The transformation of ROCK to stone wool insulation

14 February 2017

Ever wondered how ROCKWOOL transforms ROCK into insulation? This week we focus on the origins of stone wool insulation. Last week, we discussed the history of this material. Now, we turn our attention to the production process, which sees the base rock transform into insulation.

ROCKWOOL UK Factory Employees

The production process for stone wool is a technological replica of the inside of a volcano that spins and cools lava in a controlled environment.

The process begins with the base rock being graded and crushed along with other carefully selected ingredients, such as, recycled stone wool to form a raw material. This charge, as it is known, is then melted in a cupola furnace at a temperature in excess of 1500°C. As the liquid rock pours from the furnace, nature’s process is recreated. Lava flow is directed into a chamber where it is spun and transformed into rock strands and stone wool.

The spun strands are then mixed with a binder. Trillions of these strands are collected to form a matt which is then cured. Cut to various lengths and thicknesses it is then prepared and packaged to form an extensive range of products for a wide variety of applications.


To understand this process further, watch the ROCKWOOL Origins video.