Second half of the 1950s


Inspired by one of his many business trips abroad, Danish civil engineer, Dr. Haldor Topsøe, starts to develop ultra-pure silicon on the basis of float zone technology in the basement of his home, Hellerup, Copenhagen.

In 1958 Haldor Topsøe cuts the first sod for his new catalysts plant in Frederikssund, Denmark, less than an hour's drive out of Copenhagen. One year later, he initiates industrial manufacture of ultra-pure silicon in a corner of the plant. Hence Topsil ("Top" for Topsøe and "sil" for silicon) is in operation.