Standard Test Methods For Plastic Caps

The national standard GB/T17876-1999 specifically specifies the testing issues for plastic anti-theft bottle caps, such as the opening torque force, thermal stability, drop resistance, leakage and sealing performance, etc. The evaluation of sealing performance and bottle cap opening and tightening torque is an effective way to solve the sealing performance of plastic anti-theft bottle caps. According to the different uses of bottle caps, there are different regulations for the measurement methods of non gas caps and gas caps. The sealing cap (excluding the gas cap) needs to be cut off from the anti-theft ring (strip) of the bottle cap, used for sealing at a rated torque of not less than 1.2NM, tested with a sealing tester [1], pressurized to 200kPa, maintained underwater for 1 minute, and observed for air leakage or detachment; The breathable cover (including the air cover) is pressurized to 690kPa and kept underwater for 1 minute to observe if there is any air leakage. Then, the pressure is increased to 1207kPa and kept for 1 minute to observe if the plastic cover is dislodged.