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Oxidizers & Peroxides

Benzoyl peroxide

CAS: 94-36-0

Overview

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.

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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 GHS02 GHS07 GHS09 GHS03 Hazard Statements H241 Heating may cause a fire or explosion H242 Heating may cause a fire H316 Causes mild skin irritation H317 May cause an allergic skin reaction H319 Causes serious eye irritation H335 May cause respiratory irritation H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects Precautionary Statements P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking. P234 Keep only in original packaging. P235 Keep cool. P240 Ground and bond container and receiving equipment. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P378 Use … for extinction. P391 Collect spillage. P403 Store in a well-ventilated place. P405 Store locked up. P410 Protect from sunlight. P411 Store at temperatures not exceeding … °C/…°F. P420 Store away from other materials. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P370+P378 Use … for extinction. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P370+P380+P375 Evacuate area.

Trade & Regulatory

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

Other Names

Diphenylglyoxal peroxide | Bepio | Benzoyl superoxide | Benzoyl benzenecarboperoxoate | BPO | Dibenzoyl peroxide | Peroxidedibenzoyl | Lucidol | E928

Related Products

Chemical Properties

CAS Number
94-36-0
EC Number
202-327-6
Mol. Weight
242.23
HS Code
29163200

Industries

Documentation