Abstract: An ultralow density fire-retardant fiber composite foam formed material including at least 60-80% by weight of lignocellulosic fiber and/or regenerated cellulose fiber, and 0-10% by weight of foaming agent, wherein the material further includes an amount of weight of fire-retardant agent or wherein an amount of the cellulose and/or wood fiber has fire-retardant properties, wherein the fire growth index of the fiber composite is <120 W/s and the total heat release of the fiber composite is <7.5 MJ in accordance with Single Burning Item method (EN 13823), and wherein the density of the ultralow density fiber composite foam formed material is <150 kg/m3. Corresponding method of manufacture and products are also presented.

Abstract: In a method for manufacturing fibril cellulose, cellulose based fibre raw material is processed mechanically in a refining gap for separating fibrils. The fibres to be refined are subjected to the action of a surface roughness Ra provided by grits elevated from a refining surface delimiting the refining gap, said surface roughness being lower than 3 ?m, advantageously lower than 2 ?m. The refining surface is formed by spraying grits and binder onto a substrate.