AIT'S flexible die attach, component attach and substrate attach adhesives have a dramatic advantage over the more traditional epoxy attached devices. They can be reworked readily with the application of stress concentration with twisting or torque.
Rework Procedures for Stress-Free Epoxy and Thermoplastic Adhesives
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Rework of Epoxy and Thermoplastic Adhesive Joints are Primarily Mechanical in Nature
Both epoxy and thermoplastic adhesive bonding can be strong and tough to break. Because of the flexibility built into the polymer network, AIT adhesives tend to be easier to rework at elevated temperature. In some cases, the epoxy network may be swollen with suitable solvent for easier removal. Most of the thermoplastic adhesives may be dissolved or softened with suitable solvent for easier removal and cleaning.
Bond and adhesive materials are easier to break when stresses are concentrated to exceed its tensile or shear strength (Figure 1). Thus torque and peel stresses initiated at corners or some localized points will require much less force and thus easier to perform.
Method 1:
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Method 2:
Figure 1. Reworking Procedure with Heat and Stress Concentration
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