It is a special Gypsum Board® type which has the ability to hold X-ray rays and also has high sound insulation.
Product Standard: EN 520 – TYPE DF
It is used to protect outer corners against impacts and to obtain a smooth surface in drywall applications.
Safeboard is a joint filler used in joints of gypsum board types.
Knauf Fireboard® is a joint sealant used in joints of plasterboard types.