Peel Resistance Testing

Due to the occurring fluctuations, only the range of 30-90% of the peeled test piece length will be utilized in the analysis for the determination of the average peel force. Then, with reference to the test piece width b, the peel strength p, results 

What is the peel strength of a bonded test piece with the test piece width b = 30 mm at a measured average peel force F =22.5 N  

Peel strength ps = average peel force = = 2 5 = 0J5 JL = 7.5 JL test piece width b 30 mm cm 

This test method is preferably used for the comparative evaluation of adhesives and surface pretreatment methods, since it enables the indication of the differences in the adhesive and cohesive behavior of the adhesive layers with high sensitivity. Pressure-sensitive adhesives (adhesive tapes, adhesive labels) are also tested according to this principle. 

In most cases, adhesion fractures are a sign of insufficient surface pretreatment. In the case of mixed fractures, the reason is to be seen, with high probability, in an incomplete or uneven degreasing. The neglected degreasing after blasting can also be seen as a cause, if the compressed air has not been absolutely fat-free. A cohesion fracture may be the consequence of an adhesive layer not completely cured or of the application of an inadequate adhesive mix. 

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NF 776-126 1987 Adhesives for flexible floor coverings. Peel resistance test at an angle of 90 degrees. (Floating Roller method). 

D 1876 Test Method for Peel Resistance of Adhesives (T-Peel Test)... 

D 3167 Test Method for Floating Roller Peel Resistance of Adhesives... 

The testing of the peel resistance occurs according to the standard DIN EN 1464 Adhesives - determination of peel resistance of high-strength bonded joints - climbing drum peel test (respectively, T-peel test) and serves the determination of the resistance of bonded metal joints to peeling forces (Figure 10.5). 

When loading this test piece with force F it is noticed that, unlike in the tensile shear test, the force is not applied to an area A (= b x fu), but to a line X... X. The other area of the adhesive layer remains unstressed. Thus, in this case strength cannot be defined as force per area , but the force referring to a line is called peel resistance. If the test piece shown in Figure 10.5 is tom apart by means of force F, and the force over the peeled distance is recorded, the following peel diagram results (Figure 10.6). 

FIGURE 3.77 Test panel and T-type test (T-peel test) specimen for peel resistance of adhesives (standard test method ASTM D1876-95). The bent, unbonded ends of test specimen are clamped in test grips of tensile testing machine and load applied at a constant head speed of 254 mm (10 in.). Average peeling load (in pounds per inch of specimen width) is determined for the first 127 mm (5 in.) of peeling after the initial peak. 

ASTM D1876-72(83). Peel Resistance of Adhesives (T-Peel Test), Annual Book of Standards, 15.06, American Society for Testing and Materials, 1986,... 

Clarke (7), as early as 1971, studied the behavior of a nitrile rubber modified, epoxy paste adhesive using the climbing drum peel strength test. Peeling resistance was... 

ASTM D3167-03a Standard test method for floating roller peel resistance. 

ASTM D 1781-76—Climbing drum peel test for adhesives ASTM D 1876-72—Peel resistance of adhesives (T-peel test)... 

Evaluating Peel Strength of Shoe Sole Attaching Adhesives, Test for (D 2558) Determining Durahiliiy of Adhesive Joints Stressed in Peel, Practice for (D 2918) Floating Roller Peel Resistance, Tbst for (D 3167)... 

Peel test. Because adhesives are notoriously weak in peel, tests to measure peel resistance are very important. Peel tests involve stripping away a flexible adherend... 

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