HPLC Columns made in Japan by GL Sciences Our HPLC columns are manufactured in Japan under strict control, assuring the quality of the columns. InertSustain Series are the latest development from GL Sciences, and Inertsil Series are popular lines for many years in HPLC industry. Various separation mechanisms are available to fit for a wide range of applications. The GL Sciences UPLC and HPLC columns are known by its good performance and very low backpressure.