Tillman® Fire Resistant FR7A® Fire Resistant Cotton FR Cotton Sleeves. 9 oz, green flame resistant cotton sleeves. 18” total length, 14” FR cotton length. 2 1/4” external elastic at both ends. Made from flame resistant, 100% cotton Westex® FR7A®. 9 oz flame resistant 100% cotton fabric meets ASTM D6413-10. ASTM D6413-10 is used to determine a pass/fail criteria for ASTM F1506, which requires a maximum char length of 6 inches. Offers protection from sudden flame exposure, light duty welding and sparks.