1. The appearance of the plastic caps: full molding, complete structure, no obvious shrinkage, bubbles, burrs, defects, uniform color, anti-theft ring connection bridge without damage, and the inner pad should be flat, no eccentricity, damage, impurities, flash and Alice song;

2. Opening torque: The maximum torque required when opening the packaged plastic anti-theft cap, the opening torque is between 0.6N.m and 2.2N.m;

3. Fracture torque: torn off the anti-theft ring, the maximum torque required, the breaking torque is not greater than 2.2N.m;

4. Sealing performance: non-gas beverage plastic caps 200kpa does not leak, 350kpa does not remove, gas-containing beverage cap 690kpa does not leak, 1207kpa does not decap (new standard);

5. Thermal stability: no cracking, no deformation, no leakage (no leakage);

6. Drop performance: no leakage, no cracking, no fly off.

7. Gasket grease performance: clean bottle filled with distilled water sealed with a cap, placed in a thermostat at 42 °C laterally for 48 hours, from the time of placement every 24 hours to observe whether the liquid level in the bottle, The test was terminated if grease appeared.

8. Leakage (leakage) angle: The packaged sample has a straight line between the plastic caps and the plastic bottle support ring. Rotate the plastic cap and closure counterclockwise slowly, stop immediately when it has leaked or leaked.  Measure the angle between the plastic cap label and the support ring. (The national standard requires the safety opening performance. The original standard requirement is less than 120°. When the bottle is completely unscrewed, the cap does not fly off.)