Oxidizers & Peroxides
REACH
2,5-dimethyl-2,5-di(tert-butylperoxy)hexane
CAS Number
78-63-7
EC Number
201-128-1
What is 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane?
2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane (CAS 78-63-7) is a high-temperature organic peroxide used as a free-radical initiator and cross-linking agent in polymer processing.
Where is 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane used?
- Rubber compounding: cross-links EPDM, silicone and natural rubber for heat resistance and compression set in seals, gaskets and automotive components
- Polyolefins: initiates cross-linking in PE and PP for wire and cable insulation, pipes and foam products
- Specialty resins and thermoplastic elastomers: polymerization initiator for molecular weight control
- Tire industry: sulfur-free cure systems with low extractables and improved aging
- At elevated cure temperatures it decomposes in a controlled way.
Good to know: Thermal stability at moderate storage temperatures suits controlled decomposition at elevated cure temperatures.
Commercial specifications
- 90% active content liquid
- Diluted grades as paste or powder blend on inert carrier
- Purity and active oxygen content confirmed by certificate of analysis per batch
Other Names (Synonyms)
Varox|Perhexa 3M40|Trigonox 101-101/45|Peroxide, 1,1′-(1,1,4,4-tetramethyl-1,4-butanediyl)bis[2-(1,1-dimethylethyl)|Peroxide, (1,1,4,4-tetramethyltetramethylene)bis[tert-butyl|Peroxide, (1,1,4,4-tetramethyl-1,4-butanediyl)bis[(1,1-dimethylethyl)
What are the physical properties of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane?
Melting Point 80 °C
Boiling Point 42 °C @ Press: 0.06 Torr
Density 0.8728 g/cm³ @ Temp: 28 °C
Flash Point 149 °F
Appearance colourless to light yellow liquid
Color Colourless
Form Oil
Water Solubility immiscible
Vapor Pressure 0.002Pa at 20℃
Refractive Index n 20/D 1.423(lit.)
Log P 7.34 at 20℃
How is 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane classified and handled safely? Learn More
Danger
GHS02· Flammable GHS07· Irritant
Hazard Statements
H226 Flammable liquid and vapor
H227 Combustible liquid
H242 Heating may cause a fire
H315 Causes skin irritation
H319 Causes serious eye irritation
H413 May cause long lasting harmful effects to aquatic life
Precautionary Statements
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233 Keep container tightly closed.
P234 Keep only in original packaging.
P235 Keep cool.
Which trade and regulatory codes apply to 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane?
HS Code 29012990
UN Number 3108
ADR Class 5.2
WGK (Germany) 1