Blown insulation is a great option for improving the comfort and efficiency of your home. It delivers seamless coverage with strong thermal R-values and is perfect for retrofitting existing walls, as it can be installed without removing linings. It also offers excellent acoustic properties, reducing noise while keeping warmth in. But have you ever wondered how blown insulation is manufactured? 

The Manufacturing Process from Glass Bottle to Insulation 

The process begins with recycled glass bottles and other natural raw materials, which are melted down and refined. These are then spun into fine fibres and treated to create a product that is safe, durable, and effective for use in homes. 

Each bag of blown insulation contains the equivalent of over 45 recycled glass bottles. Let’s take a closer look at how manufacturers transform these materials into high-quality insulation. 

1. Gathering and Preparing Raw Materials 

The process begins at the batch plant, where workers deliver and store raw materials such as sand, soda ash, borax, and dolomite. Up to 80% of the mix comes from recycled glass, known as cullet. This comes in two forms: 

• Plate glass – sourced from windows and car windscreens 

• Container glass – from bottles and jars 

Workers offload the raw materials into storage silos, where they are held until needed. The batch plant automatically measures and mixes the correct quantities of each ingredient before feeding them into the furnace. 

2. Melting the Glass 

The furnace operates at an intense 1,400°C, using a combination of gas, oxygen, and electric boost to melt the raw materials into a bath of molten glass. Unmelted batch materials float on the surface, while powerful gas-oxygen burner flames provide about 70% of the heat. 

After melting, the glass travels through electrically heated canals, which maintain the right temperature and viscosity for fibre production. 

3. Creating the Fibres 

To create the fibres used in blown insulation, the molten glass is rapidly spun through a hot spinner. Centrifugal force pushes the molten glass through thousands of tiny holes, creating fine glass fibres. As the fibres emerge, hot air blows them downward, stretching them further. Compressed air then determines the fibre length, while cooling water prepares them for the next stage. 

4. Applying the Silicone Emulsion 

Unlike traditional insulation rolls or batts, blown insulation does not require a binder. Instead, a silicone emulsion is applied to help the insulation maintain its shape and effectiveness once installed. 

The system evenly distributes the fibres across a conveyor to maintain consistency in density. Quality control teams monitor glass temperature and use CCTV surveillance to ensure the highest standards throughout production. 

5. Environmental Considerations 

The manufacturing process incorporates stringent environmental controls. Electrostatic precipitators remove pollutants from exhaust gases, and emissions monitoring instruments ensure compliance with environmental standards. The stacks emit very little, mostly steam, which reflects the eco-friendly nature of the process. 

Why Choose Blown Insulation for Your Home? 

Blown insulation provides seamless coverage, eliminating gaps and creating great thermal performance. Its fast and non-invasive installation makes it an ideal solution for retrofitting older homes without major disruptions. Designed to be moisture-resistant, it helps prevent mould and damp issues, contributing to a healthier living environment. Made from up to 80% recycled glass, it is a sustainable choice that supports eco-friendly building practices. Additionally, blown insulation improves energy efficiency by reducing heating and cooling costs, keeping homes comfortable year-round while lowering energy bills. 

Contact Absolute Energy Today 

If you’re looking to improve your home’s insulation, we are here to help. Whether you have a question about your home’s insulation or want a free quote, our team is ready to assist. Get in touch today and make your home more comfortable and energy-efficient with high-quality blown insulation.