Name: Trimethyl Borate
Chemical Formula: B(OCH3)3
Appearance: Clear, colorless liquid
Odor: Much like alcohol, often compared to an ether-like smell
Typical Uses: Used as a reagent in organic synthesis, for making boronic esters, and sometimes even as a flame retardant
CAS Number: 121-43-7
Flammable: Vapors catch fire easily, especially in poorly ventilated areas
Health Hazards: Exposure brings irritation to eyes, skin, and respiratory system; inhaled vapors may cause dizziness or headaches
Long-Term Risks: Prolonged exposure can hurt organs, like the liver and kidneys, if not handled with care
Environmental Dangers: Toxic to aquatic life, dangerous if spilled into waterways
Hazard Symbols: Flammable liquid symbol and exclamation mark for irritation
Main Component: Trimethyl Borate B(OCH3)3 typically over 99%
Other Constituents: Residual solvents if present are usually methanol, but should be kept to a minimum by reputable suppliers
Inhalation: Move to fresh air right away, keep calm, and seek medical attention if breathing problems start
Skin Contact: Rinse affected skin with plenty of water; soap helps clear any residue
Eye Contact: Flush eyes for at least 15 minutes and get immediate medical help if irritation sticks around
Ingestion: Do not try to induce vomiting; rinse mouth; see a doctor quickly
Suitable Extinguishing Media: Use dry chemical, foam, or carbon dioxide—water can make matters worse by spreading the liquid
Special Hazards: Vapors can form explosive mixtures with air, so ventilation matters; combustion may release toxic gases like boron oxides
Protective Equipment: Firefighters should wear full protective gear and self-contained breathing apparatus to avoid breathing in toxic fumes
Small Spills: Absorb with earth, sand, or another non-combustible material and ventilate the area well
Large Spills: Evacuate and contain spillage, avoid run-off into drains, and call specialized clean-up crews
Personal Precautions: Wear gloves and goggles, keep sources of ignition away, and use only non-sparking tools
Environmental Precautions: Prevent contamination of soil, groundwater, and sewers
Handling: Use only in chemical fume hoods or areas with plenty of ventilation
Storage Conditions: Store in tightly sealed containers away from heat, sparks, or open flames; the storage area needs grounding and bonding measures
Incompatibilities: Acids, oxidizers, and water can all cause hazardous reactions
Ventilation: Local exhaust or chemical fume hoods work best
Respiratory Protection: Use respirators if vapor concentrations climb; check cartridges for organics
Eye Protection: ANSI-approved goggles or face shields
Gloves: Chemical-resistant gloves, like nitrile, protect best
Clothing: Lab coats, sleeves, and closed shoes keep skin from exposure
Boiling Point: About 68 °C
Melting Point: Below -34 °C
Flash Point: Around 11 °C (closed cup)
Vapor Density: Heavier than air
Solubility: Reacts with water, forms boric acid and methanol
Density: Near 0.87 g/cm³ at room temperature
Vapor Pressure: Moderate at 20 °C
Stability: Keeps stable under dry, cool conditions
Hazardous Reactions: Exposure to water or moisture sets off hydrolysis, making methanol and boric acid
Incompatible Materials: Powerful oxidizing agents, acids, and—oddly—any kind of strong moisture sources
Decomposition Products: Methanol fumes and boron oxides in case of fire or breakdown
Acute Effects: Swift exposure irritates skin, eyes, and airways; higher doses cause drowsiness or headaches
Chronic Effects: Over-exposure, especially by inhaling vapors for long periods, can damage the nervous system, liver, and kidneys
Sensitization: Repeated skin contact sometimes brings allergic reactions
Noted Limits: OSHA and ACGIH have not set specific occupational exposure limits; caution and engineering controls remain key
Aquatic Toxicity: Dangerous to aquatic species, even at fairly low levels
Persistence: Spills break down to methanol and boric acid, both of which stick around and may harm water ecosystems
Bioaccumulation: Not expected to collect in animal tissues in high amounts, but environmental damage can start quickly after a spill
Methods: Let trained professionals handle; incinerate in facilities equipped to control hazardous air emissions
Small Quantities: Soak up with absorbent, put in special waste container, label clearly, and coordinate disposal with local hazardous waste services
Never pour down drains: Local sewer systems are not set up for these chemicals; keep them out of water supplies at all costs
Proper Shipping Name: Flammable liquid, n.o.s. (contains Trimethyl Borate)
Packing Group: II, meaning strong hazard
Hazard Class: 3—Flammable Liquids
Labels: Shipping cartons need bold flammable warnings
Precautions During Transport: Keep upright, strapped down in secure containers, and away from heat or open flames
Global Inventories: Listed on most chemical inventories, including US TSCA
Restrictions: Workplace limits focus on flammability and toxicity; personal protective equipment and ventilation remain legal requirements in most regions
Community Right-to-Know: Regulations in some countries force disclosure of use and storage quantities above certain thresholds
Safety Data: Further reporting or registration might be needed if used in consumer products or large-scale industry, especially in the US and Europe
