Ammonium silicofluoride

  • Ammonium fluorosilicate
  • Ammonium hexafluorosilicate
Formula
(NH4)2SiF6
Structure
Description
Odorless to white crystalline powder.
Uses
In pesticides, mothproofing agents, and laundry souring agents. As a disinfectant in the brewing industry and as a glass echant. As a sand inhibitor in magnesium metal casting and as a soldering flux.

Registry Numbers and Inventories.
CAS
1309-32-6
RTECS
GQ9450000
RTECS class
Agricultural Chemical and Pesticide
UN (DOT)
2854
Beilstein/Gmelin
18191 (G)
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
F6H8N2Si
Formula mass
178.19
Density
2.011 g/cm3 (20 C)
Solubility in water
555 g/L
Refractive index
1.3682
Thermal expansion
0.000099/K

Hazards and Protection.
Storage
Transport or store away from strong acids. Transport or store in a dry place.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stability
Stable at normal temperatures and pressures.
Incompatibilities
Strong acids.
Decomposition
Toxic & irritating hydrogen fluoride gas.

Fire.
Fire fighting
Use method most appropriate to fight surrounding fire.
Fire potential
Non-Combustible
Hazards
Generation of hydrogen fluoride gas.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
TLV: 2.5 mg/m3 (as F)
Exposure effects
May cause musculo-skeletal effects. May cause skeletal abnormalities characteri- sed by calcification of ligaments and spine, stiff joints. Repeated or prolonged exposure may cause a rash to develop. May aggravate pre-existing respiratory diseases.
   Ingestion
Moderately toxic and slightly irritative.
   Inhalation
Toxic, may be fatal if inhaled, swallowed or absorbed through skin. Effects of contact or inhalation may be delayed.
   Skin
Avoid any skin contact. See Inhalation.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. Remove material from skin immediately. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
2854
Response guide
Hazard class
6.1
Packing Group
III
 
USCG CHRIS Code
ASL