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Liquid epoxy resins in their uncured state are mostly classed as irritant to the eyes and skin, as well as toxic to aquatic organisms. [8] Solid epoxy resins are generally safer than liquid epoxy resins, and many are classified non-hazardous materials. One particular risk associated with epoxy resins is sensitization.
Alternately, resin casting may be accomplished with a resin plus a nearly equal amount of a "hardener" liquid (as in many epoxy resin or polyester resin systems), which functionally contains a second polymer, for use in forming a final product plastic which is a copolymer. Copolymers contain two different alternating chemical entities in the ...
Epoxy resin: Thick, high-gloss, and transparent. Some formulations can cloud or yellow with UV exposure High level of protection Flexible and durable Safe when cured Easy pour-on application for flat surfaces, difficult to apply evenly on more complicated shapes Cleanable with acetone when liquid. Irreversible once cured
Elmer's Cascamite Glue. "Easy to mix, dry powder urea resin glue, for wood, fiberboard, and other porous materials" had to be mixed with water. Elmer's Glue-All was introduced in 1947; packaging c. 1976. Elmer's School Glue was introduced in 1968; packaging c. 1976. Elmer's washable, no run, School Glue
Synthetic resins are of several classes. Some are manufactured by esterification of organic compounds. Some are thermosetting plastics in which the term "resin" is loosely applied to the reactant(s), the product, or both. "Resin" may be applied to one of two monomers in a copolymer, the other being called a "hardener", as in epoxy resins. For ...
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