Sodium borohydride is a white crystalline powder. Moisture absorption, decomposition in moist air, stable at 300 ° C dry air. Heated slowly to 400 ° C decomposition, emergency heat 500 ° C begins to decompose. Solubility (g/100g): 88.5 of 55, 60 ℃ in water at 25 ° C, liquid ammonia at 25 ° C 104, ethylenediamine 75 ° C, 22, morpholine 25 ° C 1.4, pyridine 25 ° C 3.1, methanol 20 ° C 16.4 (react) ethanol at 20 ° C 4.0 (slow response), tetrahydrofurfuryl alcohol at 20 ° C 0.1, diethylene glycol dimethyl ether 25 ° C 5.5 20 ° C dimethylformamide 18.0. Quite stable aqueous solution containing a small amount of sodium hydroxide can be stored for several days, the rapid decomposition of aqueous solution boiling. Its relative density is 1.074.Beacuse water, moist air, acids, oxidizers, heat and open flame can cause a fire with it, it should be stored in a cool dry place, away from fire, heat. Sodium borohydride is strongly irritates mucous membranes and upper respiratory tract, eyes and skin. After inhalation may be due to spasm, inflammation and edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema and death. Oral corrosion of the digestive tract.
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