Glass bottles are subject to various external forces during transportation, stacking, and daily use. We conduct mechanical tests that simulate actual scenarios to prevent product failures during end-use.

Leakage test: Use a negative pressure seal tester to place the bottle under a specific vacuum degree to observe whether there is leakage or bubble generation to ensure that the contents will not leak or be contaminated.

Drop test: This test simulates an accidental drop that may occur during transportation and handling. A bottle filled with contents (or a substitute) should not break or leak after being dropped from a specified height (such as 1 meter or 1.5 meters) onto a hard surface.

Stacking Test: To simulate warehouse stacking conditions, we apply a 5 kg weight (or the equivalent of 10 layers of bottles) to a stack of filled bottles for 72 hours. The bottles must show no deformation, collapse, or seal damage.

Bottle Cap Torque Test: A torque meter is used to measure the force required to open and close the bottle cap (typically 0.5-2.0 N·m, depending on the bottle size). This ensures that the force prevents leakage while allowing easy opening and closing for the end user.

Pump Head Functionality Test: For bottles with pump heads, the dispensing volume (with a tolerance of ±5%) and the stability of the dispensed liquid over 100 cycles are tested. "Dry pumps" (no liquid discharged) and uneven dispensing are not permitted.

Finally, we test the bottle's ability to fulfill its designed function based on its specific intended use:

Ease of dispensing: For squeeze bottles, measure the force required to dispense liquid (ideal for adults is 30-50 Newtons); for pump-top bottles, ensure that excessive pressure is not required.

Reusability (if applicable): For refillable bottles, perform a "clean-fill-seal" cycle test at least 50 times to ensure there is no wear on the bottle threads, cap, or pump tip.

Label adhesion: If the bottle has a label, test its resistance to water, oil, and friction to ensure it remains intact in humid or oily environments (such as bathroom skincare glass bottles).