SHOT-FREE MILLBOARD

摘要

A millboard is asbestos-free and also is free of unfiberised material, or shot, which can cause miscrosopic defects in glass sheet. The millboard is suitable for use as float roll covering material. The millboard comprises between 5% and 25% by weight of a glass fiber; between 3% and 5% by weight of an organic fibre; between 45% and 65% by weight of a ball clay; between 0% and 20% by weight of bentonite; between 10% and 20% by weight of calcium carbonate; between 0% and 15% by weight of pyrophyllite; between 10% and 18% by weight of sodium silicate; between 5% and 10% by weight of starch; between 0% and 10% by weight of colloidal silica; and between 0% and 15% by weight of hydrated lime.