Material Safety Data Sheet for Sodium Dichloroisocyanurate Dihydrate

Identification

Product Name: Sodium Dichloroisocyanurate Dihydrate
Chemical Formula: C3Cl2N3NaO3·2H2O
CAS Number: 51580-86-0
Recommended Use: Disinfection in water treatment, household cleaners, swimming pools
Supplier Details: Manufacturer contact information, address, and emergency phone numbers must be available on packaging.
Synonyms: SDIC, Troclosene Sodium Dihydrate, Sodium Dichloro-s-triazinetrione Dihydrate

Hazard Identification

GHS Classification: Oxidizing Solid Category 2, Acute Toxicity Oral Category 4, Eye Irritation Category 2A, Skin Irritation Category 2, Aquatic Acute Category 1
Signal Word: Warning
Hazard Statements: May intensify fire; oxidizer. Harmful if swallowed. Causes skin irritation. Causes serious eye irritation. Very toxic to aquatic life.
Pictograms: Flame over circle, exclamation mark, dead fish/tree (environment)
Precautionary Statements: Avoid breathing dust. Wash hands thoroughly. Do not eat, drink or smoke while using. Keep away from clothing or combustible materials. Avoid release to the environment. Wear protective gloves, protective clothing, eye and face protection.

Composition / Information on Ingredients

Chemical Name: Sodium Dichloroisocyanurate Dihydrate
Concentration: Typically 98%
CAS Number: 51580-86-0
Impurities: Water (dihydrate form), minor byproducts possible.
Other Components: No hazardous impurities considered relevant according to available data.

First Aid Measures

Inhalation: Remove person to fresh air. Seek medical attention if symptoms develop or persist, especially if breathing is difficult.
Skin Contact: Wash affected areas thoroughly with water and mild soap. Remove contaminated clothing. Get medical attention if irritation continues.
Eye Contact: Rinse cautiously with water for at least 15 minutes. Hold eyelids open to ensure thorough flushing. Seek immediate medical advice.
Ingestion: Rinse mouth. Do not induce vomiting. Drink water if conscious. Seek medical help right away.
Most Important Symptoms: Respiratory tract irritation, skin and eye irritation, possible gastrointestinal effects if ingested.
Notes for Physician: Treat symptomatically. Monitor respiratory and cardiovascular functions.

Fire-Fighting Measures

Suitable Extinguishing Media: Water spray, foam, dry chemical, carbon dioxide. Use large amounts of water to cool surrounding area.
Unsuitable Media: Do not use water jet directly on product. Avoid using dry combustibles as extinguishing agents.
Special Hazards: Product oxidizes and can accelerate burning of other materials. Releases toxic chlorine, nitrogen oxides, and cyanuric acid on decomposition.
Advice for Firefighters: Wear self-contained breathing apparatus and full protective gear. Use water spray to cool containers. Avoid inhaling gases or vapors.
Other Recommendations: Prevent runoff from fire-fighting into drains or watercourses to avoid environmental contamination.

Accidental Release Measures

Personal Precautions: Evacuate area. Ensure adequate ventilation. Wear appropriate protection, including gloves, safety goggles, and respiratory protection as needed.
Environmental Precautions: Prevent spilled material from entering drains, sewers, or natural waterways. Report to authorities if large amounts enter environment.
Containment Methods: Sweep up and collect in suitable containers. Avoid generating dust.
Clean-Up Procedures: Use non-combustible absorbent material. Do not use sawdust or organic materials. Wash spill area thoroughly with water after clean-up.
Disposal: Dispose of contaminated materials in accordance with local regulations for hazardous solid waste.

Handling and Storage

Handling: Use in well-ventilated space. Avoid contact with eyes, skin, and clothing. Prevent dust formation and accumulation. Do not mix with acids, ammonia, or other chemicals unless intended for use.
Storage Requirements: Store in tightly closed original container in a dry, cool, and well-ventilated area. Keep separated from incompatible materials such as acids, reducing agents, and flammable substances.
Specific Considerations: Keep away from moisture. Protect against physical damage and direct sunlight.

