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Method 4.7.15 is a salt fog test for carbon-based conductive fibers. Three samples of size 26 uninsulated conductor, each approximately 3 feet (0.91 m) in length, are placed on PTFE or PTFE-coated mandrels that are 6 times the diameter of the wire with the ends secured.
Lead wires are attached to each end of the test sample and DC resistance is measured through the lead wires. The three samples are then hung in a chamber and exposed to the salt fog environment.
After exposure, DC resistance is measured again and compared to pre-test values. This test evaluates the corrosion resistance of carbon-based conductive fiber conductors in marine salt-laden atmospheres.