Contact angle measurement can be used to understand how a liquid interacts with a material surface. The angle formed by a liquid droplet on the surface provides an indication of its wetting and adhesion behaviour.

Smithers can measure static contact angle as well as changes in droplet volume and spread over time.

A diagram of our water drop contact angle tests.

Dynamic absorption testing

Dynamic absorption testing (DAT) measures how a liquid droplet changes as it interacts with and is absorbed by the material surface. This can be used to assess properties such as the degree of sizing, liquid absorbency and water hold-out of paper and board over time.

For more detailed surface analysis, contact angle measurements can also be related to surface tension and work of adhesion using the Young-Dupré relationship.

Standards

Testing is available in accordance with the requirements of ASTM D5725 and TAPPI T 558.

Talk to our experts about your paper or board material and the wetting, absorbency or surface properties you need to evaluate.

Download a brochure for more information:

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