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Sodium fluorosilicate Manufacturer/High quality/Best price/In stock
Cas No: 16893-85-9
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sodium hexafluorosilicate
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16893-85-9 Usage

Chemical Properties

white powder

General Description

Fine, white, odorless, powdered solid. Toxic by ingestion, inhalation and skin absorption. Used as a rodenticide.

Flammability and hazard characteristics

It is non-combustible with fire releasing toxic fluoride and sodium oxide, silica smoke; when it is reacted with acid, it can generate toxic hydrogen fluoride.

Chemical Properties

It appears as colorless hexagonal crystals. It is odorless and tasteless. It has hygroscopicity. It can be dissolved in a solvent such as ethyl ether but insoluble in alcohol with its solubility in acid is being greater than in the water.

Purification Methods

Crystallise it from hot water (40mL/g) by cooling.

Uses

In enamels for china and porcelain; manufacture of opal glass; as insecticide, rodenticide; mothproofing of woolens. Fluoridating agent for drinking water. Intermediate in production of synthetic cryolite.

Outline

Sodium fluorosilicate appears as white crystal, crystalline powder or colorless hexagonal crystals. It is odorless and tasteless. Its relative density is 2.68; it has moisture absorption capability. It can be dissolved in a solvent such as ethyl ether but insoluble in alcohol. The solubility in acid is greater than that in water. It can be decomposed in alkaline solution, generating sodium fluoride and silica. After searing (300 ℃), it is decomposed into sodium fluoride and silicon tetrafluoride. It is poisonous!
In 25 degrees, the sodium fluorosilicate has its water solubility being 0.78%. Upon production, addition of an excess amount of sodium sulfate or sodium chloride can increase the concentration of sodium ions in the system, thereby increasing the solubility product of fluorine silicate and sodium ions, so that sodium fluoride can be subject to more complete precipitation. Sodium fluorosilicate is the byproduct in the production of calcium phosphate or the production of fluoride salt in aluminum factory. It generally appears as a white crystalline powder with low solubility in water (being 1% or less at room temperature), and the water solubility increases slightly with increasing temperature. The aqueous solution of sodium fluorosilicate is acidic (pH3). This is due to that its hydrolysis product contains hydrofluoric acid. Reduction of the acidicity of the solution facilitates the hydrolysis of sodium fluorosilicate. When pH is lower than 3.5-3.55, the hydrolysis reaction is stabilized. When the pH is equal to 4, the hydrolysis reaction rate is significant. When the pH value is equal to 8-8.5, the sodium fluorosilicate can be completely hydrolyzed to exhibit as silica gel and precipitated out. Therefore, when sodium fluorosilicate is added to the water glass, in addition to hardening effect of precipitation of silicon dioxide gel caused by the neutralization of the sodium hydroxide in the solution of water glass, the sodium fluorosilicate itself is also a source of silica gel.

Reactivity Profile

Sodium fluorosilicate 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.

Fire extinguishing agent

plenty of water.

Fire Hazard

Behavior in Fire: Decomposes at red heat

Category

Toxic substances.

Data irritation

Skin-rabbit 500 mg Mild; Eyes-rabbit 100 mg/4 seconds Severe.

Air & Water Reactions

Water soluble.

Professional standards

TWA 2.5 mg (fluorine)/cubic meter.

Toxicity grading

Highly toxic.

Health Hazard

Inhalation of dust may irritate nose and throat. Ingestion causes symptoms similar to fluoride poisoning; compound is highly toxic; initial symptoms include nausea, cramps, vomiting, diarrhea, and dehydration; in severe cases, convulsions, shock, and cyanosis are followed by death in 2-4 hr. Contact with eyes causes irritation. Contact with skin causes rash, redness, and burning, sometimes followed by ulcer formation.

The role and purpose

Sodium fluorosilicate can be used as the insecticide in agriculture, the milky agent of enamel, the corrosion production agent of opal glass, wood preservatives and the raw material for the production of other kinds of fluoride as well as being applied to the smelting of beryllium and aluminum and pharmaceuticals, leather and rubber industry. In the refractory material, it can be used as the coagulant as the water glass binding agent. Since sodium fluorosilicate has a low water solubility, it reaction with the water glass is slow and gradual. This can not only boost the construction but also has a high density and strength of the cured products. It is most commonly used in the inorganic material binding with the water glass.
This information is edited by Xiongfeng Dai from Chemicalbook.

Acute toxicity

Oral-mouse LD50: 70 mg/kg.

Reference quality standards

105 ℃ Loss of weight upon drying% 0.17%
Sodium fluorosilicate (based on dry mass) 99.50
Free acid (calculated based on HCL) 0.0075
Water insoluble matter 0.12%
Heavy metals (Pb) content% <0.02
% Fineness (through 250um sieve) 98.00
Appearance white powder

Production method

Calcium superphosphate byproduct method: use sulfuric acid and ground phosphate rock for production of superphosphate or fluorine-containing waste gas during extraction of phosphate with water absorbing silicon tetrafluoride to make it into fluorosilicate. When the concentration of fluorine acid solution reaches 8% to 10%, stand static for clarification and remove the impurities with the clarified fluorine silicate solution being added of sodium chloride (being excess of about 25%) for reaction of sodium fluorosilicate. Further go through centrifugation isolation, washing, air drying at a temperature below 300 ℃ and then pulverize to obtain the finished product of sodium fluorosilicate.
H2SiF6 + 2NaCl → Na2SiF6 + 2HCl

Storage characteristics

Treasury: ventilation, low-temperature and drying; store it separately from food and acid.

Toxicity

This product is toxic with stimulation effect on the respiratory organ. People of mistakenly oral poisoning will get severe symptoms of damage to the gastrointestinal tract with the lethal dose being 0.4~4g. During the working of the operator, they should wear the necessary protective equipment to prevent poisoning. Production equipment should be sealed and the workshop should be well ventilated.
InChI:InChI=1/FO2Si.Na/c1-4(2)3;/q-1;+1

16893-85-9 Well-known Company Product Price

Brand (Code)Product description CAS number Packaging Price Detail
Aldrich (250171)  Sodiumhexafluorosilicate   16893-85-9 250171-2KG 1,063.53CNY Detail
Aldrich (250171)  Sodiumhexafluorosilicate   16893-85-9 250171-500G 462.15CNY Detail
Alfa Aesar (69106)  Sodium hexafluorosilicate, 99+%    16893-85-9 2kg 1097.0CNY Detail
Alfa Aesar (69106)  Sodium hexafluorosilicate, 99+%    16893-85-9 500g 453.0CNY Detail

16893-85-9SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017

1.Identification

1.1 GHS Product identifier

Product name sodium hexafluorosilicate

1.2 Other means of identification

Product number -
Other names Sodium hexafluorosilicate

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Agricultural chemicals (non-pesticidal),Bleaching agents
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:16893-85-9 SDS

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