20 mm hand crimping refers to the process of manually applying a crimp to a headspace vial using a hand crimper tool, It has a rounded bottom and a narrow neck that accommodates a septum for sealing. The headspace vial allows for the analysis of volatile and semi-volatile compounds by capturing the gas phase above a sample.To seal a headspace vial, a hand crimper tool is used. The hand crimper is a specialized tool designed to apply even pressure around the vial’s neck to create a secure seal.