Sodium hydride

24

23.998

231-587-3

1427

MICROCRYSTALLINE, WHITE TO BROWNISH-GRAY POWDER|SILVERY NEEDLES TURNING OFF-WHITE ON EXPOSURE TO AIR

28500090

0

0.00000

White to pale gray powder (moistened with oil)

0.92 g/cm³

800 °C (decomp)

Very high. (USCG, 1999)

185°C

INDEX OF REFRACTION: 1.470

Solubility in water: reaction.;soluble in molten sodium. Insoluble in ammonia, benzene,carbon tetrachloride, carbon disulfide and all organic solvents.

Store at RT.

Hydrogen is combustible when exposed to water or humid air

MODERATE WITH (ETHYLENE + MOISTURE), AIR, CHLORINE, FLUORINE, DIMETHYL SULFOXIDE, SULFUR DIOXIDE, WATER.

odorless

PARTICLE SIZE RANGE 5-50 MICRONS; STARTS TO DECOMP WITH EVOLUTION OF HYDROGEN @ ABOUT 225 °C

Highly flammable. Ignites or explodes in contact with air of high humidity [Bretherick 1979 p. 107]. Reacts violently with water producing a caustic solution (NaOH) and hydrogen (H2). Heat of reaction may ignite the hydrogen.

Metal Hydrides, Metal Alkyls, Metal Aryls, and Silanes

Highly Flammable

SODIUM HYDRIDE is a powerful reducing agent. Attacks SiO2 in glass. Ignites on contact with gaseous F2, Cl2, Br2, and I2 (the last at temperatures exceeding 100°C), especially in the presence of moisture, to form HF, HCl, HBr, and HI [Mellor 2:483 1946-47]. Reacts with sulfur to give Na2S and H2S [Bretherick 1979 p. 107]. Can react explosively with dimethyl sulfoxide [Chem. Eng. News 44(24):7 1966]. Reacts vigorously with acetylene, even at -60°C [Mellor 2:483 1946-47]. Spontaneously flammable in fluorine. Reaction with dimethylformamide, when heated, runs away [Chem. Eng. News, 1982, 60(28), 5]. Initiates a polymerization reaction in ethyl-2,2,3-trifluoropropionate such that the ester decomposed violently [Bretherick 5th ed. 1995]. Presence in the reaction of diethyl succinate and ethyl trifluoroacetate, has twice caused explosions [Chem. Brit., 1983, 19, 645].

I

4.3

UN 1427 4.3/PG 1

3

15-36-35-11

26-43-7/8-43A-24/25-7-60-22-45-37/39-16

WB3910000

F,C

The warehouse is ventilated at low temperature and dry; stored separately from oxidants, halogens and strong acids

It can explode when exposed to water or humid air

P223, P231+P232, P280, P335+P334, P370+P378, P402+P404, P501

H260

WILL REACT WITH WATER OR STEAM TO PRODUCE HEAT, SODIUM HYDROXIDE & HYDROGEN GAS...|REACTS VIOLENTLY WITH LOWER ALCOHOLS...|VIOLENTLY REACTIVE WITH STRONG OXIDIZERS.

FLAMMABLE. MAY EXPLODE ON CONTACT WITH WATER. Accidental contact with water used to extinguish surrounding fire will result in the release of hydrogen gas and possible explosion. (USCG, 1999)|Flammable - 3rd degree, Reactive - 2nd degree

|Danger|H260: In contact with water releases flammable gases which may ignite spontaneously [Danger Substances and mixtures which in contact with water, emit flammable gases]|P223, P231+P232, P280, P335+P334, P370+P378, P402+P404, and P501|H228 (12.16%): Flammable solid [Danger Flammable solids]|P210, P223, P231+P232, P240, P241, P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P335+P334, P363, P370+P378, P402+P404, P405, and P501|Aggregated GHS information provided by 370 companies from 7 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.|P223, P231+P232, P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P335+P334, P363, P370+P378, P402+P404, P405, and P501

Excerpt from ERG Guide 138 [Substances - Water-Reactive (Emitting Flammable Gases)]: As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. SPILL: Increase, in the downwind direction, as necessary, the isolation distance shown above. FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2016)

Excerpt from ERG Guide 138 [Substances - Water-Reactive (Emitting Flammable Gases)]: ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area). Do not touch or walk through spilled material. Stop leak if you can do it without risk. Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material. DO NOT GET WATER on spilled substance or inside containers. SMALL SPILL: Cover with DRY earth, DRY sand or other non-combustible material followed with plastic sheet to minimize spreading or contact with rain. Dike for later disposal; do not apply water unless directed to do so. POWDER SPILL: Cover powder spill with plastic sheet or tarp to minimize spreading and keep powder dry. DO NOT CLEAN-UP OR DISPOSE OF, EXCEPT UNDER SUPERVISION OF A SPECIALIST. (ERG, 2016)

Wear rubber overclothing (including gloves). (USCG, 1999)|Face shield; rubber gloves

...IGNITES SPONTANEOUSLY ON STANDING IN MOIST AIR.|ON HEATING OR IN CONTACT WITH MOISTURE OR ACIDS, AN EXOTHERMIC REACTION MAY BE SUFFICIENT TO CAUSE IGNITION.

