Devi Enterprises offers Glass Wool Insulation which is made from fibreglass, which is layered and arranged to produce a similar texture to that of wool. The way it’;s made is a bit like the way fairy floss is spun; molten liquid glass made from sand and recycled glass products is pulled through a superfine mesh by centrifugal force, and the tiny strands dry and cool on contact with air. The individual fibres are held together with a binding agent, which helps to hold glass wool together and give it strength. Once it’;s made glass wool it is cut to size and packed in either rolls or panels (also called batts’;) for transport. The fibres in glass wool work to trap air between them and stop airflow. Heat passing through the fibres therefore can’;t penetrate very, far as the material itself does not conduct heat very well and the air pockets it contains are isolated from each other. The more compressed the batts are, the less resistant to heat they become, as they will not trap air as effectively.