sources which may ignite thepaper. New GLASdek will not readily ignite unless exposed to a direct flame or extremely high temperatures for an extended period of time CELdek is made from... a special high cellulose material, which is impregnated to resist degradation. CAUTION: Do not expose to sparks or flame -- the material is flammable when dry. GLASdek is made from... glass matt and rigidifying agents. GLASdek is fire rated with UL900, Class II for depths up to 12". Wide Range of Cooling Applications The CELdek unique cross-fluted design...