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Synonyms: 2-bromo-2-nitro-1,3-propanediol [IUPAC]; 2-nitro-2-bromo-1,3-propanediol, BNP; 2-bromo-2-nitropropane-1,3-diol; bronosol; onyxide 500; bronocot; bronidiol; myacide AS; 2-Bronopol
CAS No.: 52-51-71 EC No.: 200-143-0  RTECS No.: TY3385000
Molecular Weight:  199.99
Molecular Formula: C3H6BrNO4
Structural Formula: bronopol
M.p.: 130°C
B.p.: 140°C (decomposes)
V.p.: 1.68 mPa (20 °C)
Form: white crystals.
Henry: 1.34 × 10-6 Pa m3 mol-1 (calc.)
Solubility: In water 250 g/l (22 °C). In ethanol 500, isopropanol 250, propylene glycol 143, glycerol 10, liquid paraffin <5 (all in g/l, 23–24 °C). Readily soluble in acetone and ethyl acetate; slightly soluble in chloroform, diethyl ether, and benzene; insoluble in ligroin.
Stability: Slightly hygroscopic. Stable under normal storage conditions, but unstable in aluminium containers.




Bronopol is used in consumer products as an effective preservative agent, as well as a wide variety of industrial applications. Almost any industrial water system is a potential environment for bacterial growth, leading to slime and corrosion problems - in many of these systems Bronopol can be a highly effective bactericide, slimicide, odor controller and anti-fouling agent. Bronopol is also used as a substitute for formaldehyde in chemical toilets. Bronopol is also applied in cotton seed treatment.


Bronopol Content 99.0% min.
Loss on drying 0.50% max.
m.p. 126°C min.
Clarity and Color of Solution colorless and clear
pH Value (1% w/v) 5.0~7.0
Chloride 0.014% max.
Heavy Metals 10 ppm max.
Sulphate Ash 0.1% max.
Related Substance Complying with BP98
Appearance white crystalline powder

Standard Packaging

25kgs, 50kgs / fiber or plastic drum, 25kgs/paper bag

packaging for bronopol

Risks and Safety Information

Bronopol is regulated by UN as flammable solid.

UN 3241, Class: 4.1, PG III
R-Phrase: R21/22, R37/38, R41, R50
S-Phrase: S26, S37/39, S61
Oral Acute oral LD50 for rats 180–400. Skin and eye Acute percutaneous LD50 for rats >1600 mg/kg. Birds Acute oral LD50 for mallard ducks 510 mg/kg. Fish LC50 (96 h) for trout 20.0 mg/l.

Warning, Toxic!

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