Product Name: 5-Chloro-2-Methyl-4-Isothiazolin-3-One/2-Methyl-4-Isothiazolin-3-One
Common Names: CMIT/MIT, Kathon
Recommended Use: Industrial biocide, preservative in industrial and consumer products
Supplier Details: Refer to product label or manufacturer’s information
Emergency Contact: Refer to national poison center, local health services, or manufacturer emergency line
Chemical Family: Isothiazolinones
CAS Number: 55965-84-9 (mixture)
Hazard Classification: Acute toxicity – Dermal and Inhalation (Category 3), Skin corrosion/irritation (Category 1B), Serious eye damage/eye irritation (Category 1), Skin sensitization (Category 1)
Signal Word: Danger
Hazard Statements: May cause severe skin burns and eye damage, toxic if inhaled or absorbed through skin, may cause allergic skin reaction
Pictograms: Corrosive, Exclamation mark, Health hazard
Precautionary Statements: Avoid all contact with skin and eyes, do not breathe mist/vapors/spray, wear protective clothing and gloves, use in well-ventilated area, keep away from food and drink
Chemical Identity: 5-Chloro-2-Methyl-4-Isothiazolin-3-One, 2-Methyl-4-Isothiazolin-3-One
CMIT (Active Content): 1.5% - 3.7%
MIT (Active Content): 0.7% - 1.2%
Other components: Water and minor stabilizers or surfactants, approximately 95%
Impurities: Trace levels of byproducts, usually under 0.1%
Inhalation: Move exposed person to fresh air immediately. If not breathing, give artificial respiration. Seek medical attention at once.
Skin Contact: Remove contaminated clothes, rinse skin thoroughly with water for at least 15 minutes. If irritation or burning persists, seek medical advice.
Eye Contact: Flush eyes thoroughly with water for at least 15 minutes, lifting eyelids occasionally. Remove contact lenses if present and easy to do. Contact medical help without delay.
Ingestion: Rinse mouth. Do not induce vomiting. Give small amount of water to drink if the person is conscious. Call poison center or doctor.
Other Advice: Show this safety data sheet to the physician in attendance. Wash contaminated clothing before reuse.
Suitable Extinguishing Media: Carbon dioxide, dry chemical, foam or water spray
Unsuitable Media: Direct streaming water may spread the chemical
Hazardous Combustion Products: Oxides of carbon, nitrogen, sulfur and hydrogen chloride gas
Special Hazards: Vapors may be irritating or toxic, can form corrosive or toxic gases when burned
Protective Equipment: Wear self-contained breathing apparatus, protective suit against chemical exposure
Advice for Firefighters: Evacuate area, keep containers cool with water spray, contain any runoff to avoid local contamination
Personal Precautions: Wear chemical-resistant gloves, protective goggles, and appropriate respirator
Environmental Precautions: Prevent runoff into drains, sewers, and waterways, contain spill with inert material (sand, earth), avoid soil contamination
Cleanup Methods: Absorb with inert material and collect in suitable, labeled container for disposal. Ventilate area and wash spill site after material pickup is complete.
Emergency Procedures: Remove unprotected persons from the area, isolate hazard area, use non-sparking tools
Handling: Avoid direct contact with skin and eyes, use only in well-ventilated areas, wash hands thoroughly after handling, do not eat, drink or smoke while using product
Storage: Store tightly closed in original container in cool, well-ventilated, secure area away from incompatible substances (oxidizing agents, reducing agents, strong bases and acids)
Special Requirements: Protect from sunlight, prevent freezing, keep out of reach of children and unauthorized personnel
Exposure Limits: Workplace exposure limit not specifically established for this mixture; minimize exposure as much as possible
Engineering Controls: Use with local exhaust ventilation or adequate general ventilation, use closed systems where possible
Personal Protective Equipment: Gloves (nitrile or neoprene recommended), eye protection (chemical safety goggles), face shield, chemical-resistant clothing, suitable respirator if risk of vapors or fumes
Hygiene Measures: Wash thoroughly after each use, remove contaminated clothing and wash before reuse, avoid inhalation of vapor or mist
Appearance: Clear to pale yellow liquid
Odor: Characteristic, pungent odor
pH: Typically acidic, between 2.0 and 5.0
Melting Point/Freezing Point: Not applicable or below -18°C
Boiling Point: Approximately 100°C (water-based solution)
Flash Point: Not flammable
Solubility: Miscible with water
Density: Approximately 1.03 g/cm³ (at 20°C)
Vapor Pressure: Low at ambient temperature
Decomposition Temperature: May decompose under strong heating above 150°C
Chemical Stability: Stable under normal temperatures and conditions if properly stored
Reactivity: Reacts with strong bases, oxidizing agents, reducing agents
Hazardous Reactions: Decomposes on heating or contact with strong alkalis producing toxic fumes
Conditions to Avoid: High temperatures, light, contact with incompatible substances
Hazardous Decomposition Products: Hydrogen chloride, oxides of carbon, nitrogen, sulfur
Acute Toxicity: Toxic by inhalation, in contact with skin and if swallowed
Skin Corrosion/Irritation: Causes severe burns, may cause allergic skin reaction/sensitization
Serious Eye Damage/Irritation: Causes blindness or severe eye injury
Respiratory Sensitization: May cause respiratory tract irritation
Chronic Effects: Repeated exposure can cause skin sensitization
Carcinogenicity: Not listed as a carcinogen by IARC, NTP, OSHA
Mutagenicity: Not expected at occupational exposure levels, but handle with care
Reproductive Toxicity: Data not sufficient for evaluation
Ecotoxicity: Highly toxic to aquatic life, very low EC50 values for algae, invertebrates, fish
Aquatic Persistence: Degrades by hydrolysis and biodegradation, but can cause acute harm
Bioaccumulative Potential: Low due to rapid degradation but high toxicity persists during short exposure
Mobility in Soil: Moderately mobile, may leach and contaminate groundwater if released in quantity
Other Adverse Effects: Avoid release to environment, dangerous to water bodies even in case of small leaks
Methods of Disposal: Dispose through hazardous waste contractor using methods approved by local authority, do not pour into drains or environment
Contaminated Packaging: Dispose empty containers as hazardous waste, do not reuse containers
Waste Code: Consult local regulations for waste code depending on region and concentration
Special Precautions: Neutralize residues, segregate from other waste streams
UN Number: 3265
Proper Shipping Name: Corrosive liquid, acidic, organic, n.o.s. (contains 5-chloro-2-methyl-2H-isothiazol-3-one, 2-methyl-2H-isothiazol-3-one)
Transport Hazard Class: 8.0 (Corrosive substance)
Packing Group: II
Label: Corrosive
Environmental Hazards: Marine pollutant
Special Precautions: Avoid release to environment during transport, follow all regulations regarding transport of hazardous materials
Classification: Subject to restrictions under national and international chemical regulations (e.g., REACH in EU, OSHA, TSCA in US)
Inventory Listing: Listed in EINECS, TSCA, DSL/NDSL, AICS
Labeling Requirements: Label with hazard symbols, risk phrases, safety phrases per GHS and local law
Workplace Controls: Employers must provide access to MSDS, adequate training, and PPE for all users
Consumer Use: Maximum allowed concentrations and uses restricted in personal care products and household items by authorities like the EU SCCS and US EPA
Other Requirements: Periodic medical monitoring and health surveillance recommended for frequent user groups, spill and incident documentation required
