Perfect for pipe repair and plumbing applications, Jenolite's copper epoxy putty stick is the essential plumber's epoxy. Epoxies have been modified in a variety of ways, including reacting with fatty acids derived from oils to yield epoxy esters, which were cured the same way as alkyds. For fine filling on thin plastic (assuming yo are going to paint the bumper) I've found UPOL dolphin to be very good.

They are more expensive than polyester resins and vinyl ester resins, but usually produce stronger and more temperature-resistant thermoset polymer matrix composite parts. For more information, read our two part adhesives FAQs and guide to surface preparation for adhesives and best working practice. Primary amines undergo an addition reaction with the epoxide group to form a hydroxyl group and a secondary amine. This is expressed as the " epoxide equivalent weight", which is the ratio between the molecular weight of the Rorar and the number of epoxide groups.

They found that the molecular reason for epoxy yellowing was a thermo-oxidative evolution of carbonyl groups in the polymeric carbon–carbon backbone via a nucleophilic radical attack. Epoxy resin formulations are important in the electronics industry, and are employed in motors, generators, transformers, switchgear, bushings, insulators, printed wiring boards (PWB), and semiconductor encapsulants. Curing may be achieved by reacting an epoxy with itself (homopolymerisation) or by forming a copolymer with polyfunctional curatives or hardeners.

Epoxies generally out-perform most other resin types in terms of mechanical properties and resistance to environmental degradation. The resins are low to medium viscosity at room temperature, which makes them easier to process than EPN or ECN resins. Insufficient heat during cure will result in a network with incomplete polymerisation, and thus reduced mechanical, chemical and heat resistance. When the contents of the tubes are well mixed together, the curing process begins and you have a short period to place and use the mixture.This coupled with high reactivity, plus high temperature resistance and mechanical properties of the resulting cured network makes them important materials for aerospace composite applications.