrial dosing range: 2–10 mg/L), and is effective at lower odour levels than benzotriazole sodium salt.

Uses of Sodium Tolyltriazole:
Sodium tolyltriazole is used as the primary copper and yellow metal corrosion inhibitor in open and closed recirculating cooling water systems — cooling towers, heat exchangers, chilled-water HVAC circuits, district cooling systems, and condenser circuits — dosed directly into the circulating water at 2–10 mg/L (active TTA·Na) by continuous or slug-dose addition; it forms a stable Cu–TTA passivation film on copper tube surfaces, protecting against pitting corrosion, galvanic attack, and copper ion release; TT-50 can be used in combination with phosphonates, phosphates, molybdates, scale inhibitors, and biocides in complete water treatment programmes.
Sodium tolyltriazole is used in automotive antifreeze and engine coolant formulations (ethylene glycol and propylene glycol based, OAT and HOAT types) as the copper and yellow metal corrosion inhibitor, at concentrations of 0.01–2.0%; TT-50 is preferred over solid TTA in coolant concentrate production because it dissolves instantly in glycol-water blends without requiring pre-dissolution; it protects copper, brass, and aluminium components of the cooling system — radiators, heater cores, water pump impellers — across the full service temperature and pH range of the coolant.

Sodium tolyltriazole is used in metalworking fluids — water-miscible cutting oils, grinding fluids, rolling lubricants, and forming fluids — as a copper alloy corrosion inhibitor, preventing staining, discolouration, and pitting of brass and bronze workpieces and machine components; it is also used in phosphate conversion coating baths for yellow metals; in electroplating and electropolishing bath formulations; and in pickling, cleaning, and passivation solutions for copper and copper alloys.
Sodium tolyltriazole is used in aircraft runway deicer and anti-icing fluid formulations (Type I/II/III/IV ADAF) as the copper corrosion inhibitor, in combination with other inhibitors; in gas dehydration vessels and natural gas processing fluids as a metal passivation agent; in water-based lacquers, waxes, soap cleaners, detergents, and industrial surface cleaners; and in strong alkali or acid cleaners where compatibility with high or low pH systems is required (pH below 2 or above 10, where TT-50 is specifically recommended over solid BTA).
Sodium tolyltriazole is used in specialty lubricant formulations — hydraulic fluids, compressor oils, and turbine oils — as a metal deactivator and copper corrosion inhibitor; in anti-rust oils and greases as a vapour-phase corrosion inhibitor (VCI) for copper and copper alloy surfaces; in closed circulating cooling water systems in combination with scale inhibitors and biocides; and in air conditioning systems and absorption chiller circuits where copper and aluminium protection is required simultaneously.
Sodium tolyltriazole is used synergistically with 2-mercaptobenzothiazole (MBT) for enhanced copper corrosion inhibition on heavily corroded metal surfaces (initial dosage 5–10× normal; maintenance dosage 2–10 mg/L); it can also be used synergistically with sodium benzoate, borax, silicates, nitrates, molybdates, and phosphates in multi-component corrosion inhibitor packages; it functions as a metal deactivator, extreme-pressure additive auxiliary, antioxidant in internal combustion engine oil, and cadmium, nickel, and stainless steel surface passivator.

Benefits and Advantages of Sodium Tolyltriazole:
Sodium tolyltriazole (TT-50) provides the same copper corrosion inhibition mechanism and performance as solid neutral tolyltriazole while offering dramatically superior water solubility (664 g/L at 20°C), complete miscibility with water at any proportion, excellent solubility in glycols, and direct dosability without pre-dissolution — eliminating the significant formulation challenge of dissolving solid TTA granules or flakes in aqueous systems and enabling fast, accurate, and safe preparation of treatment solutions by simple dilution.
TT-50 has a lower odour than benzotriazole (BTA) and is specifically recommended for formulations requiring pH below 2 or above 10, where solid TTA or BTA may be less effective or less convenient to use; it is compatible with virtually all common water treatment chemicals — phosphonates, phosphates, molybdates, scale inhibitors, biocides, dispersants — and can be used synergistically with MBT and other azole and non-azole corrosion inhibitors for additive or synergistic corrosion protection packages.
Sodium tolyltriazole is listed on all major national and regional chemical inventories (EINECS, TSCA, NZIoC, PICCS, Vietnam NCI, China IECSC, KECL), confirming its regulatory status as an existing substance globally; it is effective at very low active concentrations (2–10 mg/L in cooling water; <1–6% in most applications), making it a cost-effective corrosion inhibitor across a wide range of industrial formulations.

