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Where Does Glass Wool Come From?

Jun. 20, 2022

Glass wool is mainly made of sand and recycled glass. Its extraordinary thermal properties help save energy and combat climate change.


The manufacturing process of glass wool is as follows.

1. Batch

The main components of glass wool are sand, soda ash, limestone, and recycled glass; stored in silos. The process begins with weighing, mixing, and pouring the components into the furnace. (Lintel)


2. Melting

The mixed components are then melted in an electric gas furnace at a temperature of over 1,400°C.

3. Fiberizing

The liquid glass obtained from the furnace is later passed via a feeder to a fiberizing machine, where it is propelled through tiny holes with the help of a centrifugal spinner – creating the fibers. These fibers are sprayed with a binder and shaped into a blanket.

 Formaldehyde-free Glass Wool

Formaldehyde-free Glass Wool

4. Forming

The blanket of fibers is passed through a curing oven, which is compressed to desired thickness.


5. Cutting

After the final thickness is obtained, the blanket is cut to the desired width. The edges obtained during cutting are eventually recycled to avoid waste.


6. Packaging

Prior to packaging, the mats are rolled with the help of a rolling machine equipped at the end of the line. A stacker is provided for the boards.


7. Palletization

As per the necessity, the glass wool can be compressed up to ten times it is the volume for palletization. In total 36 rolls of glass obtained in the process could be packed onto a single pallet. (Soak Pit)

  Glass Wool    

 Centrifugal Glass Wool 


Frequently asked questions about glass wool

1. What is glass wool?

Glass wool is an insulating material made of glass fibers called borosilicate glass, arranged with an adhesive to form a wool-like texture.


Glasswool provides the industry with high-quality insulation materials for different applications and temperatures that are flexible to mechanically resistant, lightweight, and highly compressible wool.

2. What is glass wool used for?

Glass wool is used in partitions, roofs, ceilings/vaults, floors, metal buildings, and industrial and automotive insulation.


3. How does glass wool work?

Glass Wool is used as an insulation and coating that saves energy by effectively reducing the rate of heat transfer through the components of the house. Glass wool provides insulation that maintains the building envelope, keeping the heat in during the winter, but allowing us to vent the heat in the summer to improve comfort and save energy.

MLEX Glass Wool

 MLEX Glass Wool      


4. Is glass wool the same as fiberglass?

Both are the same ingredient as glass wool can sometimes be referred to as glass fiber insulation or fiberglass.


5. Is Glasswool banned?

Glasswool is increasingly popular and poses no health or environmental hazards. It is one of the most commonly used insulating materials and has many advantages.


6. Thermal conductivity of glass wool

In general, the thermal conductivity of glass wool ranges between 0.023 and 0.040 W/m∙K. Thermal conductivity is defined as the amount of heat (in watts) transferred through the squared area of any given thickness (in millimeters) of material due to temperature differences.

For more information about the glass wool properties, welcome to contact us at +86 22 2626 2121 or write to us at We will be happy to help you out!

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