SYMPOSIA PAPER Published: 01 August 2018
STP160420170134

Implementing ASTM C1735 into Conventional Methods for Assessing Durability of Sealants

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The recent introduction of ASTM C1735, Standard Test Method for Determining Tensile Adhesion Properties of Structural Sealants, allows a durability assessment of a sealant joint assembly without incurring destruction. Conventional testing of sealant assemblies to ASTM C1135, Standard Test Method for Determining Tensile Adhesion Properties of Structural Sealants, or ISO 8339, Building Construction—Sealants—Determination of Tensile Properties (Extension to Break), for assessing durability is to fabricate sealant joint assemblies and then to subject them to destructive testing after various exposures and durations. The stress-strain curves are then compared to each other over time to draw conclusions on durability. This results in the fabrication of many assemblies when data points are the average of three or five assemblies. The C1735 method allows one to reuse the specimens to track changes in modulus with various exposures because it does not take the specimens to failure. The C1735 method evaluates the specimens at a user-chosen strain, typically well below the ultimate destructive strain of the assembly. One can then draw conclusions on the specimen durability performance based on tracking the data and determining modulus changes with time. This paper reports the data of sealant test assemblies built and tested to C1735 and subjected to static exposures of room temperature; ultraviolet florescent exposures according to ASTM C1442, Standard Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus; room temperature water immersion; 55°C water immersion; and 88°C heat aging. The durability was assessed by visual inspection and change in modulus with exposure. The results show that C1735 is a viable method for assessing durability and reducing the number of specimens fabricated for a specific study. A comparison is made between destructive testing and C1735 testing noting the advantages and disadvantages of each method.

Author Information

Carbary, Lawrence
Dow Corning Corporation, Midland, MI, US
Allore, Kelly
Dow Corning Corporation, Midland, MI, US
White, Christopher
National Institute of Standards and Technology, Gaithersburg, MD, US
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Details
Developed by Committee: C24
Pages: 63–73
DOI: 10.1520/STP160420170134
ISBN-EB: 978-0-8031-7654-6
ISBN-13: 978-0-8031-7653-9