Sodium fluorosilicate

  • Sodium silicofluoride
  • Sodium hexafluorosilicate
  • Sodium fluosilicate
  • Disodium hexafluorosilicate
Formula
Na2SiF6
Structure
Description
Fine, white, odorless, powdered solid.
Uses
In enamels for china & porcelain, manufacture opal glass, insect exterminator & poison for rodents, mothproofing of woolens, vet: pediculicide.

Registry Numbers and Inventories.
CAS
16893-85-9
EC (EINECS/ELINCS)
240-934-8
EC Index Number
009-012-00-0
EC Class
Toxic
RTECS
VV8410000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Primary Irritant
UN (DOT)
2674
Merck
12,8769
Beilstein/Gmelin
17694 (G)
EPA OPP
75306
Swiss Giftliste 1
G-2325
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
F6Na2Si
Formula mass
188.05
Density
2.68 g/cm3 (20 C)
Solubility in water
Insoluble
Heat of fusion
36.3 kJ/mol

Hazards and Protection.
Storage
Keep tightly closed in a cool place in a tightly closed container.
Handling
Containers of this material may be hazardous when emptied. Since emptied containers retain product residues (vapor, liquid, and/or solid), all hazard precautions given in the data sheet must be observed.
Protection
Wear skin protection and self-contained breathing apparatus.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers.
Stability
Unstable, can react explosively with impurities highly reactive.
Incompatibilities
Acids, alkalies, excessive heat, silicon tetrafluoride.
Decomposition
When heated to decomposition it emits toxic fumes of hydrogen fluoride and na2o.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Use foam, dry chemical, or carbon dioxide. Keep run-off water out of sewers and water sources.
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
Decomposes at red heat
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
TLV: ppm; 2.5 mg/m3 as F (as TWA) (ACGIH 1994-1995).
Poison_Class
2
Exposure effects
Hyperactive reflexes, painful muscle spasms, weakness and tetanic contractures may be noted due to fluoride induced hypocalcemia. Prenatal fluoride supplementation (2.2 mg NaF or 1 mg fluoride daily) during the last two trimesters of pregnancy has been reported to be safe.
   Ingestion
Epigastric pain, nausea, dysphagia, salivation, hematemesis, and diarrhea may be noted. These effects may be delayed for several hours following exposure. Gi symptoms are noted when 3 to 5 mg/kg of fluoride are ingested.
   Inhalation
Respirations are first stimulated then depressed. Death is usually from respiratory paralysis. Following inhalation, coughing and choking may be noted.
   Skin
Urticaria and pruritus have been reported following exposure to fluoride.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Seek medical attention; administer gastric lavage with lime water, then give lime water or milk at frequent intervals.
   Inhalation
Move to fresh air.
   Skin
Flush with water; wash with soap and water.
   Eyes
Flush with water for at least 15 min.

Transport.
UN number
2674
Response guide
Hazard class
6.1
Packing Group
III
 
USCG CHRIS Code
SFR
 
Std. Transport #
4925222