Resistivity of solvent extracts test

The test most widely used in the printed-circuit industry to measure the efficiency of a cleaning process is the resistivity of solvent extracts test known as ROSE. According to this test, after the assembly has been cleaned, the part is flushed with a solution of 75% isopropanol and 25% deionized water and the electrical resistivity of the extracts measured. Ionic residues dissolved in the extracts reduce the resistivity of the original... 

Detection and measurement of ionizable surface contaminants by resistivity of solvent extract (ROSE), Method 2.3.25. IPC-TM-650 Test Methods Manual. Feb. 2001. 

For processes utilizing potentially corrosive rosin based fluxes, simple test options to determine cleanliness such as resistance of solvent extract (ROSE) tests can be used. Other more significant tests may be required to determine the residue properties of organic residue fluxes, such as those commonly used during hot air solder leveling (HASL) of boards.The most common of these are ion chromatography tests that can characterize the residuals and their potential hazards to the product. 

Polyethylene has also been modified by extrusion at 200°C in the presence of isoprene-styrene rubbers or butadiene-styrene rubbers. The formation of graft copolymers has been shown by solvent extraction tests and IR spectroscopy. Grafts of the first composition are more easily induced by the tertiary proton reactions in the isoprene units. The crack resistance of polyethylene reportedly increases exponentially with the amount of graft content [234]. 

Chemical resistance (reagent resistance] n. The ability of a plastic to maintain structural and esthetic integrity when exposed to acids, alkalis, solvents, and other chemicals. ASTM tests for chemical resistance of plastics include C 581, chemical resistance of thermosetting resins used in glass-fiber-reinforced structures D 543, resistance of plastics to chemical reagents D 1239, resistance of plastic films to extraction by chemicals D 1712, resistance of plastics to sulfide staining D 21451, test... 

A microchannel contactor has been developed and tested with water and cyclohexane streams extracting cyclohexanol [199]. Using this device, the relative importance of mass transfer resistance in the flow channels versus the contactor plate was explored. Both micromachined contactor plates and commercial polymeric membranes were configured with various channel heights both on the feed and solvent sides. Data indicate that contactor plate mass transfer becomes... 

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