High-density casein laminated pressboard Figeholm HDLC offers the best dielectric properties. It is made according to a special recipe from Figeholm Elboard® HD and laminated with casein glue. Casein glue is water-based, it has a higher moisture content of HDLC than HDLP.
Figeholm HDLC is preferable for use where the highest electrical stresses occur in the transformer, since the casein glue possesses dielectric properties similar to transformer oil, thus evening out the electric fields.