Product name: 3-Methyltetrahydrothiophene 1,1-Dioxide
Synonyms: 3-Methylsulfolane
CAS Number: 3185-99-7
Recommended use: Industrial solvent, chemical intermediate
Supplier details: Company name, address, emergency phone number
Emergency contact: CHEMTREC 24-hour emergency line or local equivalent
Intended use: Industrial, laboratory, not for consumer usage
Restrictions: Not approved for food or pharmaceutical applications
Classification (GHS): Eye irritation, category 2A; Skin irritation, category 2; Specific Target Organ Toxicity, single exposure category 3
Label elements: Signal word: Warning
Hazard statements: Causes skin and serious eye irritation, may cause respiratory irritation
Pictograms: Exclamation mark
Precautionary statements: Avoid breathing mist or vapour, wash thoroughly after handling, wear protective gloves and equipment, use only outdoors or in well-ventilated area
Potential health effects: Contact with liquid or vapours may cause redness, discomfort, blurred vision, respiratory symptoms like coughing, sore throat, headache
Environmental hazards: May cause long-term effects in aquatic environments if not properly contained
Component: 3-Methyltetrahydrothiophene 1,1-Dioxide
Chemical formula: C5H10O2S
Molecular weight: 134.20 g/mol
Concentration: ≥98% by weight
Impurities: Water (<1%), residual solvents (<1%)
Additives: None known
Inhalation: Move to fresh air, keep warm and at rest, seek medical attention if symptoms like coughing, shortness of breath, drowsiness develop
Skin contact: Remove contaminated clothing, wash skin with soap and plenty of running water for at least 15 minutes, if irritation persists, get medical advice
Eye contact: Rinse cautiously with water for several minutes, remove contact lenses if present and easy to do, continue rinsing, immediate medical attention if irritation continues
Ingestion: Rinse mouth with water, do not induce vomiting, seek medical help without delay
Notes for doctor: Treat symptomatically based on clinical judgement, respiratory symptoms may benefit from oxygen
Suitable extinguishing media: Water spray, foam, dry chemical powder, carbon dioxide
Unsuitable media: Direct water jets may spread spills
Specific hazards: Incomplete combustion may yield toxic gases like carbon monoxide, sulfur oxides
Protective equipment: Self-contained breathing apparatus and full protective clothing
Advice for firefighters: Stay upwind, prevent runoff into drains, cool containers exposed to fire with water mist
Flash point: Above 100°C (closed cup, approximate value)
Thermal decomposition: Products include carbon oxides, sulfur oxides, volatile organic compounds
Personal precautions: Evacuate unnecessary personnel, use appropriate PPE including gloves, goggles, chemical-resistant clothing
Environmental precautions: Prevent release into sewers, soil, or watercourse, contain spill using inert absorbent material
Procedures for cleaning up: Absorb with inert material (sand, earth, diatomaceous earth), shovel into suitable containers for disposal, ventilate area, wash spill site with plenty of water
Additional tips: Notify authorities if significant release occurs beyond workplace
Handling: Keep containers tightly closed, avoid inhalation of vapours, contact with skin or eyes, ensure adequate ventilation or use local exhaust in high-use areas
Storage: Store in a dry, cool, well-ventilated place, away from incompatible substances such as strong oxidizers and acids, keep away from flame or sources of ignition
Packaging materials: Use containers made of compatible material (such as HDPE or glass), clearly label, inspect regularly for leaks
Hygiene: Wash hands and face thoroughly after handling, change contaminated clothing
Incompatibilities: Avoid storing near nitric acid, perchlorates, strong bases
Engineering controls: Use local exhaust ventilation, eye wash stations, safety showers in work area
Occupational exposure limits: No specific national limits set, work as if general solvent exposure OELs apply (50 ppm TWA as a reference), avoid prolonged exposure
Personal protective equipment: Chemical-resistant gloves (nitrile, neoprene), splash-proof chemical safety goggles, face shield if splashing risk, impervious apron or lab coat, suitable respirator if ventilation insufficient
Environmental controls: Prevent chemical from entering drains, use bunded storage, spill control plans
Workplace practices: Do not eat, drink, or smoke during use, monitor air concentrations, provide hazard training
Appearance: Colorless or slightly pale liquid
