Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information
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Trimethyl borate(121-43-7)

Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information

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
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