Page 193 - Handbook of Hazardous Chemical Properties
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FLUOSILICIC ACID    183

                Physical and Chemical Properties - Physical State at 15  "c and 1 am.: Gas; Molecular Weight:
                37.99; Boiling Point at 1 m.: -306, -188, 85; Freezing Point: -362, -219, 54; Critical Temperature:
                -199.5, -128.6, -144.6; Critical Pressure: 809.7, 55.08, 5.58; Specific Gravity: 1.5 at -188, (liquid);
                Vapor (Gas) Specific Gravity: Not pertinent; Ratio of Specific Heats of Vapor (Gar) 1.362; Latent Heat
                                                                           :
                of Vaporization: 71.6, 39.8, 1.67; Heat of  Combustion: Not pertinent; Heat of Decomposition: Not
                pertinent.
                Health Hazards Information - Recommended Personal Protective Equipment: Tight-fitting chemical
                goggles, special clothing, not easily ignited by fluorine gas; Symptoms Following Exposure: Severe
                burning of eyes, skin and respiratory system. The burns may develop slowly after exposure; General
                Treafment for Exposure: Flush all affected parts with water for at least 15 min. Do not use ointments.
                Administer artificial respiration and oxygen if required; Toxicity by Inhalation (Threshold Limit Value):
                1 ppm; Short-Tern Inhalation Limits: 0.5 ppm for 5 min.; Toxicity by Ingestion: Not pertinent; Lute
                Toxicity:  Severe burns may develop slowly after exposure; Vapor (Gas) Im'tant Characteristics: Vapors
                cause severe irritation of eye and throat and can cause eye and lung injury. They cannot be tolerated
                even at low concentrations;  Liquid or Solid Imkmt Characteristics: Severe skin irritant. Causes second-
                and third-degree burns on short contact and is very injurious to the eyes; Odor l7ireshold 0.035 ppm.
                Fire Hazards - Flash Point  : Not flammable; Flammable Limits in Air  (%I): Not flammable; Fire
               Extinguishing Agents: Not pertinent; Fire Extinguishing Agents Not To Be Used: Do not direct water
                onto fluorine leaks; Special Hazards of Combustion Products: Toxic gases generated in fires involving
                fluorine; Behavior in Fire: Dangerously reactive gas. Ignites most combustibles; Ignition Temperature
                : Not flammable; Electrical Hazard: Not pertinent; Burning Rate: Not pertinent.
                Chemical Reactivity - Reactivity with Waer: Reacts with water to form hydrogen fluoride, oxygen and
                oxygen difluoride; Reactivity with Common Materials: Reacts violently with all combustible materials,
                except the metal cylinders in which it is shipped; Stability During  Transport: Stable; Neutralizing
               Agents  for  Acids  and  Caustics:  Not  pertinent;  Polymerization:  Not  pertinent;  Inhibitor  of
               Polymerization: Not pertinent.

               FLUOSILICIC ACID
                Chemical Designations - Synonyms: Fluorosilicic acid, Hexafluosilicic acid, Hydrofluosilicic acid,
                Hydrogen hexafluorosilicate, Sand acid, Silicofluoric acid; Chenical Fornula: H,SiF6-H,0.
               Observable Characteristics - Physical State (as shipped): Liquid; Color: Transparent, straw colored,
               colorless; Odor: Acrid, sharp.
               Physical and Chemical Properties - Physical State at 15  "c and  1 atm. : Liquid; Molecular Weight:
                144.09 (solute only); Boiling Point ut 1 am.: (water) -212, - 100, - 373; Freezing Point: (typical)
               -24 to -4, -31 to -20,242 to 253; Critical Temperature: Not pertinent; Critical Pressure: Not pertinent;
               Specific Gravity: (approx.) 1.3 at 25 "C, (liquid); Vapor (Gas) Specific Gravity: Not pertinent; Ratio
               of  Specipc Heats of Vapor (Gas): Not pertinent; Latent Heat of  Vaporizm'on: Not pertinent; Heat of
                Combustion: Not pertinent; Heat of Decomposition: Not pertinent.
               Health Hazards Information - Recommended Personal Protective Equipment: Rubber gloves, safety
               glasses, protective clothing; Symptoms Following Exposure: Inhalation of  vapor produces  severe
               corrosive effect on mucous membrane. Ingestion causes severe bums of mouth and stomach. Contact
               with  liquid  or  vapor  causes  severe burns  of  eyes  and  skin;  General  Treatment for  Exposure:
               INHALATION: remove victim to fresh air; get medical attention. INGESTION. give large amounts
               of water; do NOT induce vomiting. EYES: immediately wash with water for 15 min.; call physician.
               SKIN. wash affected parts with water; treat as for hydrogen fluoride burn with iced benzalkonium
               chloride soaks;  Toxicity by Inhalation  (Threshold Limit  Value): Data  not  available;  Short-Term
               Inhalation Limits:  Data not available; Toxicity by Ingestion: Data not available; Lute Toxicity: Data not
               available;  Vapor  (Gas) Im'tm  Characteristics: Data  not  available;  Liquid  or  Solid  Irritant
               Characteristics:  Data not available; Odor Threshold Data not available.
               Fire Hazards - Flash Point  : Not flammable; Flammable Limits in Air  (96):  Not flammable; Fire
               Extinguishing Agents: Not pertinent; Fire Extinguishing Agents Not To Be Used: Not pertinent; Special
               Hazards of Combustion Products: Irritating fumes of hydrogen fluoride may form in fires; Behavior
               in Fire: Not pertinent; Ignition Temperature : Not pertinent; Electrical Hazard: Not pertinent; Burning
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