Odor: Mild, slightly sulfurous
Odor threshold: Data not readily available
pH: Neutral (aqueous solution)
Melting point/freezing point: 25-28°C (some sources quote slightly variable values)
Boiling point: 275-280°C at 1 atm
Flash point: Above 100°C
Evaporation rate: Lower than water
Flammability: May burn at higher temperatures
Upper/lower explosion limits: Not established
Vapor pressure: <0.5 mmHg at 20°C
Vapor density: Heavier than air
Relative density: Approx. 1.20 g/cm³ at 20°C
Solubility in water: Completely miscible
Partition coefficient (n-octanol/water): Estimated log Kow -1.2
Auto-ignition temperature: Data not established
Decomposition temperature: Above 200°C
Viscosity: Moderate (3-7 cP at 20°C)
Chemical stability: Stable under normal use and storage conditions
Conditions to avoid: High heat, open flame, prolonged exposure to light
Incompatible materials: Strong oxidizing agents, strong acids, bases
Reactivity with other chemicals: Potential for exothermic reactions with strong oxidizers
Decomposition products: Toxic sulfur oxides, carbon monoxide, carbon dioxide, volatile organic compounds
Polymerization hazard: Not known to polymerize
Special sensitivities: Prolonged contact with metals may cause slow corrosion
Acute toxicity: Oral LD50 (rat) estimated >2000 mg/kg (low acute toxicity), dermal LD50 (rabbit) >2000 mg/kg
Skin corrosion/irritation: Causes moderate to severe irritation on prolonged contact
Serious eye damage/irritation: Causes eye irritation, redness, blurred vision
Respiratory or skin sensitization: Not sensitizing in animal studies
Germ cell mutagenicity: Not expected to be mutagenic
Carcinogenicity: Not listed as a known carcinogen by IARC, NTP, OSHA
Reproductive toxicity: No evidence of reproductive effects
Specific target organ toxicity: Vapours may temporarily affect respiratory system
Repeated dose toxicity: Potential to cause reversible irritation of mucous membranes at high levels
HEALTH HAZARD SUMMARY: Short-term effects primarily irritant in nature, no chronic toxicity found in published data
Ecotoxicity: Low acute toxicity to aquatic life, but large spills can cause oxygen depletion due to high BOD
Persistence and degradability: Readily biodegradable in water and soil, half-life approximately 7-14 days in aerobic conditions
Bioaccumulative potential: Low, because of water solubility and low log Kow
Mobility in soil: High mobility, leaches readily in moist ground
Other adverse effects: Spilling large volumes can alter local water pH
Recommendations: Prevent release to surface water, collect and treat wastewater before disposal
Waste treatment methods: Container and unused chemical should be sent to licensed hazardous waste disposal facility
Product disposal: Dilute with plenty of water, neutralize as required, incinerate or treat according to local regulations
Contaminated packaging: Rinse empty drums with water, collect rinsate for authorized disposal
Regulatory classification: Classified as hazardous waste due to irritant properties, not listed as persistent organic pollutant
Precautions: Do not dispose of with general waste, prevent entry into sewers
Other considerations: Keep all disposal documentation for regulatory inspections
UN Number: Not classified under a UN number
Proper shipping name: 3-Methyltetrahydrothiophene 1,1-Dioxide
Transport hazard class: Not regulated under ADR/RID, IMDG, IATA for normal shipments
Packing group: Not assigned
Special transport precautions: Avoid impact or extreme temperatures during transport, protect containers from damage, ensure all current road, rail, or sea regulations are met for hazardous materials
Environmental hazard: Not marine pollutant
Other transport requirements: Include safety documentation and emergency phone numbers in shipping manifest
EU regulations: REACH registration may be required above threshold tonnages, classified for irritant properties, requires SDS provision under CLP
US regulations: Not on the TSCA 12(b) list, regulated as an industrial chemical under OSHA Hazard Communication
Canada: Not listed under WHMIS as a controlled product; imported compounds must meet Canadian Environmental Protection Act requirements
Other national legislation: Worker exposure limits may apply, environmental permit needed for bulk use or disposal
Labelling: Containers must show product name, warning pictograms, signal word, hazard and precaution statements
Restrictions: Use only by trained, competent personnel following safety and handling instructions
Inventory status: Present on EINECS, DSL, AICS
