ASTM F22 Water-break Test for Hydrophobic Surface Films

ASTM F22 is a standard test method for determining if there are any hydrophobic contaminants present on the surface of a specimen. This test procedure is commonly used to determine if surface contaminants on metal surfaces are absent, as they interfere with subsequent surface treatments like a surface coating.

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ASTM F22 Water-break Test for Hydrophobic Surface Films

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Water Resistance Testing of Coatings in 100% Relative Humidity (ASTM D 2247): Water resistance testing of painted or coated panels is accomplished by placing them in an enclosed chamber containing a heated, saturated mixture of air and water vapor. The chamber's temperature is usually maintained at 100° F (38° C).

The specimens are dried in an oven for a specified time and temperature for the water absorption test and then placed in a desiccator to cool. Immediately upon cooling, the specimens are weighed. The material then emerges in water at agreed-upon conditions, often 23°C, for 24 hours or until equilibrium.

ASTM F22 Water break tests are used primarily for metal surfaces to identify surface contaminants on incoming raw materials or after surface processes, such as cleaning processes, etching, anodizing, painting, priming, coating, grit-blasting, or sanding, have occurred.

The water break check simply involves flooding a clean surface similar to those inspected and observing the surface film. A sufficient wetting agent is present if a continuous film forms over the entire surface.

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