Tag Archives: contamination

  • Handheld Solution for Verifying Surface Cleanliness

     

    low contact angle

    Figure 1. Water drop demonstrating a low contact angle and a clean surface.

    high contact angle

    Figure 2. Water drop demonstrating a high contact angle and a contaminated surface.

    The Surface Analyst™ is an innovative handheld solution for use in the lab and on the factory floor. It reduces waste, rework, and recalls when poorly prepared substrate surfaces lead to bonding, coating, sealing, painting, or printing failure.

    Using contact angle measurement, the Surface Analyst measures the cleanliness level of surfaces and determines preparedness for adhesion. Developed and manufactured by BTG Labs, it is a fast, easy, accurate, and nondestructive instrument for manufacturers with critical surface requirements. The Surface Analyst replaces legacy methods such as dyne and water break tests.

     

    Measuring Contact Angle to Determine Surface Cleanliness

     

    The Surface Analyst deposits a highly purified drop of water on the surface. In two seconds, it measures the contact angle and in turn, determines the cleanliness level of a substrate.

    When a surface is clean, it emits high energy, and water–as a high energy molecule–spreads out on the surface, in attraction to other high energy molecules (Figure 1). A contaminated surface emits low energy and will cause water to bead up in attraction to itself rather than the low energy surface molecules (Figure 2).

    By knowing the volume and area of a drop of water, the contact angle of the water against a given surface can be determined. The larger the contact angle, the more the water beads up on the surface – and therefore the lower the energy level of the surface.

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