(unstable powder)
Zr
Atomic mass: 91.2
ICSC # 1405
CAS # 7440-67-7
RTECS # ZH7070000
UN # 2008
EC # 040-001-00-3
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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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Combustible.
Many reactions may cause fire or explosion.
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NO open flames.
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Dry sand,
dry powder.
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Explosion
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Finely dispersed particles form explosive mixtures in air.
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Prevent deposition of dust; closed system, dust explosion-proof electrical equipment and lighting.
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Exposure
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See EFFECTS OF LONG-TERM OR REPEATED Exposure.
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PREVENT DISPERSION OF DUST!
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•Inhalation
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Local exhaust or breathing protection.
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Fresh air, rest.
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•Skin
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Protective gloves.
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Remove contaminated clothes.
Rinse and then wash skin with water and soap.
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•Eyes
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Redness.
Pain.
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Safety goggles.
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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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Do not eat, drink, or smoke during work.
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Rinse mouth.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting.
Carefully collect remainder,
then remove to safe place.
Personal protection: P2 filter respirator for harmful particles.
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See Chemical Dangers.
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F symbol
R: 15-17
S: 2-7/8-43
UN Hazard Class: 4.2
UN Packing Group: I
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Important Data
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Physical State; Appearance:
HARD, LUSTROUS, GREYISH WHITE FLAKES
OR GREY AMORPHOUS POWDER
Physical Dangers:
Dust explosion possible if in powder or granular form, mixed with air.
Chemical Dangers:
Reacts violently with borax, carbon tetrachloride when heated.
Reacts explosively when heated with alkali metal hydroxides.
Occupational Exposure Limits:
TLV: 5 mg/m3 as TWA; 10 mg/m3 as STEL; A4 (not classifiable as a human carcinogen); (ACGIH 2008).
MAK: (Inhalable fraction) 1 mg/m3 sensitization of respiratory tract and skin (Sah);
Peak limitation category: I(1); Pregnancy risk group: D;
(DFG 2008).
OSHA PEL: TWA 5 mg/m3
NIOSH REL*: TWA 5 mg/m3 ST 10 mg/m3 *Note: The REL applies to all zirconium compounds (as Zr) except Zirconium tetrachloride.
NIOSH IDLH: 50 mg/m3 (as Zr) See: IDLH INDEX
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Routes of Exposure:
Inhalation Risk:
A harmful concentration of airborne particles can be reached quickly when dispersed.
Effects of Short-Term Exposure:
May cause mechanical irritation to the eyes.
Effects of Long-Term or Repeated Exposure:
Lungs may be affected by repeated or prolonged exposure to dust particles.
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Physical
Properties
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Boiling point: 3577°C
Melting point: 1857°C
Relative density (water = 1): 6.5
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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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Other UN numbers: 1358 Zirconium powder; wetted; hazard class 4.1, packaging group II; 1932 Zirconium scrap, hazard class 4.2, packaging group III; 2009 Zirconium, dry, finished metal sheets, wire, strip, hazard class 4.2, packaging group III; 2858 Zirconium, metal sheets, 18-254 microns, hazard class 4.1, packaging group III. Pure Zirconium sponge is pyrophoric and violently explosive when impure.
Transport Emergency Card: TEC (R)-42GS4-I+II+III
Card has been partially updated in February 2009: see Occupational Exposure Limits.
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ADDITIONAL INFORMATION
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ICSC: 1405
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ZIRCONIUM
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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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