Sodium borohydride

  • Sodium tetrahydroborate
Formula
NaBH4
Structure
Description
Sodium borohydride is a white to grayish crystalline powder.
Uses
Reducing agent for aldehydes, ketones & schiff bases in nonaqueous solvents, reduces acids, esters, acid chlorides, disulfides, nitriles, & inorg anions, as scavenger for traces of aldehyde, ketones & peroxides in organic chemicals, as foaming agent, to generate diborane.

Registry Numbers and Inventories.
CAS
16940-66-2
EC (EINECS/ELINCS)
241-004-4
EC Class
highly flammable, toxic, corrosive
R 15 25 34
S 26 36/37/39 43 45
RTECS
ED3325000
RTECS class
Other
UN (DOT)
1426
Merck
12,8735
Beilstein/Gmelin
23167 (G)
Swiss Giftliste 1
G-9541
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
BH4Na
Formula mass
37.83
Melting point, °C
400
Vapor density (air=1)
1.3
Odor Threshold Odor threshold Odorless
Density
1.04 g/cm3 (25 C)
Solubility in water
Soluble

Hazards and Protection.
Storage
Keep from contact with oxidizing materials. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep away from water. Store protected from moisture.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Do not allow water to get into the container because of violent reaction. Minimize dust generation and accumulation. Keep container tightly closed. Do not get on skin or in eyes. Do not ingest or inhale. Do not allow contact with water. Keep from contact with moist air and steam.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
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
Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation. Do not expose spill to water. Do not get water inside containers.
Disposal code
26
Stability
Stable under normal shipping and handling conditions. However, may decompose if heated. May decompose on exposure to moist air or water. Combines vigorously or explosively with water.
Incompatibilities
Acids, methanoic acid, oxalic acid), alcohols and glycols (e.g. butyl alcohol, ethanol, methanol, ethylene glycol), aldehydes (e.g. acetaldehyde, acrolein, chloral hydrate, formaldehyde), amides (e.g. butyramide, diethyltoluamide, dimethyl formamide), amines (aliphatic and aromatic, e.g. dimethyl amine, propylamine, pyridine, triethylamine), azo, diazo, and hydrazines (e.g. dimethyl hydrazine, hydrazine, methyl hydrazine), carbamates (e.g. carbanolate, carbofuran), caustics, cyanides (e.g. potassium cyanide, sodium cyanide), dithiocarbamates (e.g. ferbam, maneb, metham, thiram), esters (e.g. butyl aceta
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, oxides of boron, borane, hydrogen gas.

Fire.
Flash Point,°C
69
Autoignition, °C
220
Lower exp. limit, %
3.0
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. Combustion generates toxic fumes. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Water Reactive. Material will react with water and may release a flammable and/or toxic gas. Use water spray to keep fire-exposed containers cool. May ignite or explode on contact with steam or moist air. Containers may explode when heated. Extinguishing media: DO NOT USE WATER! Do NOT get water inside containers. Contact professional fire-fighters immediately. Cool containers with flooding quantities of water until well after fire is out. For small fires use dry chemical, soda ash, lime or sand. For large fires use dry sand, dry chemical, soda ash or lime or withdraw from area and let fire burn.
Fire potential
Moderate fire hazard, when exposed to heat or flame or by chemical reaction with oxidizers. Burns quietly in air supports combustion
Hazards
Decomposes and produces highly flammable hydrogen gas.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
2
 
Flammability
1
 
 
Reactivity
2
 
 
Special
W

Health.
Poison_Class
3
Exposure effects
Prolonged or repeated skin contact may cause defatting and dermatitis. May cause lung damage.
   Ingestion
May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns.
   Inhalation
Irritation may lead to chemical pneumonitis and pulmonary edema. Causes severe irritation of upper respiratory tract with coughing, burns, breathing difficulty, and possible coma. May cause lung damage.
   Skin
May be absorbed through the skin. May cause severe skin irritation with possible burns, especially if skin is wet or moist.
   Eyes
May cause irreversible eye injury. When substances becomes wet or comes in contact with moisture of the mucous membranes, it will cause burns.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Discard contaminated clothing in a manner which limits further exposure.
   Eyes
Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
1426
Response guide
Hazard class
4.3
Packing Group
I
 
USCG CHRIS Code
SBH
 
HS Code
2850 00 20
 
Std. Transport #
4916437