alumina ceramic igniter Electrical insulation

Alumina Ceramic Igniter Electrical Insulation

No. Parameter Typical Value / Range Unit
1 Al₂O₃ Purity Content 95% – 99.5% wt%
2 Raw Al₂O₃ Powder Median Particle Size (D50) 1.2 – 1.8 μm
5 Glaze / Surface Finish High-voltage resistant glaze; Ra <0.8 μm (roughness)
6 Dielectric Constant (εr at 1 MHz, 25°C) 9.0 – 9.8 –
7 Breakdown / Withstand Voltage ≥35 – 45 kV/mm
8 Coefficient of Thermal Expansion (CTE, 20–1000°C) 7.0 – 8.0 ×10⁻⁶ /°C
9 Sintering Linear Shrinkage Rate 15% – 20% %
10 Porosity (Open) <0.5% %
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High-Performance Alumina Ceramic Spark Plug Insulator

The spark plug insulator (white ceramic body) reliably insulates tens of kV from the ignition coil to the center electrode under extreme combustion conditions: >800–1000°C, thermal shock, high voltage, and chemical corrosion.

Made from high-purity alumina ceramic using optimized formulation, isostatic pressing, high-temperature sintering, and precision finishing — delivering excellent insulation, heat dissipation, and long-term durability for modern high-performance engines.

Core Advantages

  • Outstanding high-temp insulation & no flashover
  • Superior heat removal → lower pre-ignition risk
  • Long life (>100,000 km typical)
  • Anti-tracking rib design
  • Tight tolerances & reliable fit
  • Excellent cost-performance

Applications

  • Gasoline cars (turbo/GDI)
  • Motorcycles & racing
  • Small engines (generators, lawn, UAV)
  • CNG/LPG/natural gas engines
  • Aftermarket/performance upgrades

FAQ

Q1: What alumina purity do you recommend for high-performance/turbo engines?

A: 95%–99% Al₂O₃ offers the best combination of thermal conductivity, dielectric strength, and thermal shock resistance.

Q2: Can these insulators be used to manufacture racing or iridium spark plugs?

A: Yes — they are widely used in premium racing and high-end iridium/platinum spark plugs due to excellent heat management and durability.

Q3: Do you provide samples for testing?

A: Yes, small quantities of samples are available. Please contact us with your required specifications.

Contact us for custom specs, samples, or bulk pricing!

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