Why not ask your chemical vendor what QC tests they perform on their product to insure that it is correctly made, and then do them yourself. Typical tests for the type product that you list are specific gravity (AKA Baume') and acidity. Would be happy to assist you in setting up testing internal testing program to insure quality. If interested, contact me directly. Rudy Sedlak RD Chemical Company phone: 415-962-8004 fax 415-962-0370 [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************