Raw materials are delivered by sea, rail and road:between 250,000 and
400,000 tonnes each year per factory. The materials are stored in our
silos and tested in the laboratory for quality and purity.
Quartz sand, soda, dolomite and other raw materials are weighed and mixed according to a recipe.
To improve the melting process, recycled glass fragments in the volume of 20 % of the total are
then added to the mix.