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Chemical name: Dimethyl disulfide
Synonyms: DMDS, Methyl disulfide
CAS number: 624-92-0
Appearance: clear, pale-yellow liquid
Odor: powerful, garlic or onion-like smell
Common uses: found in oil refining, soil fumigation, intermediates for pesticides, and added into some fuels as a sulfur source
Solubility: partly soluble in water, readily miscible with most organic solvents
Molecular formula: C2H6S2
GHS Classification: Flammable liquid, acute toxicity (oral and inhalation), hazardous to aquatic environment
Risk of fire: catches fire from heat, sparks, or open flames
Health risks: can cause headaches, dizziness, nausea, or respiratory issues after exposure
Eye and skin contact: causes irritation, possible chemical burning on prolonged contact
Chronic hazards: repeated exposure increases risk of long-term nervous system effects
Environmental impact: toxic to aquatic life if released straight into rivers, lakes, or soil
Main component: Dimethyl disulfide, usually above 99% purity in industrial grades
Impurities: trace amounts of related sulfur compounds can be present, especially methyl mercaptan
Stabilizers or additives: not generally added in high-purity chemical production
Other chemicals: in commercial streams, sometimes mixed with hydrocarbons but not in pure product
Inhalation: remove affected person from exposure into fresh air, keep warm and at rest, seek medical help especially if breathing trouble starts
Skin contact: wash right away with soap and fresh water, get rid of contaminated clothing, seek medical advice for ongoing irritation
Eye contact: rinse eyes gently under cool running water for ten to fifteen minutes, keep eyelids open, call a doctor if symptoms don’t stop
Ingestion: do not make the person vomit, rinse mouth with water if conscious, get emergency help without delay
Symptoms to watch: respiratory distress, nausea, vomiting, drowsiness, chemical burns
Suitable extinguishing media: use foam, dry chemical, or CO2, avoid water jets because of flashback risks
Special hazards: DMDS vapors form explosive mixtures with air and spread easily as the vapors are heavier than air
Protective actions: wear full self-contained breathing apparatus, chemical-protective suit if there’s a heavy release
Fire decomposition: can give off sulfur dioxide, carbon oxides, and dangerous fumes
Advice for firefighters: stay upwind, stop leak if safe, cool exposed containers with water spray
Explosion risk: vapor may travel far from the source and ignite elsewhere
Personal precautions: evacuate spill area, control ventilation, avoid breathing in vapors
Protective equipment: wear gloves, goggles, and proper chemical-resistant clothing
Environmental precautions: keep material away from drains and waterways, report to local authorities in case of big spills
Containment: use absorbent materials like sand or earth, don’t use sawdust
Cleanup method: collect into suitable sealed container for safe disposal, ventilate the area well, wash hands thoroughly after handling
Handling: use only in well-ventilated places, avoid static build-up by grounding and bonding containers and equipment, keep away from ignition sources
Avoid contact: especially with skin and eyes, don’t inhale vapors, never eat or smoke where DMDS is handled
Storage: keep tightly closed in approved flammable-liquid containers, store cool and dry, far from acids, oxidizers, and sources of heat or sparks
Labeling: containers should carry hazard warnings that match your regulations
Other precautions: rotate stocks, check containers regularly for leaks or damage, provide quick access to eyewash and showers
Workplace exposure limits: check updates from OSHA, NIOSH, or your national guidance for recommended levels
Engineering controls: use exhaust ventilation to remove vapors from work areas
Personal protection: gloves made of nitrile or neoprene, chemical goggles or face shield, flame-resistant clothing, approved organic vapor respirators in high vapor areas
Hygienic practices: wash hands after use, remove and wash clothing that got splashed, shower before leaving work where large-scale exposure hazards exist
Environmental controls: keep filter systems running, rehearse spill response plans
Appearance: clear, pale-yellow liquid
Odor: acrid, onion-like, often used as a gas warning
Boiling point: about 109°C
Melting point: around -85°C
Flash point: about 16°C (closed cup), catches fire at low heat
Vapor pressure: high, so vapor dwells near floor
Density: close to 1.067 g/cm³ at 20°C
Solubility: only slightly soluble in water, fully mixes with most polar solvents
Vapor density: heavier than air, builds up in pits and low spots
Explosive limits: forms flammable mixtures with air under many conditions
Chemical stability: stable when sealed and kept away from light and heat
Hazardous reactions: reacts with strong oxidizers, acids, peroxides, alkali metals
Polymerization: unexpected self-reaction unlikely but possible under intense heat
Toxic decomposition: fire or high heat produces sulfur oxides and dangerous organic fumes
Incompatible materials: oxidizing agents, acids, powerful bases, sources of ignition, metals like sodium or potassium can accelerate hazardous breakdown
Routes of exposure: breathing the vapor, swallowing, skin absorption, direct eye contact
Short-term effects: breathing causes irritation, cough, headache, nausea, or dizziness, skin burns possible with concentrated, repeated exposure
Long-term effects: memory loss, nerve damage, ongoing respiratory problems reported in some chronic exposures
Animal studies: rats exposed to high doses showed increased liver and kidney weights, but toxicity levels differ by species
Carcinogenicity: not listed by NTP or IARC as known human carcinogen
Sensitization: repeated contact can trigger skin or lung sensitivity in some people
Toxicity to organisms: severely toxic to aquatic animals, particularly fish and invertebrates
Mobility: vapor spreads quickly, liquid can seep into soil and spread farther
Persistence: breaks down fairly rapidly in air and water if well-aerated, but local spills can cause long-term river or sediment contamination
Bioaccumulation: not significant for DMDS, but break-down byproducts can be more persistent
Discharge controls: routine waste streams should not include DMDS residues; accidental releases need quick reporting and clean-up
Waste management: treat as hazardous chemical waste, incinerate in approved facility if available
Forbidden methods: do not pour into drains, watercourses, or open ground
Container treatment: fully empty, triple-rinse, and puncture before sending to hazardous recycling or disposal
Regulatory guidance: follow local, state, and national laws strictly to avoid environmental harm
Best practice: assign chemical waste only to certified handlers with traceable documentation of safe destruction
Shipping classification: considered dangerous goods by road, sea, and air
UN Number: categorized under UN 2381 for DMDS
Proper shipping name: Dimethyl disulfide, flammable liquid
Packing group: group II, medium hazard
Label requirements: flammable liquid symbol, environmental hazard symbol may apply in some routes
Special transportation instructions: secure containers upright, stow away from food, handle with care to prevent leaks
US regulations: TSCA listed, SARA Title III reporting may apply in big releases, OSHA classifies as flammable and acutely toxic
European regulations: covered under REACH, CLP rules apply for workplace safety and public protection, labeled as hazardous substance
Worker safety: must follow training under relevant chemical safety frameworks, with access to up-to-date safety information
Community right-to-know: mandatory reporting of major accidents or spills to local environmental authorities
