Is Epoxy a Plastic?
Find out more about Epoxy, Acrylic, And Polyester Resins
Epoxy resins have been known for several decades by now, and we successfully utilize them in various areas from aircraft to arts. Due to its qualities, this substance can be transformed into a wide range of different materials that possess unique abilities.
No wonder that those who work with epoxy often enough ask whether this substance is plastic or not since knowing that will be handy when working on the creative projects.
So today we will try to figure out what sort of material it is and what basic distinctions it has compared to other related alternatives.
What Kind Of Plastic Is Epoxy?
To begin with, epoxy resins do belong to the plastics family. They are able to change their physical state thanks to which this material is widely used in our homes and daily life:
- It can be found in the cans of the soft drink and in special packagings as a lining for the content protection and for keeping the flavor inside of the tank.
- This material is frequently utilized as a protective coating on different objects from beds and garden furniture to bicycles and hospital beds.
- This substance can be found in special paints that are meant for the surfaces of ships and wind turbines to protect them from bad weather conditions.
- Epoxy resins can also be applied in paints and coatings, composite materials, and adhesives
- Industrial tooling, electrical systems, and electronics are other areas of this material usage.
Epoxy Properties
Epoxy resin is a truly miraculous invention. It is able to change its physical state from a low viscosity liquid to a solid with a high melting point. Moreover, this substance can be successfully mixed with different hardeners and curing agents which allows it to form the materials that will have a unique combination of properties.
Epoxies, however, have a list of additional, the same outstanding characteristics:
- superior adhesion
- chemical exposure resistance
- heat resistance
- mechanical properties
- electrical insulating properties of high quality
Besides, most of these characteristics can be modified, for instance, if we fill epoxy with silver, it will become a good electricity conductor whereas initially, this material is insulating. This feature makes epoxies irreplaceable for the industry’s needs.
Distinctions Between Epoxy, Acrylic, And Polyester Resins
When it comes to choosing what substance will be the most suitable for certain purposes, no matter whether in crafting or not, people who are not quite familiar with all those materials may be confused and feel lost: which one to pick up?
Since the three most popular variations are epoxy, acrylic, and polyester resins, we would like to introduce you to the basic distinctions between them to make it simpler to tell the difference next time you will need any casting material.
1. Epoxy vs acrylic
Let’s begin with a reasonable question: what is acrylic resin? Clear acrylic resin is a thermoplastic. It means that acrylic casting resin belongs to the plastics that can be heated repeatedly many times.
Liquid acrylic resin is mixed from acrylic polymer. This substance is extremely smelly and makes use of toxic components during the production.
The distinction between the epoxy and acrylic resin is that epoxy belongs to the group of thermosetting plastics which make use of heat to harden into a solid mass that will not melt down under the high temperatures. Besides, it is way less stinky compared to the acrylic casting resins.
Unlike the acrylic resin, epoxy will not be water-clear, moreover, it will not resist the UV degradation.
Is it possible to substitute epoxy for acrylic? Well, generally no, these two can not be used as substitutes for each other.
However, epoxy resin can be shifted to a plastic alternative if you are looking for cheaper casting material.
2. Epoxy vs casting resin
If you have wondered what makes these two substances different, then you can finally get a clear answer.
Several major differences between epoxy and resin exist:
- Casting resin has a thinner viscosity.
- Casting resin needs more time to cure.
- It has way longer working times, unlike the epoxy whose working times are short. Because of this, casting resins will set up much slower if compared to epoxy counterparts that need only 25 minutes to gel.
- Epoxy resin needs to be poured in a thin layer whereas the casting resin can be applied in thicker covers.
- Finally, epoxy resin is simpler to mix since it doesn’t need the ratios to be measured super accurately. On the contrary, if casting resin is mixed improperly, it may affect the result dramatically.
Because of these distinctions, casting resin is runnier than epoxy which creates certain problems when using it as a coating material. Besides, casting resin is less hard than epoxy, and is more prone to yellowing when exposed to the UV light.
Also, casting resins normally need between thirty-six and forty-eight hours to cure whereas epoxies will require twenty-four hours at most.
On the other hand, casting resins can be poured in very thick layers (even of several inches) which makes them perfect for certain projects like figurines-making, molds, or river tables.
