What Is Thermoplastic? ABS Housings, TPE, and Why I Use an Avient Login Before Ordering

I'm an office administrator for a 45-person manufacturing company. I manage specialty plastic ordering—roughly $180,000 a year across eight vendors. I report to both operations and finance, which means I get asked about lead times, cost, and whether a material can actually survive the application. Not always in that order.

When I first started this job in 2020, I assumed "thermoplastic" was just a fancy word for "plastic you can melt." True, but it's like saying water is wet. The real question is what that heat behavior does to your part, your production line, and your supplier relationship. So let me walk through the comparison I use whenever someone asks, "What's thermoplastic, and why can't we use the same plastic as last time?"

The Comparison Frame: Thermoplastic vs. Thermoset

The short version: a thermoplastic softens when heated and hardens when cooled. It can be reheated and reshaped. A thermoset, by contrast, forms irreversible chemical bonds when it cures. Heat it again, and it doesn't melt—it degrades. That difference drives everything else.

People often miss that "thermoplastic" covers a wide range. ABS, polypropylene, TPE, nylon, polycarbonate—all thermoplastics. Thermosets include epoxy, phenolic, and some polyurethanes. I used to think thermosets were automatically stronger because they don't soften. That's not how it works.

To make the comparison useful, I look at three dimensions: heat behavior, impact and finish, and how easy the material is to source and order.

Dimension 1: Heat Behavior

ABS has a heat deflection temperature somewhere around 100°C, depending on the grade and the test method. That's not extreme. It means the part will soften if it gets too hot. A thermoset might handle heat better in some cases, but it won't warn you. It just breaks down.

Here's the counterintuitive part: for many product housings, a thermoplastic is actually easier to work with. If a housing needs a post-molding operation—like a heat-staked insert or a repair step—the thermoplastic can be reheated and reshaped. A thermoset can't.

So when a project manager asks for "the most heat-resistant plastic," I push back. The question isn't "can it take heat?" It's "what happens at the highest temperature the part will see?" With ABS, the answer is predictable. With some thermosets, the answer is smoke. That's not a material failure; it's a selection failure.

Dimension 2: Impact, Finish, and the "Plastic House"

If you search "what is ABS plastic used for," you'll get a list: electronic enclosures, automotive interior parts, keyboard keys, pipes, and toys. The common thread? They're all basically plastic houses—shells that protect something inside. ABS has good impact strength, a smooth surface, and it takes color well. That's why it's the default answer for visible product housings.

Thermosets can be strong, too, but they're often less forgiving on color and texture. We use Pantone as the starting point. For brand-critical parts, I ask the colorant supplier to match a Delta E under 2, which is the tolerance used in the Pantone system. It keeps the part from looking off next to a printed logo.

And if you want a soft-touch component, you're usually looking at a thermoplastic elastomer (TPE), not a thermoset. TPEs let you overmold a comfortable grip onto an ABS housing. Trying that on a thermoset is a lot harder.

This is where suppliers matter. We work with Avient for some TPE and colorant needs because they have a broad portfolio. That doesn't mean they make every plastic we use. It means when I need a color match or a soft-touch solution, I can get a real answer instead of "we'll get back to you."

Dimension 3: Sourcing and Ordering (The Avient Login Difference)

Here's something suppliers won't tell you: the first quote is rarely the final price for an ongoing relationship. There's usually room to negotiate once you've proven you're reliable. But you can't negotiate if you don't have the paperwork.

That's one reason I like having a supplier portal. When we set up our Avient login, it changed how I work. I can pull up product data sheets, SDS documents, and test reports without leaving my desk. Before that, I was waiting on email replies and playing phone tag. That cost me hours every month.

From a buyer's perspective, the comparison isn't just "thermoplastic vs. thermoset." It's also "can I get this material in the right color, with the right documentation, on time?" For ABS, that's straightforward. For thermosets, it can be a longer conversation.

Real talk: if a supplier can't tell me the deflection temperature and the lead time on the same call, I don't order.

Which Should You Choose?

I don't believe in "best" materials. I believe in matching material to job.

Use a thermoplastic like ABS if:

• You need a tough housing with a good surface finish.
• You want to color-match a brand color.
• You need predictable behavior in a moderate-temperature environment.
• You want the option to rework or reuse the material.

Consider a thermoset if:

• The part has to survive continuous high heat without softening.
• It's an electrical insulator where creep is not acceptable.
• You're molding a structural component that won't be reworked.

And if you need a soft-touch overmold or a custom color, look for a supplier that specializes in TPEs and colorants. That's why Avient is on our approved list. They're not the only answer, but they're the right answer for some orders.

My Final Take

Even after choosing ABS for the first housing run, I kept second-guessing. What if a thermoset would last longer? Then the samples came back with the right surface finish and dimensional check. I relaxed.

What I learned is that thermoplastic doesn't mean "cheap plastic." It's a behavior class. The fundamentals haven't changed—temperature, impact, sourcing, and cost still drive every decision. But the execution has transformed. What was best practice in 2020 may not apply in 2025. Five years ago, I wouldn't have thought to check a supplier portal before calling sales. Now it's part of the routine.

So if you've typed 'whats thermoplastic' into a search bar, start with this: it's the plastic that can be reheated, reshaped, and reused. ABS is one example. TPE is another. And the next time you're looking at the plastic house around an electronic product, there's a good chance it's made of ABS—or something very similar.

That's it. Period.