There are stains and impurities (≥0.2mm2) in the <br><br>acupuncture ring or the contact surface with the content; there are bubbles in the acupuncture ring or on the sealing surface, <br><br>stains, impurities (≥0.2mm2) on the surface of the crack , glue thread, glue chips, sponge , Burrs, rough necks of plugs, <br><br>defects and jagged edges caused by obvious lack of glue , marks caused by molds, and obvious uneven color. <br>Aluminum inner diameter: <br>aluminum material thickness: <br>aluminum-plastic material mechanical properties*
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