Bulk insulation mainly resists or slows down the transfer of heat by conduction and convection, relying on pockets of trapped air or low conductive gasses within its structure. Its thermal resistance is essentially the same regardless of the direction of heat flow through it. For bulk insulation, R values are provided for a specific thickness and density of material at a given temperature. The thicker the insulation, the higher the R value for that product.Bulk insulation includes materials such as glass fibre, slag wool, rock fibre, cellulose fibre, polyester fibre, polystyrene, polyurethane and polyisocyanurate. Each product has a material R-value for a given thickness, density and temperature. The products are available in either a flexible blanket or rigid board.
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