Trimethyl borate

  • TrimethylborateBoric acid, trimethyl ester
  • Methyl borate
  • Boric acid, trimethyl ester
Formula
(CH3O)3B
Structure
Description
Water-white liquid.
Uses
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.

Registry Numbers and Inventories.
CAS
121-43-7
EC (EINECS/ELINCS)
204-468-9
EC Index Number
005-005-00-1
EC Class
Flammable; Harmful
R 11 21
RTECS
ED5600000
RTECS class
Primary Irritant
UN (DOT)
2416
Merck
12,9842
Beilstein/Gmelin
1697939
Beilstein Reference
4-01-00-01269
Swiss Giftliste 1
G-1835
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C3H9BO3
Formula mass
103.91
Melting point, °C
-34 - -29
Boiling point, °C
67
Vapor pressure, mmHg
137 (25 C)
Vapor density (air=1)
3.6
Density
0.915 g/cm3 (20 C)
Solubility in water
Decomposes
Viscosity
0.36 cp (25 C)
Refractive index
1.3576
Partition coefficient, pKow
1.45
Heat of vaporization
29.7 kJ/mol

Hazards and Protection.
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.
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.
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.
Disposal code
3
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents, strong acids, moist air or water.
Decomposition
Carbon monoxide, carbon dioxide, oxides of boron.

Fire.
Flash Point,°C
-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.
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.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
1
 
Flammability
3
 
 
Reactivity
1
 

Health.
Poison_Class
5
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.
   Ingestion
Causes gastrointestinal irritation with nausea, vomiting and diarrhea.
   Inhalation
May cause respiratory tract irritation.
   Skin
May cause skin irritation. Harmful if absorbed through the skin.
   Eyes
May cause eye irritation.

First aid
 
   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.

Transport.
UN number
2416
Response guide
Hazard class
3
Packing Group
II
 
HS Code
2920 90 85
 
Std. Transport #
4910586