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ZINC POWDER (pyrophoric)ICSC: 1205 (November 2019)
Blue powder
CAS #: 7440-66-6
UN #: 1436 (zinc powder or dust)
EC Number: 231-175-3

FIRE & EXPLOSION Highly flammable. May ignite spontaneously on contact with air. Many reactions may cause fire or explosion.  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.  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. 

Inhalation Metallic taste. Sore throat. Cough. Weakness. Fever. See Effects of short-term exposure.  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 . 

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

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 

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

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. 
Marine pollutant. 
ZINC POWDER (pyrophoric) ICSC: 1205

Physical State; Appearance

Physical dangers
Ignites in air when finely divided. 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  


Routes of exposure
The substance can be absorbed into the body by inhalation. 

Effects of short-term exposure
May cause mechanical irritation to the eyes and respiratory tract. Inhalation of the respirable fraction may cause metal fume fever. This may result in influenza-like symptoms. The effects may be delayed up to 48 hours. 

Inhalation risk
A harmful concentration of airborne particles can be reached quickly when dispersed, especially if powdered or as fumes. 

Effects of long-term or repeated exposure
Repeated or prolonged contact with skin may cause dermatitis. Repeated or prolonged inhalation may cause effects on the lungs. This may result in reduced lung function . 

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(2); pregnancy risk group: C; (DFG 2019) 

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

Zinc oxide fumes formed during combustion may cause metal fume fever (see ICSC 0208).
The symptoms of metal fume fever do not become manifest until hours.
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. 

  EC Classification
H250; H260; H400 / H400; H410 

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