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Benzoyl peroxide

CAS Number
94-36-0
EC Number
202-327-6
Chemical Formula
C14H10O4
Molecular Weight
242.23 g/mol

Description

Benzoyl peroxide (CAS 94-36-0 ), also known as BPO and approved as E928 in food applications, is an organic peroxide used across industries as a free-radical initiator, bleaching agent, and curing catalyst. Its ability to generate reactive radicals on decomposition makes it a core processing chemical in polymer manufacturing, food treatment, and topical pharmaceutical formulations. In plastics and rubber, BPO initiates free-radical polymerization. It facilitates the cross-linking of resins, silicones, and elastomers, directly influencing cure speed and final material properties. Food producers use it as a flour bleaching agent to accelerate the natural whitening of wheat flour. This process improves dough handling characteristics. In pharmaceutical manufacturing, it is the active ingredient in topical acne treatment formulations, where its antimicrobial oxidizing action targets acne-causing bacteria. Personal care formulators also incorporate BPO into medicated creams and gels at controlled concentrations for the same antimicrobial function. Benzoyl peroxide is supplied as a white powder or granules. It is typically wetted or diluted with water or plasticizers to reduce explosion risk during handling and transport. Standard commercial grades include 70–75% active content (water-wetted) and 50% dispersions. Pharmaceutical-grade material is available to USP and Ph.Eur. specifications for use in regulated drug product manufacturing. These standards ensure the highest purity for sensitive medical applications. Contact us for supply of Benzoyl peroxide Request Quote

Other Names (Synonyms)

Diphenylglyoxal peroxide | Bepio | Benzoyl superoxide | Benzoyl benzenecarboperoxoate | BPO | Dibenzoyl peroxide | Peroxide, dibenzoyl | Lucidol | E928

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point103-106 °C
Boiling Point176°F
Density1.334 g/cm³ @ Temp: 25 °C
Flash Point>230 °F
AppearanceBenzoyl peroxide is an odorless, white or colorless crystalline powder.
ColorWhite
Odorodorless
Formpowder
Water SolubilityInsoluble
Vapor Pressure0.009Pa at 25℃
Refractive Index1.5430 (estimate)
Log P3.2 at 20℃

Safety & Handling

Danger
GHS01· ExplosiveGHS02· FlammableGHS07· IrritantGHS09· EnvironmentGHS03· Oxidizer

Hazard Statements

H241Heating may cause a fire or explosion
H242Heating may cause a fire
H316Causes mild skin irritation
H317May cause an allergic skin reaction
H319Causes serious eye irritation
H335May cause respiratory irritation
H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects

Precautionary Statements

P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P234Keep only in original packaging.
P235Keep cool.
P240Ground and bond container and receiving equipment.
P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P271Use only outdoors or in a well-ventilated area.
P272Contaminated work clothing should not be allowed out of the workplace.
P273Avoid release to the environment.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P319Get medical advice/attention if you feel unwell.
P321Specific treatment (see … on this label).
P378Use … for extinction.
P391Collect spillage.
P403Store in a well-ventilated place.
P405Store locked up.
P410Protect from sunlight.
P411Store at temperatures not exceeding … °C/…°F.
P420Store away from other materials.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P317Get emergency medical help.
P317Get emergency medical help.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P364Take off contaminated clothing and wash it before reuse.
P378Use … for extinction.
P233Store in a well-ventilated place. Keep container tightly closed.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P375Evacuate area.

Trade & Regulatory

HS Code29163200
UN Number3108
ADR Class5.2
WGK (Germany)2