Thermosetting adhesives relative strength

Figure 4.21 Relative strengths of thermoplastic and thermosetting adhesives T is the melt temperature of the thermoplastic adhesive Tg is the glass-transition temperature of the thermosetting adhesive).

Contact adhesives have relatively high shear and peel strengths. Strength and durability approach those of structural thermosetting adhesives. A typical contact adhesive application is the bonding of decorative surface materials to wood for kitchen countertops. Parts must be correctly positioned before bonding because repositioning is difficult or impossible after the bond is made. 

Thermosetting Acrylics. Thermosetting acrylic adhesives are newly developed two-part systems which provide high shear strength to many metals and plastics, as shown in Table 7.26. These acrylics retain their strength to 200°F. They are relatively rigid adhesives with poor peel strength. These adhesives are particularly noted for their weather and moisture resistance as weU as fast cure at room temperature. 

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