Nov. 22,

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Glass wool is an insulating material made from glass fibres that are arranged using an adhesive to form a wool-like texture. The process traps many small air pockets between the glass and these result in high thermal insulation properties. Glass wool is produced in rolls or sheets and has different thermal and mechanical properties. 

It can also be produced as a material that can be sprayed or applied to the surface to be insulated. The modern method of producing glass wool was invented by James Slayter while working for the Owens-Illinois Glass Co. He first patented the new process for manufacturing glass wool in .

What is glass wool?

Glass wool is an insulating material made from glass fibres called borosilicate glass, which are arranged with an adhesive to form a wool-like texture.

What is glasswool used for?

Glasswool is used for partitions, roofing, ceilings/vaults, flooring, metal construction as well as industrial and automotive insulation.   

Formaldehyde-free Glass Wool

How does glasswool work?

Glasswool is used as an insulation and coating that saves energy by effectively reducing the rate of heat transfer through the components of a house. glasswool provides insulation that protects the building envelope, keeping heat inside in the winter but allowing it to escape in the summer to improve comfort and save energy.

Is glass wool the same as fibreglass?

Both are the same component, as Glasswool can sometimes be referred to as fibreglass insulation or fibreglass.

In general, the thermal conductivity of glasswool is 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 material of a specified thickness (in millimetres) due to a temperature difference.

Glasswool production process

Glasswool is made primarily from sand and recycled glass. Its extraordinary thermal properties help to save energy and combat climate change.

The manufacturing process of Glasswool is as follows.

1. Batch

The main components of Glasswool are sand, soda ash, limestone and recycled glass; stored in silos. The process starts with weighing, mixing and pouring the components into the furnace.

 Centrifugal Glass Wool 

2. Melting

The mixed components are then melted in an electric gas furnace at temperatures in excess of 1,400°C.

3. Fibrillation

The liquid glass obtained from the furnace is then passed through the feeder to the fibrillator where, with the help of a centrifugal spinner, it is pushed through small holes - forming fibres. These fibres are sprayed with binder and shaped into blankets.

4. Moulding

The fibre blanket is passed through the curing oven, where it is compressed to the required thickness.

5. Cutting

After the final thickness has been obtained, the blanket is cut to the required width. The trimmings obtained during cutting are eventually recycled to avoid waste.

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6. Packaging

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

7. Palletizing

As required, the glass wool can be compressed to ten times its volume for palletizing. The total of 36 rolls of glass obtained during this process can be packed on a pallet. (soaking pit)

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Most Common Misconceptions about Glass Wool Insulation

Bring Down the Prejudices and Insulate!

It is not uncommon to hear many potentially negative things about certain insulation products. Although we believe that it is always &#;better safe than sorry&#; and that anyone considering installing insulation should gather all important facts, including ones regarding potential health hazards, it is equally important to get your facts straight. Namely, although there are some materials that were once used as insulators (such as asbestos) and are proven to be very dangerous why their use has been forbidden by applicable regulation, we can often hear different stories about the threat that some materials often used nowadays, pose. What is even more important, often these misconceptions and myths are a reason why someone does not choose a certain material or even decides not to insulate at all. Since being one of the most commonly used insulation material, we shall here address some of the most common misconceptions about glass wool insulation.

Glass wool insulation is an insulation material made from recycled glass, lime stone, soda ash and sand which are exposed to high temperatures and bounded by using some kind of resin in order of providing a level of tear strength, whereas some brands now use formaldehyde-free binder, in order of producing a more eco-friendly products. The material consists of a number of fibres that made in to rolls, slabs or rigid slabs, depending on the density of the material and its application. Although lightweight, this type of insulation offers great density, strength and durability and is used not only for thermal but also acoustic insulation. Another potential strength of the product lays in its versatility since it can be used on a number of surfaces including loft, cavity walls and floor insulation. It is often chosen when operating in relatively high temperatures since it can withstand temperatures up to 230º C and is classified as non-combustible. What improves its eco-side is the fact that it is recyclable and can be reused if maintained in good condition.

Once we have considered some basic characteristics, it is time to move on the most common misconceptions about glass wool.

Misconception No.1 &#; Glass wool is radioactive and contains asbestos

As mentioned in the introductory of this article, asbestos is proven to have serious impacts on health and can, in some severe cases and continuous exposure, even cause lung cancer, why although very commonly used in the past century and can still be found in some older buildings, is now forbidden by applicable regulation and thus cannot be used not only independently but neither as a component in other products and materials.

This further on means that glass wool insulation is not forbidden in any country today, but on the contrary, is one of the most commonly uses insulation and a top seller in many countries around the world including Germany and USA.

Also, this insulation material cannot be considered radioactive since, apart from sand which has very low level of natural radioactivity, it contains no other radioactive substance, but presents a very small percentage of the total radioactivity we receive from natural sources through the year.

Misconception No.2 &#; Glass wool presents a health hazard

When speaking of potential health hazards of glass wool insulation, people usually refer to the itching that could occur when bear skin comes in contact with the fibres and dust produced during installation. It is very important to underline that, although some irritations to the skin can occur, these are not allergic reactions but are purely mechanical, meaning that the problem can easily be dealt with some water. However, as when dealing with any material that can produce dust upon installation, it is advised to use basic protective equipment, such as protective gloves and a face mask. Long sleeves and legs can also do the trick, just as proper ventilation, once the job is done.

Simply due to all the previously mentioned concerns about glass wool, the product was very thoroughly examined and studied over the years, whereas a few thousand available studies have shown that this type of insulation is safe to produce and use. These studies have also been followed by proper certifications which prove that the material is not classified as hazardous.

Misconception No.3 &#; Glass wool insulation is dangerous for the environment

Final misconception regarding glass wool insulation refers to its environmental impact, shown through the amount of energy that is required to produce the material. Although it is often believed that large amount of energy is invested into production of this type of insulation which only results in more fossil fuel burned and more toxic gasses released into the atmosphere. However, here it is very important to look at the whole life cycle of insulation, from the manufacturing process until the end of its life span.

Basically, although certain amount of energy is used to produce the material, once installed, it will also save a significant amount of energy throughout its life span, thus maintaining the balance. In the end, with glass wool insulation properly installed, you will help save more energy than it is required to produce the product in the first place, making it an energy efficient mean of adding your home to the list of green buildings. 

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