Download Data Sheet. K10 High Reactive Metakaolin: Metakaolin K10 is a superfine, flashcalcined metakaolin with a high pozzolanic reactivity for use in various appliions requiring very fine particle sizes. The pozzolanic reactivity is defined through the metakaolin's ability to react with free lime as the byproduct of Portland cement hydration. Addition of K10 metakaolin has been shown ...