2,5-Dimethyl-2,5-di-(benzoylperoxy)hexane (CAS 2618-77-1)

CAS Number

2618-77-1

Molecular Formula

C22H26O6

Molecular Weight

386.44

EINECS Number

220-050-9

MDL Number

MFCD00143110

BRN Number

1361381

Last Updated

6/1/2026

Appearance

White to pale yellow needle-like crystalline solid or powder, commercially available as technically pure or masterbatch mixed with inert solid (e.g., 40% formulation)

Appearance State

Solid. Insoluble in water, readily soluble in acetone, ethanol, cyclohexanone, and ethyl acetate; insoluble in benzene and kerosene.

Color

White to Light Yellow

Odor

Slight, characteristic ester-like or slightly pungent odor

Form

Crystalline Solid/Powder

Melting Point

114-115 °C (decomp)

Boiling Point

529.9 °C @ 760 mmHg (Predicted. Prone to violent self-accelerating thermal decomposition and explosion, normal pressure boiling point has no safety guiding significance)

Flash Point

229.5 °C (predicted)

Density

1.143 g/cm³ (predicted)

Vapor Density

13.3 (air=1)

Vapor Pressure

2.59E-11 mmHg @ 25°C

Refractive Index

1.534 (predicted)

LogP Value

5.33 (predicted)

Merck Index

Not Specified

Solubility

Insoluble in water, soluble in acetone, anhydrous ethanol, cyclohexanone, and ethyl acetate

Water Solubility

Insoluble (approx. 0.12 mg/L @ 25 °C predicted) (Highly hydrophobic aromatic skeleton, extremely low solubility, keep dry to prevent hydrolysis and decomposition)

Solubility Detail

Insoluble in water. Due to the high mechanical (shock/friction) and thermal sensitivity of the pure dried crystals, it is widely distributed or phlegmatized with inert solids (typically as 40% granules or powders) to ensure safe industrial radical initiation and compounding.

Storage Conditions

Must be stored in strict compliance with organic peroxide warehouse safety regulations. Recommended storage temperature below 30°C (depending on formulation SADT). Keep far away from heat, sparks, open flames, and direct sunlight. The dedicated facility must be isolated and explosion-proof, featuring proper hazard ventilation and pressure relief systems. Avoid friction, violent impact, and mechanical shock. Keep strictly separated from strong acids, strong bases, reducing agents, combustibles, and heavy metal compounds.

InChI Key

RIPYNJLMMFGZSX-UHFFFAOYSA-N

Signal Word

Danger

Hazard Symbols

E, O, Xi

Risk Codes

R2, R7, R36/37/38

UN Number

UN 3102 (Organic peroxide, Type B, solid)

IARC Classification

Not Classified

WGK Germany

2

RTECS Number

Not Specified

Auto-ignition Temperature

ca. 60-65 °C (自加速分解温度 SADT，取决于具体商业配方的活性成分纯度)

TSCA Listed

Listed (Active)

Packing Group

II

Customs Code

2916399090

Occupational Exposure Band (OEB)

Not Specified

Occupational Exposure Limit (OEL)

Not Specified

Immediately Dangerous to Life or Health (IDLH)

Not Specified