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Iridium Alloy
In a never-ending effort to improve upon success,
DENSO developed an Iridium alloy that is superior to platinum based on hardness,
strength and melting point. The new Iridium alloy is composed primarily of Iridium
with rhodium mixed in for oxidation wear. Iridium Alloy Pure Iridium has a melting
point of almost 700?C higher than platinum, and had the greatest potential for resistances
against wear. Iridium by itself is susceptible to oxidation wear at temperatures over 900?C,
however, ordinary driving around town an engine would never reach these temperatures. Further
testing proved that Iridium alone would not meet DENSO's demanding standards. After testing other
pure metals combined with Iridium, rhodium proved to be the best choice to meet the needs of DENSO's spark plug engineers

Laser Welding Process
DENSO's Iridium Alloy had all of the qualities to produce the world's best spark plug, but conventional
tooling prevented DENSO from mass manufacturing. Due to the high melting point there wasn't a welding process
hot enough to join the Iridium tip to the nickel base. Necessity to melt the Iridium to the nickel base forced
DENSO to pioneer its third patent, the 360? Laser Welding Process, to provide a seal so reliable; the electrode
resists wear even in the worst combustion conditions.

Fewer Volts Means More Amps
DENSO Iridium spark plugs require on average 5,000 fewer volts to fire than conventional spark plugs.
Less power is required to fire DENSO Iridium Power Plugs, and coupled with our patented U-Groove technology,
the use of Iridium alloy, the tapered cut, and the ultra fine 0.4mm diameter electrode translates to increased
horsepower throughout the dyno range.