Exposure Controls and Personal Protection

Occupational Exposure Limits: No established exposure limits available for this substance.
Engineering Controls: Use local exhaust ventilation or general room ventilation to minimize dust exposure.
Personal Protective Equipment: Wear chemical-resistant gloves, safety goggles, and suitable protective clothing. Use NIOSH-approved respirators for high-exposure conditions.
Hygiene Measures: Wash hands and face after handling. Remove contaminated clothing before entering eating areas.

Physical and Chemical Properties

Appearance: White crystalline powder or granular
Odor: Faint chlorine-like smell
pH (1% solution): 5.0 – 7.0
Melting Point: Decomposes before melting
Solubility: Readily soluble in water
Density: Approx. 1.1 g/cm³
Boiling Point: Not applicable
Vapor Pressure: Negligible
Flash Point: Not flammable
Oxidizing Properties: Strong oxidizer
Other Properties: Decomposes on heating, releasing toxic gases such as chlorine.

Stability and Reactivity

Chemical Stability: Stable under recommended storage and handling conditions.
Reactivity: Reacts with acids and ammonia, releasing toxic chlorine gas. Reacts with organic materials, combustibles, and reducing agents, sometimes energetically.
Conditions to Avoid: Heat, moisture, direct sunlight, acids, reducing agents.
Incompatible Materials: Ammonia, acids, oxidizable and flammable substances.
Hazardous Decomposition Products: Chlorine, nitrogen oxides, isocyanic acid.

Toxicological Information

Acute Toxicity: Oral LD₅₀ (rat) 1420 mg/kg
Skin Corrosion/Irritation: Causes irritation,
Serious Eye Damage/Irritation: Causes severe irritation
Inhalation: Dust can cause respiratory tract irritation
Ingestion Effects: Nausea, vomiting, abdominal pain, chemical burns possible
Chronic Effects: No known chronic toxicity with normal occupational use
Carcinogenicity: Not classified as carcinogenic (IARC, NTP, OSHA)
Mutagenicity: No data indicating mutagenicity.
Other Information: No reproductive effects reported in available studies.

Ecological Information

Aquatic Toxicity: Very toxic to aquatic organisms; LC₅₀ (fish, 96h): 0.25 mg/L
Persistence and Degradability: Contains chlorine that can react in water and soil, significant bioaccumulation not expected
Bioaccumulative Potential: Low
Mobility in Soil: Dissolves in water, may move through soil to water systems
Environmental Precautions: Avoid discharge to water systems, inform authorities if large accidental releases occur
Other Adverse Effects: Toxic to aquatic plants and invertebrates

Disposal Considerations

Waste Disposal: Collect material in labeled hazardous waste containers. Do not mix with flammable waste. Dispose of according to local, regional, and national regulations.
Container Disposal: Empty containers can still pose hazards—rinse thoroughly before discarding.
Special Precautions: Avoid release to drains or environment during disposal process.

Transport Information

UN Number: UN 3077
UN Proper Shipping Name: Environmentally hazardous substance, solid, n.o.s. (Sodium Dichloroisocyanurate Dihydrate)
Transport Hazard Class(es): 9 (Miscellaneous Dangerous Substances and Articles)
Packing Group: III
Marine Pollutant: Yes
Special Transport Precautions: Keep dry, avoid contact with combustible or organic materials during transport.
Additional Information: Ensure packaging is secure and labeled in compliance with transportation regulations.

Regulatory Information

Inventory Status: Listed in US TSCA, EU REACH, Canada DSL/NDSL, Australia AICS, and other chemical inventories.
Labeling Requirements: Appropriate GHS labels, hazard and precautionary statements must appear on containers.
Safety, Health, and Environmental Regulations: Subject to regulation under OSHA Hazard Communication Standard, EPA regulations for disinfection agents, international transport rules for hazardous materials.
Restrictions: Product use may face regional restrictions for application in potable water or consumer products.
Community Right-to-Know: May appear on selected community hazard lists due to aquatic toxicity.