ASTM D7105-06 Determining the Adhesive and Cohesive Strength

ASTM D7105-06 is the standardized test method for determining the adhesive and cohesive strengths between materials in roofing or waterproofing membranes or systems. The method is useful in identifying the weakest plane in the system. The values are reported in SI units or inch-pound units.

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    The standard test method ASTM D7105-06 covers the procedure to measure the force required to separate the components of a roofing or waterproofing membrane system. The measured force acts normal to the plane of the membrane. The separation can be adhesive or cohesive depending upon the magnitude of adhesive and cohesive strengths of the materials.

    Test Procedure:

    The specimens are subjected to a force normal to the plane of the membrane using a testing machine. The cohesive strength of an adhesive layer is measured when the separation happens within the adhesive layer. When the separation takes place at the adhered surface, the adhesive strength is recorded. The cohesive strength of the weakest material is evaluated when the separation takes place within the material. A universal testing machine is used to measure the adhesive and cohesive strengths of the material under test.

    Specimen size:

    50 mm (2 inches) to 150 mm (6 inches)


    Report the adhesive used, plane of separation and type of separation.
    Report the maximum stress in kPa (lbf/in2).
    Report the mean, maximum load, estimated standard deviation.


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