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Benzotriazole (BTA)


Synonyms: 1H-Benzotriazole; 1,2,3-Benzotriazole; BTA
CAS No.: 95-14-7 EC No.:
Molecular Weight: 119.13
Molecular Formula: C6H5N3
Structural Formula:Benzotriazole
m.p.: 96~97°C
b.p. (15mm): 201~204°C
f.p.: 195°C


Benzotriazole is industrially manufactured by the diazotization reaction of o-phenylenediamine, sodium nitrite and acetic acid, decribed as following: synthesis of benzotriazole


Benzotriazole (BTA) is applied as anti-rusting agent or corrosion inhibitor for metal (mainly copper and its alloys) by forming a passive layer, consisting of a complex between copper and benzotriazole, when copper is immersed in a solution containing benzotriazole. The passive layer is insoluble in aqueous and many organic solutions. ,Also used as anti-freezing agent for car, synthetic detergent, anti-dust agent for photography and polymer stabilizer.


Items Specification
Benzotriazole Content 99.5% min.
Moisture 0.05% max.
m.p. 97~98°C min.
Clarity and Color in alcohol transparent and no deposition
pH Value 5.5~6.0
Chroma 40 max.
Ash 0.03% max.
Appearance white crystalline powder, or flake, or needle

Standard Packaging

Needle grade: 20 kgs net/woven bag, 16mt/40' container

Sample of benzotriazole

Risks and Safety Information

Benzotriazole (BTA) is regulated by UN as Toxic Solid, Organic. N.O.S. Hazard Class 6.1; UN 2811; PG III
Harmful by inhalation and if swallowed; wear suitable protective clothing, gloves; in case of insufficient ventilation, wear suitable respiratory equipment.
For more information, please see MSDS

Warning, Toxic!

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