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.