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How Glass Wool Is Made?

Jul. 11, 2022

In today's evolving world, materials used for insulation are sweeping the globe in terms of acoustics, thermals, and more. These form part of the enhanced exterior, interior, and decorative comfort. Glass wool is an insulating material that has many applications in the home, whether it is part of a roof, false ceiling, or drywall. According to ' John Wiley & Sons ' (authors of Webster's New World College Dictionary), "Glass wool is finely interwoven glass fibers used as a filter and insulating material."


What is glass wool?

Glass wool insulation is made from borosilicate glass and contains important ingredients such as silica sand, recycled glass, and fixing agents. Glass wool is an insulating material consisting of intertwined, flexible glass fibers that are allowed to "wrap" around the air, resulting in a low density that can be changed by compression and binder content. Glass wool can be a loose-fill material blown into the attic or sprayed with reactive binders on the underside of structures, panels and boards and can be used to insulate flat surfaces such as cavity wall insulation, ceiling tiles, window walls, and ducts. It is also used to insulate ducts and for sound insulation.


According to Zhang Haimei, editor-in-chief of "Civil Engineering and Construction Materials," "Glass wool is a fibrous material made from raw or broken glass melted down. It has two types: loose wool and superfine wool. Loose wool is used to make asphalt-bonded glass blankets and glass wool sheets. In addition, it is used for insulation in exterior protective structures and pipes.

MLEX Glass Wool

 MLEX Glass Wool

Glass wool production

Glass wool is made from a thick layer of glass fibers that are cured in an oven at 200°C to bond the strands together and thus reduce the thickness of the sheet. In addition, it is melted in an electric furnace to 1100°C and then conditioned in a gas furnace. It is a furnace product made from molten glass. From this molten glass, fibers can be spun. The process involves high-speed spinning of the molten glass, similar to the method used in candy production. A binding agent is incorporated into the spinning process.


No CFCs or HCFCs are produced during the production process. the fibers are aggregated in a collection chamber in the form of mats and then transferred to an oven where they are cured to the desired thickness and density under controlled conditions. It is custom made in rolls or sheets. Likewise, it is used as a component to be sprayed or applied on surfaces to be insulated. It is a versatile material used for insulation of walls, roofs, and floors. Glass wool should always be kept dry during installation, as increased moisture content may lead to a significant increase in thermal conductivity.


Glass wool decorative sound-absorbing panels

Glass wool decorative acoustic panels are ceiling decorative panels made of glass wool as the main raw material, adding a certain amount of binder, moisture-proofing agent, anti-corrosion agent, etc., through the process of pressing, drying, etc. And finishes, etc. Its surface treatment generally uses PVC film and aluminum foil with patterns and designs. Since the film and aluminum foil have a large number of openings, the sound absorption effect is good. Its products are light, sound-absorbing, etc., fireproof, heat preservation, insulation; decorative, beautiful, easy to construct, etc. Glass wool decorative sound-absorbing panels can be used for the indoor ceilings of hotels, halls, theaters, concert halls, stadiums, conference rooms, ships and residences.

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