Which Epoxy is Best for Plastic? Let's find out!Jun 09, 2021
In a recent video, we tested several Pock C's from well-known brands to glue together two pieces of steel. The results were quite impressive, with J-B Weld Original and DEF CON winning, although the
plasticis much more difficult to glue. It's a lot harder to get a good joint, so we're going to use the original work of JB Weld, as well as these other proxies in front of me that are designed specifically for
plastic, so today we're going to try JB Weld. Jb Welds original Bhandar gorilla plastic. plastic fusion super glue and Loctite ultra gel super glue to determine
whichof these epoxies is
bestfor bonding a plastic part to a steel part ok, I consulted an expert in the field of epoxies and they advised me that when using plastics out very Be careful with the type of solvent you use to clean the surface and I recommend using isopropyl alcohol instead of something like acetone because acetone can cause microfractures in the plastic.
I have let these epoxies sit for four days and they are also 5/8 inch bolts and four inches long. I'll start testing first using gravitational force when it comes to applying weight. I want to make sure that I apply this weight right on the end of this bolt and I don't want to be on the inside and I have to apply the weight in exactly the same place because when it comes to applying weight and when it comes to physics, even being on the outside of an eighth of an inch makes a big difference in the accuracy of this. test, we include the chain count, this is right 8 pounds, okay with the chain weight, this is about 11 pounds, the only one left, the only survivor left is jay-z, well, I have to I admit that I am quite surprised that JB Solder outperformed these epoxies that are designed specifically for plastic.
According to each of these products, they are designed specifically for plastic to metal or plastic to wood or plastic to some other substance, so let's take a close look at each of these to see what caused the failure, well, the
epoxydid a very good job of adhering to the steel, there is only a small exposed area of steel, about 95 percent of the
epoxyis still on the steel, so the failure occurred because the epoxy did not stick to the surface of the plastic . remained on the steel, this super blue plastic fusion failed, the fuse of the plastic itself, you can see the gorilla is still hanging on a thread of epoxy and what is very interesting to me as it seems to me that the gorilla failed on both .
He notes that it sort of came off the steel and plastic, so the gorilla didn't do a very good job of sticking to either surface. JB, well, the plastic Bhandar actually bonded the dough to the steel and then to the plastic, as you can see. it clearly separated from the plastic and remained on the steel competition of the JB blenders by a pretty considerable margin of over a pound, so if you look at this, it looks to me like the JB weld failed on the top and didn't stick to the plastic. In addition to the steel, that being said again, it did not do a superior job on the other products as far as adhesion, the second test to be performed includes a twisting motion, so I have this setting at three pounds per inch again if we need feet. pounds we will use a larger torque wrench.
What I want to avoid is that I don't want total force to prevail. I don't want to push down, so I'll try to be very careful to hold the weight in a balanced manner with my left hand while I'm spinning to make sure I don't cause failure due to a downward force 35 pounds per inch, well GB, plastic union, was the first to fill 35 pounds per inch, 40 pounds per inch well, gorilla was the second to fail with 40 pounds per inch 75 pounds per inch 90 pounds per inch one hundred ten pounds per inch 115 pounds per inch the control of Loctite ultra glue gel held on so well that the plastic broke down before the epoxy did the plastic fusion of the super glue do a pretty good job, but it didn't actually fuse with the plastic as much as it did.
The steel gorilla once again failed almost 50/50. There is still quite a bit of epoxy on the steel, but there is also some epoxy on the plastic. the JV bolt well, plastic Bhandar, it stuck to the steel better than the plastic and this plastic binder also couldn't compete well against these other epoxies, okay about half of the epoxy stays on the bolt and about half of the epoxy remains in the steel. Okay, next step is the deathblow test. We all know that any time you have a plastic stuck to something, there will be vibration and impact, so what we were measuring here is the ability of the epoxy to withstand a sudden shock.
This is extremely important. Probably the number one reason I use epoxies for this on most projects is the reason they fail, so what we're going to do is take the wrench and place it above and beyond the head of the bolt and just we're going to drop this key and allow it to impact 10 times and on the tenth impact we're going to move up and weigh and we're going to continue until each of these fails, now each of these keys has a larger diameter hole and each of these keys it weighs more as the wrench gets bigger, so I'm going to provide both the size and the weight of each of these wrenches and we'll go down the line and see where does each of these fail?
This fatal blow impact test was very revealing and demonstrates exactly why you need to match the epoxy to the application. What we noticed was that some of the epoxies that are not as strong had an absolute effect. Excellent job handling a deadly impact because they have more give with less force, so let's take a look at each of these and see why they failed. The Loctite super glue did a great job of sticking to the steel but not the plastic. Block Tight super glue is just a very hard glue, very rigid and it simply will not withstand any type of vibration or impact compared to some of the more flexible epoxy super glues.
Plastic fusion again, it's just one of those very, very rigid, hard, flexible ones. Epoxies that simply do not resist any type of vibration. Gorilla did an amazing job in this category because it's very flexible, if you feel gorilla glue, it's just not a very hard glue, it stays very gummy, okay JB, well, plastic binder once again. It was disappointing, it's a very hard epoxy that just doesn't seem to adhere to the plastic very well. I'm still very impressed with the original j-b weld because it's not even designed or designed specifically for plastic, but it came in first place in this test and as you can see it released from the plastic and stayed stuck to the metal very well, but JB Weld is one of softer epoxies compared to Devcon, so it provides a really good combination of flexibility and strength.
The purpose of these endings. Calling the testing nothing more than a demonstration is simply taking a look at how much flexibility this epoxy has before it fails. What I'm going to do is pull this bolt in my direction and we'll see how far. this will flex before releasing, you see a lot of flex there, it didn't take much force to break it, it just doesn't have much strength and doesn't seem to do a very good job. I really learned a lot from these types of projects and what I learned today was that if I need something that has a lot of flexibility, I need to make sure I choose the soft epoxy or it will fail, although a hard epoxy can be ten times stronger if it's not going to work.
Take any kind of vibration or movement, it will just fail, so I don't want to tell you
whichof these epoxies I think is the
best. I really want you to form your own opinion, but what I do want to say is that I have at least a hundred people asking me to do this project and I just want to say thank you to each and every one of you who watches the video. I really pay a lot of attention to your comments. I try to respond to as many of these comments as possible. as I can within the first two or three hours after posting a video, anyway, these projects require a lot of money and a lot of time, so I hope I have earned the thumbs up and that you will also give me good constructive feedback on how to improve these videos, so I hope you leave a comment.
I like interacting with you. I learn a lot and I just want to say thank you very much for watching the video and I hope to see you next time.
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