3. Polyester resin vs epoxy
Liquid polyester resin belongs to the thermosetting plastics. It means that both make use of heat to transform into a solid mass resistant to melting.
It is a syrup-like clear liquid that is blended with a small amount of a strong catalyst. This allows the curing mass to heat up but it will also make it craze if we add too much of catalyst.
Polyester resin is rather multipurpose stuff: it can be utilized as a coating, serve as a casting material, and even build up composites.
When comparing polyester vs epoxy resin, there is one more significant distinction, and that is the odor: polyester resin is also evil-smelling stuff, unlike the epoxy which is way less stinky.
So now it will be simpler for any beginning craftsman to figure out which substance to choose when heading for the next creative project.
What are polyepoxides? Do they have something in common with epoxy?
Polyepoxides is the name of a class of epoxy resins, so yes, epoxy is one of them.
Is epoxy resin toxic? My kid wants to start an epoxy resin class, but I’m concerned about the safety.
Well, I’m not sure whether you can call it toxic, but epoxy resin is harmful indeed. The chemicals in epoxy resin can affect your health when they come in contact with your skin, or if they are inhaled in a form of mist or dust. This is why yuo must work with epoxy in a well-ventilated space wearing protective gear.
Hi! Could anyone explain what polyester resin is used for? Can it be used for home DIY projects?
I’m not sure it can be used for any DIY and/or crafting purposes. This type of resin is mainly used in the construction industry, automotive industry, and industrial wood and furniture finishing.
Is epoxy resin a thermoset plastic?
Yes, epoxy is one of the types of thermoset plastics. Other common examples of thermoset plastics and polymers include silicone, polyurethane and phenolic.
Is epoxy resin biodegradable? How safe is it to use it?
I’m not a pro, but I know it’s considered biodegradable. However, since epoxy resin isn’t 100% organic, it can’t fully decompose, even though it is biodegradable.
Does epoxy make plastic toxic?
No, it doesn’t. But epoxy itself can be harmful if you swallow it, for example, or if you inhale its fumes for a long time.
Does epoxy melt plastic? Is that ok if I use it for fixing my plastic garden buckets?
Of course it doesn’t melt plastic! Epoxy itself is a sort of plastic, so how can it melt the same material? And surely, you can use it for repairing any plastic object.
Is epoxy resin a thermosetting plastic? Does anyone know?
Yes, as far as I know, epoxy resin is one of the thermosetting plastics. Others are polyester resin, and a couple of others which names I don’t remember (only know they have formaldehyde in them).
I need to fix my large garden table that’s made of plastic, and my friend said epoxy would be perfect for that. But which epoxy is the best for plastic? I mean, what brand or what type of it?
I use Gorilla 2-Part Epoxy. In my opinion, it’s the best epoxy for plastic ever! It’s super strong in terms of bonding, and besides, when it dries, it creates that nice glossy finish. Just awesome!
Is epoxy a type of plastic?
Yes, epoxy is a type of plastic indeed. It’s more stable than epoxy, and it also contains fewer impurities.
Does epoxy putty work on plastic? I know it can be used on wood, ceramics, metal, brick and concrete. But I can’t find any information about plastic. Did anyone try using it for the plastic objects? How did it work?
I’m not sure whether it depends on brand somehow, but the putty I used was perfectly fine for plastic. It even worked on wet plastic, since I wiped the surface with the damp cloth first to remove the dust.
Is epoxy safe for plastic cups? Those cups are used for drinking so I’m not sure whether this adhesive will be safe.
I’m not quite sure, but I remember I read that epoxy was examined for dangerous compounds in it in terms of using this resin for tableware. And the research showed that epoxy did contain low levels of BPA, but they were safe for intake.
Hi! I need to fix my plastic garden furniture, and I was thinking of using epoxy for it. To repair cracks, etc. But I’ve never used this sort of adhesive on such material. Is epoxy good for plastic? Does anyone know?
Hey there. Yes, epoxy is perfectly fine for plastic. I used it many times for this sort of fixing projects, and I was always super happy with how it went. Actually, I still opt for epoxy if I need to glue anything that implies plastic objects.
Will epoxy bond plastic to metal? I know it can attach similar materials, like plastic to plastic or wood to wood, etc. But what if I need to stick plastic to metal? Will it work with epoxy?
Definitely it will! I can even tell you that epoxy is the best choice for this type of adhesive work!