**4. Conclusions**

In this study light gypsum-based materials were obtained using hydroxyethyl methyl cellulose (HEMC) and sodium bicarbonate. To reduce the setting time of gypsum binders with sodium bicarbonate addition, FGD gypsum was also added to the mixture.

The following conclusions can therefore be drawn:


**Author Contributions:** Conceptualization, C.D. and A.B.; Investigation, C.D., S.C., A.I.N.; Methodology: C.D. and A.B.; Supervision, A.B. and S.S.; Writing—original draft, C.D. and A.B.; Writing—review & editing, A.B. and S.S. All authors have read and agreed to the published version of the manuscript.

**Funding:** The SEM analyzes were possible due to EU-funding project POSCCE-A2-O2.2.1-2013-1/Prioritary Axe 2, Project No. 638/12.03.2014, ID 1970, SMIS-CSNR code 48652.

**Conflicts of Interest:** The author declares no conflict of interest.
