Material Safety Data Sheet (MSDS) for Styrene Isoprene Styrene (SIS)

Identification

Product Name: Styrene Isoprene Styrene (SIS)
Synonyms: SIS Block Copolymer
Recommended Use: Adhesive formulations, compounding, coatings, plastics
Manufacturer Information: Refer to official supplier contact details
Emergency Contact: Refer to chemical-specific hotline per local regulations
CAS Number: 25038-32-8

Hazard Identification

Classification: Not classified as a hazardous substance according to GHS
Physical Hazards: Dust formation possible during processing; may accumulate static electricity
Health Hazards: May cause mild mechanical irritation to eyes, skin, and respiratory system from dust
Environmental Hazards: Not regarded as harmful to the environment in solid form
Main Route of Entry: Inhalation of dust, skin and eye contact
Label Elements: No pictogram required; standard safety phrases apply
Signal Word: Not applicable
Precautionary Statements: Wear personal protection for eyes and respiratory tract when processing

Composition / Information on Ingredients

Substance: Block copolymer containing styrene and isoprene
Chemical Name: Styrene-Isoprene-Styrene copolymer
CAS Number: 25038-32-8
Content: >99% SIS
Impurities: Residual monomers < 0.1%, additives, stabilisers as specified by manufacturer
Other Ingredients: No ingredients classified as hazardous present at reportable levels

First Aid Measures

Inhalation: Move to fresh air. Seek medical attention if symptoms occur.
Skin Contact: Wash affected area with soap and water. If molten material contacts skin, cool rapidly with water. Do not peel off solidified material.
Eye Contact: Rinse with plenty of water. Remove contact lenses if present and easy to do. If irritation persists, obtain medical help.
Ingestion: Rinse mouth thoroughly with water. Drink water if conscious. Obtain medical advice.
Acute/Delayed Symptoms: Low acute toxicity, mechanical irritation possible from dust
To Medical Personnel: Treat based on symptoms, no known specific antidote

Fire-Fighting Measures

Suitable Extinguishing Media: Water spray, foam, dry chemical, carbon dioxide
Unsuitable Extinguishing Media: Direct water jet on molten polymer may scatter material
Specific Hazards: Thermal decomposition releases carbon monoxide, carbon dioxide, hydrocarbons, and possibly irritating fumes
Protective Equipment for Firefighters: Self-contained breathing apparatus and full protective clothing
Special Precautions: Keep run-off waters away from drains and watercourses. Polymer dust can form explosive mixtures with air.

Accidental Release Measures

Personal Precautions: Avoid creating dust clouds. Ensure adequate ventilation.
Protective Equipment: Wear safety glasses, gloves, and dust mask as appropriate
Environmental Precautions: Prevent entry into sewers and watercourses
Methods for Clean Up: Sweep up or vacuum spilled material. Place in suitable containers for recycling or disposal. Avoid generating dust.
Decontamination: Wash area with water after material removal if needed
Spill Reporting: Follow local regulations for spills involving chemical products

Handling and Storage

Safe Handling: Minimize dust generation and accumulation. Use only in well ventilated areas. Ground and bond containers when transferring.
Mechanical Handling Hazards: SIS may become slippery when spilled. Handle using appropriate precautions.
Storage Conditions: Store in dry, cool, well ventilated area away from heat, ignition sources, and direct sunlight. Shield from moisture contamination. Keep containers tightly closed.
Incompatible Materials: Avoid prolonged contact with oxidizing agents
Packaging Materials: Use original packaging or approved alternatives

Exposure Controls and Personal Protection

Exposure Limit Values: No occupational exposure limits established for SIS
Engineering Controls: Local exhaust ventilation recommended to control dust
Individual Protection Measures: Safety glasses with side shields or goggles, protective gloves (nitrile, PVC), dust mask or respirator where dust levels may exceed comfort levels
Hygiene Measures: Wash hands before eating, drinking, or smoking. Do not inhale dust.
Environmental Controls: Use containment to avoid environmental release during handling

