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January 2017 • SMT Magazine 105 rosin or no-clean with some rosin. ORM0 could be an alcohol-based no-clean, a water-based no- clean (VOC-free), a standard water soluble, or a water-based water soluble. But the information on the datasheets with the designator, the solids content and the de- scription of the flux should provide you with good idea about what kind of flux you have. However, you may have to either consult with the manufacturer or the MSDS to determine the solvent, usually alcohol or water. If a flux con- tains rosin, you can be quite certain that it is an alcohol based flux, as rosin is not naturally sol- uble in water. CHOOSING THE CORRECT FLUX —ADVANTAGES/DISADVANTAGES Figure 1: Liquid flux and classification. Table 1: Flux designation.