Product Description of Palladium CAS#7440-05-3
Palladium is a rare transition metal belonging to the platinum group elements and is classified as a light platinum-group metal. It appears as a silvery-white metal with a smooth metallic appearance, moderate hardness, excellent ductility, and good processing performance.
Due to its unique position among transition metals, palladium shares many physical and chemical characteristics with both nickel and platinum. It is soft, highly ductile, and can be readily processed into thin foils or fine wires for specialized applications.
Palladium exhibits excellent chemical stability and corrosion resistance. It is insoluble in water and remains stable under normal conditions, while it can be dissolved by strong acids such as aqua regia, hot nitric acid, and sulfuric acid. It shows limited solubility in hydrochloric acid.
With its combination of high catalytic activity, corrosion resistance, excellent workability, and precious metal properties, palladium is widely used in catalysts, electronic components, chemical processing, automotive applications, and advanced material industries.
Palladium Chemical Properties
| Melting point | 1554 °C(lit.) |
| Boiling point | 2970 °C(lit.) |
| Density | 1.025 g/mL at 25 °C |
| Storage temp. | No restrictions. |
| Solubility | Soluble in aqua regia |
| Form | Wire |
| Color | Silver-gray |
| Specific Gravity | 12.03 |
| Odor | Odorless |
| Resistivity | 9.96 μΩ-cm, 20°C |
| Water Solubility | INSOLUBLE |
| Merck | 146,989 |
| Exposure limits | ACGIH: TWA 1 mg/m3 |
| OSHA: TWA 15 mg/m3; TWA 5 mg/m3 | |
| Stability | Stable. Flammable - fine powder may cause fire or explosion in air. Incompatible with ozone, sodium tetrahydroborate, sulphur, arsenic. |
| InChIKey | KDLHZDBZIXYQEI-UHFFFAOYSA-N |
| CAS DataBase Reference | 7440-05-3(CAS DataBase Reference) |
| NIST Chemistry Reference | Palladium(7440-05-3) |
| EPA Substance Registry System | Palladium (7440-05-3) |
Safety Information
| Hazard Codes | T,F,Xi |
| Risk Statements | 61-33-37/38-40-41-36/37/38-11 |
| Safety Statements | 53-26-36/37/39-24/25-36-22 |
| RIDADR | UN 3089 4.1/PG 2 |
| WGK Germany | - |
| RTECS | RT3480500 |
| Autoignition Temperature | >1120 °F |
| TSCA | Yes |
| HazardClass | 4.1 |
| PackingGroup | III |
| HS Code | 28439000 |
| Hazardous Substances Data | 7440-05-3(Hazardous Substances Data) |
| Toxicity | LD50 oral (rat) 200 mg/kg (palladium chloride) |
| LC50 intratracheal (rat) 6 mg/kg (palladium chloride) |
Product Application of Palladium CAS#7440-05-3
Palladium is a valuable platinum-group metal widely used in advanced industrial, chemical, electronic, and medical applications. It is naturally found in association with nickel and copper ores and has become an important material due to its excellent catalytic properties, corrosion resistance, and hydrogen absorption capability.
In catalytic chemistry, palladium plays a crucial role as an efficient catalyst in various organic reactions, especially hydrogenation, dehydrogenation, and hydrogen-related transformation processes. It is widely used in catalysts such as the Lindlar catalyst and is also important in petroleum refining processes, including hydrocarbon conversion, cracking, and purification.
The automotive industry is one of the major application areas for palladium. Together with platinum and other precious metals, palladium is used in automotive catalytic converters to promote the conversion of harmful exhaust components, helping reduce emissions of unburned hydrocarbons and improve environmental performance.
Palladium is also widely applied in the production of electronic components, electrical contacts, surgical instruments, precision equipment, high-performance spark plugs, clock components, and specialty wires due to its excellent conductivity, durability, and chemical stability.
In the jewelry and medical fields, palladium alloys are valued for their attractive appearance and biocompatibility. Palladium-containing alloys are used in white gold jewelry, watch components, dental materials, and medical devices, including certain applications in prosthetic and restorative materials.
Because palladium can absorb significant amounts of hydrogen, it is also utilized in hydrogen-related technologies, catalytic systems, and chemical sensing applications. Its ability to interact with gases such as carbon monoxide further supports its use in specialized detection and monitoring equipment.
With its unique combination of catalytic efficiency, chemical stability, hydrogen absorption capacity, and premium metallic properties, palladium remains an essential material in modern industry and advanced technology applications.
