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Thermosets are 3-D molecular structure and which tends to decompose on hardening. The composition of resins can leads to a change in their properties. To induce flexibility, the thermosets are retained for long period of time in a partially cured condition [9]. Generally, the condition of fiber material (chopped, aspect ratio) in resins decides the final application of thermosets. The thermosets are generally fabricated direct condensation polymerization followed by rearrangement reactions to form heterocyclic entities. The water as reactant product hinders the development of voidfree composites [10]. Figure 2.4 represents important kinds of thermosets: