International Chemical Safety Cards

FLUOROSILICIC ACID ICSC: 1233
FLUOROSILICIC ACID
Hexafluorosilicic acid
Dihydrogen hexafluorosilicate
Fluosilicic acid
Hydrosilicofluoric acid
F6H2Si
Molecular mass: 144.1
CAS # 16961-83-4
RTECS # VV8225000
ICSC # 1233
UN # 1778
EC # 009-011-00-5

TYPES OF
HAZARD/
EXPOSURE
ACUTE HAZARDS/
SYMPTOMS
PREVENTION FIRST AID/
FIRE FIGHTING
FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.

In case of fire in the surroundings: all extinguishing agents allowed.
EXPLOSION


EXPOSURE
AVOID ALL CONTACT!
IN ALL CASES CONSULT A DOCTOR!
  • INHALATION
  • Corrosive. Burning sensation. Cough. Shortness of breath.
    Ventilation, local exhaust, or breathing protection.
    Fresh air, rest. Half-upright position. Refer for medical attention.
  • SKIN
  • Corrosive. Pain. Blisters.
    Protective gloves. Protective clothing.
    Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.
  • EYES
  • Corrosive. Redness. Pain. Severe deep burns.
    Face shield, or eye protection in combination with breathing protection.
    First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
  • INGESTION
  • Corrosive. Abdominal cramps. Burning sensation. Vomiting.
    Do not eat, drink, or smoke during work.
    Rinse mouth. Do NOT induce vomiting. Refer for medical attention.
    SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING
    Collect leaking and spilled liquid in sealable iron containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place (extra personal protection: complete protective clothing including self-contained breathing apparatus).
    Separated from strong bases, food and feedstuffs. Well closed.
    Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs.
    C symbol
    R: 34
    S: (1/2-)26-27-45
    UN Classification.
    UN Hazard Class: 8
    UN Packing Group: II
    SEE IMPORTANT INFORMATION ON BACK
    ICSC: 1233 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993

    International Chemical Safety Cards

    FLUOROSILICIC ACID ICSC: 1233

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    PHYSICAL STATE; APPEARANCE:
    FUMING COLOURLESS LIQUID , WITH PUNGENT ODOUR.

    PHYSICAL DANGERS:


    CHEMICAL DANGERS:
    The substance decomposes on heating or on burning producing toxic fumes of fluoride. The solution in water is a strong acid, it reacts violently with bases and is corrosive. Reacts with water or steam to produce toxic and corrosive fumes. Attacks glass and stoneware. This substance (anhydrous form) dissociates almost instantly into silicon tetrafluoride and corrosive and toxic hydrogen fluoride.

    OCCUPATIONAL EXPOSURE LIMITS (OELs):
    TLV (as F): ppm; 2.5 mg/m3 (as TWA) (ACGIH 1995-1996).


    ROUTES OF EXPOSURE:
    The substance can be absorbed into the body by inhalation of its aerosol and by ingestion.

    INHALATION RISK:
    No indication can be given about the rate in which a harmful concentration in the air is reached on evaporation of this substance at 20°C.

    EFFECTS OF SHORT-TERM EXPOSURE:
    Corrosive. The substance is corrosive to the eyes, the skin and the respiratory tract. Corrosive on ingestion. Inhalation of the vapour of this substance may cause lung oedema (see Notes). The effects may be delayed. Medical observation is indicated.

    EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
    The substance may have effects on the bones and teeth , resulting in fluorosis.
    PHYSICAL
    PROPERTIES
    Boiling point: decomposes°C
    Melting point: see Notes°C
    Relative density (water = 1): see Notes
    Solubility in water: miscible
    ENVIRONMENTAL
    DATA

    N O T E S
    Marketed as aqueous solution only. Density of 61% solution at 25°C is 1.46, and density of 30% solution at 17.5°C is 1.27. 60-70% solution solidifies at about 19°C, forming a crystalline dihydrate. 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. Immediate administration of an appropriate spray, by a doctor or a person authorized by him/her, should be considered.
    ADDITIONAL INFORMATION


    ICSC: 1233 FLUOROSILICIC ACID
    © IPCS, CEC, 1993
    IMPORTANT LEGAL NOTICE: Neither the CEC or the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use.