| 摘要 |
<p>This invention concerns a thin, lightweight panel board of density greater than 12 lb/ft.3 (pcf) composed of 55-75 wt.% siliceous material; 2.5-4.5 wt.% asphalt; 20-40 wt.% cellulosic material and 0.5-3 wt.% starch, which board exhibits superior strength and acoustical dampening at 1/5 to 1 inch thicknesses. The invention also relates to a process required for the production of said board.</p> |
