| Identification | More | [Name]
Potassium fluorosilicate | [CAS]
16871-90-2 | [Synonyms]
POTASSIUM FLUOROSILICATE
POTASSIUM HEXAFLUOROSILICATE
POTASSIUM SILICOFLUORIDE
dipotassiumhexafluorosilicate(2-)
hexafluoro-silicate(2-dipotassium
potassiumfluosilicate
Silicate(2-),hexafluoro-,dipotassium
dipotassium hexafluorosilicate
POTASSIUM SILICAFLUORIDE
POTASSIUM FLUOROSILICATE 95% MIN
POTASSIUM HEXAFLUOROSILICATE POWDER
Potassiumhexafluorosilicate,99%
Potassium hexafluorosilicate 98%
Potassiumhexafluorosilicate98%
Kaliumhexafluorsilikat
Potassium hexafluorosilicate, 99.999% (metals basis)
Dipotassium hexafluorosilicate (a little fluorine)
potassium flurosilicate | [EINECS(EC#)]
240-896-2 | [Molecular Formula]
F6K2Si | [MDL Number]
MFCD00040666 | [Molecular Weight]
220.27 | [MOL File]
16871-90-2.mol |
| Chemical Properties | Back Directory | [Appearance]
White, odorless, crystalline powder. D
3.0. Slightly soluble in water; soluble in hydrochlo-
ric acid.
| [Melting point ]
°Cd ec.) | [Boiling point ]
dec | [density ]
2.665 g/mL at 25 °C(lit.)
| [vapor pressure ]
0.01Pa | [refractive index ]
1.3991 | [solubility ]
insoluble in ethanol | [form ]
Powder | [color ]
White | [Specific Gravity]
2.665 | [Water Solubility ]
Slightly soluble in water. | [Hydrolytic Sensitivity]
0: forms stable aqueous solutions | [Sensitive ]
Moisture Sensitive | [Merck ]
14,7638 | [Solubility Product Constant (Ksp)]
pKsp: 6.06 | [Exposure limits]
ACGIH: TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3 | [LogP]
0.001 | [CAS DataBase Reference]
16871-90-2(CAS DataBase Reference) | [EPA Substance Registry System]
16871-90-2(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
T,Xi | [Risk Statements ]
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed . | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) . | [RIDADR ]
UN 2655 6.1/PG 3
| [WGK Germany ]
2
| [RTECS ]
VV8400000
| [F ]
21 | [Hazard Note ]
Irritant | [TSCA ]
Yes | [HazardClass ]
6.1 | [PackingGroup ]
III | [HS Code ]
2826908090 | [Safety Profile]
A poison by ingestion
and subcutaneous routes. Ingestion can
cause vomiting and dtarrhea. A strong
irritant. Incompatible with hydrofluoric acid.
When heated to decomposition it emits
toxic fumes of SiF4, K3SiF7, and KF. |
| Hazard Information | Back Directory | [General Description]
A white, odorless crystalline powder. Denser than water. Contact may cause irritation to skin, eyes, and mucous membranes. May be toxic by ingestion. Used to make other chemicals. | [Reactivity Profile]
POTASSIUM FLUOROSILICATE(16871-90-2) has weak oxidizing or reducing powers. Redox reactions can however still occur. The majority of compounds in this class are slightly soluble or insoluble in water. If soluble in water, then the solutions are usually neither strongly acidic nor strongly basic. These compounds are not water-reactive. | [Air & Water Reactions]
Slightly soluble in water. | [Hazard]
Toxic by ingestion and inhalation, strong
irritant to tissue.
| [Health Hazard]
Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution. | [Fire Hazard]
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Containers may explode when heated. Runoff may pollute waterways. | [Chemical Properties]
White, odorless, crystalline powder. D
3.0. Slightly soluble in water; soluble in hydrochlo-
ric acid.
| [Uses]
In the manufacture of opalescent glass, in porcelain enamels, in insecticides. Also used in aluminum metallurgy. | [Uses]
Potassium hexafluorosilicate is used in the production of porceleins. It is also used for the preservation of timber. It is involved in the manufacturing of ceramics, aluminum and magnesium smelting. In addition, it is used as an intermediate in the manufacturing of optical glass. | [Industrial uses]
Potassium fluorosilicate is a white to yellowish powder, poorly soluble in water (0.68%
at 20 °C). Because of its poor solubility, it is not commonly used as a modifying reagent.
| [Purification Methods]
Crystallise it several times from conductivity water (100mL/g) between 100o and 0o. |
| Questions And Answer | Back Directory | [Description]
As a type of fluorosilicate, potassium fluorosilicate can be used as fluoridizing agents for water supplies, in the production of synthetic cryolite, and in metal plating. Potassium fluorosilicate can be used as oral care ingredient, as a fluxing ingredient in porcelain enamels, and as wood preservative elements. Potassium fluorosilicate can also be used for the manufacture of ceramic materials and optical glasses.
| [References]
[1] W. John Williams, Handbook of Anion Determination, 1979
[2] Ruth Winter, A Consumer's Dictionary of Cosmetic Ingredients, 7th Edition, 2009
[3] B. A. Richardson, Wood Preservation, 2nd Edition, 1993
[4] Werner Vogel, Glass Chemistry, 2nd Edition, 1994
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