Palladium CAS#7440-05-3
Excellent Workability: Highly ductile and malleable, palladium can be easily formed into thin sheets or drawn into fine wires for precision applications.
Platinum-Like Performance: Palladium shares many chemical and physical properties with platinum, delivering similar performance at a typically lower cost.
Strong Chemical Stability: Resistant to water and many environments, and only dissolves in specific strong acids, making it reliable for demanding chemical processes.
High Purity Metallic Appearance: Its silvery-white, clean metallic finish makes it suitable for high-end industrial, electronic, and decorative applications.
Product Description of Palladium CAS#7440-05-3
Palladium is a transition metal belonging to the nickel group (Group III) and is classified as a light platinum-group metal in the periodic table. It appears as a silvery-white metal with moderate hardness, good forgeability, and excellent ductility. Palladium occupies an intermediate position in Group 10 of the transition elements, spanning periods 4, 5, and 6.
Many of its characteristics closely resemble those of nickel, located above it in the group, and platinum, located below it. In both chemical and physical behavior, palladium is very similar to platinum. It is soft, silvery-white, and highly workable, allowing it to be rolled into thin sheets or drawn into extremely fine wires.
In terms of chemical reactivity, palladium dissolves in aqua regia, hot nitric acid, and sulfuric acid, is slightly soluble in hydrochloric acid, and remains insoluble in both cold and hot water.
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 soft, white metal that occurs naturally in copper and nickel ores. Its chlorides were used in photographic and printing processes in the early 20th century and are still applied today, often in combination with platinum for specialized printing applications.
As a transition metal, palladium plays an important role in catalytic reactions, especially in hydrogenation processes such as those involving the Lindlar catalyst. One of its most significant uses is in the catalytic hydrogenation, dehydrogenation, and cracking of petroleum, which are essential operations in organic synthesis and oil refining.
Palladium, together with platinum, is installed in automotive catalytic converters to help reduce emissions of unburned hydrocarbons. It is also used in the manufacture of surgical instruments, electrical contacts, clock springs, high-performance spark plugs, and specialty wires, and it serves as a form of “white gold” in the jewelry industry.
Palladium–gold alloys are widely applied in dentistry and medicine, including for replacing damaged bones and joints and for use as supports in porcelain-covered bridges. Palladium alloys are also popular in decorative and jewelry applications, such as gemstones, watch cases, and brooches, as alternatives to gold. In addition, palladium can absorb large amounts of hydrogen, which makes it an excellent catalyst in chemical reactions and in catalytic converters for internal combustion engines. Its ability to absorb carbon also allows it to be used in carbon monoxide monitoring devices.
