We have a first supplier for metakaolin MK-750, coined ARGICAL M1200S, specially designed for geopolymer application. It is the French kaolin clay company AGS, member of the Imerys group.
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To get the technical sheet (presently in French), go to the page Building Materials on the left margin and click on 1200S.pdf at the bottom of the page.
The ARGICAL brand is used for geopolymer resin, namely that of the (K,Na)-PSS, (K,Na)-poly(sialate-siloxo) type, and other high-tech applications.
Professor Joseph Davidovits