International Chemical Safety Cards

SODIUM HEXAFLUOROSILICATE

ICSC: 1243

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
October 27, 1994 Peer reviewed

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: use appropriate extinguishing media.
EXPLOSION

EXPOSURE		PREVENT DISPERSION OF DUST!
•INHALATION	Burning sensation. Cough. Sore throat. See Ingestion.	Avoid inhalation of fine dust and mist. Local exhaust or breathing protection.	Fresh air, rest. Refer for medical attention.
•SKIN	Redness. Pain.	Protective gloves. Protective clothing.	Remove contaminated clothes. Rinse skin with plenty of water or shower.
•EYES	Redness. Pain.	Safety goggles or eye protection in combination with breathing protection if powder.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
•INGESTION	Abdominal cramps. Burning sensation. Nausea. Vomiting.	Do not eat, drink, or smoke during work. Wash hands before eating.	Rinse mouth. Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

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.

Separated from acids, food and feedstuffs .

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

SEE IMPORTANT INFORMATION ON BACK

ICSC: 1243

Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

International Chemical Safety Cards

SODIUM HEXAFLUOROSILICATE

ICSC: 1243

I

M

P

O

R

T

A

N

T

D

A

T

A

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/mł as TWA; A4 (not classifiable as a human carcinogen); BEI issued; (ACGIH 2004).
MAK: (Inhalable fraction) 2.5 mg/mł;
Peak limitation category: II(2);
(DFG 2004).

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.

PHYSICAL
PROPERTIES

Melting point (decomposes): see Notes
Relative density (water = 1): 2.7

Solubility in water: none

ENVIRONMENTAL
DATA

N O T E S

Melts at red heat with decomposition. Card has been partly updated in April 2005. See sections Occupational Exposure Limits, Emergency Response.

Transport Emergency Card: TEC (R)-61GT5-III

ADDITIONAL INFORMATION

ICSC: 1243	SODIUM HEXAFLUOROSILICATE
(C) IPCS, CEC, 1994

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.