History & Manufacturing process

1944 US patent
1950 Fiskaa Plant in Kristiansand (Elkem) installs first pilot filter for microsilica; early research into application areas for MS
1952 First testing of silica fume in Portland-cement-based concretes. World's first publication on use of microsilica in concrete
1950-1953 Pioneer work on use of microsilica in refractories
1965-1970 Some companies invest in electrostatic precipitators Limited success; practically no longer in use
1969 Commercial sales of microsilica to the fertiliser industry begin
1970 First generation baghouse filters – also not successful
1971 Commercial sales of microsilica to the concrete industry begin
1974 Fiskaa Plant engineers (later forming the Elkem Materials' Filtration and Powder Technology Group, or FPT) totally re-design the industrial baghouse filter.
1980-1985 Strong increase in know-how regarding the chemical and physical properties of microsilica
1981 Sales to the fibre cement industry in 1980, to the castable refractories industry in 1981 and to the oil-well industry in 1984
1984 Introduction of membrane technology (PTFE) for filtration
1990's Microsilica is recognised as a concrete additive that provides improved properties of both fresh and hardened concrete. Focus on durability and service life.
2000 Microsilica is a staple of high-performance concrete production. Numerous megaprojects have been completed. International Standards are available.

Silica fume has entered into common use in a majority of industrial countries and many developing countries.

Silica fume has long since been an internationally tradable product. Today, it is estimated that 15 million m3/year silica fume concrete are produced globally; the accumulated volume must by now have exceeded 200 million or more m3.