What is phenolic thermosetting resin?
In most fiber reinforced composites, thermosetting resin is used as the matrix to hold the structural fibers together. Aside from phenolic thermosetting resin, there are other kinds of thermosetting resins that include epoxy, polyester, vinyl ester and urethane. Thermosetting resins are popularly used today because at room temperature they are in liquid state. This makes impregnation on reinforcing fibers simpler and easier. Once cured, thermosetting resins create extremely strong bonds to one another and it changes from a liquid state to a solid state that cannot be reshaped or reformed. Because of these properties, recycling of the reinforcing fibers can be rather difficult. The thermoset resin by itself is not actually recyclable but there are new companies that have successfully managed to remove the resin so that the reinforcing fibers can be reclaimed.
Aside from the ease of manufacturing, thermosetting resins exhibit superior properties at a relatively affordable cost. Some of the properties of thermosetting resins include:
- Excellent chemical resistance to solvents and corrosives
- High resistance to heat and temperature
- Fatigue strength
- Excellent adhesion
- Tailored elasticity
- Excellent finishing
Manufacturers use phenolic thermosetting resins extensively because of its ability to handle high temperature under mechanical load with minimal deformation or creep. In short, once phenolic resin has cured, it provides the necessary rigidity to maintain structural integrity and dimensional stability under extreme conditions. Phenolic resins can also withstand exposure to harsh chemical environments and provides the shield to the reinforcing fibers to that they will not be affected by the corrosive effects of chemicals. There is only minimal degradation to the phenolic sheets after prolonged exposure to chemicals at elevated temperatures. Burning phenolic resins produces a relatively low amount of smoke and toxic emissions. The selective use of reinforcements and fillers often enhances protection when it comes into contact with an ignition source.