ASTM D7490 Contact Angle Measurements

ASTM D7490 Contact Angle Measurements

ASTM D7490 provides a method for measuring contact points of two fluids, one polar and the other nonpolar, of known surface strain on a substrate, color, or relieved or air-dried covering. The qualities are expressed in CGS units (Dyn/cm).

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    Scope:

    ASTM D7490 is important to provide data for the calculation of two components – dispersion, γsd, and polar, γsp – by using contact angles of two liquids. Although this procedure is exceptionally valuable in describing surfaces, assessing surface dynamic added substances, and clarifying issues, it is not intended to be a quality control or determination test.

    Procedure:

    In ASTM D7490 the contact points of drops of refined water and di-iodomethane (methylene iodide) are estimated on a superficial level of interest. The two qualities are then subbed into two separate articulations of the Owens-Wendt-Kaelble condition (one for every fluid). Then water contact angles are measured rapidly (within 30 s of depositing the drop). A humidity chamber is also used to reduce the rate of evaporation.

    Video 01: Contact angle measurement

    Specimen size:

    In ASTM D7490 testing, a syringe outfitted with a No. 27 hardened steel needle, equipped for giving 100 to 200 drops from 1 mL of the liquid, is reasonable for use with water-like fluids.

    Data:

    The following data is calculated for ASTM D7490:

    γ1 (1+ cos θ)/2 = [(γldγsd) ½ + (γlpγsp) ½

    Where θ is the average contact angle for the test liquid on the test specimen, γ1 is the surface tension of the test liquid in Dyn/cm, and γd and γp are the dispersion and polar components of the liquid and the solid, also in Dyn/cm.

    Conclusion:

    ASTM D7490 is important to provide data for the calculation of two components – dispersion, γsd, and polar, γsp – by using contact angles of two liquids.

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