Acetyl benzoyl peroxide (CAS 644-31-5)
Acetyl benzoyl peroxide (CAS 644-31-5) is an organic peroxide compound with molecular formula C9H8O4 and molecular weight 180.16. Also known as Acetyl benzoyl peroxide, Benzoyl acetyl peroxide, Acetylbenzoyl peroxide. It typically appears in crystalline solid/powder form.
It is commonly used as a crosslinking agent or polymerization initiator in polymer processing.
Below you can find its complete physical and chemical properties, safety data, GHS hazard classifications, and a catalog of 0 products.
CAS 644-31-5 is also known as:
- Acetyl benzoyl peroxide
- Benzoyl acetyl peroxide
- Acetylbenzoyl peroxide
- Peroxide, acetyl benzoyl
- Acetozone
- Benzozone
- Acetic benzoic peroxyanhydride
- Acetyl benzenecarboperoxoate
CAS Number
644-31-5
Molecular Formula
C9H8O4
Molecular Weight
180.16
EINECS Number
211-412-7
MDL Number
MFCD01742572
BRN Number
1948833
Chemical Name
Acetyl benzoyl peroxide
Last Updated
6/1/2026
Aliases
Appearance
White needles or crystalline powder
Appearance State
Solid. Insoluble in water, soluble in most organic solvents.
Color
White
Odor
Pungent odor
Form
Crystalline Solid/Powder
Melting Point
36-37
Boiling Point
130 °C @ 19 mmHg (Highly thermal sensitive and explosive, reduced pressure boiling point. QSPR predicted normal pressure boiling point 278.4 °C has no safety guiding significance)
Flash Point
122.3 (predicted)
Density
1.234 (predicted)
Vapor Density
6.2 (air=1)
Vapor Pressure
0.134 Pa @ 25°C
Refractive Index
1.523 (predicted)
LogP Value
1.87 (predicted)
Merck Index
14, 82
Solubility
Insoluble in water, soluble in ether, chloroform, benzene, and volatile oils
Water Solubility
639 mg/L @ 25 °C (Literature measured. Slow hydrolysis/decomposition occurs upon contact with water, data discrepancies exist across literature and QSAR software)
Solubility Detail
Slightly soluble in water, readily soluble in most organic solvents. Due to its high thermal sensitivity, commercial products are mainly distributed as phlegmatized solutions or mixtures below 40% concentration.
Storage Conditions
Store under strict temperature control (refrigerated or frozen, preferably below 0°C), protect from light, shock, and impact. Keep in an explosion-proof flammable danger storage area.
InChI Key
SWAXTRYEYUTSAP-UHFFFAOYSA-N
GHS Hazard Symbols
Hazard Class
Signal Word
Danger
Hazard Symbols
E, Xi
Risk Codes
R2, R7, R36/37/38
UN Number
UN 3105 / UN 3115 (Depending on the actual commercially available phlegmatized formulation and form)
IARC Classification
Not Classified
WGK Germany
2
RTECS Number
SD7875000
Auto-ignition Temperature
ca. 80 (self-accel. dec.)
TSCA Listed
Not Listed
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
Hazard Statements
H241, H315, H319, H335Precautionary Statements
P210, P220, P234, P240, P280, P370+P378, P370+P380+P375, P403+P235, P411, P420, P501Safety Statements
S3/7, S14, S16, S26, S36/37/39, S45
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