Materials Solutions Newsletter Signup
Get the Engineering360
Stay up to date on:
Making products that are lighter, stronger and last longer, and new materials that improve performance.

How is an Alumina Bubble Made?

Product Announcement from Washington Mills Electro Minerals Company

How is an Alumina Bubble Made?-Image

How is an Alumina Bubble Made?

Hollow insulating spheres made from high purity alumina are often referred to as bubble alumina or alumina bubbles. Fused bubble alumina is made when the raw materials (high purity Bayer process alumina) are heated to an extremely high heat (2000°C) in an electric arc furnace. The molten material is then poured out of the furnace and fed through a high pressure air stream. The stream of molten particles cools rapidly as it hits the air. The surface tension causes the molten particles to form perfect firm spheres in the process. The hollow sphere or alumina bubble consists of an open core, making the bubble lightweight and giving it superior insulating properties for refractory applications.

For more information on our lightweight refractories and Washington Mills' bubble alumina, DURALUM AB, please contact Washington Mills today at or 508-839-6511.