SYMPOSIA PAPER Published: 01 January 1992

The Influence of Gloss Level in Polyester-Powder Coatings on the Adhesion of Silicone Sealants


It has been frequently observed that the strength of adhesion between silicone sealants and polymer-coated substrates depends on the coating's gloss level.

The study described in this paper reveals that there seems to be a relationship between the gloss and the coating's surface properties as determined by the non-dispersive, γn-d, component of the total surface energy. It is shown that gloss increase is associated with an increase in the substrate γn-d. The exact pattern of this relationship cannot yet be established due to the narrow range of experimental data. Experiments carried out with several commercially available silicone sealants show that the higher the coating's gloss level, the stronger the adhesive bond between the sealant and the substrate. This finding is shown to be consistent with the earlier proposed mechanism of adhesion, according to which an increase in the value of the non-dispersive component of the substrate total surface energy leads to increased bond strength to the point where adhesive forces become stronger than the cohesive strength of the bulk sealant.

Author Information

Gutowski, VWS
Construction and Engineering, Highett, Australia
Cerra, A
Construction and Engineering, Highett, Australia
Russell, L
Construction and Engineering, Highett, Australia
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Developed by Committee: C24
Pages: 117–125
DOI: 10.1520/STP14877S
ISBN-EB: 978-0-8031-5220-5
ISBN-13: 978-0-8031-1857-7