Ground-up newspaper that is treated with fire-retardant.
cellulose insulation (Wikipedia)
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The word cellulose comes from the French word cellule, for a living cell, and glucose, which is sugar. Building insulation is low-thermal-conductivity material used to reduce building heat loss and gain, and reduce noise transmission. Cellulose insulation is plant fiber used in wall and roof cavities to insulate, draught proof and reduce free noise.