In this episode of Tale of the Tape, Matt Tempelis walks you through a demonstration testing the bond strength of stainless acrylic pressure sensitive adhesive tape.
Transcript:
Hello and welcome to another episode of Tale of the Tape. I'm Matt Tempelis, president of Engineered Materials and your Minister of Tape. Today we are going to have an exciting demo episode.
Last week we talked about acrylic pressure, sensitive adhesives, the broad category. Today we are going to do a demo with acrylic pressure sensitive adhesives. So last week I made up two panels, one with a high surface energy material, a stainless steel, the next with a very low surface energy material poly. This is a medium density polyethylene panel.
I took four different acrylic pressure sensitive adhesive tapes that I'll talk to you in just a second about. I laminated first those different tapes onto a six inch by one inch, two mil thick aluminum foil. Then I laminated three inches of the tape to that foil. After I had made those bonds, I peeled the backing off of here and I bonded those to the panel. I made sure the panels were clean. And I also put good tape wipe pressure onto the substrates, made sure we had great bonds. They've now been sitting for over a week. Typically, the bond strength, acrylic pressure, sensitive adhesives will gain strength over time. After 72 hours, you're usually talking about very close to 100% strength. Each one of these tapes is a five mil tape except for one.
Let's see if there's a perceived difference or a visual difference to bonding these four different tapes to stainless steel. That's a high surface energy substrate. I expect all the tapes to bond quite well. We are testing a very firm acrylic from 3M that has very strong overlap, shear strengths, upwards of 80 pounds per square inch of dynamic shear right there. A couple of general purpose tapes from 3M is a hot melt acrylic, the other is a solvent acrylic. There are differences that you'll see in characteristics. Don't expect to see them today on this the stainless and then we have the 9472LE a low surface energy bonder that we can see here as well.
So let's start with the firm acrylic and see if we see any difference here. Oh, that's a pretty darn good bond. It's definitely not easy to pull, but a great bond to stainless.
Let's then test the general purpose hot melt product that does feel like it's also got a great bond. No noticeable difference. If we were on an Instron, we'd see a pounds per inch of width difference between these two tapes, probably of about 20 ounces per inch of width.
Now we got the next general purpose tape. That is actually, that is a tacky tape. It is very strong peel and it is not easy to get off.
And then lastly, the low surface energy bonding tape, also a very good bonding. You can definitely feel that that's not quite doesn't feel quite as strong as the couple of general purpose and the firm tape.
But overall, we're talking about a great bond that we saw on all of these tapes. With the four different acrylic PSA tapes that we bonded to this stainless steel panel, we didn't notice a measurable difference in terms of peel adhesion that we did with the 90 degree peel by hand.
Next week we'll be doing the exact same test with the exact same four adhesives, but we'll be doing that with a polyethylene panel and we'll see if those lead to different results. Thank you for joining us on Tale of the Tape. Please join us next time. And remember, at Engineered Materials, we engineer materials to the exact part that you need.
