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ZINC POWDER (pyrophoric)ICSC: 1205
Blue powder
Merrillite
April 2017
CAS #: 7440-66-6
UN #: 1436 (zinc powder or dust)
EC Number: 231-175-3

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Highly flammable. May ignite spontaneously on contact with air. Many reactions may cause fire or explosion. See Chemical dangers  Finely dispersed particles form explosive mixtures in air. Risk of fire and explosion on contact with water or incompatible substances. See Chemical Dangers.  NO open flames, NO sparks and NO smoking. NO contact with oxidizing agents, acids, bases, water or incompatible substances. See Chemical Dangers.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding). Prevent deposition of dust.  Use special powder, dry sand. NO water. NO foam, carbon dioxide. NO other agents.  In case of fire: keep drums, etc., cool by spraying with water. NO direct contact of the substance with water. 

 PREVENT DISPERSION OF DUST!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation Cough.  Use local exhaust.  Fresh air, rest. Seek medical attention if you feel unwell. See Notes. 
Skin No acute symptoms expected.  Protective gloves.  First rinse with plenty of water for at least 15 minutes, then remove contaminated clothes and rinse again. 
Eyes Redness.  Wear safety spectacles.  Rinse with plenty of water (remove contact lenses if easily possible). 
Ingestion Abdominal pain. Nausea. Vomiting.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Remove all ignition sources. Consult an expert! Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Do NOT wash away into sewer. Sweep spilled substance into covered dry containers. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

flam;flameenviro;aqua
DANGER
Catches fire spontaneously if exposed to air
In contact with water releases flammable gases which may ignite spontaneously
Very toxic to aquatic life with long lasting effects 

Transportation
UN Classification
UN Hazard Class: 4.3; UN Subsidiary Risks: 4.2 

STORAGE
Fireproof. Well closed. Separated from incompatible materials and : see Chemical Dangers. Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing. 
PACKAGING
Airtight.
Marine pollutant. 
ZINC POWDER (pyrophoric) ICSC: 1205
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
GREY-TO-BLUE POWDER. 

Physical dangers
Dust explosion possible if in powder or granular form, mixed with air. If dry, it can be charged electrostatically by swirling, pneumatic transport, pouring, etc. 

Chemical dangers
On combustion forms zinc oxide fumes. See Notes. The substance is a strong reducing agent. It reacts violently with oxidants, acids and bases. Reacts with water. This produces flammable/explosive gas (hydrogen - see ICSC 0001). Reacts violently with sulfur, halogenated hydrocarbons and many other substances. This generates fire and explosion hazard. 

Formula: Zn
Atomic mass: 65.4
Boiling point: 907°C
Melting point: 419°C
Density: 7.1 g/cm³
Solubility in water: reaction
Auto-ignition temperature: 460°C  


EXPOSURE & HEALTH EFFECTS

Routes of exposure
 

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

Inhalation risk
A nuisance-causing concentration of airborne particles can be reached quickly when dispersed. 

Effects of long-term or repeated exposure
Repeated or prolonged contact with skin may cause dermatitis. 


OCCUPATIONAL EXPOSURE LIMITS
MAK: (as Zn, respirable fraction): 0.1 mg/m3; peak limitation category: I(4); (as Zn, inhalable fraction): 2 mg/m3; peak limitation category: I(1); pregnancy risk group: C; (DFG 2016) 

ENVIRONMENT
The substance is very toxic to aquatic organisms. The substance may cause long-term effects in the aquatic environment. 

NOTES
Zinc oxide fumes formed during combustion may cause metal fume fever (see ICSC 0208).
Zinc may contain trace amounts of arsenic, when forming hydrogen, may also form toxic gas arsine (see ICSC0001 and ICSC0222).
Zinc powder stabilized: Combustible solid, UN number: 3077, Hazard class: 9, Packing group: III; GHS: Warning, H400, H410. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: F, N; R: 15-17-50/53; S: (2)-43-46-60-61 

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       Toxicological Abbreviations