Glass industry

Silica sands for glassworks are required to be of the utmost purity, meaning SiO₂ content of at least 99,2 % and with low contents of Fe₂O₃, Al₂O₃ and TiO₂. Our silica sands are supplied worldwide to window glass manufacturers of solar glass, colourless, packaging and technical glass. Our sands are also used for glass batches which are subsequently used for soluble glass manufacturing. An equally essential application is in glass wool production for the construction industry.

This is a refractory material (more than 1800 °C) intended for places exposed to high heat in the casting production, and not just in steel casting. Compared to silica sand, it differs in its higher cooling effect, penetration resistance and lower thermal expansion. However, its relative density is higher. It is also used in the glass production where glass is tinted, as well as in the production of ceramics.

Dolomite gravels and flours are characterised by a high CaMg(CO₃)₂ content (min. 90 %) and a low CaCO₃ content (only max. 10 %), with a low Fe₂O₃ content. Dolomite aggregate is crushed and ground into gravels and flours of various grain sizes at Grudzeń Las. These are mostly applied in glassworks, where the calcium carbonate is used as a stabiliser. It also modifies viscosity and increases the durability of glass. Another major area of application is in the construction industry.

Laboratory instruments from the MULTISERW-MOREK company are sought after for their tradition, quality and reliability. The H-GLOST company, a prominent sales representative for the Czech Republic and Slovakia, provides complete supplies of the entire range of products. We are not the best in the world, which is why we provide you, our customers, with all warranty and post-warranty repairs directly in the MULTISERW-MOREK company. This guarantees our customers that all spare parts are original and that the software used is updated. 

Our laboratories at Grudzeń Las sand plants and the H-GLOST laboratory have these products installed and we use them to our full satisfaction. Therefore, we only offer such products of which we are convinced, based on our experience, that are of high quality.