After drying, the products are transferred to a kiln, where they are fired over a period of six to 36 hours. Firing gives the products a durable strength and makes them permanently non-flammable and fire-proof.
Wienerberger engineers are continuously working on reducing the energy consumption of the drying and firing process. Kiln and firing technologies as well as airstream systems have reduced the required firing time by up to two-thirds in recent years. Additionally, the residual heat from the cooling process is recovered and recycled in the drying process.