Production Machining

MAY 2018

Production Machining - Your access to the precision machining industrial buyer.

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50 PRODUCTION MACHINING :: MAY 2018 PARTS CLEANING restrictive drying processes. Materials compatibility is similarly a major area for concern, and solvent has proven to provide superior results in some cases. Unlike aqueous cleaners that must be matched to specific process substrates, solvents generally offer: • Multi-metals compatibility • Multiple elastomers compatibility • Multiple lubes-removal compatibility • Ease of application • Assured drying • Very low surface tension • Lower energy consumption and therefore lower cost of operation • Less floor-space requirement New Solvents vs. Old Solvents ere are several solvents commonly used in the parts cleaning industry. eir requirements range from low to high operational temperatures, and their chemical compositions can include chlorinated, brominated, fluorinated, alcohol and others. e main difference among them are their environmental and health characteristics. Most solvents will clean, however, numerous solvents are being phased out or For more information about cleaning chemistry, visit PM's Parts Cleaning Zone. LINK :: are becoming more regulated because of personnel exposure limits and air emissions. Users today are evaluating these new options in order to provide a safer workplace. Based on regulatory concerns, many chemical manufacturers have devoted resources to research and development efforts. Recently, a new generation of solvents has emerged. ese emerging new solvents include hydrofluoro-olefins (HFOs), hydrofluoroethers (HFEs) and trans blends. Some contain no chlorine, bromine or fluorine, such as modified alcohols and refined hydrocarbons. ey are used in vacuum degreasers, which can drastically reduce solvent consumption as well as offer the operator maximum isolation from the process. e highest-rated new solvents offer the following features: • High PEL limits for personnel safety • Low GWPs • Low surface tension • Very low VOC or VOC-free ratings • Non-flammable • Low carbon footprint contribution • Lower-temperature operation • Compatibility with multi-metals/lubes • Rapid drying (and generally residue-free) • Stability Choosing Aqueous or Solvent Cleaning Whether to use an aqueous or a solvent process is the metal parts manufacturer's choice, but the right chemistry will help improve parts cleaning. e many characteristics and different aspects of the two types of processes have to be evaluated. Compatibility and efficiency testing should be performed before a new process is selected. Such tests could prove that a process is superior to another and/or indicate that a process isn't the most appropriate for the specific manufacturing needs. ere is an abundance of information available and easily accessible to help manufacturers determine which cleaning method bests suits their needs, from government resources to environmental organizations to equipment and chemical suppliers to technical papers and consultants. Use these resources to supplement your decision-making. :: Solvent cleaners often are used with immersion systems, as shown here. CONTRIBUTOR Joe McChesney is the global product line manager, solvents, at Kyzen Corp. He can be reached at 615-831-0888, or for more information from Kyzen, v isit k

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