| abstract |
A first layer, a honeycomb layer overlying the first layer, and a second layer overlying the honeycomb layer, wherein the first and second layers are fibrous sheets, and the first and second layers At least one of which is a semi-incombustible fibrous sheet material comprising cotton fibers, wherein the cotton fibers comprise 90% to 100% by weight of cellulose, and a method of making the same. |