Trimethyl Borate (TMB)

Colorless, highly flammable liquid that hydrolyzes in presence of water to methanol and boric acid.

CAS No: 121-43-7

We supply both Fresh and Recovered grades based on your requirements

Formula

C₃H₉B0₃

Main Uses

Solvent for waxes, oils, resins

Appearance

Colorless liquid

Handling

Avoid inhalation, skin and eye contact

Request a Quote

Safety Highlights

Summarizes Trimethyl Borate’s hazard classification, key flammability and toxicity concerns, storage requirements, PPE needs, emergency measures, and environmental precautions in a concise, user-friendly format.

Flammable Liquid

Highly flammable liquid and vapor (GHS Category 2, H225); vapors can travel to ignition sources and flash back.

Toxic on Contact

Harmful if swallowed (H302) or in contact with skin (H312); can cause respiratory irritation (H335) and CNS effects such as drowsiness or dizziness (H336).

Corrosive Agent

Not classified as corrosive to skin or metals but causes eye irritation (H320).

Emergency Measures

Irrigate with water for at least 15 minutes; remove contact lenses if easy; seek medical help if irritation continues.

Proper Storage

Store in a cool, dry, well-ventilated flammable-liquid storage area, tightly sealed, and protected from moisture to prevent hydrolysis to methanol and boric acid.

Regulatory ID

Formula: C₃H₉BO₃ | GHS Classification: Flammable Liquid Cat. 2 (H225), Acute Oral/Dermal Toxicity Cat.

Environmental Care

Prevent discharge into waterways; hydrolysis products (methanol, boric acid) are environmentally hazardous in sufficient concentrations. Notify authorities if contamination occurs.

PPE Required

Safety goggles/face shield, chemical-resistant gloves (neoprene/PVC), protective clothing, and respiratory protection if ventilation is inadequate.

Frequently Asked Questions

Provides quick-reference guidance on TMB’s flammability, health hazards, hydrolysis products, required PPE, and spill response to support safe handling and emergency preparedness.

What happens if Trimethyl Borate gets on skin or in eyes?

Immediate flushing with water is required. Skin contact: remove contaminated clothing and wash thoroughly; eye contact: irrigate for several minutes and seek medical attention if irritation persists.

Is Trimethyl Borate flammable?

Yes. It is a highly flammable liquid and vapor (Category 2). Vapors can travel and ignite at distant sources. Keep away from heat, sparks, open flames, and static.

Does it break down into anything hazardous?

Yes. In the presence of water it hydrolyzes to methanol (toxic, can cause CNS depression and visual disturbances at high exposure) and boric acid (can cause gastrointestinal and systemic effects in significant doses).

What personal protective equipment should be used?

Use safety goggles or face shield, chemical-resistant gloves, protective clothing, and, if needed, respiratory protection. Ground and bond containers to prevent static-induced ignition.

How should a spill be handled?

Evacuate and ventilate the area, eliminate ignition sources, contain the spill with inert absorbent, collect into labeled flammable waste containers using non-sparking tools, and prevent entry into drains. Decontaminate equipment and launder clothing after cleanup.

Need Bulk Pharma Solutions? Let’s Talk