10ml headspace vial with aluminum crimp cap and Magnetic bimetal cover is designed for Gas Chromatography.
this 10ml GC vial is Flat bottom, which size is 22.5x46mm. As you saw in the pic, there are two different cap and septa to selection. Aluminum cap and Magnetic bimetal cover. Please choose the 10ml glass GC vial as your gas chromatography instrument requirement.