CAN FORM DUST CLOUDS THAT MAY EXPLODE ON CONTACT WITH FLAME, HEAT, OR OXIDIZING MATERIALS.|MODERATE WITH (ETHYLENE + MOISTURE), AIR, CHLORINE, FLUORINE, DIMETHYL SULFOXIDE, SULFUR DIOXIDE, WATER.

DO NOT USE WATER, CARBON DIOXIDE, DRY CHEMICAL OR HALOGENATED EXTINGUISHING AGENTS. FIRES MAY BE SMOTHERED BY APPLYING A METAL COVER. DRY GRAPHITE OR GROUND DOLOMITE MAY ALSO BE USED TO SMOTHER FIRES IN SODIUM HYDRIDE.|Powdered limestone & nitrogen-propelled dry powder.

/GUIDE 138: SUBSTANCES - WATER-REACTIVE (Emitting Flammable Gases)/ Fire or Explosion: Produce flammable gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Runoff may create fire or explosion hazard.|/GUIDE 138: SUBSTANCES - WATER-REACTIVE (Emitting Flammable Gases)/ Health: Inhalation or contact with vapors, substance or decomposition products may cause severe injury or death. May produce corrosive solutions on contact with water. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control may cause pollution.|/GUIDE 138: SUBSTANCES - WATER-REACTIVE (Emitting Flammable Gases)/ Public Safety: CALL Emergency Response Telephone Number on Shipping Paper first. If Shipping Paper not available or no answer, refer to appropriate telephone number listed on the inside back cover. As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. Keep unauthorized personnel away. Stay upwind. Keep out of low areas. Ventilate the area before entry.|/GUIDE 138: SUBSTANCES - WATER-REACTIVE (Emitting Flammable Gases)/ Protective Clothing: Wear positive pressure self-contained breathing apparatus (SCBA). Wear chemical protective clothing that is specifically recommended by the manufacturer. It may provide little or no thermal protection. Structural firefighters' protective clothing provides limited protection in fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible.|For more DOT Emergency Guidelines (Complete) data for SODIUM HYDRIDE (8 total), please visit the HSDB record page.

No person may /transport,/ offer or accept a hazardous material for transportation in commerce unless that person is registered in conformance ... and the hazardous material is properly classed, described, packaged, marked, labeled, and in condition for shipment as required or authorized by ... /the hazardous materials regulations (49 CFR 171-177)./|The International Air Transport Association (IATA) Dangerous Goods Regulations are published by the IATA Dangerous Goods Board pursuant to IATA Resolutions 618 and 619 and constitute a manual of industry carrier regulations to be followed by all IATA Member airlines when transporting hazardous materials.|The International Maritime Dangerous Goods Code lays down basic principles for transporting hazardous chemicals. Detailed recommendations for individual substances and a number of recommendations for good practice are included in the classes dealing with such substances. A general index of technical names has also been compiled. This index should always be consulted when attempting to locate the appropriate procedures to be used when shipping any substance or article.

Severe skin irritant. Causes second- & third-degree burns on short contact & is very injurious to the eyes.

| 3 - Materials that, under emergency conditions, can cause serious or permanent injury.| 3 - Liquids and solids that can be ignited under almost all ambient temperature conditions. Materials produce hazardous atmospheres with air under almost all ambient temperatures or, though unaffected by ambient temperatures, are readily ignited under almost all conditions.| 2 - Materials that readily undergo violent chemical changes at elevated temperatures and pressures.|W - No water: Materials that react violently or explosively with water.

SOLID: Will burn skin and eyes. Harmful if swallowed. (USCG, 1999)

INGESTION: do NOT induce vomiting; neutralize alkali in stomach by drinking dilute vinegar, lemon juice, or orange juice; call a physician. SKIN CONTACT: brush off all particles at once and flood the affected area with water. (USCG, 1999)

HIGHLY CORROSIVE ON INHALATION, INGESTION, OR CONTACT WITH SKIN.|HIGH. HIGH= CAPABLE OF CAUSING DEATH OR PERMANENT INJURY DUE TO EXPOSURES OF NORMAL USE; INCAPACITATING & POISONOUS; REQUIRES SPECIAL HANDLING.

sodium hydride

SOMETIMES FURNISHED AS A FINELY GROUND SLURRY IN OIL CONTAINING 25 TO 50% SODIUM HYDRIDE.|Commerical product, after filtration, is a 55% /oil/ dispersion of NaH crystals|/Available/ dispersion in industrial white oil at 60% concentration grades

All other basic inorganic chemical manufacturing|Sodium hydride (NaH): ACTIVE|ONE VARIATION OF MOLTEN CAUSTIC CLEANING IS THE SODIUM HYDRIDE DESCALING PROCESS, IN WHICH NO CURRENT IS USED & SODIUM HYDRIDE IS FED CONTINUALLY TO THE BATH THROUGH THE ACTION OF METALLIC SODIUM IN ORDER TO OBTAIN THE SCALE REDUCTION REQUIRED.

Fire Hazards -> Flammable - 3rd degree, Reactive - 2nd degree