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Common name: Glass Microspheres
Chemical characterization: Soda-lime-borosilicate glass
Typical appearance: Hollow or solid glass beads, white or transparent, very lightweight
Main uses: Paint additives, lightweight fillers for composites, abrasives for cleaning, insulating materials in construction, reflective materials in road marking
Physical hazards: Tiny particles can create slippery surfaces if spilled
Health risks: Inhalation of dust during handling or processing may irritate respiratory tract; dust contact with eyes may cause mild irritation; not classified as toxic under typical workplace exposure scenarios
Fire and explosion: Non-combustible, non-flammable, but dust can slightly reduce visibility in confined areas
Main ingredients: Silicon dioxide, sodium oxide, calcium oxide, boron oxide
Possible trace substances: Aluminum oxide, magnesium oxide, iron oxide in minor amounts
Impurities: Heavy metals may appear at negligible concentrations, below regulatory concern levels for most industrial classifications
Inhalation: Remove to fresh air. Use water rinse if irritation develops.
Eye contact: Rinse thoroughly with clean water for several minutes. Seek medical attention for persistent discomfort.
Skin contact: Wash with soap and water to remove particles. Friction may lead to minor mechanical irritation.
Ingestion: No known adverse effects expected from small accidental ingestion. Drink water if discomfort occurs.
Suitable extinguishing media: Dry chemical, water spray, foam, or carbon dioxide—all standard agents are applicable since the material does not fuel fires.
Special protective equipment: Firefighters should use breathing apparatus to avoid dust inhalation.
Hazardous combustion products: Microspheres do not produce harmful gases or vapors when exposed to flame, though dense dust may hamper vision during fire emergencies in enclosed areas.
Spill control: Sweep or vacuum up material to avoid dust generation. Use methods that minimize airborne particulates.
Environmental precautions: Prevent further release into waterways or drains. Collect spilled beads for reuse or proper disposal.
Cleaning up: Use wet cleaning techniques in large spills to limit dust. Avoid sweeping dry material in enclosed areas whenever possible.
Handling practices: Avoid practices that generate airborne dust. Wear appropriate respiratory protection if processing in areas with poor ventilation.
Good storage methods: Store in closed containers, in dry and cool locations, away from incompatible substances like hydrofluoric acid, which can cause glass to degrade.
Prevention of buildup: Routine housekeeping can stop accumulation on work surfaces. Avoid mixing with organic dusts to reduce static discharge or dust explosion risk, even if the product itself doesn’t burn.
Occupational exposure limits: The main concern comes from nuisance dust. Adhere to limits set by agencies such as OSHA and ACGIH for particulate matter not otherwise classified.
Engineering controls: Local exhaust ventilation reduces airborne dust. Enclosed transfer systems are ideal for large-scale, high-volume use.
Personal protective equipment: Dust masks or respirators, safety goggles, and gloves protect skin and mucous membranes. Clean protective clothing helps prevent contamination outside the workplace.
Appearance: Fine, lightweight, bead-shaped glass particles that appear either clear or opaque white
Odor: None
Melting point: Above 700°C depending on composition
Density: Ranges generally from 0.1 to 0.6 grams per cubic centimeter for hollow types
Solubility: Insoluble in water and common solvents
pH: Neutral (not reactive with water)
Stability: Highly stable under normal atmospheric and storage conditions
Chemical stability: Remains stable at room temperature under recommended storage and handling conditions
Reactivity: Generally unreactive. Avoid exposure to strong acids, particularly hydrofluoric acid, which will attack and dissolve the silica in the glass.
Hazardous reactions: No dangerous polymerization or decomposition expected. High-temperature exposures can alter surface characteristics but do not cause spontaneous hazardous breakdowns.
Acute effects: Short-term exposure causes only minor irritation in sensitive individuals; symptoms resolve with removal from exposure
Chronic risks: Prolonged inhalation of significant amounts of dust over many years could aggravate conditions like bronchitis, similar to other non- fibrous mineral dusts. No evidence ties glass microspheres directly to silicosis or cancer.
Sensitization: Documented reports do not identify this material as a skin or respiratory sensitizer.
Aquatic impact: Unlikely to harm aquatic life due to insolubility and chemical inertness. Beads may accumulate in sediment but do not leach hazardous substances.
Biodegradability: Glass beads persist in the environment since they do not break down biologically.
Bioaccumulation: No evidence shows that glass microspheres build up in living organisms or move up the food chain.
Waste management: Sweep up spills and reuse where possible. Dispose of non-reusable material through approved landfill or specialty recycling centers for glass products.
Environmental safety: Avoid direct disposal into natural waterways or sewage systems to prevent accumulation in sensitive habitats. If local regulations allow, can be treated as non-hazardous industrial waste.
Recycling opportunities: Clean, uncontaminated beads can return to industrial use, especially in abrasive or filler applications.
UN classification: Glass microspheres typically do not fall under hazardous materials for ground, air, or sea shipment.
Packing precautions: Minimize breakage and prevent dust generation during handling and transportation. Use sturdy, sealed containers.
Documentation: Shipments generally require basic product identification and weight, as these are not regulated as dangerous goods.
GHS classification: Not considered hazardous under most globally harmonized labeling criteria
Workplace standards: Exposure to nuisance dust should be managed according to regional health and safety guidelines. Some jurisdictions require product labeling if used in significant quantities.
Market restrictions: No universal prohibitions on the sale or handling of glass microspheres; some localities may restrict use in products intended for ingestion or medical applications if trace contaminants exceed norms.
