... grade 4-5 4.EN11611, EN11612 "Yijia" preventing fire dungarees for protection workers :100% Cotton FR , preventing fire, fire resistant, fireproof - 200g/m2 Front buttons covered ... operations, petrochemicals, industrial furnace and other workplace concering mechanic About preventing fire dungarees for protection workers fabric: Fabric composition100% cottonFunctionflame retardant/flame proof ...