Epoxy Adhesives That Cure by Indirect Heating

4 EPOXY ADHESIVES THAT CURE BY INDIRECT HEATING 

One of the major disadvantages of using structural epoxy adhesives is the cost and time required for long cure cycles. The number of fixtures, energy use, and production times (either at room temperature or in an oven) required have discouraged many from exploring epoxy adhesives as an alternative to mechanical fastening. 

One approach to solve this problem has been the development of fast-reacting room temperature curing epoxy adhesive systems, as discussed in Chap. 11. However, they often result in brittle joints, poor adhesion due to reduced time to achieve substrate wetting, and 

Properties Vinyl chloride-A Acrylic-A Styrene- Butadiene Acrylic-B Vinyl chloride-B Vinyl chloride-C 

These processes have an advantage in that the heat penetrates deeply into the joint and into the epoxy material itself. With conventional thermal energy processes, the heat must be conducted into the mass of the epoxy adhesive from outside the joint. This is hindered by the presence of the substrates, the substrate geometry, and the relatively low thermal conductivity of the epoxy itself. 

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