How is glasswool made?

Glasswool is the most common form of insulation used in residential buildings in New Zealand and around the world. Glasswool is manufactured from raw materials, mainly sand, limestone and soda ash. Recycled glass is added and then the mixture is made into molten glass.

The molten glass is then fed into a spinner where it is fibreised into long thin strands of glasswool. At this point a binding agent is sprayed onto the glass strands to bind them together and help the insulation hold its shape.

The glasswool is then distributed onto a conveyor belt that flows down the production line through an oven. The insulation is then cut into rolls or segments and compression packed, ready for distribution.

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