What is Epoxy: Definition and 19 Discussions

Epoxy refers to any of the basic components or cured end products of epoxy resins, as well as a colloquial name for the epoxide functional group. Epoxy resins, also known as polyepoxides, are a class of reactive prepolymers and polymers which contain epoxide groups.
Epoxy resins may be reacted (cross-linked) either with themselves through catalytic homopolymerisation, or with a wide range of co-reactants including polyfunctional amines, acids (and acid anhydrides), phenols, alcohols and thiols (usually called mercaptans). These co-reactants are often referred to as hardeners or curatives, and the cross-linking reaction is commonly referred to as curing.
Reaction of polyepoxides with themselves or with polyfunctional hardeners forms a thermosetting polymer, often with favorable mechanical properties and high thermal and chemical resistance. Epoxy has a wide range of applications, including metal coatings, use in electronics/electrical components/LEDs, high tension electrical insulators, paint brush manufacturing, fiber-reinforced plastic materials, and adhesives for structural and other purposes.
The health risks associated with exposure to epoxy resin compounds include contact dermatitis and allergic reactions, as well as respiratory problems from breathing vapor and sanding dust, especially when not fully cured.

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  1. KristinaMr

    Solving for Temp Change of Epoxy Frames for Lenses Insertion

    Homework Statement This is the problem. A pair of eyeglass frames is made of epoxy plastic. At room temperature (20.0°C), the frames have circular lens holes 2.20 cm in radius. To what temperature must the frames be heated if lenses 2.21 cm in radius are to be inserted in them? The average...
  2. Faraj Sungkar

    Non-halogen fire retardant composite (Mgoh2 - Epoxy)

    Hello, I'm currently doing research for my thesis about non halogen fire retardant composite. One of the main result is deviate and confusing because: There is no fire retardancy's effect of Magnesium Hydroxide addition to resin epoxy. Why?Any suggestions? Thanks
  3. B

    Differences Between Ordinary and Steel Epoxy Adhesives for Steel Materials

    how is ordinary epoxy (A + B) adhesive differed to steel epoxy (A + B) adhesive in so far as steel is concerned?
  4. D

    How to determine polyester epoxy content in drybend?

    I have a powder dry-bend mixed from polyester epoxy resin, fillers, pigment, other additives... I'm seeking for a method to analyze percentage weight of polyester epoxy content in this powder. So, could you prove an appropriate method to do it? Thanks
  5. S

    Electrical Can I Use JB Weld to Build DIY High Voltage Vacuum Feedthroughs?

    I want to build high voltage feedthroughs (vacuum) from epoxying pieces of alumina together, and then epoxying alumina strips on the outside to cover the spaces between. Can I use JB weld, as far as things go electrically? People have reported that JB weld is unexpectedly wonderful for vacuum...
  6. N

    Need guidance on using epoxy resin to fix floor issues?

    Hi guys, I recently got my hands dirty renovating my house. Learned a lot. I want to fix a floor in one room, want to try epoxy resin for this. Surprisingly, googling was less than satisfactory. Yes, I got it, many epoxy resins are wonderful and there are gazillions of them. That's not...
  7. R

    Making a Nylon - Fibre Composite

    Hi, I was tasked to design a composite material that will undergo a 3 point bending test. Maximum deflection will be of 15mm and a maximum load of 5kN. The scope of this task is not to prevent failure but to analyse the composite and learn from the design process. Nonetheless the composite...
  8. B

    Designing with Thermal expansion in mind

    Hi, I am trying to design a tubular probe that's made of stainless steel (304), from what I've read it has a Thermal expansion coefficient of around 9.6 x10^-6 in/in/F give or take on the quality. I want to fill this tube halfway with an Epoxy, however from what I've read this epoxy has a...
  9. M

    Process in which catalytic Agent provides -OH or -O (Epoxy)?

    Dear all Kindly anyone suggest me any Process in which catalytic Agent provides -OH or -O (Epoxy) and then after forming Product takes back -OH or -O. We have to consider only these functional groups -OH or -O. Thanks in Advance.
  10. Y

    Epoxy Conductivity, Expansion & Contraction

    What is the conductivity of epoxy when dry? Also is there any expansion or contraction when epoxy cure? That is if you fill epoxy in a gap, would it pull or push the two side when dry? Thanks
  11. M

    Journal Bearing Steel Epoxy Repair?

    A camshaft journal bearing was damaged due to oil starvation. after camshaft is replaced. Using a proper epoxy resin to fill in the damaged / pitted journal surface then honing the journal back to the standard size. After that adding groves or small pits that would work as oil pockets...
  12. S

    Pulsed NMR: T1 and T2 Relaxation Times of Curing Epoxy

    I'm currently in an advanced laboratory for physics majors, and I'm conducting a pulsed NMR experiment. My partner and I decided that we we're going to measure the T1 and T2 times of Epoxy. The idea is to explore the relationship between curing epoxy and changing T1 and T2 times. We have results...
  13. R

    Iron Powder + Epoxy Armature for Generator

    Any have good results by mixing iron powder and epoxy, purpose is to create an armature for a generator.
  14. U

    Need physics explanation for defects after epoxy cure

    Qn:Why do bubbles like this form? -My guess is that intially air trapped in the liquid before cure expands in all direction(to maintain equal pressure) during curing, as curing shrinks the epoxy, causing bubbles to form. (Or is it the heat which expands it?) Microscope picture of bubble...
  15. U

    Investigating effects on epoxy adhesive

    Hi, I am currently doing a scientific research regarding epoxy adhesive. Basically, you shine UV light onto the adhesive, it hardens. Im given certain parameters like, intensity of UV light and duration of exposure. I am supposed to investigate effects of varying parameters on...
  16. G

    Electrically Inert Glue / Epoxy

    Hi I'm looking for a super glue/epoxy that meets the following requirements: 1) when hardens is very very strong and durable and very resistance to abuse either mechanically or chemically etc 2) needs to be electrically inert, meaning that it should not be conductive or affect electronic...
  17. S

    Epoxy vs. Polyester Resin: Which is Better for Your Project?

    Can anyone give me a quick comare/contrast of Epoxy and Polyester Resins? and what application they are better for? thanks
  18. S

    Exploring Carbon Fiber Products: Resin & Epoxy Questions

    I am starting to learn how to make carbon fiber products i am not sure about what type of resin/epoxy? to use does the resin/epoxy give it that nice exterior? or is something else needed? any suggestions in general would be much appreciated thank you
  19. K

    What is the Absorption Wavelength of Epoxy Groups?

    Dear Fellow scientists, I have a small but important problem: I need to know the absorption wavelength of epoxy groups. To be more precise, these epoxy groups are bound to an agarose affinity resin via a -((CH)2)12- Spacer. Does anybody know a particular reference or chemistry book I should...