A process for utilizing wound packages of off-color filament yarn by: a) obtaining a plurality of wound packages of off-color filament yarn: b) classifying the plurality of wound packages, based on a pigment in the filament, into sets of wound packages; c) converting a first set of wound packages into first staple fibers; d) converting a second set of wound packages into second staple fibers; e) mixing the first and second staple fibers of c) and d) to form an intimate blend of off-color staple fibers;
wherein the first staple fibers are at least 55 weight percent of the off-color staple fibers in the intimate blend of off-color staple fibers.

A fireproof material used for a lithium battery module and a method for producing the same are provided. The fireproof material has a stacked structure formed by stacking multiple layers of mesh structures. Each layer of the mesh structures includes a plurality of first fibers and a plurality of second fibers. The first fibers are oxidized fibers, and the second fibers are silicate fibers. Each layer of the mesh structures is formed by interweaving the plurality of first fibers and the plurality of second fibers. The multiple layers of the mesh structures of the fireproof material have a stacked layer number of between 5 layers and 20 layers and a stacked layer thickness of between 0.3 mm and 5 mm. The fireproof material has a density of between 0.05 g/cm.sup.3 and 2 g/cm.sup.3 and a thermal conductivity of between 0.01 W/(m.Math.K) and 0.8 W/(m.Math.K).

A fireproof material used for a lithium battery module and a method for producing the same are provided. The fireproof material has a stacked structure formed by stacking multiple layers of mesh structures. Each layer of the mesh structures includes a plurality of first fibers and a plurality of second fibers. The first fibers are oxidized fibers, and the second fibers are silicate fibers. Each layer of the mesh structures is formed by interweaving the plurality of first fibers and the plurality of second fibers. The multiple layers of the mesh structures of the fireproof material have a stacked layer number of between 5 layers and 20 layers and a stacked layer thickness of between 0.3 mm and 5 mm. The fireproof material has a density of between 0.05 g/cm.sup.3 and 2 g/cm.sup.3 and a thermal conductivity of between 0.01 W/(m.Math.K) and 0.8 W/(m.Math.K).