English to German Tech/Engineering Materials (Plastics, Ceramics, etc.)

XXX is particularly well suited to building envelope
applications such as wall cladding and panels, where
good colour flatness and gloss retention are important. -

the definition I got was: a flat paint refers to the gloss or sheen, so a surface that scatters or absorbs the light falling on it so as to be substantially free from gloss or sheen