Contact Angle Measurement

The ability of materials to adhere to a surface can be determined in a lab by measuring the angle of contact of a liquid on a solid (substrate). Contact angle is considered the industry standard for determining the hydrophobicity or oleophobicity of a surface.

The more a droplet spreads (is attracted to) the substrate, the lower the contact angle. In general, contact angles >90 degrees indicate a material is hydrophobic and >50 degrees oleophobic. In lab tests, an untreated surface (left) has a contact angle of 60.8 degrees, while the surface treated with e9 Pro Metal Treatment (right) has a contact angle of 114.3 degrees, indicating it is both hydrophobic and oleophobic.

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