Click to Purchase and Download this Standard or Test Method
Revision Date: August 22, 2013
Updated On: September 17, 2013
5.1 The method described in this standard is based on the concept that the total free energy at a surface is the sum of contributions from different intermolecular forces, such as dispersion, polar and hydrogen bonding. There are other techniques that employ three components (dispersion, polar and hydrogen bonding). These methods are further complicated by needing three to five test liquids and are not practical for routine testing. This method uses contact angles of two liquids to provide data for the calculation of two components, dispersion, ?sd, and polar, ?sp.
5.2 Dispersion and polar component data, along with the total solid surface tension, are useful for explaining or predicting wetting or adhesion, or both, of coatings on pretreatments, substrates and other coatings. Low solid surface tension values often are a sign of contamination and portend potential wetting problems. High polar components may signal polar contamination. There is evidence in the literature that matching of polar components of topcoats and primers gives better adhesion.4
5.3 Solid surface tensions of pigments, particularly the polar components, may be useful in understanding dispersion problems or to provide signals for the composition of dispersants and mill bases. However, comparison of pigments may be difficult if there are differences in the roughness or porosity, or both, of the disks prepared from them.
5.4 Although this technique is very useful in characterizing surfaces, evaluating surface active additives and explaining problems, it is not designed to be a quality control or specification test.
From Detection to Correction
Corrosion Probe, Inc. has the Most Concrete Coatings Experience and Expertise. Contact us today at
The MBX Bristle Blaster
Get a 2.7 to 3.3 mil profile and a
Near White Metal Clean.
For info visit www.mbxit.com
or call 877 629-8777
Handheld VertaJet™ for concrete or steel
Ergonomic VertaJet from NLB boosts surface prep productivity. See how rotating 40,000 psi water jets strip a 6” path and get into corners, with vacuum recovery.
PRESSURE PRO PRESSURE WASHERS All types – All sizes to meet
your every need.
Available to buy or rent.
• Cold Water • Pro Max
• Poly Belt • Gas
24 HP Honda Generator CESCO Best Value $4065.00
Contact us: 888-772-3726