The History and Evolution of Precious Metals in Spark Plugs

The use of precious metals in spark plugs has evolved significantly since their invention. This article traces the technological advancements that made platinum and iridium spark plugs the industry standard.

1. Early Spark Plug Materials (1900s-1960s)

• Originally used nickel alloys and copper cores
• Short lifespan (10,000-15,000 miles)
• Frequent replacement required

2. The Platinum Revolution (1970s)

• First platinum-tipped plugs introduced in 1970s
• Extended lifespan to 30,000+ miles
• Initially used only in luxury vehicles

3. Iridium Breakthrough (1990s-Present)

• NGK introduced first iridium plugs in 1994
• Ultra-fine electrodes improved combustion efficiency

• Current lifespan exceeds 100,000 miles

  
  

4. Why Precious Metals?

• Extremely high melting points (platinum: 3,215°F, iridium: 4,435°F)
• Superior corrosion resistance
• Maintain sharp electrode edges for consistent spark

5. Future Developments

• Potential use of ruthenium and other rare metals
• Laser-welding techniques for more precise metal application
• Emerging technologies may reduce but not eliminate precious metal needs

Recycle Your Old Spark PlugsEvery generation of spark plugs contains recoverable precious metals. Contact us to recycle plugs from any era.