Sodium Dichloroisocyanurate (SDIC) MSDS

Identification

Product Name: Sodium Dichloroisocyanurate
Chemical Family: Halogenated triazine derivative
Synonyms: SDIC, 1,3-Dichloro-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, Sodium salt
Recommended Use: Water disinfection, sanitizing agent, bleaching applications, cleaning products
Supplier Details: Manufacturer and emergency contact information usually printed on container or provided by local distributor
Product Code: Often varies by manufacturer, can be traced by batch number
CAS Number: 2893-78-9
UN Number: UN 2465

Hazard Identification

Classification: Oxidizing solid, acute toxicant, eye irritant, skin sensitizer, aquatic hazard
Hazard Pictograms: Corrosive, Exclamation Mark, Environment, Flame over Circle (oxidizer)
Signal Word: Danger
Hazard Statements: Causes serious eye irritation, may cause respiratory irritation, harmful if swallowed, contact with acids liberates toxic gas, toxic to aquatic life
Precautionary Statements: Avoid breathing dust, use personal protective equipment as required, do not release into environment, keep container tightly closed, store away from acids and combustibles

Composition / Information on Ingredients

Chemical Identity: Sodium Dichloroisocyanurate
% Content: Common formulations contain 60-63% available chlorine
Impurities: Water, sodium chloride, sodium sulfate (trace amounts depending on production)
Molecular Formula: C3Cl2N3NaO3
Molecular Weight: 219.95
Other Ingredients: Remaining portion usually comprised of stabilizers and inert ingredients to aid in handling and storage

First Aid Measures

Inhalation: Remove person to fresh air, seek medical attention if respiratory irritation develops or persists
Skin Contact: Immediately remove contaminated clothing, wash exposed area thoroughly with soap and water, seek medical attention for persistent irritation
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses if present and easy to do, continue rinsing and seek medical care
Ingestion: Rinse mouth with water, do not induce vomiting, give water if conscious, seek medical advice promptly
Note for Physician: Treat symptomatically, monitor respiratory and cardiac function, avoid administration of acids or acidic food and drink

Fire-Fighting Measures

Suitable Extinguishing Media: Use water spray, fog, or foam on fire surroundings; avoid direct water jet on product, as it may spread material
Specific Hazards: On combustion, releases toxic gases including chlorine, nitrogen oxides, hydrogen chloride
Firefighter Protection: Wear self-contained breathing apparatus and chemical protective clothing
Unusual Fire Hazards: SDIC can act as an oxidizer, increasing the intensity of a fire; may decompose explosively above 250ºC, releasing toxic fumes
Other Advice: Approach upwind, prevent runoff into drains and watercourses if safe to do so

Accidental Release Measures

Personal Precautions: Avoid dust formation, ventilate area, wear recommended PPE such as gloves, goggles, mask (P2 or better)
Environmental Precautions: Prevent excessive runoff to waterways or sewers, contain spill with dry inert material such as sand
Cleanup Methods: Scoop up spills using non-sparking tools, avoid contact with water during cleanup, avoid creating dusty conditions
Decontamination: Wash affected area with plenty of water after removal and disposal of spill, properly ventilate area before reuse
Disposal: Place waste and cleaning materials in approved containers, dispose according to local reguations

Handling and Storage

Handling: Use only in well-ventilated areas, keep product containers closed, avoid generating dust, use proper PPE, wash hands after handling any amount
Storage Conditions: Store in a cool, dry, well-ventilated location, protect from heat, direct sun, sources of ignition or incompatible materials such as acids and combustibles
Separation: Store away from acids, ammonia, reducing agents, and organic materials; keep away from food and drink
Packaging: Use original, tightly sealed packaging; avoid repackaging into incompatible or unlabelled containers
Other Notes: Rotate stock to minimize storage time, check containers periodically for leaks, corrosion, or signs of reaction

