Chromatopak Analytical Instrumentation [India] Pvt. Ltd. Supplies Gas Chromatography Packed Column. Chromatopak Analytical Instrumentation [India] Pvt. Ltd. Is the manufacturer of columns, consumables and accessories for HPLC, GC, IC, and SPE etc. Gas Chromatography Packed Column is available in a variety of stationary phases. Gas Chromatography Packed Column has been preconditioned with ultra high purity nitrogen and it is ready-to-use. These packed columns are compatible for use on most GCs available in India. It is made to order.