Physical and Chemical Properties

Appearance: Solid, pellets or powder, white to yellowish
Odor: Faint, characteristic hydrocarbon
Odor Threshold: Not applicable
pH: Not applicable, insoluble in water
Melting Point / Freezing Point: 75-120°C (softening range)
Boiling Point: Decomposes before boiling
Flash Point: >250°C (Cleveland Open Cup)
Evaporation Rate: Not applicable
Flammability: Combustible solid
Vapor Pressure: Not applicable
Vapor Density: Not applicable
Relative Density: 0.90 - 0.95 (water = 1)
Solubility: Insoluble in water; soluble in hydrocarbons
Partition Coefficient (n-octanol/water): Not available
Auto-ignition Temperature: >380°C
Decomposition Temperature: >250°C
Viscosity: Not applicable
Explosive Properties: Dust can form explosive mixture in air

Stability and Reactivity

Chemical Stability: Stable under normal temperatures and conditions
Reactivity: No significant reactivity under standard storage and use conditions
Condition to Avoid: Exposure to heat, flame, strong oxidizers, static electricity builds up
Hazardous Decomposition Products: Carbon monoxide, carbon dioxide, styrene, hydrocarbons, and soot during decomposition
Polymerization: Not known to polymerize further under normal conditions

Toxicological Information

Acute Toxicity: Low oral and dermal toxicity expected
Skin Corrosion/Irritation: Low hazard; repeated or prolonged contact may cause mechanical irritation
Serious Eye Damage/Irritation: Dust may cause mild irritation
Respiratory Sensitization: No evidence of respiratory sensitization
Skin Sensitization: Not known to cause skin sensitization
Germ Cell Mutagenicity: No evidence of genetic toxicity
Carcinogenicity: SIS is not classified as a carcinogen by IARC, NTP, OSHA
Reproductive Toxicity: No reproductive toxicity recorded
Specific Target Organ Toxicity - Single Exposure: Not expected
Specific Target Organ Toxicity - Repeated Exposure: Not expected
Aspiration Hazard: Not expected to present an aspiration hazard

Ecological Information

Ecotoxicity: Based on polymer structure, not expected to be acutely toxic to aquatic life
Persistence and Degradability: SIS degrades very slowly in the environment (inherent persistence typical of many polymers)
Bioaccumulative Potential: Not expected to bioaccumulate due to size and insolubility in water
Mobility in Soil: Low mobility, sinks in water and adsorbs to soil
Other Adverse Effects: No known significant effects or critical hazards; avoid release to environment due to physical littering

Disposal Considerations

Waste Treatment Methods: Physical recycling preferred. Incineration in approved facility if recycling is not feasible.
Product Disposal: Comply with local, regional, and national regulations. Do not discharge into sewer systems.
Packaging Disposal: Dispose of packaging as clean plastic waste or recycle if possible.
Special Precautions: Prevent spillage into waterways to avoid littering.
Waste Code: Typically non-hazardous per local waste classification, confirm locally.

Transport Information

UN Number: Not regulated for transport
UN Proper Shipping Name: Not classified as dangerous goods
Transport Hazard Class: Not regulated
Packing Group: Not applicable
Environmental Hazards: Not a marine pollutant
Special Precautions for User: Avoid dust generation and static discharge during bulk transfers
Transport in Bulk: Refer to appropriate guidelines for plastic materials

Regulatory Information

Regulatory Status: Not a hazardous chemical as per GHS criteria
Inventory Listings: Listed on TSCA (US), EINECS/ELINCS (EU), DSL (Canada), AICS (Australia), ENCS (Japan), and relevant national inventories
Labeling Requirements: Not classified as dangerous; standard safe handling labelling applies
Other Regulations: Observe workplace controls for nuisance dust in occupational settings
Restrictions: No specific restrictions identified beyond standard chemical safety requirements
Additional Notes: User must ensure compliance with relevant local, regional, and national regulations for industrial chemicals