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It is a question concerning the IRIDIUM TOUGH that is often.
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Is the tip in the IRIDIUM TOUGH made of pure iridium? |
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| We use a new iridium alloy developed at DENSO. |
| Iridium is characterized by a higher melting point than either nickel or platinum. Therefore, it wears very well when subject to electrical discharge. However, at high temperatures it oxidizes a little too much and so we are unable to use pure iridium for spark plug electrodes. |
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| DENSO studied many additives with a view to improving the corrosion resistance of iridium and has now developed a new iridium alloy (the alloy of iridium and rhodium) highly suitable for use in spark plug electrodes. Patents for this iridium alloy have been secured in Japan, the United Kingdom, the United States, PeopleÕs Republic of China and Republic of Korea. (Japan Patents 2877035, 3000955, 2921524. UK Patent 2302367. US Patents 6094000, 6262522, 5977695, 6078129. PeopleÕs Republic of China Patent 961022841. Republic of Korea Patent 0292083.) The following photographs compare the durability of the new iridium alloy and pure iridium when used in an engine under the same conditions. |
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| Part of the pure iridium material was shed and corroded. The new DENSO iridium alloy showed no corrosion on the electrode and mainfained good condition. |
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