SYMPOSIA PAPER Published: 01 January 1992

New Tests for Adhesion of Silicone Sealants


It has been widely accepted that the ASTM C-794 peel test is suitable for determining adhesion between the sealants and substrates used in curtain wall construction. However, it is shown in this paper that this test has certain deficiencies which may allow the acceptance of some materials which in fact have poor initial adhesion and long-term durability.

The influence of the specimen's geometry, sealant type, sealant thickness, cross-head speed (test rate), etc, on the resultant failure mode and quantitative results are discussed in detail.

Finally, two novel adhesion tests are proposed and discussed, i.e.: (a) ‘thin’ peel specimen test (b) ‘thin’ lap-shear specimen test.

Comparative results, obtained using a range of common commercially available sealants, show that the proposed tests have significant advantages over the accepted ASTM C-794 test as well as the DIN 52455 and ISO/DIS 9047 tests.

Author Information

Gutowski, VS
, Highett, Victoria, Australia
Russell, L
, Highett, Victoria, Australia
Cerra, A
, Highett, Victoria, Australia
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Developed by Committee: C24
Pages: 87–104
DOI: 10.1520/STP14875S
ISBN-EB: 978-0-8031-5220-5
ISBN-13: 978-0-8031-1857-7