Benzotriazole BT
CAS Number
70321-86-7
EC Number
274-570-6
What is Benzotriazole BT?
Benzotriazole BT (CAS 70321-86-7) is a high-performance UV absorber used to protect polymer systems and coatings from photodegradation. Also marketed as Tinuvin 234.
Where is Benzotriazole BT used?
- Industrial and automotive coatings: prevents yellowing and gloss loss in clear coats and pigmented topcoats
- Plastics: incorporated into polycarbonate, PET, and engineering thermoplastics where long-term transparency is critical
- Adhesives and sealants: extends service life in construction and transportation assemblies subject to UV exposure
- Printing and packaging: protects UV-curable inks and laminate films from fading
- It intercepts UV radiation before it can initiate chain scission.
Commercial specifications
- Purity specifications typically at 98% or higher
- Packaging options generally range from kilogram-scale bags to bulk quantities suited for large-volume compounding operations
Other Names (Synonyms)
Phenolic benzotriazole|2-(benzotriazol-2-yl)-4,6-bis(2-phenylpropan-2-yl)phenol|2-(2h-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol
What are the physical properties of Benzotriazole BT?
Melting Point 139-143 °C(lit.)
Boiling Point 589.3±60.0 °C(Predicted)
Density 1.12±0.1 g/cm3(Predicted)
Flash Point 383 °F(lit.)
Color White to Off-White
Odor fresh fruity raspberry rose
Form powder
Water Solubility insoluble, <0.04 ppm at 20 ºC
How is Benzotriazole BT classified and handled safely? Learn More
Warning
GHS07· Irritant
Hazard Statements
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation
H412 Harmful to aquatic life with long lasting effects
H413 May cause long lasting harmful effects to aquatic life
Precautionary Statements
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P271 Use only outdoors or in a well-ventilated area.
P273 Avoid release to the environment.
Which trade and regulatory codes apply to Benzotriazole BT?
HS Code 29339900
Storage Class 11 - Combustible Solids