Ensure your coating will provide winter protection
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09-28-2015, 08:25 AM
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Ensure your coating will provide winter protection
In order to successfully form a continuous coating, the liquid should be able to wet the surface of the material. Wettability depends on one specific property of the surface: surface energy. The surface energy of the solid substrate directly affects how well a liquid wets the surface.
To achieve good wettability, the surface energy of the substrate needs to exceed that of the surface tension of the liquid by around 2 - 10 mN/m (Dynes). The Dyne level reflects the surface wettability - the higher the Dyne level, the better the wettability/adhesion.
To obtain optimum adhesion, it is necessary to increase the surface energy of the substrate to just above that of the material to be applied. For optimum adhesion of a coating on various substrates, it is necessary to obtain a high surface energy. Determining the surface energy can be achieved by measuring contact angle or by use of Surface Energy Test Liquids or Pens (Dyne level testing).
This form of measurement is based on the ISO method for measuring the surface energy of polyethylene film. Surface energy may be defined as the excess energy at the surface of a material compared to the bulk.
Every solid surface has a specific and measurable surface energy. The unit of measurement used is the Dyne/cm² or mN/m.
When the Dyne level test liquid is applied to the surface, the liquid will either form a continuous film on the surface or pull back into small droplets. If the Dyne test fluid remains as a film for 3 seconds, the substrate will have a minimum surface energy of that fluid value, expressed in N/m (Dynes). Should the Dyne test fluid reticulate or draw back into droplets in less than 1 second then the surface energy of the substrate is lower than that of the fluid itself. To test the viability of a coating requires measuring the surface energy (surface tension).
Using a Dyne Test Pen will measure the surface tension and identify whither the coating is still viable, which requires a surface tension of 38mN/m or higher.
Measure the surface energy by using slight pressure to draw the Dyne Quick Test Pen tip across the coated surface. If the ink lines shrink or bead within 1-2 seconds then the surface protection is degrading as the surface energy level has dropped to less than 38 Dynes. If the ink lines remain as marked and do not shrink then the test sample surface protection is still viable as the coating has a surface energy of 38 Dynes or higher.
Dyne Quick Test Pen - http://www.dynetechnology.co.uk/meas...ick-test-pens/
See also "The Science behind Coatings" – http://togwt1980.blogspot.co.uk/2015...-coatings.html
To achieve good wettability, the surface energy of the substrate needs to exceed that of the surface tension of the liquid by around 2 - 10 mN/m (Dynes). The Dyne level reflects the surface wettability - the higher the Dyne level, the better the wettability/adhesion.
To obtain optimum adhesion, it is necessary to increase the surface energy of the substrate to just above that of the material to be applied. For optimum adhesion of a coating on various substrates, it is necessary to obtain a high surface energy. Determining the surface energy can be achieved by measuring contact angle or by use of Surface Energy Test Liquids or Pens (Dyne level testing).
This form of measurement is based on the ISO method for measuring the surface energy of polyethylene film. Surface energy may be defined as the excess energy at the surface of a material compared to the bulk.
Every solid surface has a specific and measurable surface energy. The unit of measurement used is the Dyne/cm² or mN/m.
When the Dyne level test liquid is applied to the surface, the liquid will either form a continuous film on the surface or pull back into small droplets. If the Dyne test fluid remains as a film for 3 seconds, the substrate will have a minimum surface energy of that fluid value, expressed in N/m (Dynes). Should the Dyne test fluid reticulate or draw back into droplets in less than 1 second then the surface energy of the substrate is lower than that of the fluid itself. To test the viability of a coating requires measuring the surface energy (surface tension).
Using a Dyne Test Pen will measure the surface tension and identify whither the coating is still viable, which requires a surface tension of 38mN/m or higher.
Measure the surface energy by using slight pressure to draw the Dyne Quick Test Pen tip across the coated surface. If the ink lines shrink or bead within 1-2 seconds then the surface protection is degrading as the surface energy level has dropped to less than 38 Dynes. If the ink lines remain as marked and do not shrink then the test sample surface protection is still viable as the coating has a surface energy of 38 Dynes or higher.
Dyne Quick Test Pen - http://www.dynetechnology.co.uk/meas...ick-test-pens/
See also "The Science behind Coatings" – http://togwt1980.blogspot.co.uk/2015...-coatings.html
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