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Sodium Metaborate Tetrahydrate

Item	Details
CAS No.	10555-76-7
Molecular Formula	NaBO2·4H2O
Molecular Weight	137.86
Appearance	White transparent crystals or crystalline powder, free of impurity black spots, uniform crystal particles
Melting Point	57℃ (loses crystal water upon heating, gradually dehydrates to generate anhydrous sodium metaborate)
Solubility	Highly soluble in cold and hot water, aqueous solution weakly alkaline; slightly soluble in ethanol, insoluble in hydrocarbons, esters and other organic solvents
Stability	Stable under sealed and dry conditions at room temperature; dehydrates at high temperature; easily absorbs CO2 and water vapor from air to generate borax precipitate; do not store open for a long time
HS Code	2840190000 (Other borates)
Packing	Woven bag lined with PE inner film / plastic drum, standard specification: 25kg; outer package marked with moisture-proof and light-proof labels, general industrial packaging
Storage Conditions	Store in cool, dry and ventilated warehouse, ambient temperature ≤30℃, relative humidity ≤65% RH; seal to isolate air, carbon dioxide and acidic gas; do not mix with strong acids and acidic chemicals; use up quickly after opening, seal remaining materials for moisture protection
Personal Protection	Wear ordinary dust mask, rubber gloves and goggles during operation; avoid massive dust inhalation and prolonged skin contact; keep operation site ventilated
Waste Disposal	Neutralize alkaline waste liquid with acid to neutrality before discharge; recycle solid waste as general industrial solid waste; do not pour directly into natural water bodies
Application Fields	Industrial detergent / textile printing and dyeing auxiliary; metal surface treatment; paper industry; daily chemical washing raw material; ceramic and glass manufacturing; water treatment industry; organic synthesis and catalyst; agricultural auxiliary agent; building materials