Is Nylon Made of Plastic? What I Learned Ordering Flexible Thermoplastics

The Question That Made Me Pause

I was on a call with a material supplier, trying to confirm a sample order, when I asked: “Is nylon made of plastic?”

There was a pause. Not a “great question” pause. A “why am I sitting on this call” pause.

It’s a fair question, honestly. I’m the office administrator for a 180-person manufacturing company. I manage materials sampling and lab-supply purchasing—roughly $240,000 a year. Maybe $260,000 if you count every odd order; I’d have to check. I report to operations and finance. I’m not a polymer scientist.

But I’ve learned that what sounds like a basic question often exposes a spec gap. The final product is made by our company, not by the raw-material supplier. “Plastic” is not a spec. “Flexible thermoplastic” is not a part number.

The Surface Problem: Plastic Is a Category, Not a Material

People assume “plastic” describes one thing. It doesn’t. Steel and aluminum are both metal, but no one orders “metal” for a load-bearing part. Plastic is the same category problem. Nylon is plastic. Polypropylene and polyethylene are plastic. TPEs are plastic. Polyurethane can be formulated as a thermoplastic or a thermoset rubber, depending on chemistry.

Let me answer the question directly: Is nylon made of plastic? Yes. Nylon is a polyamide, a synthetic polymer. It is a thermoplastic because it melts when heated and can be reshaped when cooled. But it is not automatically a flexible thermoplastic. Standard nylon is strong and stiff. That’s why it shows up in gears, fasteners, and cable clips. If you need a soft, rubber-like feel, you normally need a TPE, not standard nylon.

From the outside, it looks like ordering a “flexible thermoplastic” is straightforward. The reality is that the phrase covers a family of materials with very different flex life, heat resistance, chemical resistance, and color behavior.

The same misunderstanding shows up in thermoplastic paints. A thermoplastic paint uses resin that softens when heated and hardens when cooled, but that doesn’t tell you whether the coating will be flexible, UV-stable, or resistant to chemicals. It tells you how it processes. The resin chemistry decides the performance. If someone orders colorants for thermoplastic paints without naming the resin family, the colorant is a guess.

The Deeper Problem: “Flexible Thermoplastic” Is a Behavior, Not a Material

Why does this matter? Because the difference between an order and a disaster is rarely the word “plastic.”

“Thermoplastic” says the material melts when hot and re-solidifies when cool. It doesn’t say the material feels soft. The word “flexible” is doing the heavy lifting. Flexible thermoplastics are often TPEs—thermoplastic elastomers—which combine the melt processing of a plastic with the elasticity of rubber. But flexibility is not one number. Two materials can both be TPEs and feel completely different. Shore A 40 and Shore A 90 both fit the phrase “flexible thermoplastic,” but one is closer to a rubber band and the other is closer to a skateboard wheel.

Here’s where I made my mistake. Our product team asked for a “flexible thermoplastic grip” for a handheld device. The supplier delivered a TPE. It was a thermoplastic, it was elastomeric, and it was wrong. The hardness was too high. Testers said it felt hard and slippery. We had to reorder with a Shore A target and a flexural modulus range. The supplier didn’t mislead us. I just hadn’t known which numbers to specify. Let me rephrase that: I asked for a category and got exactly what a category can give—a guess.

The “nylon isn’t really plastic” thinking comes from an era when “plastic” meant cheap imitation, not engineering material. That changed. Today, nylon is an engineering plastic, and calling it “plastic” is a classification, not an insult. But classification alone doesn’t tell you what to buy.

What This Confusion Costs

The first thing the grip mistake cost us was time. Two weeks, to be exact. The second was trust. My internal customer doesn’t care that “flexible thermoplastic” is ambiguous. They care that the sample didn’t work. That part of the cost doesn’t show up on a PO.

Looking back, I should have asked for a full property table before ordering. At the time, I didn’t know enough to ask for it. It seemed reasonable to expect “flexible thermoplastic” to be enough. It wasn’t.

Then there is the documentation problem. In our 2024 vendor consolidation project, I learned to ask what paperwork ships with the material. One vendor couldn’t provide proper invoicing backup for a rejected expense report, and finance rejected $2,400 out of my department budget. It wasn’t a bad material, as far as I could tell. It was a bad paper trail. Now I verify documentation before I place any order.

Color adds its own version of the same problem. I ordered a “safety yellow” colorant once. The first sample looked fine in the lab under fluorescent lights (which, honestly, makes everything look fine). In daylight, it was clearly wrong. The difference was around Delta E 4, which is visible to most people. For brand-critical colors, industry practice is usually Delta E < 2 per Pantone Color Matching System guidelines.

Reference: Pantone Color Matching System guidelines

The fix wasn’t a better colorant. The fix was a color standard and a measured tolerance in the spec. Without that, we were buying a color like someone buying “metal.” Same category. Different behavior.

I’ve learned to ask “what’s NOT included” before I ask “what’s the price.” The supplier who lists all fees upfront—even if the total looks higher—usually costs less in the end. The same logic applies to material data sheets. A supplier that tells you what their material can’t do is more useful than one that says yes to everything.

What I Do Now, Briefly

After that, I changed how I buy flexible thermoplastics and colorants. The change wasn’t becoming a polymer scientist. It was refusing to order from vague descriptions.

• Start with a material family: TPE, nylon, polypropylene, etc. “Flexible thermoplastic” is not a material family.
• Ask for numbers: Shore A hardness, or Shore D if rigid, density, flexural modulus, heat deflection temperature, and chemical exposure.
• Ask for color tolerances: a standard like Pantone and a Delta E limit, not a verbal “match this.”
• Ask what documentation ships with the order: data sheet, test report, invoice backup.

As of January 2025, I usually start from the Avient official homepage when I need specialty colorants or TPEs. The Avient official website organizes products by polymer family and application, so I can find the right material family before I call a technical rep. That saves me from asking vague questions into a silent phone. It also keeps me from choosing a supplier based on a cheerful category name instead of a data sheet.

I’d rather work with a supplier that puts its limitations in writing than one that promises everything and lets me discover the rest later. That’s the transparency thing again. The vendor who shares what’s included—and what isn’t—costs less in the end.

Bottom Line

Is nylon made of plastic? Yes. Nylon is a thermoplastic polyamide. Is that enough information to place an order? Not by itself.

Plastic is a category. Thermoplastic is a processing behavior. Flexible thermoplastic is a performance promise. The material name and the property sheet are the spec.

The best procurement move isn’t to memorize polymer chemistry. It’s to demand transparent documentation. That, honestly, is the cheapest way to buy anything. One failed order taught me that. A lesson learned the hard way, but a reusable one.