FLUOROSILICIC ACID 1233
October 2004
Hexafluorosilicic acid
CAS No: 16961-83-4
Dihydrogen hexafluorosilicate
RTECS No: VV8225000
Fluosilicic acid
UN No: 1778
Hydrosilicofluoric acid
EC No: 009-011-00-5
F6H2Si / H2SiF6
Molecular mass: 144.1
TYPES OF
ACUTE HAZARDS/SYMPTOMS PREVENTION FIRST AID/FIRE FIGHTING
HAZARD/
EXPOSURE
Not combustible. Gives off irritating In case of fire in the surroundings:
FIRE
or toxic fumes (or gases) in a fire. use appropriate extinguishing
media.
EXPLOSION
EXPOSURE AVOID ALL CONTACT! IN ALL CASES CONSULT A
DOCTOR!
Burning sensation. Cough. Ventilation, local exhaust, or Fresh air, rest. Half-upright position.
Inhalation
Laboured breathing. Shortness of breathing protection. Refer for medical attention.
breath. Symptoms may be delayed
(see Notes).
Redness. Pain. Skin burns. Protective gloves. Protective Remove contaminated clothes.
Skin
clothing. Rinse skin with plenty of water or
shower. Immediately refer for
medical attention.
Redness. Pain. Severe deep Face shield or eye protection in First rinse with plenty of water for
Eyes
burns. combination with breathing several minutes (remove contact
protection. lenses if easily possible), then take
to a doctor.
Burning sensation. Abdominal Do not eat, drink, or smoke during Rinse mouth. Do NOT induce
Ingestion
cramps. Vomiting. Shock or work. vomiting. Give plenty of water to
collapse. drink. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Personal protection: complete protective clothing C Symbol Unbreakable packaging; put
including self-contained breathing apparatus. Collect R: 34 breakable packaging into closed
leaking and spilled liquid in sealable iron containers S: (1/2-)26-27-45 unbreakable container. Do not
as far as possible. Absorb remaining liquid in sand Note: B transport with food and feedstuffs.
or inert absorbent and remove to safe place Do NOT UN Hazard Class: 8
let this chemical enter the environment. UN Pack Group: II
EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-80S1778 and Separated from strong bases, food and feedstuffs. Well closed.
80GC1-II+III
IPCS Prepared in the context of cooperation between the International
Programme on Chemical Safety and the European Commission 漏
International IPCS 2005
Programme on
Chemical Safety SEE IMPORTANT INFORMATION ON THE BACK.
1233 FLUOROSILICIC ACID
IMPORTANT DATA
Physical State; Appearance Routes of exposure
FUMING COLOURLESS LIQUID, WITH PUNGENT ODOUR. The substance can be absorbed into the body by inhalation of
its aerosol and by ingestion.
Chemical dangers
Inhalation risk
The substance decomposes on heating producing toxic fumes
including hydrogen fluoride. The solution in water is a strong No indication can be given about the rate in which a harmful
acid, it reacts violently with bases and is corrosive. Reacts with concentration in the air is reached on evaporation of this
water or steam to produce toxic and corrosive fumes. Attacks substance at 20/C.
glass and stoneware. Attacks many metals forming
flammable/explosive gas (hydrogen - see ICSC 0001). This Effects of short-term exposure
substance (anhydrous form) dissociates almost instantly into The substance is corrosive to the eyes, the skin and the
silicon tetrafluoride and corrosive and toxic hydrogen fluoride. respiratory tract. Corrosive on ingestion. Inhalation of the vapour
of this substance may cause lung oedema (see Notes). The
Occupational exposure limits effects may be delayed. Medical observation is indicated. See
TLV: (as F) 2.5 mg/m3 as TWA; A4 (not classifiable as a human Notes.
carcinogen); BEI issued; (ACGIH 2004).
MAK not established. Effects of long-term or repeated exposure
The substance may have effects on the bones and teeth,
resulting in fluorosis.
PHYSICAL PROPERTIES
Decomposes below boiling point Solubility in water: miscible
Melting point: see Notes Vapour pressure, kPa at 20/C: see Notes
Relative density (water = 1): see Notes
ENVIRONMENTAL DATA
This substance may be hazardous in the environment; special attention should be given to aquatic organisms.
NOTES
Marketed only as aqueous solution. Solidification point for 60-70% solution: solidifies at about 19/C, forming a crystalline dihydrate.
Melting point for 35% solution: <-30/C.
Relative density for a 61% solution is 1.46 and for 35% solution is 1.38. Vapour pressure for a 35% solution is about 3 kPa.
The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical
effort. Rest and medical observation are therefore essential.
Temperature of decomposition unknown in literature.
Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered.
Card has been partly updated in April 2005. See sections Occupational Exposure Limits, EU classification,.
ADDITIONAL INFORMATION
Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible
LEGAL NOTICE
漏IPCS 2005
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