This standard specifies the terms and definitions, structural types and dimensions, classification, codes and markings, basic requirements, and technical requirements of plug-in pneumatic pipe joints (hereinafter referred to as pipe joints) used for plastic pipes with an outer diameter of 3 mm to 12 mm. , test methods, inspection rules, labeling, packaging, transportation, storage and quality commitment. This standard is applicable to pipe joints (except embedded pipe joints) used in pneumatic systems with a working environment temperature of -20 ℃ ~ +80 ℃ and a working pressure of -0.09 MPa ~ 1.6MPa. This standard does not apply to air brake systems.