Mineral Fibre Cavity Wall Insulation Absolute Insulation are approved Installers of InstaFibre Cavity Wall Insulation Material. It is a glass mineral wool that leaves the factory completely prepared to be installed. No chemicals, water or adhesives need to be added at our warehouse or on the site. The material is yellow in colour and the texture resembles cotton wool. INSTABEAD Cavity Wall Insulation. InstaBead Cavity Wall Insulation is polystyrene bead cavity wall insulation. An air drying adhesive is used as a bonding agent to provide long-term stability to the insulant. InstaBead Cavity Wall Insulation is effective in reducing the U value (thermal transmittance) of external cavity walls. Knauf Ecose™ Technology Loft Insulation. Knauf Insulation's new glass wool made with Ecose™ Technology doesn’t look or feel like any insulation you've ever experienced, that’s because the natural brown colour represents a level of sustainability and handling never achieved before. The brown colour and 'super soft' feel comes from Ecose™ Technology, which combined with the same reliable thermal and acoustic performance you have come to expect from mineral wool. Ecose™ Technology combines the already outstanding performance of glass mineral wool with superior environmental credentials.