Material Safety Data Sheet: Styrene-Isoprene-Styrene Block Copolymer

Identification

Product Name: Styrene-Isoprene-Styrene Block Copolymer
Chemical Family: Thermoplastic Elastomer
Molecular Formula: (C8H8)x-(C5H8)y-(C8H8)x
CAS Number: 25038-32-8
Manufacturer: Major chemical manufacturer or distributor details as per supplier
Recommended Use: Adhesives, sealants, coatings, plastics, compounding applications
Emergency Contact: Refer to the supplier’s emergency phone number for incidents involving fire, spillage, or health exposure
SDS Number: Specific according to the batch or manufacturer record

Hazard Identification

GHS Classification: Not hazardous according to OSHA Hazard Communication Standard
Physical State: Solid; pellet or crumb form
Symptoms of Exposure: Minor mechanical irritation to eyes, skin, and respiratory tract due to dust
Routes of Exposure: Inhalation, skin or eye contact
Precautionary Statements: Avoid creating or breathing dust; avoid contact with eyes and skin
Signal Word: None required for polymer under GHS
Hazard Statements: Non-toxic, but fine dust can aggravate respiratory system or pre-existing lung issues
Pictograms: None required for this product
Other Hazards: Hot material causes burns; product can build static charges

Composition / Information on Ingredients

Substance/Chemical Name: Styrene-Isoprene-Styrene Block Copolymer
CAS Number: 25038-32-8
Concentration: More than 95%
Impurities/Additives: May include trace amounts of residual monomers (styrene and isoprene), antioxidant stabilizers (less than 5%), other proprietary resin modifiers as required
Hazardous Ingredients: No components above regulatory disclosure thresholds

First Aid Measures

Inhalation: Move person to fresh air and keep comfortable. Provide oxygen if breathing is difficult. Seek medical attention if rapid recovery does not occur.
Skin Contact: Wash skin with soap and warm water. If molten polymer contacts skin, cool rapidly with water but do not attempt removal of solid material. Get medical attention for burns.
Eye Contact: Rinse eyes thoroughly with water for several minutes. Remove any contacts if present and easy. Seek medical attention if irritation persists.
Ingestion: Rinse mouth thoroughly with water. Seek medical attention if large quantities have been ingested or if unwell.
Symptoms to Watch For: Mechanical irritation, redness, or swelling of exposed tissues.

Fire-Fighting Measures

Suitable Extinguishing Media: Water spray, dry chemical powder, foam, carbon dioxide
Unsuitable Media: Avoid high-pressure water that could spread molten polymer
Hazardous Combustion Products: Carbon monoxide, carbon dioxide, hydrocarbons, and trace volatile organics
Firefighting Instructions: Wear full protective gear and self-contained breathing apparatus; fight fire from safe distance; cool containers exposed to flames with water spray
Special Hazards: Molten polymer may flow and cause secondary hazards; dust may cause explosive atmospheres if dispersed in air
Flammability: Combustible when exposed to high temperatures or open flame
Explosion Data: Fine dust may present explosion risk in confined space

Accidental Release Measures

Personal Precautions: Ventilate area. Wear protective equipment to avoid breathing dust or fumes from hot material.
Environmental Precautions: Do not permit entry into drains, waterways, or soil.
Containment Methods: Sweep up solid material and collect for reuse or disposal. For molten spills, allow to solidify and remove base material.
Cleaning Methods: Avoid creating airborne dust. Use vacuum or wet methods to minimize dust generation.
Emergency Procedures: Remove sources of ignition; provide adequate ventilation; notify authorities if large spills occur.

Handling and Storage

Handling: Minimize dust generation. Avoid breathing fumes; handle molten product with care to avoid burns.
Storage Conditions: Store in dry, cool, well-ventilated area, away from direct sunlight and incompatible substances such as strong oxidizers.
Incompatible Materials: Oxidizing agents, strong acids
Storage Temperature: Below 40°C (104°F) for best quality. Protect from moisture.
Packaging Materials: Polyethylene-lined bags or drums; check for static build-up and ground containers during handling.

