ICSC 0847 - HAFNIUM POWDER (pyrophoric)

HAFNIUM POWDER (pyrophoric)	ICSC: 0847 (November 2019)

CAS #: 7440-58-6

UN #: 2545 (powder, dry)

EC Number: 231-166-4

	ACUTE HAZARDS	PREVENTION	FIRE FIGHTING
FIRE & EXPLOSION	Flammable. Finely dispersed particles form explosive mixtures in air. Risk of fire and explosion. See Chemical Dangers.	NO open flames, NO sparks and NO smoking. Do NOT expose to friction or shock. Closed system, dust explosion-proof electrical equipment and lighting. Prevent deposition of dust.	Use special powder, dry sand, water in large amounts.

STRICT HYGIENE!
	SYMPTOMS	PREVENTION	FIRST AID
Inhalation		Avoid inhalation of dust. Use closed system.	Fresh air, rest.
Skin		Protective gloves.	Rinse contaminated clothes (fire hazard) with plenty of water. Remove contaminated clothes. Rinse and then wash skin with water and soap.
Eyes	Redness.	Wear safety spectacles.	Rinse with plenty of water (remove contact lenses if easily possible).
Ingestion		Do not eat, drink, or smoke during work. Wash hands before eating.	Rinse mouth.

SPILLAGE DISPOSAL	CLASSIFICATION & LABELLING
Remove all ignition sources. Evacuate danger area! Consult an expert! Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Wet powder to prevent dusting and ignition. Sweep spilled substance into covered water-filled containers. Then store and dispose of according to local regulations. Do NOT wash away into sewer. Do NOT absorb in saw-dust or other combustible absorbents.	According to UN GHS Criteria DANGER Catches fire spontaneously if exposed to air Transportation UN Classification UN Hazard Class: 4.2; UN Pack Group: I
STORAGE
Fireproof. Separated from strong oxidants, strong acids and halogens. Keep under inert gas. Store only in original container.
PACKAGING

HAFNIUM POWDER (pyrophoric)

ICSC: 0847

PHYSICAL & CHEMICAL INFORMATION
Physical State; Appearance GREY POWDER. Physical dangers Ignites in air when finely divided. Dust explosion possible if in powder or granular form, mixed with air. Chemical dangers The substance may ignite spontaneously on contact with air. May decompose on shock, friction or concussion. May explode on heating. Reacts violently with halogens, strong acids and strong oxidants. This generates explosion hazard.	Formula: Hf Atomic mass: 178.5 Boiling point: 4602°C Melting point: 2222°C Relative density (water = 1): 13.31 Solubility in water: none Auto-ignition temperature: 20°C

PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
GREY POWDER.

Physical dangers
Ignites in air when finely divided. Dust explosion possible if in powder or granular form, mixed with air.

Chemical dangers
The substance may ignite spontaneously on contact with air. May decompose on shock, friction or concussion. May explode on heating. Reacts violently with halogens, strong acids and strong oxidants. This generates explosion hazard.

Formula: Hf
Atomic mass: 178.5
Boiling point: 4602°C
Melting point: 2222°C
Relative density (water = 1): 13.31
Solubility in water: none
Auto-ignition temperature: 20°C

EXPOSURE & HEALTH EFFECTS
Routes of exposure Effects of short-term exposure May cause mechanical irritation to the eyes, skin and respiratory tract.	Inhalation risk Effects of long-term or repeated exposure

EXPOSURE & HEALTH EFFECTS

Routes of exposure

Effects of short-term exposure
May cause mechanical irritation to the eyes, skin and respiratory tract.

Inhalation risk

Effects of long-term or repeated exposure

OCCUPATIONAL EXPOSURE LIMITS
TLV: 0.5 mg/m³, as TWA

ENVIRONMENT
Environmental effects from the substance have not been investigated adequately.

NOTES
Insufficient data are available on the effect of this substance on human health, therefore utmost care must be taken. Powder is normally handled wetted with no less than 25% of water to reduce the fire and explosion risk. UN number 2545 is for dry powder, according to the specification of the powder Packing Group can be either I, II, or III. The GHS classification will also vary according to the specification of the powder. Other UN number is: 1326 HAFNIUM POWDER, WETTED with not less than 25% water; class 4.1; packing group: II.

NOTES

Insufficient data are available on the effect of this substance on human health, therefore utmost care must be taken.
Powder is normally handled wetted with no less than 25% of water to reduce the fire and explosion risk. UN number 2545 is for dry powder, according to the specification of the powder Packing Group can be either I, II, or III. The GHS classification will also vary according to the specification of the powder. Other UN number is: 1326 HAFNIUM POWDER, WETTED with not less than 25% water; class 4.1; packing group: II.

ADDITIONAL INFORMATION

EC Classification

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    See Also:
       Toxicological Abbreviations