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Suffix -2 for semiconductor grades that end in the number 1; and -1 for other grades (industrial)
Effect Reduces impurities to 5 ppm or less as determined by ash analysis
Summary Unpurified POCO graphites have typical impurity levels of about 1000 ppm, but they can have up to 3000 ppm. The dominant impurity is vanadium, with some iron, aluminum, calcium, nickel, titanium, and silicon. Gaseous impurities do not show up in ash tests, and may be present in small amounts in purified materials
Physical Properties Not affected
Application Recommended after final machining