Exposure Controls and Personal Protection

Exposure Limits: No specific OSHA PEL or ACGIH TLV for the product. Use workplace limits for nuisance dust (10 mg/m³ total, 3 mg/m³ respirable fraction).
Engineering Controls: Use local exhaust ventilation to minimize airborne dust or fumes from heated polymer
Personal Protective Equipment:
Eye/Face Protection: Safety glasses with side shields
Skin Protection: Impermeable gloves for molten material; long sleeves
Respiratory Protection: Approved respirator for nuisance dust or fumes during processing if ventilation is inadequate
Other Protective Measures: Wash hands after handling, do not eat, drink, or smoke when using product

Physical and Chemical Properties

Appearance: Opaque, off-white or pale yellow solid; pellets or crumbles
Odor: Mild hydrocarbon, sometimes faintly sweet
Odor Threshold: Not established
pH: Not applicable (insoluble in water)
Melting Point/Range: 50–90°C (122–194°F) depending on grade
Boiling Point/Range: Not applicable (decomposes prior to boiling)
Flash Point: 343°C (closed cup, approximate)
Evaporation Rate: Not applicable
Flammability (solid/gas): Combustible solid
Vapor Pressure: Negligible at ambient conditions
Vapor Density: Not applicable
Relative Density: 0.92–0.96 (g/cm³) at 25°C
Water Solubility: Insoluble
Partition Coefficient (n-octanol/water): Not available
Auto-ignition Temperature: >400°C
Decomposition Temperature: >200°C
Viscosity: Not applicable
Explosive Properties: Dust may form explosive mixture in air
Oxidizing Properties: Not an oxidizer

Stability and Reactivity

Chemical Stability: Stable at room temperature and under recommended storage/handling
Thermal Decomposition: Begins above 200°C, may release toxic gases
Reactivity: Non-reactive under normal conditions.
Hazardous Reactions: Will not occur under recommended use
Conditions to Avoid: Excessive heat, sparks, open flames, static discharge, exposure to strong acids/oxidizers
Incompatibility: Strong oxidizers, acids, halogens
Decomposition Products: Carbon monoxide, carbon dioxide, hydrocarbons, and traces of styrene and isoprene monomers

Toxicological Information

Acute Toxicity: Low toxicity by oral, dermal, or inhalation routes
Chronic Effects: Not classified as carcinogen or mutagen by ACGIH, NTP, IARC, or OSHA
Likely Routes of Exposure: Inhalation of dust or fumes, skin, and eye contact
Irritation: Minor mechanical irritation to eyes, skin, and respiratory system possible
Sensitization: Not a known sensitizer
Carcinogenicity: Product is not considered a carcinogen; contains residual monomers in trace amounts below safety thresholds
Reproductive or Developmental Effects: No evidence from animal studies or manufacturing data
Specific Target Organ Toxicity: Not classified for single or repeated exposure
Medical Conditions Aggravated by Exposure: Pre-existing respiratory ailments may worsen with dust inhalation

Ecological Information

Ecotoxicity: Not expected to present significant hazard to aquatic or terrestrial organisms in solid form
Persistence and Degradability: Not readily biodegradable; persists in environment as inert solid
Bioaccumulation Potential: Unlikely due to high molecular weight; not expected to bioaccumulate significantly
Mobility in Soil: Insoluble—remains where it is deposited; does not leach
Other Adverse Effects: May cause harm to wildlife if ingested as litter; caution to avoid marine contamination

Disposal Considerations

Waste Disposal Methods: Dispose of in accordance with local, state, and federal laws as non-hazardous solid waste; recycling is preferable if facilities exist
Incineration: Only in approved facilities with emission controls
Packaging Disposal: Empty containers may be landfilled or recycled after cleaning
Precautions: Do not release into environment or waterways

Transport Information

UN Number: Not regulated
UN Proper Shipping Name: Not classified as dangerous goods
Transport Hazard Class: Not applicable
Packing Group: Not applicable
Transport Labels: None required
Special Precautions in Transport: Prevent package rupture; secure containers from movement during transit; keep dry
Environmental Hazards: Not a marine pollutant

Regulatory Information

OSHA Status: Not hazardous
TSCA (Toxic Substances Control Act): Listed
SARA Title III: Does not contain reportable quantities of chemicals subject to SARA Section 313
California Proposition 65: Does not require warning, as typical monomer concentrations fall below actionable limits
REACH: Registered or exempt as a polymer in accordance with EU regulations
Canadian WHMIS Classification: Not controlled; not a hazardous product
Label Elements: None required
International Inventories: Listed on relevant chemical inventories in the US, EU, Canada, Japan, Korea, China, Australia, and Philippines