ICSC 1242 - POTASSIUM HEXAFLUOROSILICATE

[List of Chemicals] [Risk Notes] [Risk Phrases] [Safety Phrases] [Danger Symbols]

POTASSIUM HEXAFLUOROSILICATE

ICSC: 1242
_{October 1994}

Potassium fluorosilicate
Potassium silicofluoride
Dipotassium hexafluorosilicate

CAS No: 16871-90-2
RTECS No: VV8400000
UN No: 2655
EC No: 009-012-00-0

K₂SiF₆
Molecular mass: 220.3

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	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.	T Symbol R: 23/24/25 S: (1/2-)26-45 Note: A UN Hazard Class: 6.1 UN Pack Group: III	Do not transport with food and feedstuffs. Marine pollutant.

EMERGENCY RESPONSE	SAFE STORAGE
Transport Emergency Card: TEC (R)-61GT5-III	Separated from acids, food and feedstuffs.

IMPORTANT DATA

Physical State; Appearance
WHITE CRYSTALS OR FINE POWDER.

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).

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 when dispersed.

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	ENVIRONMENTAL DATA
Melting point (decomposes): see Notes Relative density (water = 1): 2.3 Solubility in water: none

NOTES

Temperature of decomposition unknown in literature.
Card has been partly updated in April and October 2005. See sections Occupational Exposure Limits, Emergency Response.

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004

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