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Surface Preparation
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Solvent Cleaning
The number of resin systems, fibers, and fillers used in composites is ever increasing. No single cleaning solvent is ideal for them all. However, isopropyl alcohol ( M-LINE GC-6 ) is satisfactory for many resin systems. If in doubt about compatibility with a solvent, consult the resin system manufacturer. And don't forget to verify compatibility with any exposed fibers and fillers. Composites fabricated with silicone releasing agents, or structures coming into contact with silicone greases or oils prior to gaging, require special cleaning. Strain gages cannot be successfully bonded to surfaces contaminated with these materials. Light concentrations can often be removed by several washing/drying cycles performed with M-Prep Conditioner A warmed to approximately +95 deg F (+35 deg C). Procedures recommended by the silicone manufacturer must be used on heavier contaminations, or when water-based cleaners are disallowed. 
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