WHAT IS ROCKWOOL:

Rockwool is manufactured by fiberizing molten rock, primarily diabase. The rock is melted at a temperature of approximately 1450ºC, resulting in a growing substrate, which is sterile, free of organic matter, such as weed seeds, hidden diseases and other harmful components.

Slag is a residual product from the process of making iron. The slag originates from Iscor Newcastle, transported by rail to the processing plant, where it is offloaded into bunkers. Slag is the main burden that gets melted in the process of producing rockwool.

Coke and slag is weighed and mixed in a specific ratio and is then introduced into the furnace, where it is melted at an approximate temperature of 1450ºC.

The molten slag is guided onto four spinning wheels or fiberizers, which rotate in opposite directions. This centrifugal process produces fibers of different lenghts. An atomized binder solution is added to the fibers to cure them and in so-doing keeps the fibers together. The cured fibers are then collected and are ready for further processing.