|
| | Ammonium hexafluorosilicate Basic information |
| | Ammonium hexafluorosilicate Chemical Properties |
| Melting point | °Cd ec.) | | density | 2.01 g/mL at 25 °C(lit.) | | vapor pressure | 9.99Pa at 20℃ | | solubility | water solubility 18 g/100 g water. | | form | Crystalline Powder and Chunks | | Specific Gravity | 2.011 | | color | White | | Water Solubility | Slightly soluble in water. Insoluble in alcohol and acetone. | | Hydrolytic Sensitivity | 0: forms stable aqueous solutions | | Merck | 14,527 | | Exposure limits | ACGIH: TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 | | LogP | -6.01 at 20℃ | | CAS DataBase Reference | 16919-19-0(CAS DataBase Reference) | | EPA Substance Registry System | Ammonium silicofluoride (16919-19-0) |
| Hazard Codes | T | | Risk Statements | 23/24/25 | | Safety Statements | 26-45 | | RIDADR | UN 2854 6.1/PG 3 | | WGK Germany | 2 | | RTECS | VV7800000 | | Hazard Note | Toxic | | TSCA | Yes | | HazardClass | 6.1 | | PackingGroup | III | | HS Code | 2826908090 | | Hazardous Substances Data | 16919-19-0(Hazardous Substances Data) | | Toxicity | LD orally in guinea pigs: 150 mg/kg (Simonin, Pierron) |
| | Ammonium hexafluorosilicate Usage And Synthesis |
| Chemical Properties | white slightly adhering crystalline powder | | Chemical Properties | Ammonium hexafluorosilicate is a white crystalline
powder. Odorless. | | Physical properties | d 2.01 g cm?3; decomposes prior to melting;
odorless. | | Uses | Ammonium hexafluorosilicate is used as a disinfectant and analytical reagent. It finds application in etching glass, metal casting, and electroplating. It is also employed as a wood preservative agent and mothproofing agent in textiles. It plays a useful application in soldering flux. It is also used to arrest caries treatment without discoloration on demineralized primary tooth enamel. | | Uses | In pesticides; in soldering flux; etching glass. | | General Description | A white crystalline solid. Noncombustible. Corrodes aluminum. Used as a disinfectant, in etching glass, metal casting, and electroplating. | | Air & Water Reactions | Water soluble. | | Reactivity Profile | Salts, basic, such as Ammonium hexafluorosilicate, are generally soluble in water. The resulting solutions contain moderate concentrations of hydroxide ions and have pH's greater than 7.0. They react as bases to neutralize acids. These neutralizations generate heat, but less or far less than is generated by neutralization of the bases in reactivity group 10 (Bases) and the neutralization of amines. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible. | | Hazard | Very toxic; fatal. | | Health Hazard | Inhalation of dust can cause pulmonary irritation and can be fatal in some cases. Ingestion may be fatal. Contact with dust causes irritation of eyes and irritation or ulceration of skin. | | Fire Hazard | Special Hazards of Combustion Products: Toxic and irritating hydrogen fluoride, silicon tetrafluoride, and oxides of nitrogen may form in fires. | | Flammability and Explosibility | Notclassified | | Potential Exposure | This material is used as a pesticide
and miticide, wood preservative, soldering flux; light metal
casting; and in the etching of glass. | | Shipping | UN2856 Fluorosilicates, n.o.s., Hazard Class:
6.1; Labels: 6.1-Poisonous materials, Technical Name
Required. | | Purification Methods | Crystallise the salt from water (2mL/g). After 3 recrystallisations, the Technical grade salt has Li, Na, K and Fe at 0.3, 0.2, 0.1 and 1.0 ppm respectively. | | Incompatibilities | Aqueous solution is highly corrosive.
Contact with acids reacts to form hydrogen fluoride,
which is a highly corrosive and forms a toxic gas.
Corrosive to aluminum. Incompatible with oxidizers (chlorates,
nitrates, peroxides, permanganates, perchlorates,
chlorine, bromine, fluorine, etc.); contact may cause fires
or explosions. Keep away from alkaline materials, strong
bases, strong acids, oxoacids, epoxides. Ammonium fluorosilicate
reacts with water to form
hydrofluoric acid, a source of fluoride ions. Unlike other
halide ions, the fluoride ion is highly reactive, acting as a
weak base and participating in some unique reactions. In
particular, fluorides react strongly with compounds containing
calcium, magnesium, or silicon ions, which means
that solutions containing soluble fluorides are corrosive to
both living tissue and glass. Hydrofluoric acid can cause
severe chemical burns and is one of the few materials that
can etch glass. It is also a toxic gas in its anhydrous
form. | | Waste Disposal | Consult with environmental
regulatory agencies for guidance on acceptable disposal
practices. Generators of waste containing this contaminant
(≥100 kg/mo) must conform with EPA regulations governing
storage, transportation, treatment, and waste disposal.
Incineration. |
| | Ammonium hexafluorosilicate Preparation Products And Raw materials |
|
