What is the process called when liquid epoxy turns into a hard solid?
AnswerCuring
Epoxy hardens by curing, a chemical reaction that links molecules together rather than simply drying.
Science · Facts & stats
Epoxy facts & stats
8 fact-checked facts about epoxy resins, each with the reason behind it. 4 more are in today's round and join this page after it closes.
The basics
Epoxy resin belongs to which broad group of materials?
AnswerPolymers
Cured epoxy is a polymer, a material made of long, linked chains of molecules.
Going deeper
Why does mixed epoxy get warm as it cures?
AnswerThe curing reaction releases heat
Epoxy curing is an exothermic reaction, meaning it gives off heat as the resin and hardener react.
In epoxy work, what does 'pot life' mean?
AnswerWorking time before the mix gets too thick to use
Pot life is how long mixed epoxy stays workable before it becomes too thick to spread or pour.
Epoxy is a thermosetting plastic. What does that mean?
AnswerOnce cured, it will not melt back into a liquid when heated
Thermosets form permanent cross-links as they cure, so unlike thermoplastics they do not remelt when heated.
Why does a large mass of mixed epoxy cure faster than a thin layer?
AnswerHeat builds up and speeds the reaction
In a thick mass the heat from the reaction can't escape easily, and the extra heat makes curing go faster.
Expert level
In carbon fiber composites, what role does epoxy usually play?
AnswerThe matrix that binds the fibers together
In fiber-reinforced composites the fibers carry the load and the epoxy matrix holds them in place and transfers stress.
Which class of chemicals is commonly used as hardeners for epoxy resins?
AnswerAmines
Amines react with epoxide groups to open the rings and cross-link the resin, making them common epoxy hardeners.
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