Flue gas desulphurisation gypsum from Vliegasunie is used for producing fibre plasterboards, gypsum plasterboards and the production of mortars for calcium sulphate based screeds.

Fibre plasterboards are applied as a finishing board in interiors where fire resistance, impact resistance and sound insulation are important. This may be interior walls, ceilings, but also as a floor element. The boards are made of gypsum and cellulose fibres with an overall ratio of 80:20. The cellulose fibres are the reinforcement of the gypsum.
If necessary perlite granules are added to reduce weight while maintaining fire resistance. The gypsum undergoes a heat treatment 'calcination' in a rotary kiln at 120-180 ˚C, where calcium sulphate hemihydrate is created. The cellulose fibres are obtained from old newsprint, which is milled into fibre. The fibres and calcium sulphate hemihydrate are dry mixed, after which water is added. Then the mass is pressed under a great pressure, shortened while moving on a conveyor belt and led through a furnace to accelerate the hardening process. The boards are then sanded to the required thickness and a water repellent additive is applied.
Finally, the boards are sawed to size.

To gypsum plasterboards, cellulose fibres are not added, but on the outer edges of the board it has sturdy cardboard. This acts as reinforcement. The production process is therefore slightly different; in the continuous process the calcium sulphate hemihydrate is placed on a layer of cardboard, after which it is distributed and compacted together with the application of the top layer of cardboard.

Mortars for calcium sulphate based screeds in the past 15 years have had a surge in replacing the cement based screed, which has to be finished off by construction workers on their knees. The distinctive advantage is namely that the mortar is self-levelling. The gypsum, before it is finished off, is burned at around 750-800 ˚C, where anhydrite is produced. Then it is usually ground to get the required fineness which is important for the stability and the fluidity of the mortar. During the grinding process additives are added. The resulting binding agent is mixed with a specially composed sand. The strength of the calcium based screeds is significantly higher than that of the cement based screeds. The material is supplied in compressive strengths to 80 N/mm2. The mortar is pumpable and pourable, so the physical load for the floor layers can be considered negligible.