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Elastomeric joint sealant peeling test ASTM C794

ASTM C794 peeling test

The ASTM C794 peeling test is a standardized procedure used to determine the peel properties of cured-in-place elastomeric joint sealants. This test is crucial for assessing the sealant's ability to maintain a bond to the substrate under severe peel conditions. It is particularly useful for quality measurements and comparing batches of the same sealant relative to adhesion. The test is not intended for comparing the overall performance of different sealants in a given application, as the adhesive force also depends on the modulus of elasticity and the degree of strain the sealant will experience. 

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Figure from ASTM C794 : Standard Test Method for Adhesion-in-Peel of Elastomeric Joint Sealants


ASTM C794 Test Method

Adhesion-in-Peel Test: The cured sealant is pulled away from the substrate at a 180° angle at a rate of 2 inches per minute.

Failure Mode Observation: The test records whether the failure is adhesive, cohesive,or mixed and quantifies any residual sealant on the substrate.

Force Measurement: Peel force is measured continuously using a universal testing machine and recorded in pounds-force per inch (lbf/in).


ASTM C794 Equipment and sample Preparation

Specimen Dimensions: Each sample consists of a 25mm (1 inch) wide and 150mm (6 inch) long bond area with a uniform 0.25-inch thickness of sealant.

Substrate and Backing Panel: Aluminum, mortar, or glass panels are cleaned with isopropyl alcohol; sealant is applied with a caulking gun.

Curing and conditioning: Specimens are cured at 23 + 2°C and 50 + 5% RH for 21 days before testing, then aged in water or air for specified durations.


Beijing United Test Co.,Ltd. export@unitedtest.com offer the tensile peel testing equipment and ASTM C794 peeling test fixture of Elastomeric joint sealant peeling test ASTM C794 Applications. Contact us now : export@unitedtest.com, unitedtest@hotmail.com 

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