90° peel test

ASTM D6862 is a standard issued by ASTM - American Society for Testing and Materials. 

"The purpose of this test method is to provide for the determination of the resistance-to-peel strength of adhesives when surfaces joined by an adhesive are separated by applying a force to one of the surfaces at a 90 degree angle"

Application

The test is done by first applying the flexible aherend to a rigid adherend, typically a testing panel such as a steel plate, then pulled at a constant crosshead speed of 254mm/min (10in./min).

90 Degree peel test fixture

Accessories

The accessories requied for the 90 degree peel test are the peel test stage and steel plates. The adherends are to be adhered together uniformly as possible. Often times a roll down machine is used for percise sample preparation as some adhesives can be pressure sensitive.

Once the steel plates are prepared with the samples the plates must be loaded on the peel test stage. The remaining tape is held by a tensile grip and pulled apart at a constant rate.

ASTM D6862: Fig. 1 Sample Test Apparatus

Software

ASTM D6862: 9. Calculation - "...at least 76 mm (3 in.) of peeling (disregarding the first 25 mm (1 in.)), the average resistance-to-peel strength in kilonewtons per meter (pounds-force per inch) of the specimen width required to separate the adherends. The average may be calculated as the average of load readings taken at fixed increments of crosshead motion."

Salt's UTM software allows the user to set parameters such as averaging range (start and end). The software also allows the display of 4 point peak values, aberages and min/max values of set range for a much more detailed report.

User input for 4 points for resistance-to-peel strength and start/end positions for averaging.

The details of the procedure as well as other information can be found in ASTM D6862.