Features of Sodium Tolyltriazole:
Sodium tolyltriazole (TT-50 liquid): pale yellow to amber clear liquid; active content ≥50% (w/w); density 1.186–1.210 g/cm³ (20°C); pH 11.0–12.0 (1% aqueous solution); completely miscible with water in all proportions; soluble in glycols, methanol, benzene, toluene; pKa 8.85 (20°C); water solubility of active component 664 g/L (20°C); vapour pressure 0.001 Pa (25°C); refractive index 1.55; molecular formula C₇H₆N₃Na; MW 155.13 g/mol.
Sodium tolyltriazole (TT-85 / solid grade): white to light yellow powder; active content ≥85%; melting point >80°C (decomposes); moisture ≤2.0%; pH 11–12 (1% solution); MW 155.13–155.14 g/mol; density 1.323 g/cm³; packaging: 25 kg or 50 kg woven bags with inner lining; dosing: dissolve in alcohol or alkali before addition to circulating water systems.
Sodium tolyltriazole functions by the same chemisorptive mechanism as neutral TTA — the tolyltriazolate anion adsorbs onto copper and copper alloy surfaces through N → Cu coordination bonds from the triazole ring nitrogen atoms, forming a multilayer Cu(I)–TTA coordination polymer passivation film that acts as a physical and electrochemical barrier against oxygen, water, chloride, and sulphide attack; the protective film formed by TTA·Na is uniform, thermally and oxidatively stable, and effective in both aqueous and vapour-phase environments; the film provides both mechanical protection and electrochemical protection by preventing galvanic coupling in multi-metal systems.

Chemical Properties of Sodium Tolyltriazole:
Sodium tolyltriazole has molecular formula C₇H₆N₃Na, MW 155.13 g/mol, CAS 64665-57-2, EC 265-004-9, EINECS 265-004-9, DTXSID4028125, UNII 27034S05ER; structural formula (C₇H₆N₃)Na; the compound is the sodium salt formed by deprotonation of the N-H of the tolyltriazole tautomeric mixture (4-methyl- and 5-methyl-1H-benzotriazole) with sodium hydroxide in aqueous solution.
Key chemical properties: highly water-soluble (664 g/L at 20°C); strongly alkaline (pH 11.0–12.0 in 1% solution); pKa of conjugate acid (TTA) 8.37 (literature for TTA) / pKa 8.85 (measured for TTA·Na system); density 1.186–1.210 g/cm³ (50% solution); vapour pressure 0.001 Pa (25°C); refractive index 1.55; miscible with water in all proportions, soluble in glycols and alcohols; compatible with most water treatment chemicals including phosphonates, molybdates, nitrates, silicates, borax, and sodium benzoate.
Sodium tolyltriazole is stable under normal storage conditions; incompatible with strong acids (protonation reverses the sodium salt to neutral TTA, precipitation risk at pH < ~6); incompatible with strong oxidising agents; corrosive to skin and eyes in concentrated solution (H314); harmful to aquatic organisms (H411); store in a cool, dry, shaded place in tightly sealed containers.

Production of Sodium Tolyltriazole:
Sodium tolyltriazole is produced by neutralisation of tolyltriazole (TTA — the commercial mixture of 4-methyl- and 5-methyl-1H-benzotriazole) with sodium hydroxide (NaOH) in aqueous solution: TTA + NaOH → TTA·Na + H₂O; the reaction is straightforward and quantitative; TT-50 is produced by dissolving TTA in aqueous NaOH to give a 50% (w/w) active solution at pH 11–12; TT-85 is produced by concentration and/or spray-drying of the TTA·Na solution.
Commercial sodium tolyltriazole is available as: TT-50 (50% aqueous solution, pale yellow to amber clear liquid; density 1.186–1.210 g/cm³; the standard commercial form preferred for most liquid formulation applications); TT-85 (≥85% solid, powder or flake); packaging: TT-50 in 250 kg plastic drums or 1,000 L IBC; TT-85 in 25 kg or 50 kg woven bags with inner lining; shelf life 12 months in original packaging; storage: cool, dry, dark place.

