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  Technical Data | FAQ

General HPLC Column Questions
 Question: What is the difference between ODS-2 ODS-3 and ODS-4?
 Answer:  ODS-4 and ODS-3 are newer and more advanced than the ODS-2 and related 2-Series family (including C8, Ph, C4, and Silica 150A) The 3-Series product line was an improvement on the 2-series product line, in that the silica purity was increased, the chemical and physical stability of the silica was enhanced, and the bonding and end capping were optimized to create a more deactivated phase. ODS-4 and ODS-3 are based on a different silica than ODS-2. Additionally, ODS-4 and ODS-3 provides much lower operating pressure than ODS-2. We will always supply ODS-2 and the rest of the 2-Series (C8, Ph, C4, Sil 150A) for established methods. But for new methods, we recommend trying the 3- or 4-Series products.


General Business
 Question: What is the difference between Inertsil I have gotten from other vendors and Inertsil I receive directly from GL Sciences, Inc?
 Answer: GL Sciences, Inc. invented Inertsil and has made the silica packing material, in it's Japan manufacturing factory, for EVERY Inertsil column ever sold.  In the past, some vendors obtained bulk materials and packed their own columns.  To avoid inconsistencies in product performance, testing, labeling, etc., GL Sciences, Inc. discontinued selling bulk packing in 2005.  Now, all Inertsil columns you use, regardless of the source, should have been produced by GL Sciences in Japan.
 
 Question: Does GL Sciences sell directly to customers?
 Answer: Yes, we sell directly to end-users as well as company-specific purchasing organizations such as VWR and Fisher.