Chromatopak Analytical Instrumentation [India] Pvt. Ltd. Supplies Shell Design Auto Sampler Vials. Chromatopak Analytical Instrumentation [India] Pvt. Ltd. Manufactures columns, consumables and accessories for HPLC, GC, IC, SPE etc. Shell Design Auto Sampler Vials is used for headspace sampling. Shell Design Auto Sampler Vials is used for low volume glass inserts. This vial is also available in snap-top, crimp-top and screw-top design. Plastic [Polypropylene] vials can also be offered. This vial has borosilicate glass which is USP Type I, class A in clear and amber.