CHEMICAL AND PHYSICAL PROPERTIES
Physical Description | Hafnium powder, dry, is a grayish metallic colored powder. Dust from dry powder may be ignited by static electricity. The dry powder reacts with moisture to produce hydrogen, a flammable gas. The heat from this reaction may be sufficient to ignite the hydrogen. It does not appreciably react with large quantities of water. |
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Color/Form | Gray crystals |
Boiling Point | 8316 °F at 760 mmHg (NIOSH, 2023) |
Melting Point | 4041 °F (NIOSH, 2023) |
Solubility | Insoluble (NIOSH, 2023) |
Density | 13.31 (NIOSH, 2023) - Denser than water; will sink |
Vapor Pressure | 0 mmHg (approx) (NIOSH, 2023) |
Autoignition Temperature | 20 °C for dust cloud |
Decomposition | May explosively decompose on shock, friction, or concussion. /Hafnium powder/ |
Corrosivity | Good corrosion resistance |
Other Experimental Properties | Atomic number: 72; ductile; has been successfully alloyed with iron, titanium, niobium, tantalum, and other metals; rapidly absorbs hydrogen to form HfH at 700 °C; halogens react directly to form tetrahalides; properties are considerably influenced by impurities of zirconium present |
Chemical Classes | Metals -> Elements, Metallic |
SAFETY INFORMATION
Signal word | Danger |
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Pictogram(s) |
Flame Flammables GHS02 |
GHS Hazard Statements |
H228:Flammable solids |
Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P240:Ground/bond container and receiving equipment. P241:Use explosion-proof electrical/ventilating/lighting/…/equipment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P370+P378:In case of fire: Use … for extinction. |
COMPUTED DESCRIPTORS
Molecular Weight | 178.49 g/mol |
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Hydrogen Bond Donor Count | 0 |
Hydrogen Bond Acceptor Count | 0 |
Rotatable Bond Count | 0 |
Exact Mass | 179.94656 g/mol |
Monoisotopic Mass | 179.94656 g/mol |
Topological Polar Surface Area | 0 Ų |
Heavy Atom Count | 1 |
Formal Charge | 0 |
Complexity | 0 |
Isotope Atom Count | 0 |
Defined Atom Stereocenter Count | 0 |
Undefined Atom Stereocenter Count | 0 |
Defined Bond Stereocenter Count | 0 |
Undefined Bond Stereocenter Count | 0 |
Covalently-Bonded Unit Count | 1 |
Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Hafnium powder, dry, is a grayish metallic colored powder. Dust from dry powder may be ignited by static electricity. The dry powder reacts with moisture to produce hydrogen, a flammable gas. The heat from this reaction may be sufficient to ignite the hydrogen. It does not appreciably react with large quantities of water.