Molekula
N-Methyl-3-oxodihydroisothiazole (W/W 10% aqueous solution)
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
N-Methyl-3-oxodihydroisothiazole (W/W 10% aqueous solution) is a heterocyclic compound used as a biocide and preservative in industrial applications. It is typically used to preserve paints, adhesives, metalworking fluids, paper coatings and personal care products, and to control microbial growth in cooling towers and pulp mills. It is a clear, yellowish liquid with a distinct odor. CAS: 2682-20-4, Molecular Formula: C4H5NOS, Molecular Weight: 115.15 g/mol. Stored at ambient temperature. Hazard classification: Danger. Molekula supplies N-Methyl-3-oxodihydroisothiazole (W/W 10% aqueous solution) 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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25 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.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Clear to Light yellow liquid |
| Identification | Conforms to reference |
| pH | 3.0 - 7.0 |
| Specific Gravity | 1.01 - 1.04 |
| Active Ingredient | ≥10% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 (6.1) |
| Packing Group | II |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 74130881 |
| CAS Number | 2682-20-4 |
| IUPAC Name | 2-methyl-1,2-thiazol-3-one |
| EC Number | 220-239-6 |
| Molecular Formula | C4H5NOS |
| Molecular Weight | 115.15 |
| Exact Mass | 115.0092 |
| SMILES | CN1C(=O)C=CS1 |
| InChIKey | BEGLCMHJXHIJLR-UHFFFAOYSA-N |
| InChI | InChI=1S/C4H5NOS/c1-5-4(6)2-3-7-5/h2-3H,1H3 |
| PubChem CID | 39800 |
| UN Number | UN2922 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29341020 |
| Tariff Code | 2934100090 |
Safety & GHS
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Corrosive
GHS05
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Toxic
GHS06
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Hazardous to the Environment
GHS09
Hazard statements
- EUH071 Corrosive to the respiratory tract
- H301 + H311 Toxic if swallowed or in contact with skin
- H314 (sub cat. 1B) Causes severe skin burns and eye damage
- H317 May cause an allergic skin reaction
- 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
- P284 Wear respiratory protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- 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, French, German, Italian, 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
- 2-methyl-1,2-thiazol-3(2H)-one
- 2-methyl-3-isothiazolone
- 2-Methyl-3(2H)-isothiazolone
- 2-Methyl-4-isothiazolin-3-one
- 2-Methyl-4-isothiazoline-3-one
- 3(2H)-Isothiazolone, 2-methyl-
- Methylisothiazolinone
- n-methylisothiazolin-3-one
- N-methylisothiazolone
- Neolone 950
Frequently asked questions
What is N-Methyl-3-oxodihydroisothiazole used for?
It is primarily used as a biocide in industrial water systems, coatings, and adhesives to prevent microbial growth.
What is the chemical formula and molecular weight?
The formula is C4H5NOS with a molecular weight of 115.15 g/mol.
How should this product be stored?
Store at ambient temperature, away from direct sunlight and incompatible materials.
What grade is available?
Available as a W/W 10% aqueous solution; no other grades are currently offered.
Can Molekula supply this in bulk?
Yes, bulk quantities are available upon request; please contact our sales team for pricing and lead times.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
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.