The Unibar family of cast irons are produced using the horizontal continuous casting method.

As can be seen in the schematic diagram below, the process is a “closed system”.
The water cooled die is assembled onto the front of the receiving furnace allowing
the liquid iron to enter the die without coming into contact with the atmosphere.

The process begins with a dummy block which, when attached to a series of
starter bars, is inserted into the water cooled graphite die. The graphite die will be
machined to the shape or profile to be produced.

As the bar is pulled horizontally, the metal flows more uniformly and is always
subjected to a much higher ferrostatic pressure than in sand castings.
This, combined with rapid cooling in the die, ensures a cleaner and homogeneous
structure as well as excellent structural cohesion throughout the section.

As a result, the outside rim (periphery) is solid at the moment it leaves the die and
cooling system while the core remains liquid. Due to the fast cooling, the periphery
has very fine graphite in a predominant ferritic matrix with a high material cohesion;
much higher than is obtained with sand casting.