18mm magnetic thread cap. It is easy to use and does not require any other tools, such as capping machine and cap opener. The precise thread ensures the air tightness between the vial and the cap. Magnetic nut can be widely used in various SPME and headspace analysis.
18mm cap, can be matched with headspace vial. These sample vials can also be used as storage vials. Precisely machined threads ensure that the seal is maintained at all times. It is perfectly matched with matching 18mm magnetic metal screw cap and PTFE/silicone septum. The caliber of this series of headspace vials is 18mm, and the size of 20ml is 22.5*75.5mm.