Sodium Tolyltriazole Material Safety Data Sheet (MSDS):

Handling of Sodium Tolyltriazole:
Sodium tolyltriazole (concentrated solution and solid) is corrosive — it causes severe skin burns and serious eye damage (H314); wear impervious chemical-resistant gloves (nitrile heavy-duty or neoprene), chemical splash goggles with solid side shields or full face shield, rubber apron or chemical-resistant protective clothing, and safety shoes for all handling operations; use safety shower and eye wash station; handle in a well-ventilated area; avoid contact with skin, eyes, and clothing.
Avoid breathing vapours, mists, or aerosols of the concentrated solution; do not eat, drink, or smoke in work areas; avoid release to the environment (H411 — harmful to aquatic organisms with long-lasting effects); TT-50 is not regulated as dangerous goods for transport (road, sea, or air) but TT-85 requires verification of applicable transport classification.

Sodium Tolyltriazole SDS:

Stability and Reactivity of Sodium Tolyltriazole:

Chemical stability:
Sodium tolyltriazole is stable under normal storage conditions.
Incompatible with strong acids (risk of neutralisation, precipitation of neutral TTA, and pH drop) and strong oxidising agents.

Reactivity:
Sodium tolyltriazole is a strongly alkaline salt (pH 11–12); it reacts with strong acids to regenerate neutral TTA; corrosive to skin and eyes in concentrated form.
Compatible with most water treatment chemicals; can be used synergistically with MBT, phosphonates, molybdates, silicates, nitrates, borax, and sodium benzoate.

Conditions to avoid:
Strong acids — neutralisation and possible precipitation of TTA.
Strong oxidising agents.
Temperatures above degradation point.

Incompatible materials:
Strong inorganic acids.
Strong oxidising agents.

Hazardous decomposition products:
Toxic nitrogen-containing fumes upon thermal decomposition.
CO and CO₂ upon combustion.

Handling and Storage of Sodium Tolyltriazole:

Handling:
Handle in a well-ventilated area; wear impervious gloves, chemical splash goggles or full face shield, and chemical-resistant protective clothing.
Avoid contact with skin, eyes, and clothing; avoid breathing vapours or aerosols.
Do not eat, drink, or smoke during handling; wash hands thoroughly after handling.

Storage:
Store in tightly closed containers in a cool, dry, shaded place, away from acids and oxidising agents.
Packaging: TT-50 in 250 kg plastic drums or 1,000 L IBC; TT-85 in 25 kg or 50 kg woven bags (inner lined).
Shelf life: 12 months in original packaging.

First Aid Measures for Sodium Tolyltriazole:

Inhalation: Move to fresh air; if breathing is difficult give oxygen; if respiratory irritation persists, consult a physician.
Skin contact: Immediately remove all contaminated clothing; wash off with soap and plenty of water; consult a physician — corrosive, causes severe skin burns.
Eye contact: Rinse with pure water for at least 15 minutes; remove contact lenses if present; seek immediate medical attention — causes serious eye damage.
Ingestion: Rinse mouth with water; do NOT induce vomiting; call a doctor or Poison Control Center immediately.

Firefighting Measures for Sodium Tolyltriazole:

Suitable extinguishing media: Dry chemical, CO₂, or alcohol-resistant foam.
Specific hazards: Aqueous solution (TT-50) is not flammable; solid (TT-85) is combustible; thermal decomposition produces toxic nitrogen-containing fumes; aqueous alkaline solution is corrosive.
Protective equipment for firefighters: SCBA and full protective clothing.

Accidental Release Measures for Sodium Tolyltriazole:

Personal precautions: Wear impervious gloves, face protection, and chemical-resistant clothing; avoid breathing mist or vapours; keep people away and upwind of spill.
Environmental precautions: Harmful to aquatic organisms with long-lasting effects (H411); do not allow entry into drains or watercourses; collect spillage and dispose per applicable regulations.
Clean-up: Collect and contain spilled material; remove to a suitable closed container for disposal; keep the chemical out of drains and the environment; dispose per applicable laws and regulations.

Exposure Controls / Personal Protective Equipment for Sodium Tolyltriazole:

Engineering controls: Adequate ventilation; local exhaust ventilation at transfer points; safety shower and eye wash station; emergency exits and risk-elimination areas.
Eye protection: Chemical splash goggles with unperforated side shields OR full face shield — when danger of splashing is high, both together.
Hand protection: Impervious chemical-resistant gloves (nitrile, neoprene, or butyl rubber; EN 374 tested).
Skin and body protection: Rubber apron or chemical-resistant protective clothing; chemical-resistant boots.
Respiratory protection: Full-face respirator with OV+P100 cartridge if exposure limits are exceeded or irritation is experienced.

