Material Safety Data Sheet – Butyl Rubber (IIR)

Identification

Product Name: Butyl Rubber
Chemical Name: Isobutylene-Isoprene Rubber
Chemical Formula: C4H8 (major monomer), C5H8 (minor monomer)
Synonyms: IIR, PIB
CAS Number: 9010-85-9
Recommended Use: Manufacturing tires, hoses, sealants, adhesives, protective clothing
Supplier Details: Manufacturer's address, contact number, emergency phone number

Hazard Identification

GHS Classification: Not classified as hazardous under GHS
Physical Hazards: May build up static charge, can release combustible dust in fine form
Health Hazards: Low toxicity, dust may irritate eyes, respiratory tract, or skin for sensitive individuals
Environmental Hazards: Not hazardous for water, possible persistence as solid waste

Composition / Information on Ingredients

Main Component: Butyl Rubber (isobutylene 97%-99%, isoprene 1%–3%)
Additives: Sometimes includes stabilizers, fillers, process oils (amounts vary, detailed list available from supplier)
Impurities: Trace residues from polymerization, minor levels of particulate matter; not expected to contribute to hazard profile

First Aid Measures

Inhalation: Remove affected person to fresh air if exposed to dust or fumes; seek medical attention for symptoms
Skin Contact: Wash skin thoroughly with soap and water; seek care if rash or irritation persists
Eye Contact: Rinse cautiously with water; remove contact lenses if present and easy to do; continue rinsing, seek medical assistance if irritation continues
Ingestion: Unlikely in normal use, if swallowed rinse mouth with water, consult physician for persistent symptoms

Fire-Fighting Measures

Suitable Extinguishing Media: Foam, dry chemical, carbon dioxide, or water spray
Unsuitable Extinguishing Media: Do not use direct water stream, can spread molten product
Specific Hazards: Emits toxic fumes such as carbon monoxide, carbon dioxide, hydrocarbons when burning
Protective Equipment for Firefighters: Full protective clothing and self-contained breathing apparatus
Special Procedures: Stay upwind, cool exposed containers with water spray to prevent heating, avoid runoff entering drains

Accidental Release Measures

Personal Precautions: Wear appropriate personal protective equipment to avoid contact or inhalation of dust
Environmental Precautions: Prevent material from entering waterways or drains; large quantities may become physical barrier in water
Methods for Clean-Up: Collect solid material and place in waste container; vacuum cleaner with HEPA filter works for powder or fragmented forms; wash spill site with water after material removal

Handling and Storage

Precautions for Safe Handling: Minimize dust generation; avoid breathing dust or fumes from hot process; take precautions against static discharge; use in well-ventilated areas
Hygiene Measures: Wash hands before eating, drinking, or smoking; prohibit food and beverages in processing area
Storage Requirements: Store away from strong oxidizers, sunlight, heat sources; keep container tightly closed in dry, cool, and well-ventilated area away from direct flame or ignition sources

Exposure Controls and Personal Protection

Exposure Limits: No specific occupational exposure limits; monitor dust concentration to keep below nuisance dust levels (ACGIH TLV 10 mg/m³ total, 3 mg/m³ respirable fraction)
Engineering Controls: Adequate general ventilation; local exhaust for dusty operations
Personal Protective Equipment: Safety glasses or goggles, dust mask or respirator (N95 or better for handling powder), gloves (PVC, nitrile, or latex), protective clothing to minimize skin contact
Work Practices: Remove contaminated clothing, maintain eyewash and safety shower stations near process areas

Physical and Chemical Properties

Appearance: Synthetic rubber, white or off-white to gray, solid, may be in bales, sheets, crumbs, or powder
Odor: Faint hydrocarbon
pH: Not applicable (solid, non-aqueous)
Melting Point: ~350°C (decomposition)
Boiling Point: Not applicable
Flash Point: >200°C (estimated, varies with formulation)
Flammability: Not classified as flammable, can burn at high temperatures
Vapor Pressure: Negligible
Density: 0.91–0.93 g/cm³
Solubility: Insoluble in water, swells in hydrophobic solvents and oils
Viscosity: Not applicable

Stability and Reactivity

Chemical Stability: Stable under normal storage and handling conditions
Reactivity: Inert to most chemicals, may react with strong oxidizers (e.g., peroxides, nitrates)
Conditions to Avoid: Excess heat, open flame, direct sunlight, sources of ignition, finely divided dust may pose explosive risk
Incompatible Materials: Strong acids, oxidizing agents
Hazardous Decomposition Products: Carbon monoxide, carbon dioxide, hydrocarbons on combustion or excessive heating

Toxicological Information

Acute Toxicity: Not classified as acutely toxic by inhalation, ingestion, or dermal exposure; minimal risk in normal use
Chronic Effects: No evidence of carcinogenicity or reproductive toxicity in humans
Routes of Exposure: Inhalation of dust, skin contact
Symptoms: Dust may cause mild respiratory irritation, skin may become dry or irritated after prolonged contact
Sensitization: No documented reports of occupational allergic reactions to IIR
Mutagenicity and Carcinogenicity: No component classified as mutagenic or carcinogenic by IARC, NTP, OSHA

Ecological Information

Ecotoxicity: Not expected to be hazardous for aquatic organisms at environmental concentrations
Persistence and Degradability: Resistant to biodegradation, persists as solid waste in soil and water
Bioaccumulation Potential: Unlikely to bioaccumulate
Mobility in Soil: Low mobility, does not dissolve or leach into groundwater
Other Adverse Effects: Solid pieces may pose physical hazard to wildlife if unmanaged in environment

Disposal Considerations

Waste Disposal Methods: Reuse and recycling preferred; landfill as non-hazardous solid waste if recycling impractical; do not incinerate in open air
Contaminated Packaging: Dispose of in compliance with local, regional, and national requirements; rinse containers, remove labels if possible
Special Precautions: Handle waste in accordance with community guidelines; prevent release of dust or fragments into water or soil

Transport Information

UN Number: Not regulated for land, sea, or air transport
Transport Hazard Class: Not classified as dangerous cargo
Packing Group: Not applicable
Environmental Hazards: None identified
Special Precautions for Users: Avoid damage to packaging, avoid excessive heat or ignition sources during transport, secure bales or packages to prevent physical hazards

Regulatory Information

OSHA Status: Not hazardous under OSHA Hazard Communication Standard
TSCA Inventory: Listed
REACH Registration: Complies with relevant requirements for registration and evaluation
WHMIS Classification: Not controlled
Other Regulations: Satisfies national and international safety and environmental regulations as a non-hazardous article
Labeling Requirements: No hazard pictograms required, safety information should be available to end users
Chemical Safety Assessment: Not required for articles with no classified hazards