Product Description:
Sodium pyroantimonate, with the general formula Na₂H₂Sb₂O₇·xH₂O (often simplified or represented as NaSbO₃ when anhydrous, though the pyroantimonate structure is more accurate for the hydrated form), is an inorganic sodium salt of antimonic acid. It typically appears as a white, fine crystalline powder that is sparingly soluble in cold water and more soluble in hot water. Sodium pyroantimonate is primarily recognized and utilized as a flame retardant synergist, particularly in combination with halogenated compounds in plastics and textiles. It also finds applications as a fining agent and opacifier in glass and ceramics manufacturing.
Product Properties:
Property Value Chemical Name
Sodium pyroantimonate
Common Synonyms
Sodium antimonate, Disodium dihydrogen pyroantimonate, Antimony sodium oxide
CAS Number
12507-68-5 (hydrated forms); 15432-85-6 (often cited for NaSbO₃)
General Formula
Na₂H₂Sb₂O₇·xH₂O (hydrated); NaSbO₃ (simplified anhydrous)
Molecular Weight
Varies with hydration (e.g., approx. 421.5 g/mol for Na₂H₂Sb₂O₇·H₂O)
Appearance
White, fine crystalline powder
Solubility
Sparingly soluble in cold water, more soluble in hot water; insoluble in alcohol
Key Characteristics
Flame retardant synergist, opacifier, fining agent
Primary Use
Flame retardants, glass and ceramics, catalysts
Product Usage:
Flame Retardants:
Plastics and Polymers: Used as a synergist with halogenated flame retardants (e.g., bromine or chlorine compounds) in various plastics like PVC, polyethylene, polypropylene, and ABS to enhance their fire resistance. For example, in wire and cable insulation or electronic housings.
Textiles and Coatings: Incorporated into flame-retardant treatments for fabrics (e.g., cotton, polyester blends) and in intumescent coatings.
Glass and Ceramics Manufacturing:
Fining Agent: Added to glass melts to remove bubbles and improve clarity by promoting the coalescence of small gas bubbles. For example, in the production of television screens or specialty optical glass.
Opacifier: Used to impart whiteness or opacity to glazes, enamels, and certain types of glass.
Catalysis:
Oxidation Catalyst: Employed as a catalyst or catalyst component in certain chemical oxidation processes.
Other Applications:
Pigments: Can be a component in some specialty pigments.
Analytical Reagent: Used in laboratories for the precipitation and detection of sodium ions (as potassium pyroantimonate is a common reagent for this purpose, sodium pyroantimonate itself is less common for detecting sodium but is a related compound).
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