Sodium Tolyltriazole Identifiers:
CAS Number: 64665-57-2
EC Number: 265-004-9
EINECS: 265-004-9
DTXSID: DTXSID4028125
UNII: 27034S05ER
HS Code: 29280090
Molecular Formula: C₇H₆N₃Na
Molecular Weight: 155.13 g/mol
Structural Formula: (C₇H₆N₃)Na
InChI: InChI=1/C7H6N3.Na/c1-5-3-2-4-6-7(5)9-10-8-6;/h2-4H,1H3;/q-1;+1
GHS Signal Word: Danger
GHS Hazards: H302 (harmful if swallowed); H314 (severe skin burns and eye damage); H411 (toxic to aquatic life with long lasting effects)
Skin corrosion: Sub-category 1B
Serious eye damage: Category 1
Acute oral toxicity: Category 4
Aquatic chronic: Category 2
Density (50% solution): 1.186–1.210 g/cm³ (20°C)
pH (1% solution): 11.0–12.0
pKa: 8.85 (20°C)
Water solubility: 664 g/L (20°C); completely miscible
Vapour pressure: 0.001 Pa (25°C)
Refractive index: 1.55
Biodegradability: Low

Properties of Sodium Tolyltriazole:
Physical state: Liquid (TT-50, 50% solution) or Powder/solid (TT-85, ≥85%)
Appearance (TT-50): Pale yellow to amber clear liquid
Appearance (TT-85): White to light yellow powder
Molecular formula: C₇H₆N₃Na
Molecular weight: 155.13 g/mol
Density (TT-50, 20°C): 1.186–1.210 g/cm³
Density (solid): 1.323 g/cm³
pH (1% solution): 11.0–12.0
pKa: 8.85 (20°C)
Water solubility: 664 g/L (20°C); fully miscible with water
Solubility: Glycols, methanol, benzene, toluene, alcohols
Vapour pressure: 0.001 Pa (25°C)
Refractive index: 1.55
Melting point (solid): >80°C (decomposes)
GHS: H302, H314, H411 — Danger
Biodegradability: Low
Storage: Cool, dry, dark; tightly closed

Sodium Tolyltriazole — Specifications:
Product name: Sodium Tolyltriazole (TT-50 / TT-85)
CAS Number: 64665-57-2
EC Number: 265-004-9
Molecular Formula: C₇H₆N₃Na
Molecular Weight: 155.13 g/mol
TT-50 Specification:
  Appearance: Amber transparent liquid
  Active content: ≥50.0% (w/w)
  Density (20°C): 1.186–1.210 g/cm³
  pH (1% solution): 11.0–12.0
TT-85 Specification:
  Appearance: White to light yellow powder
  Active content: ≥85%
  Moisture: ≤2.0%
  pH (1% solution): 11–12
Dosage (cooling water): 2–10 mg/L (normal); 5–10× for heavily corroded systems
Packaging: TT-50: 250 kg plastic drum; 1,000 L IBC — TT-85: 25 kg / 50 kg woven bags (inner lined)
Shelf life: 12 months (original packaging)
Storage: Cool, dry, shaded place; tightly closed
Documents: CoA, SDS available

Names of Sodium Tolyltriazole:
Sodium tolyltriazole
TTA·Na
TTAS
TTA-S
TT-50
TT-85
Tolyltriazole sodium salt
Tolytriazole sodium salt
Sodium 4(or 5)-methyl-1H-benzotriazolide
1H-Benzotriazole, 4(or 5)-methyl-, sodium salt
Sodium 4-tolyltriazole
1-H-Methylbenzotriazole sodium salt
Methylbenzotriazole sodium salt
Sodium salt of methylbenzotriazole
Tolytriazole 50% sodium salt solution (TTA50)
Tolytriazole 85% Na-salt (TTA85)
PMC Cobratec TT-85
Cobratec TT-50S
Cobratec TT-85
Preventol CI 750
COTT85
DTXSID4028125
UNII 27034S05ER
EINECS 265-004-9
CAS 64665-57-2