Molecule structure of 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane (CAS NO.78-63-7):
  
IUPAC Name: 2,5-Bis(tert-butylperoxy)-2,5-dimethylhexane 
Molecular Weight: 290.43876 g/mol
Molecular Formula: C₁₆H₃₄O₄ 
Density: 0.912 g/cm³ 
Melting Point: 6 °C
Boiling Point: 306.5 °C at 760 mmHg 
Flash Point: 106.1 °C
Index of Refraction: 1.434
Molar Refractivity: 83.01 cm³
Molar Volume: 318.2 cm³
Polarizability: 32.91×10^-24 cm³
Surface Tension: 27.3 dyne/cm 
Enthalpy of Vaporization: 52.52 kJ/mol
Vapour Pressure: 0.00139 mmHg at 25 °C 
Storage Temp.: indoors 
Water Solubility: immiscible
XLogP3-AA: 3.9
H-Bond Acceptor: 4
Rotatable Bond Count: 9
Exact Mass: 290.24571
MonoIsotopic Mass: 290.24571
Topological Polar Surface Area: 36.9
Heavy Atom Count: 20
Complexity: 252
Canonical SMILES: CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C
InChI: InChI=1S/C16H34O4/c1-13(2,3)17-19-15(7,8)11-12-16(9,10)20-18-14(4,5)6/h11-12H2,1-10H3
InChIKey: DMWVYCCGCQPJEA-UHFFFAOYSA-N
EINECS: 201-128-1
Product Categories: Organics

 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane (CAS NO.78-63-7) is used as the initiator, and polymer degradation agent, silicone rubber, polyurethane rubber, ethylene propylene rubber and other rubber vulcanization agent.

Reported in EPA TSCA Inventory.

Hazard Codes: O, Xn, Xi
Risk Statements: 8-36/37/38-7-36/38-10-41-37/38 
R8 :Contact with combustible material may cause fire. 
R36/37/38:Irritating to eyes, respiratory system and skin. 
R7:May cause fire. 
R36/38:Irritating to eyes and skin. 
R10:Flammable. 
R41:Risk of serious damage to the eyes. 
R37/38:Irritating to respiratory system and skin.
Safety Statements: 7-17-36/37/39-3/7-26-14A-47-14 
S7:Keep container tightly closed. 
S17:Keep away from combustible material. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S14:Keep away from ... (a list of incompatible materials will follow). 
S47:Keep at temperature not exceeding...
RIDADR: UN 3108 5.2
WGK Germany: 1
RTECS: MO1835000
HazardClass: 5.2
PackingGroup: II
Moderately toxic by intraperitoneal route. Combustible when exposed to heat, flames, or reducing agents. To fight fire, use water spray, foam, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes. Used in the polymerization of styrene and in cross-linking of various grades of polyethylene. See also PEROXIDES, ORGANIC.

 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane (CAS NO.78-63-7) is also named as 1,4,4-Tetramethyltetramethylene)bis(tert-butyl peroxide) ; 5-Bis(tert-butyldioxy)-2,5-dimethylhexane ; 2,5-Dimethyl-2,5-bis(tert-butyldioxy)hexane ; 2,5-Dimethyl-2,5-di(t-butylperoxy)hexane ; 2,5-Dimethyl-2,5-di-(tert-butylperoxy)hexane ; AD ; AD 40C ; BRN 1863369 ; CCRIS 4626 ; CR 05 ; CT 8 (crosslinking agent) ; HC 4 (peroxide) ; Hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)- ; Interox ; DHBP ; Interox DHBP 45IC/G ; Kayahexa AD ; Kayahexa AD 40 ; Kayahexa AD 40C ; Luperco 101X45 ; Peroxide, (1,1,4,4-tetramethyl-1,4-butanediyl)bis((1,1-dimethylethyl) ; Trigonox 101 ; Trigonox 101-101/45 ; Trigonox XQ 8 ; Triqanox XQ 8 ; Varox ; Varox 50 ; Varox DBPH 50 ; Varox Liquid . 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane (CAS NO.78-63-7) is colourless to light yellow liquid and insoluble in water. 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane (CAS NO.78-63-7) is unstable and may contain an inhibitor. It is incompatible with strong oxidizing agents, acids, reducing agents, organic materials, powdered metals. Peroxides, such as 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane (CAS NO.78-63-7), are good oxidizing agents. Strongly reduced material such as sulfides, nitrides, and hydrides may react explosively with peroxides. There are few chemical classes that do not at least produce heat when mixed with peroxides. Many produce explosions or generate gases (toxic and nontoxic). Generally, dilute solutions of peroxides (<70%) are safe, but the presence of a catalyst (often a transition metal such as cobalt, iron, manganese, nickel, or vanadium) as an impurity may even then cause rapid decomposition, a buildup of heat, and even an explosion. Solutions of peroxides often become explosive when evaporated to dryness or near-dryness. Danger of explosion when dry. It may explode from heat, shock, friction or contamination. It may ignite combustibles (wood, paper, oil, clothing, etc.) and may be ignited by heat, sparks or flames.