Product Identification

Product Name

Trimethyl borate

Synonyms

Boric acid, trimethyl ester
Methyl borate
Trimethoxyborane
Trimethylborate

CAS

121-43-7

Formula

C3H9BO3

Molecular Weight

103.91

EINECS

204-468-9

RTECS

ED5600000

RTECS Class

Primary Irritant

Merck

12,9842

Beilstein/Gmelin

1697939

Beilstein Reference

4-01-00-01269

EC Index Number

005-005-00-1

EC Class

Flammable; Harmful

Physical and Chemical Properties

Appearance

Water-white liquid.

Solubility in water

Decomposes

Melting Point

-34 - -29

Boiling Point

67

Vapor Pressure

137 (25 C)

Density

0.915 g/cm3 (20 C)

Partition Coefficient

1.45

Heat Of Vaporization

29.7 kJ/mol

Usage

As solvent for waxes, resins, oils, catalyst in manufacture of ketones, analysis of paintermediate & varnish ingredients, as neutron detector gas in presence of a scintillation counter, as promotor of diborane reactions.

Vapor Density

3.6

Refractive Index

1.3576

First Aid Measures

Ingestion

Get medical aid. Wash mouth out with water.

Inhalation

Remove from exposure to fresh air immediately. Get medical aid if cough or other symptoms appear.

Skin

Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Handling and Storage

Storage

Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Keep under a nitrogen blanket. Flammables-area.

Handling

Use spark-proof tools and explosion proof equipment. Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.

Hazards Identification

Inhalation

May cause respiratory tract irritation.

Skin

May cause skin irritation. Harmful if absorbed through the skin.

Eyes

May cause eye irritation.

Ingestion

Causes gastrointestinal irritation with nausea, vomiting and diarrhea.

Hazards

Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

EC Risk Phrase

R 11 21

EC Safety Phrase

S 23 25

UN (DOT)

2416

Exposure Controls/Personal Protection

Personal Protection

Eyes: Wear chemical goggles. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear a chemical apron.

Respirators

Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Exposure Effects

Significant ingestions or dermal exposures can be associated with weak, rapid pulse, cyanosis and abnormally low blood pressure. The patient may present with reduced body temperature, elevated body temperature or normal body temperature. Headache, lethargy, restlessness, weakness, CNS irritation, and/or seizures may occur with long term or repeated exposures. There is insufficient information concerning the reproductive effects of borates in humans. Adverse testicular effects and infertility have been reported in animals. <br>There have been limited animal studies which suggest decreased ovulation, fetotoxicity and developmental defects may occur with very high exposure levels. Maternal toxicity was present in some studies.

Poison Class

5

Fire Fighting Measures

Flash Point

-11

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Will burn if involved in a fire. Containers may explode in the heat of a fire. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. For large fires, use water spray, fog, or alcohol-resistant foam. Do NOT use dry chemical.

Fire Potential

HIGHLY FLAMMABLE.

Accidental Release Measures

Small spills/leaks

Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition.

Stability and Reactivity

Disposal Code

3

Incompatibilities

Oxidizing agents, strong acids, moist air or water.

Stability

Stable under normal temperatures and pressures.

Decomposition

Carbon monoxide, carbon dioxide, oxides of boron.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

2416

Hazard Class

3

Packing Group

II

HS Code

2920 90 85