Exposure Controls and Personal Protection

Permissible Exposure Limits: No OSHA PEL established, keep air levels as low as possible; ACGIH Threshold Limit Values generally recommend lowest feasible exposure
Engineering Controls: Provide local exhaust ventilation where dust is generated, regularly monitor air conditions
Respiratory Protection: Use approved dust mask or respirator (e.g., N95, P2) when exposure possible
Skin Protection: Wear resistant gloves (nitrile, PVC), impervious coveralls
Eye Protection: Use chemical safety goggles or face shield
Hygiene Measures: Wash thoroughly after handling, remove and wash contaminated clothing before reuse, do not eat, drink or smoke near product

Physical and Chemical Properties

Appearance: White crystalline powder, sometimes granular form
Odor: Slight chlorine-like scent
Odor Threshold: Low; irritation may occur before odor is strong
pH (1% solution): Near neutral to slightly alkaline (range: 5.5–7.0)
Melting Point: Decomposes at temperatures >225°C
Solubility: Highly soluble in water
Vapor Pressure: Not volatile at room temperature
Bulk Density: Range 1.0 – 1.2 g/cm³ depending on formulation
Flash Point: Not flammable, does not flash
Other Properties: Strong oxidizing action, stable under normal handling, moisture and light sensitive

Stability and Reactivity

Chemical Stability: Stable in unopened containers, sensitive to humidity and heat
Reactivity: Reacts with acids and reduces to form toxic gases, reacts violently with ammonia, amines, reducing agents
Hazardous Decomposition: Incompatible reactions release chlorine, nitrogen trichloride, cyanuric acid, and oxides of nitrogen
Polymerization: Not known to occur
Conditions to Avoid: Exposure to moisture, heat, acids, and sources of ignition

Toxicological Information

Acute Toxicity: Oral LD50 (rat): 1671 mg/kg; Inhalation may irritate respiratory tract, skin contact may cause irritation, eye exposure causes severe irritation or burns
Chronic Effects: Prolonged or repeated exposure may lead to dermatitis, asthma-like symptoms in sensitive individuals
Corrosivity: Not classified as corrosive to skin, strongly irritating to eyes
Carcinogenic Potential: Not classed as carcinogen by IARC or NTP
Other Effects: May aggravate pre-existing respiratory or skin conditions, ingestion of large amounts likely to cause gastrointestinal distress

Ecological Information

Aquatic Toxicity: Highly toxic to aquatic life, especially fish, with LC50 < 1 mg/L for certain organisms
Persistence and Degradability: Hydrolyzes in water, producing active chlorine and cyanuric acid which degrades slowly
Bioaccumulation: Not expected to bioaccumulate, breakdown products may persist
Mobility in Soil: Dissolves and migrates readily in moist environments
Other Ecological Risks: Chemical can result in fish kills when released in concentration, long-term exposure harmful to aquatic plants and invertebrates

Disposal Considerations

Waste Disposal Methods: Dispose of waste according to local, state, and federal laws; avoid discharge to surface water
Container Handling: Empty containers retain residue, should not be reused, preferably punctured and sent to landfill or approved waste facility
Recommended Disposal Practice: Neutralize small amounts with large volumes of water and sodium thiosulfate before disposal, do not dump near watercourses
Safety Note: Never mix with combustible or reactive waste streams

Transport Information

UN Number: UN 2465
Proper Shipping Name: Sodium Dichloroisocyanurate, Dry or Sodium Dichloroisocyanurate, Hydrated
Hazard Class: 5.1 (Oxidizer)
Packing Group: II
Labeling Requirements: Oxidizer; ensure packaging is sealed, check compatibility with vehicular and local code
Transport Regulation: Complies with ADR/RID, IMDG, ICAO/IATA depending on route; secure against movement and moisture during transit
Marine Pollutant: Classified as marine pollutant

Regulatory Information

TSCA Inventory: Listed
REACH Status: Registered substances, check with supplier for details
OSHA Regulation: Subject to Hazard Communication Standard
WHMIS Classification (Canada): Category C (Oxidizing Material), D2B (Toxic Material causing other effects)
SARA Title III: Not listed for Section 302 or 313, subject to Section 311/312 reporting
Additional Local Regulations: May have additional restrictions or labeling requirements by region; always review with in-country guidelines and transportation rules