Adhesive bond strength tests tape test

Test Method for Impact Strength of Adhesive Bonds Test Method for Tensile Properties of Adhesive Bonds Test Methods for Pressure Sensitive Adhesive Coated Tapes Used for Electrical and Electronic Applications... 

Standard tests used to characterize the adhesion properties of tapes are for the assessment of shear strength (see Shear tests) (the ability of a tape joint to resist a load applied in the shear mode), peel strength (see Peel tests) (the resistance of a tape joint to peeling under specified conditions) and Tack (the ability of a pressure-sensitive adhesive to form a bond immediately on contact with another material). There are many standard test specifications laid down by different authorities to assess these properties and many differences in detail between them (e.g. see Appendix). No attempt will be made to describe them comprehensively, but the principles of the tests will be discussed separately. 

D-0903. Test Method for Peel or Stripping Strength of Adhesive Bonds. This is the standard 180 peel test (Fig. 12) applicable where one of the adherends is sufficiently flexible to endure the 180° fold back. Tests the resistance to peel separation of flexible foils, films, or tapes from relatively rigid base adherends (metal, wood, plastic, glass, etc. of adequate thickness). 

The strength of adhesion can be measured using an automated materials testing system, such as the one described in Chapter 16. By pulling the bond apart (e.g., by applying axial tension), the work of adhesion can be measured. Peel tests are also commonly done, and these largely resemble pulling a piece of tape (or a Band-Aid ) off a surface. 

Shear strength of a tape joint is often assessed in the industry by a shear adhesion or holding-power test, in which a weight (e.g. 0.5 kg) is hung on a tape bonded over a known area (e.g. 1 in. ) to a steel test plate (Fig. 1). The time taken (at a given temperature) for... 

Four different adhesives were tested, details of which can be found in O Table 30.1. The adhesives were AVI 19, a one-part epoxy manufactured by Hexcell 9245, a structural bonding tape (SBT) manufactured by 3M 3532, a two-part polyurethane also manufactured by 3M and Hysol XEA 9359.3, which is a two-component structural adhesive that exhibits high peel and high tensile lap shear strength. 

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