| 摘要 |
<p>A door frame (10) having excellent fire-resistance, flexural strength and screw holding properties is fabricated from gypsum fiberboard, specifically a gypsum fiberboard having a density of at least 60 lbs./cu ft., a flexural strength of at least 30 lbs. (1/2' thick material), and a screw holding capability of at least about 400 lbs. A preferred gypsum fiberboard material for fabrication of the door frame (10) comprises a composition containing a substantially uniform dispersion of solids including by weight about 65 % to 90 % set gypsum, about 7 % to about 30 % pulped paper, up to about 9 % binder, and about 8 % to 2 % inorganic fiber. A wood veneer (28) is preferably applied to the visible faces of the gypsum fiberboard door frame members by means of adhesive (30).</p> |
