* High melting point: They can withstand the high temperatures generated during sparking.
* Good electrical conductivity: They ensure efficient current transfer.
* Resistance to wear and corrosion: They can handle the repeated contact and separation without degrading.
While tungsten is generally preferred due to its lower cost, platinum offers superior wear resistance and is often used in high-performance applications.
However, depending on the application and specific requirements, other materials might be used, such as:
* Silver: Offers excellent conductivity but is less wear-resistant than tungsten or platinum.
* Silver-cadmium oxide: Provides good conductivity and wear resistance, but cadmium is toxic.
The choice of materials for breaker point contacts is crucial for the reliable operation of the ignition system.
