Choosing Isothiazolinones (CMIT/MIT): Application Fit and Specification Checks

1. Confirm the chemical identity

According to the product description, Isothiazolinones (CMIT/MIT) contains two parts:

• 5-chloro-2-methyl-4-isothiazolin-3-one (CMI), CAS No. 26172-55-4
• 2-methyl-4-isothiazolin-3-one (MI), CAS No. 2682-20-4

The listed molecular weight is 115.16. Listed synonyms include 3(2H)-Isothiazolone, 5-chloro-2-methyl and 2-Methyl-3(2H)-Isothiazolone. Put both CAS numbers on purchase documents and in internal approval records so the right material is quoted.

2. Check that your application is a fit

The product description lists these uses:

• Industrial circulating cooling water systems
• Wastewater treatment in oilfield, papermaking, pesticide, cutting oil, leather, detergent and cosmetics applications
• Industrial fungicide use
• Biosludge stripping at higher dosages

The supplier says the product works by breaking the bond between bacteria and algae protein, which quickly stops microbial growth. It is described as broad-spectrum and non-oxidative.

When this product may not fit: The supplier says not to use it in cooling water systems that contain sulfur. If your system has sulfur-containing water or process streams, this guidance does not support choosing this product.

3. Choose between Grade I and Grade II

The published specification lists two grades:

The supplier also says 2%, 4%, 8% or other concentrations can be supplied on request. Before ordering, buyers should:

• State the grade or exact active concentration you need, along with the acceptable range
• Ask for the test basis and a batch certificate of analysis for active content, pH, density and the CMI/MI ratio
• Make sure your dosing calculations use the concentration you are actually buying. The published dosage guidance below refers to Grade II for sludge stripping.

4. Compare the published dosage guidance with your treatment plan

The product description gives these preferred dosages:

These figures are general guidance from the supplier, not a validated program for your site. Water chemistry, system volume, contamination level and local rules can all change the right dose. Confirm the treatment plan with a qualified water treatment specialist.

5. Check compatibility with your current treatment program

The supplier says that:

• The product works better when used with quaternary amine.
• The product can mix with most cationic, anionic and non-ionic surfactants.

The source is inconsistent about chlorine. One part says the product can mix with chlorine. The usage section says not to use it with oxidizing fungicides such as chlorine. Do not plan to combine it with chlorine or other oxidizing biocides until the supplier confirms this in writing. Follow the more cautious instruction in the meantime.

6. Plan packaging, storage and logistics

• Packaging: 200 L plastic drums, 1000 L IBCs, or packaging to customer requirements
• Storage: Store in a shaded, dry place. The stated storage period is ten months.

Set incoming inspection and stock rotation to fit the ten-month storage period. Lead times, minimum order quantities and shipping terms are not given in the confirmed material, so confirm them directly when you request a quote.

7. Plan for safe handling

The supplier's safety information says isothiazolinone is corrosive to skin. It can cause skin burns and allergic dermatitis, and the effects can last several hours. Do not let it touch skin or eyes. During handling, workers should wear protective glasses, rubber gloves and other protective equipment.

First aid for skin contact, as stated in the source: remove contaminated clothing and shoes right away, rinse with plenty of water for at least 15 minutes, apply urea acetate ointment or burn ointment to the area, and get medical help immediately.

Ask for the full safety data sheet before the first delivery and review it with your health and safety team.

8. Confirm regulatory status for your market

Biocide use is regulated in many places, and rules differ by country and application. The confirmed product material does not cover registration, approval or certification for the United States, Europe, the Middle East or Southeast Asia. Buyers need to check local requirements for their own application, especially for cosmetics, detergents and other consumer products, and get the documents they need before buying.

Buyer checklist

• Both CAS numbers (26172-55-4 and 2682-20-4) on all documents
• Grade I, Grade II or a specified custom concentration
• Certificate of analysis covering the published specification items
• Confirmation that the system contains no sulfur
• Written confirmation on compatibility with oxidizing biocides
• Packaging format (drum, IBC or custom)
• Safety data sheet and handling plan
• Local regulatory status for your market and application
• Price, lead time and terms, which must be quoted directly because they are not in the published material

To discuss grades, concentrations or packaging for Isothiazolinones (CMIT/MIT), contact Hebei Longke Water Treatment Co., Ltd. with your application details and water quality data.