5-Chloro-2-methyl-4-isothiazolin-3-one
Also known as: 5-Chloro-2-methyl-3(2H)-isothiazolone, 5-Chloro-2-methyl-2H-isothiazol-3-one, 5-Chloro-2-methylisothiazol-3(2H)-one, Methylchloroisothiazolinone, Chloromethylisothiazolinone, MCI, CMIT
5-Chloro-2-methyl-4-isothiazolin-3-one (CAS 26172-55-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H4ClNOS and a molecular weight of 149.599 g/mol. Key properties include a melting point of 42-45?C, a boiling point of 200.2±50.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 74.9±30.1 °C. It is listed by 1 supplier, from 160.00 to 160.00 CNY per 25mg. Record last updated Aug 21, 2026.
- CAS No.
- 26172-55-4
- Jingsj CID
- J-1361849-2
- Molecular Formula
- C4H4ClNOS
- Molecular Weight
- 149.599 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
In Stock | 2.50% 25mg | ¥4,000.00 | $23.94 /mgBest ¥160.00/mg CNY | CN China MOQ 25mg |
Physicochemical Properties
| Melting Point | 42-45?C |
|---|---|
| Boiling Point | 200.2±50.0 °C at 760 mmHg |
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 74.9±30.1 °C |
| Exact Mass | 148.970215 |
| PSA | 50.24000 |
| LogP | 0.24 |
| Vapor Pressure | 0.3±0.4 mmHg at 25°C |
| Refractive Index | 1.628 |
Customs & Trade Information
| HS Code | 2934999090 |
|---|---|
| Summary | 2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of 5-Chloro-2-methyl-4-isothiazolin-3-one?
The CAS number of 5-Chloro-2-methyl-4-isothiazolin-3-one is 26172-55-4.
What are the molecular formula and molecular weight of 5-Chloro-2-methyl-4-isothiazolin-3-one?
5-Chloro-2-methyl-4-isothiazolin-3-one has molecular formula C4H4ClNOS and molecular weight 149.599 g/mol.
Which suppliers offer 5-Chloro-2-methyl-4-isothiazolin-3-one?
1 supplier(s) listed; reference unit price ¥160.00–160.00 /mg.
What are the upstream and downstream products of 5-Chloro-2-methyl-4-isothiazolin-3-one?
For 5-Chloro-2-methyl-4-isothiazolin-3-one, Upstream Products: N,N'-Dimethyl-3,3'-dithiodipropionamide, 1,2-dichloroethane, Isothiazol-3(2H)-one.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "5-Chloro-2-methyl-4-isothiazolin-3-one (CAS 26172-55-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1361849-2 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.