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7440-58-6

7440-58-6 structural image
Product Name: HAFNIUM
Formula: Hf
Synonyms: Celtium;Hafnium;Hafnium element;
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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.
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
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
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.