Molekula
1,2-Benzisothiazol-3(2H)-one
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
1,2-Benzisothiazol-3(2H)-one, also called BIT, is a broad-spectrum biocide widely used in water treatment systems, industrial cooling circuits, and as an in-can preservative in paints, adhesives, and other water-based products to prevent microbial growth. It is effective against bacteria, algae, and fungi at low concentrations. This chemical has a CAS number of 2634-33-5, a molecular formula of C7H5NOS, and a molecular weight of 151.19 g/mol. It is stored at ambient conditions and carries a "Danger" signal word due to its hazardous nature. Molekula supplies 1,2-Benzisothiazol-3(2H)-one from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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5 g — £30.90 per pack ex VAT · £37.08 inc. VAT
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Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
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Specifications
| Property | Value |
|---|---|
| Appearance | White to yellow powder |
| Melting Point | 148 - 158 °C |
| HPLC | ≥99% |
| Identification (IR) | Conforms to Reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | II |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Off-white to yellowish solid |
| Melting Point | 156.6 °C |
| Boiling Point | 327.6 °C |
| Density | 1.483 g/cm³ at 20 °C |
| Vapour Pressure | 2.78 × 10⁻⁶ mmHg at 25 °C |
| log P (octanol/water) | 0.76 |
Source: PubChem CID 17520 (HSDB)
Identification
| Property | Value |
|---|---|
| SKU | 90027172 |
| CAS Number | 2634-33-5 |
| IUPAC Name | 1,2-benzothiazol-3-one |
| EC Number | 220-120-9 |
| Molecular Formula | C7H5NOS |
| Molecular Weight | 151.19 |
| Exact Mass | 151.0092 |
| SMILES | C1=CC=C2C(=C1)C(=O)NS2 |
| InChIKey | DMSMPAJRVJJAGA-UHFFFAOYSA-N |
| InChI | InChI=1S/C7H5NOS/c9-7-5-3-1-2-4-6(5)10-8-7/h1-4H,(H,8,9) |
| PubChem CID | 17520 |
| UN Number | UN2811 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29342080 |
| Tariff Code | 2934208025 |
Safety & GHS
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Corrosive
GHS05
-
Toxic
GHS06
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Health Hazard
GHS07
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Hazardous to the Environment
GHS09
Hazard statements
- H302 Harmful if swallowed
- H317 May cause an allergic skin reaction
- H318 Causes serious eye damage
- H330 Fatal if inhaled
- H400 Very toxic to aquatic life
- H410 Very toxic to aquatic life with long lasting effects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, English (US), French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 1,2-Benzisothiazolin-3-one
- 1,2-Benzisothiazoline-3-one
- 1,2-Benzoisothiazol-3-one
- 2,3-dihydro-1,2-benzothiazol-3-one
- 3-Hydroxy-1,2-benzisothiazole
- Benzisothiazolin-3-one
- benzisothiazolinone
- benzisothiazolone
- benzoisothiazol-3-one
- Proxel PL
Frequently asked questions
What is 1,2-Benzisothiazol-3(2H)-one (BIT) commonly used for?
BIT is primarily used as a broad-spectrum biocide in water treatment systems, industrial cooling towers, and as a preservative in paints, coatings, and adhesives to prevent microbial contamination.
What is the chemical formula and molecular weight of BIT?
The chemical formula is **C7H5NOS**, and the molecular weight is **151.19 g/mol**.
How should 1,2-Benzisothiazol-3(2H)-one be stored?
Store at **ambient temperature** in a cool, dry place, away from incompatible substances like strong oxidizers. Keep containers tightly sealed.
What grades or purity levels of BIT does Molekula supply?
Molekula supplies **technical-grade BIT** (typically ≥98% purity) for industrial applications. Custom purities may be available upon request.
Can Molekula supply 1,2-Benzisothiazol-3(2H)-one in bulk quantities?
Yes, we offer **bulk packaging options** (e.g., 25 kg drums, 1 MT IBCs) for large-scale industrial customers. Minimum order quantities apply.
What documentation is provided with a BIT order from Molekula?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and a **Certificate of Conformity** for regulatory compliance. Additional documentation (e.g., batch-specific reports) is available upon request.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.