Cryolite

Description

Cryolite · CAS 15096-52-3 · AlF6.3Na. UNII 5ZIS914RQ9. Melting Point: 1832 °F (NIOSH, 2024); Melting Point: 960-1027 °C; Melting Point: 1009 °C.

Identification

CAS Registry Number	15096-52-3
PubChem CID	16693908
Molecular formula	AlF6.3Na
IUPAC name	trisodium;hexafluoroaluminum(3-)
UNII (FDA)	5ZIS914RQ9

Computed Descriptors

Molecular Weight	209.941265
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	7
Rotatable Bond Count	0
Exact Mass	209.9412652
Monoisotopic Mass	209.9412652
Topological Polar Surface Area	0
Heavy Atom Count	10
Formal Charge	0
Complexity	62.7

Physical & Chemical Properties

Melting Point	1832 °F (NIOSH, 2024)
Melting Point	960-1027 °C
Melting Point	1009 °C
Melting Point	1832 °F
Solubility	0.04 % (NIOSH, 2024)
Solubility	0.04%
Density	2.95 g/cu cm
Density	2.95 g/cm³
Density	2.90
Vapor Pressure	0 mmHg (approx) (NIOSH, 2024)

Physical description & handling notes

• Large Crystals; CBI; Dry Powder; Other Solid
• Colorless to white (but may also be other colors) solid; [CHEMINFO]
• CRYSTALS OR AMORPHOUS POWDER.
• Colorless to dark odorless solid. [pesticide] [Note: Loses color on heating.]
• MONOCLINIC CRYSTALS (NATURAL PRODUCT); AMORPHOUS POWDER (SYNTHETIC PRODUCT)
• Snow-white, semi-opaque masses, vitreous fracture. Monoclinic crystals with cubic habit, perfect cleavage. The natural form may be colored reddish or brown or even black, but loses this discoloration on heating.

GHS Hazard Classification

Reported hazard statements	H332, H372, H411, H412

Documented Uses

• Used as an electrolyte in the production of aluminum by electrolytic reduction; [ACGIH]
• Aluminum Producing [Category: Industry]
• Primarily a stomach poison. ... For use against Lepidoptera & Coleoptera on certain vegetables & fruit crops ... .
• Principally an electrolyte in production and refining of aluminum; flux in production of various metals and alloys; flux and opacifier in manufacture of glass and enamels; coating for welding rods; filler for resin, rubber, ceramic-bonded grinding wheels
• Electrolyte in the reduction of alumina to aluminum; ceramics; insecticide; binder for abrasives; electric insulation; explosives & polishes.
• For more Uses (Complete) data for ALUMINUM SODIUM FLUORIDE (9 total), please visit the HSDB record page.

Synonyms

CRYOLITE; 15096-52-3; Cryolite (Na3(AlF6)); Cryocide; Kryocide; Kryolith; ICE Spar; Cryolite (AlNa3F6); Sodium aluminum fluoride; PROKIL CRYOLITE-96; 5ZIS914RQ9; Cryodust; Icetone; Kriolit; Greenland spar; RefChem:919221

Frequently Asked Questions

What are the CAS number and molecular formula of Cryolite?

CAS 15096-52-3; molecular formula AlF6.3Na; molecular weight — g/mol.

What other names is Cryolite known by?

CRYOLITE, 15096-52-3, Cryolite (Na3(AlF6)), Cryocide, Kryocide, Kryolith.

Is Cryolite classified as hazardous?

Hazard statements reported: H332, H372, H411, H412.

What are the key physical properties of Cryolite?

Melting Point: 1832 °F (NIOSH, 2024); Melting Point: 960-1027 °C; Melting Point: 1009 °C; Melting Point: 1832 °F.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.