Some non-news (and also somehow inaccurate). I started using this kind of expanding agents in 1985 or 1986, it was AFAIK originally developed in Japan under th

Some non-news (and also somehow inaccurate). I started using this kind of expanding agents in 1985 or 1986, it was AFAIK originally developed in Japan under the brand name Bristar: http://www.taiheiyo-m.co.jp/english/product/productSubtop_4/ http://www.taiheiyo-m.co.jp/english/product/productSubtop_4/ I believe it was invented and commercialized initially during the late 1960's/early 1970's: http://www.fundinguniverse.com/company-histories/taiheiyo-cement-corporation-history/ http://www.fundinguniverse.com/company-histories/taiheiyo-ce...