ASTM D6862 Resistance-to-Peel Strength of an Adhesive

Introduction

The resistance-to-peel strength of an adhesive is determined using the ASTM D6862 test technique. The test is performed between one rigid adherend and one flexible adherend. The ASTM D6862 test is expressly developed to assess the elasticity of adhesives.

Scope of ASTM D6862:

ASTM D6862 test method is used to determine the resistance-to-peel strength of an adhesive. Even glues with substantial adhesive qualities may operate poorly if the adhesive’s cohesive strength is minimal. The test method is helpful for acceptance and quality control testing in laboratories and industries. Further, the 90-degree peel test is also one of the most common since this test generally results in the lowest peeling force. Also, the elasticity can be an independent determiner of peel strength.

Procedure of ASTM D6862:

Sample Preparation

Adhesive and Substrate: An adhesive sample is made by spreading it on a given material surface. The substrate could be metal, plastic, or fabric, depending on the adhesive’s nature.

Bond Formation: The adhesive and substrate are also bonded under specific conditions, such as the amount of pressure, how it is applied, and whether the adhesive needs to be cured.

Cutting the Sample: The bonded specimen is then cut into test strips, typically of 1 inch width. The specimens are then conditioned in a temperature and humidity chamber at a controlled condition of (25 ± 1.5) o C and (50 ± 5) % relative humidity for not less than 2 hours.

Test Setup

Testing Machine: A UTM that comes with a load cell and grips is usually used in testing.

Angle of Peel: The test is performed by peeling the adhesive at 180 degrees. This angle also ensures that the peeling force is applied directly to the opposite side of the adhesive bond, resulting in uniform stress.

Peel Rate: The machine peels the adhesive at a predetermined speed, standardized at 300 mm/min (12 inches/min).

Conducting the Test

Mounting the Specimen: In this test, one end of the specimen is placed in the moving grip of a testing machine while the substrate is placed in the other fixed grip.

Peeling: The testing machine, known as the ASTM D6862 fixture, grips the adhesive strip at one end. Further, it eases it upwards at the test speed while pulling the strip off the substrate with a particular force.

Data Collection: To achieve those above, the machine records the force experienced when peeling the adhesive shown in the force-displacement curve

Specimen Size of ASTM D6862:

Result 

The ASTM D6862 test yields the adhesive’s peel strength, which is defined as the average force necessary to remove the adhesive from the substrate at a 180-degree angle. This value is often expressed in units of force per unit width, such as Newtons per meter (N/m), pounds per inch (lb/in), and kN/m.

Conclusion:

In conclusion, ASTM D6862 is a vital test technique for determining adhesive peel resistance. Furthermore, it offers critical data for material selection, product development, quality control, and failure analysis in sectors requiring adhesive solid bindings.

FAQs on ASTM D6862