This document specifies the requirements and inspection rules for random carboxyl liquid acrylonitrile-butadiene rubber (also known as random carboxyl liquid nitrile rubber, code L-XNBR), describes the corresponding test methods, and stipulates packaging, marking, Transportation and storage matters. This document applies to L-XNBR, which is copolymerized by free radical emulsion at a certain temperature with butadiene, acrylonitrile and acrylic acid or methacrylic acid using sodium dodecyl sulfate as the emulsifier.