Patent ID: 8227068

Claim:
A ceiling tile comprising, a) a display layer formed of plastic sheet material having a multi-sided polygonal periphery, a display surface displaying a design pattern, a color, a color pattern, or a decorative relief pattern, and a non-display surface, the display surface having a marginal peripheral portion and constituting the viewable surface of the ceiling tile when the ceiling tile is installed in a ceiling, b) a rigid core layer formed of gypsum material having the multi-sided polygonal periphery, a first surface and an opposite second surface, said first surface being bonded to and covered by the non-display surface of said display layer such that the display layer forms a gas tight seal on the rigid core layer at the first surface of the core layer, c) a light reflective back layer formed of a metallic material having the multi-sided polygonal periphery, an exposed light reflective surface and an opposite non-exposed surface, the non-exposed surface being bonded to and covering the second surface of said core layer such that the light reflective back layer forms a gas tight seal of the core layer at the second surface of the core layer, the exposed light reflective surface having a marginal peripheral portion, and d) a leak tight tape formed of plastic material enveloping the multi-sided polygonal periphery of the rigid member, said leak tight tape overlapping the marginal peripheral portion of the display surface of the display layer and the marginal peripheral portion of the exposed light reflective surface of the back layer such that the leak tight tape forms a gas tight seal of the rigid core layer at the multi-sided polygonal periphery of the core layer.