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Physical Properties:

CAS Number: 1309-64-4
Appearance: White powder
Molecular Formula: Sb₂O₃
Molecular Weight: 291.50
Melting Point: 656°C
Boiling Point: 1425°C
Specific Gravity: 5.2
Solubility: Soluble in HCl and tartaric acid; insoluble in water and acetic acid.

Uses:

Serves as a flame retardant additive for materials such as polypropylene, polystyrene, polyvinyl chloride (PVC), nylon, engineering plastics (ABS), rubber, paints, coatings, synthetic resins, and paper.
Acts as a fining agent in polyester fibers to remove hidden air bubbles from molten glass.
Used as an opacifier and whitening agent in enamel and ceramic products.
Functions as a passivator in the catalytic cracking and catalytic reforming processes of petroleum and petroleum residues.

Grade and Specification

Item	Grade / Specification
Brand / Grade	Sb₂O₃ 99.90	Sb₂O₃ 99.80	Sb₂O₃ 99.50
	I	II	I	II
Chemical Composition (%)
Sb₂O₃, min	99.90	99.80	99.80	99.80	99.50
Impurities, max
As (Arsenic)	0.0100	0.0200	0.0300	0.0450	0.0450
Pb (Lead)	0.0100	0.0300	0.0400	0.0800	0.0900
Fe (Iron)	0.0010	0.0030	0.0050	0.0050	0.0060
Cu (Copper)	0.0010	0.0020	0.0025	0.0025	0.0025
Se (Selenium)	0.0010	0.0015	0.0040	0.0040	0.0050
Bi (Bismuth)	0.0010	0.0010	0.0030	0.0050	0.0050
Cd (Cadmium)	0.0005	0.0005	0.0010	0.0010	0.0010
Physical Properties
Whiteness, min	96	96	95	95	95
Average Particle Size (μm)	0.4-0.9	0.9-1.2	0.4-0.9	0.9-1.6	0.4-0.9 / 0.9-1.6 / 1.6-2.5
Transmittance in EG Solution (%), min	97	-	-	-	-
B* Color Value, max	1.2	-	-	-	-

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