VWR® TraceClean®. VWRU89094-204EA 516 SGD. VWRU89094-202 VWRU89094-204. EPA vials, TraceClean® TOC free. Vials Water Sampling Vials. These vials made from borosilicate glass, clear, type I are processed according to strict cleaning protocol, are lot traceable and include a Certificate of Analysis and specification form in each case. TOC free.