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
In Gypsum Board Suspended Ceiling Systems; It is the profile used in floor and ceiling in walled wall cladding systems.
In Gypsum Board Partition Systems, it is the profile applied horizontally.
It is a joint filler plaster used to fill joints in gypsum plasterboard joints.