Oxidizers & Peroxides
REACH
tert-butyl peroxybenzoate
CAS Number
614-45-9
EC Number
210-382-2
Abbreviation
TBPB
What is tert-butyl peroxybenzoate?
Tert-butyl peroxybenzoate (CAS 614-45-9), also known as TBPB or tert-butyl perbenzoate, is an organic peroxide used as a free-radical initiator and curing agent in polymer and coatings manufacturing.
Where is tert-butyl peroxybenzoate used?
- Rubber and tire production: cross-linking of elastomers, improving mechanical strength and heat resistance
- Unsaturated polyester resins and gel coats: cure initiator
- Coatings: radical polymerization in acrylic and styrenic systems
- Plastics processing: peroxide crosslinker for polyethylene
- It also serves as a grafting initiator for modifying polymer backbones.
Good to know: Its controlled decomposition temperature suits medium-temperature cure systems where processing window and final product performance must be balanced.
Commercial specifications
- 98% pure or diluted formulations for safer handling
- Drum and IBC quantities
Other Names (Synonyms)
TBPB|tert-Butyl perbenzoate|Chaloxyd tbpb|Perbutyl Z|Esperox 10|t-Butyl perbenzoate|Trigonox C|Benzoyl tert-butyl peroxide
What are the physical properties of tert-butyl peroxybenzoate?
Melting Point 8 °C
Boiling Point 75-76 °C @ Press: 0.2 Torr
Density 1.021 g/cm³ @ Temp: 25 °C
Flash Point 200 °F
Appearance colourless or slightly yellow liquid
Color Clear yellow
Odor mild aromatic odor
Form Liquid
Water Solubility Immiscible
Vapor Pressure 3.36 mm Hg ( 50 °C)
Refractive Index n 20/D 1.499(lit.)
Log P 3 at 25℃
How is tert-butyl peroxybenzoate classified and handled safely? Learn More
Danger
GHS02· Flammable GHS07· Irritant GHS09· Environmental Hazard GHS08· Health Hazard
Hazard Statements
H227 Combustible liquid
H242 Heating may cause a fire
H315 Causes skin irritation
H317 May cause an allergic skin reaction
Precautionary Statements
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P234 Keep only in original packaging.
P235 Keep cool.
P240 Ground and bond container and receiving equipment.
Which trade and regulatory codes apply to tert-butyl peroxybenzoate?
HS Code 29163900
UN Number 3103
ADR Class 5.2
Storage Class 4.1A - Other explosive hazardous materials
WGK (Germany) 2