The Class 1 mixtures below reflect the requirements of USP23/NF18 effective January 1, 1995 to December 31, 1999. While these mixtures do not meet the current USP guidelines, many still use these mixtures to obtain a detectable benzene peak for the direct injection methods, Method I and Method V.
| Restek | |
|---|---|
| Product Category | Chemical Additives and Agents |
| Product Name | USP <467> Calibration Mixture #4 |
| Function | Reference / Chemical Standard |
