Since semi-solid Flush Doors were first manufactured,
much research has gone into finding the best filling for the core.
All the properties of a good Flush Door depend on the design and
construction of the filling. The solution was evolved by a scandinavian
designer in the form of Placrol Core Doors. The new core consists
of hundreds of wooden spirals which are machined to a uniform size
and thickness and permanently resin-bonded on both sides, This is
the most economical revolutionary construction which has all the
Extra wood inforcement is provided on periphery
to support iron mongery and mortice locks, tower bolts etc, However
internal construction must be referred to or understood properly
before fitting door hardwares.