Patent ID: 7087300

Claim:
A heat and cut resistant yarn comprising: at least one fire retardant and heat resistant strand that is composed of a blend of: fire retardant and heat resistant polymer fibers having an LOI of at last about 50 and that does not burn when exposed to heat or flame having a temperature of about 3000° F.; and strengthening fibers that include at least one of polybenzimidazole, polyphenylene-2,6-benzobisoxazole, modacrilic, p-aramid, m-aramid, a polyvinyl halide, wool, fire resistant polyester, nylon, rayon, cotton, or melamine; and at least one strengthening filament selected from the group consisting of metallic filaments, high strength ceramic filaments, and high strength polymer filaments, wherein the at least one fire retardant and heat resistant strand and the at least one strengthening filament are combined in a manner so that the heat resistant yarn has increased strength compared to a yarn consisting exclusively of the at least one fire retardant and heat resistant strand.