Sodium fluorosilicate
Sodium silicofluoride
Disodium hexafluorosilicate
Na2SiF6
Molecular mass: 188.0
ICSC # 1243
CAS # 16893-85-9
RTECS # VV8410000
UN # 2674
EC # 009-012-00-0
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Not combustible.
Gives off irritating or toxic fumes (or gases) in a fire.
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In case of fire in the surroundings: use appropriate extinguishing media.
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Explosion
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Exposure
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PREVENT DISPERSION OF DUST!
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•Inhalation
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Burning sensation.
Cough.
Sore throat.
See Ingestion.
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Avoid inhalation of fine dust and mist.
Local exhaust or breathing protection.
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Fresh air, rest.
Refer for medical attention.
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•Skin
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Redness.
Pain.
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Protective gloves.
Protective clothing.
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Remove contaminated clothes.
Rinse skin with plenty of water or shower.
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•Eyes
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Redness.
Pain.
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Safety goggles
or
eye protection in combination with breathing protection if powder.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Abdominal cramps.
Burning sensation.
Nausea.
Vomiting.
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Do not eat, drink, or smoke during work.
Wash hands before eating.
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Rinse mouth.
Refer for medical attention.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Do NOT wash away into sewer.
Sweep spilled substance into sealable containers; if appropriate, moisten first to prevent dusting.
Carefully collect remainder,
then remove to safe place.
Personal protection: P3 filter respirator for toxic particles.
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Separated from
acids,
food and feedstuffs
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Do not transport with food and feedstuffs.
Marine pollutant.
Note: A
T symbol
R: 23/24/25
S: 1/2-26-45
UN Hazard Class: 6.1
UN Packing Group: III
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Important Data
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Physical State; Appearance:
WHITE
GRANULAR POWDER.
Physical Dangers:
Chemical Dangers:
The substance decomposes
on heating
producing toxic and corrosive fumes including fluorine.
Reacts with concentrated acids to produce corrosive hydrogen fluoride (see ICSC0283).
Occupational Exposure Limits:
TLV: (as F) 2.5 mg/m3 as TWA; A4 (not classifiable as a human carcinogen); BEI issued; (ACGIH 2004).
MAK: (as F) (Inhalable fraction) 1 mg/m3
Peak limitation category: I(4);
skin absorption (H);
Pregnancy risk group: C;
(DFG 2005).
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation of its aerosol
and
by ingestion.
Inhalation Risk:
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly.
Effects of Short-Term Exposure:
The substance
is irritating to
the eyes
,
the skin
and
the respiratory tract
.
The substance may cause effects on the calcium metabolism
, resulting in
cardiac disorders
and
impaired functions
.
Medical observation is indicated.
Effects of Long-Term or Repeated Exposure:
The substance may have effects on the bone
, resulting in fluorosis.
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Physical
Properties
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Melting point (decomposes): see Notes
Relative density (water = 1): 2.7
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Solubility in water: none
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Environmental
Data
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N O T E S
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Melts at red heat with decomposition.
Card has been partly updated in April and October 2005. See sections Occupational Exposure Limits, Emergency Response.
Transport Emergency Card: TEC (R)-61GT5-III
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ADDITIONAL INFORMATION
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ICSC: 1243
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SODIUM HEXAFLUOROSILICATE
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
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.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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