The main applications for gypsum based construction materials are plasters (hand or machine applied), trowelling compounds, joint fillers and adhesives.
Gypsum is a well-established construction material for interior applications. It offers good workability and its setting time can be adapted for every application as required. Gypsum building materials generate a comfortable living atmosphere due to good humidity balance. Additionally, gypsum shows excellent fire resistance. However, it is not water resistant, therefore only interior use is possible. Combinations of gypsum and hydrated lime are very common in plaster formulations.
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Hand applied plasters
Gypsum based hand plasters are used for smaller areas as well as during renovation. They are stirred either by hand or with a machine and applied manually, usually with a trowel. Gypsum based hand or bonding plasters are less delayed than gypsum based machine plasters.
Gypsum based and gypsum-lime based machine spray plasters are mixed and applied in continuously working plastering machines. They are used for a highly efficient coating of walls and ceilings and applied in one layer (ca. 10 mm thick).
Gypsum based jointing compounds are used for filling the joints between gypsum plasterboards or gypsum fibre boards. Setting times vary considerably depending on the geographical region and application.