Hplc Vials Chromatography Consumables. Our major products are chromatography vials with closures, inserts, crimpers and syringe filters; Water analysis consumables such as COD test tubes, etc. Zhejiang Aijiren Technology, Inc. is a global supplier of life-science, chemistry, laboratory consumables, etc. Chromatography: Sample Preparation Workflow – Aijiren Tech Sci Acetonitrile, Optima Grade