Chemical Properties

Benzotriazole is a white to light yellow crystalline powder with a slight odor. Its key chemical properties include:

  • CAS Number: 95-14-7

  • Molecular Formula: C6H5N3

  • Molecular Weight: 119.12 g/mol

  • Melting Point: 98–100°C

  • Boiling Point: Approximately 350°C (decomposes)

  • Density: 1.36 g/cm³

  • Solubility: Moderately soluble in water (20 g/L at 20°C), highly soluble in ethanol, acetone, and benzene

  • Appearance: White to light yellow crystalline powder or flakes

Specifications :

Item Standard
Appearance Needle, granular, powder, flake
Purity(%) 99.5MIN
Melting point(°C) 96-99
Water(%) 0.1MAX
Ash(%) 0.05MAX
PH 5.3-6.3
Soluble in alcohol Clear and transparent without impurities

Applications

Industrial Coolants and Antifreeze

  • Automotive and Heavy-Duty Coolants: Dosed at 0.1-0.3% to protect brass radiators and copper heat exchangers from cavitation and galvanic corrosion.
  • Aircraft De-Icing Fluids: 0.05-0.2% for yellow metal components in ground support equipment.

Metalworking Fluids

  • Cutting and Grinding Oils: 0.2-0.5% as a copper-specific inhibitor in water-miscible emulsions, preventing tool wear.
  • Hydraulic Fluids: Synergistic with tolyltriazole at 0.1% for multi-metal protection in machinery.

Water Treatment

  • Closed-Loop Systems: 5-15 ppm to chelate dissolved copper and inhibit microbiologically induced corrosion in cooling towers.

Why Choose Our BTA?

Our Benzotriazole is recrystallized for color <50 APHA and water insolubles <0.01%, ensuring robust film formation and no turbidity in blends. Coolant developers achieve 30% longer protection cycles and 20% reduced pitting in accelerated tests. Available in powder and granular forms for industrial/technical grades, packaged in 25kg drums or 200kg bags, with REACH and TSCA compliance for dependable supply.

Frequently Asked Questions (FAQs)

What is Benzotriazole (BTA)?

Benzotriazole (BTA) is a triazole corrosion inhibitor with formula C₆H₅N₃ and CAS 95-14-7, used for copper alloys. It’s a crystalline powder that adsorbs on metal surfaces to form protective films in coolants and fluids.

How is BTA applied in coolants?

Dissolve 0.1-0.25% in ethylene glycol-water mixtures during blending; it activates at pH 8-10 to prevent copper dissolution in recirculating systems.

Is BTA environmentally safe?

Yes, BTA biodegrades >70% in 28 days per OECD 301D, with low bioaccumulation and EC50 >100 mg/L, suitable for green-labeled formulations.

What is the shelf life of BTA?

In sealed, dry containers below 30°C, BTA maintains stability for 2-3 years, with no volatility or purity loss.

Can BTA be combined with other azoles?

BTA pairs synergistically with tolyltriazole at 1:1 ratios for broader metal protection but avoid high chlorides to prevent displacement.

Does BTA influence fluid pH?

BTA’s neutral profile has negligible effect, but it stabilizes pH in alkaline coolants by buffering metal ions.

What packaging options are available for BTA?

We offer 25kg fiber drums, 50kg plastic bags, and 200kg supersacks, all moisture-barrier lined for dust-free handling.

For corrosion testing, formulation advice, or bulk procurement, our inhibition specialists are ready to assist.

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