Best Alumina Ceramic Insulator

NGK 4462 Laser Iridium Spark Plug - IZFR6J, 1 Pack

Tapered-cut ground electrode improves ignitability and reduces quenching.
98% pure copper core increases heat dissipation for more reliable starts and prevents spark plug from overheating.
High-grade alumina silicate ceramic insulator for superior strength and heat transfer.
Iridium is six times more durable than platinum.

Denso (3297) SK20R11 Spark Plugs, Pack of 4

Twin-tip technology with 11 mm platinum center electrode and 11 mm titanium enhanced ground electrode.
Improve fuel economy, better acceleration and faster starts than all other single platinum plugs.
Purified alumina powder insulator provides exceptional dielectric strength and thermal conductivity, allowing the material to stand up to extreme stress.

Sportster Sport XL 1200S Performance Spark Plugs Pair repl. OEM# 6R12

Conventional style spark plugs, available in OEM heat ranges.
Plugs have a unique look with a black ceramic body.
Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation.

NGK Spark Plug, NGK CR7E, ea, 1

98% pure copper core increases heat dissipation for more reliable starts and prevents spark plug from overheating.
High-grade alumina silicate ceramic insulator for superior strength and heat transfer.
Cold-rolled threads to prevent cross-threading and damage to cylinder heads.
Trivalent plating eliminates need for anti-seize and corrugated ribs prevent flashover.

NGK Spark Plug BU8H- Set of 4

98% pure copper core increases heat dissipation for more reliable starts and prevents spark plug from overheating.
High-grade alumina silicate ceramic insulator for superior strength and heat transfer.
Cold-rolled threads to prevent cross-threading and damage to cylinder heads.
Trivalent plating eliminates need for anti-seize and corrugated ribs prevent flashover.

Denso (4507) PQ16TT Platinum TT Spark Plug, (Pack of 1)

Twin-tip technology with 11 mm platinum center electrode and 11 mm titanium enhanced ground electrode.
Improve fuel economy, better acceleration and faster starts than all other single platinum plugs.
Purified alumina powder insulator provides exceptional dielectric strength and thermal conductivity, allowing the material to stand up to extreme stress.

NGK 4730 Standard Spark Plug - BPR8Z, 1 Pack

98% pure copper core increases heat dissipation for more reliable starts and prevents spark plug from overheating.
High-grade alumina silicate ceramic insulator for superior strength and heat transfer.
Cold-rolled threads to prevent cross-threading and damage to cylinder heads.
Trivalent plating eliminates need for anti-seize and corrugated ribs prevent flashover.

NGK 5044 Iridium IX Spark Plug - BR8EIX, 1 Pack

fine wire center electrodes ensure high durability and consistently stable spark.
iridium alloy has an extremely high melting point, perfect for today's high-tech, high-performance engines.
pure alumina silicate ceramic insulator provides superior strength and better heat transfer.

NGK 6222 Standard Spark Plug - BPR5HS, 1 Pack

98% pure copper core increases heat dissipation for more reliable starts and prevents spark plug from overheating.
High-grade alumina silicate ceramic insulator for superior strength and heat transfer.
Cold-rolled threads to prevent cross-threading and damage to cylinder heads.
Trivalent plating eliminates need for anti-seize and corrugated ribs prevent flashover.