Cast-steel and some cast-irons need to be heat-treated to get the correct mechanical properties. Zeeuws Vlaamse Gieterij has two gas furnaces, measurements 4,3 x 1,7 x 1,5 m. and 1,2 x 1,2 x 1,4 m.and also three smaller electrical furnaces. All furnaces are digitally controlled and the treatment is documented.