There's No Best Material. Only the Right One for Your Situation.

If you're trying to decide between PTFE (Teflon), a polyurethane coating, or nylon for an industrial part or surface, I get it. I've been there. And honestly, I made a mess of it the first few times.

I've been handling material specification orders for industrial maintenance and production lines for six years now. In that time, I've personally made three significant mistakes, totaling roughly $4,300 in wasted budget - not counting overtime, shutdowns, and the very awkward conversations with my boss.

The thing is, these three material families look similar on paper but behave completely differently in the real world. There's no universal answer. The material that handles a hot chemical pump seal will fail completely as a conveyor gear in a humid plant.

So here's how I eventually learned to think about it - not as a material catalog, but as three separate questions:

  1. Is heat or chemical exposure your main concern? Look at PTFE.
  2. Is mechanical wear, strength, or bearing load your main concern? Look at nylon or another engineering thermoplastic.
  3. Is surface protection your main concern? Choose between a Teflon™ coating spray and a polyurethane coating.

Each path is its own decision. Here's what I learned the hard way.

Scenario 1: The Heat Problem - PTFE Temperature Limits

PTFE is the obvious starting point when you have high temperatures and aggressive chemicals. The polymer backbone is basically a fortress in most industrial environments. But here's where I made my first expensive mistake.

Mistake #1: Confusing Peak Temperature with Continuous Service Rating

In March 2023, I was sourcing gasket material for a steam line that spiked to about 300°C during startup, then settled around 230°C. I looked at the PTFE spec sheet, saw that PTFE's melting point is about 327°C, and thought, "We've got nearly 100 degrees of margin. This is fine."

It wasn't fine. PTFE's continuous service temperature tops out around 260°C depending on grade. The 300°C spikes weren't melting the gaskets, but they were accelerating creep and deformation. We got about four weeks of service before the gaskets started leaking.

The reorder cost $1,100, and the plant had to shut down for three days while we replaced them. (Which, honestly, made the gasket cost look like pocket change.)

What I should have known before ordering:

  • PTFE continuous service range: roughly -200°C to +260°C, depending on the specific grade and fillers like glass or carbon.
  • Peak temperature excursions can go higher than 260°C, but every spike shortens the lifespan of the part. If you're above 260°C as steady state, PTFE alone isn't your answer.
  • "Teflon" is a brand, not a single material. DuPont's Teflon line includes many PTFE grades plus coatings with different properties. A Teflon-coated release surface and a machined PTFE pump seal are different products made for different jobs.

The fix for my situation: I ended up with a glass-filled PTFE grade that held up to the spikes much better. But I should have asked the question from the start.

Scenario 2: The Mechanical Problem - Plastic vs. Nylon

When the concern is wear, impact, or bearing surfaces, nylon is the default answer everyone jumps to. I did too. But "nylon" is not one material, and "plastic" is not a single category. This cost me mistake number two.

Mistake #2: Assuming "Plastic" Meant "Nylon"

In September 2022, I ordered machined nylon bushings for a packaging line because the original part was marked "plastic" in the equipment manual. I assumed 'same specifications' meant identical results across vendors. Didn't verify what the original material actually was. Turned out it was acetal (POM), not nylon.

Nylon absorbs moisture. The packaging line ran in a high-humidity washdown area, and the nylon bushings swelled over about six weeks. Clearance closed up, the shaft seized, and the line stopped. 64 bushings at $890 total machining cost, all scrap.

Here's the rule I now use:

  • Nylon (PA6 or PA66) - tough, excellent wear resistance, high strength-to-weight. But it's hygroscopic: it absorbs water and dimensions change. Ideal for gears, bushings, and conveyor parts in relatively dry environments.
  • Acetal (POM) - low moisture absorption, dimensionally stable, naturally low friction. Better than nylon in humid or washdown environments. If I remember correctly, acetal also machines a bit cleaner than nylon, which matters when you're paying for tight tolerances.
  • DuPont Multibase thermoplastics - these are custom-engineered plastic compounds where you spec the base polymer plus fillers and additives (glass, carbon, lubricants, flame retardants) to hit exact requirements. If your application has unusual demands, a tailored compound can beat an off-the-shelf nylon or acetal.

If someone asks me "plastic vs nylon" as a general question, I remind them: nylon is a plastic. What they usually mean is "nylon vs other engineering thermoplastics," and the answer depends on the environment. Humid or wet? Acetal. Dry with high mechanical stress? Nylon is hard to beat.

Scenario 3: The Surface Problem - Teflon Coating Spray vs. Polyurethane Coating

This is the one that confuses the most people I talk to, because the applications look similar. You have a metal surface that needs protection, and someone in the shop says, "Just Teflon-coat it." Or worse: "Just put some polyurethane on it."

Mistake #3: Using PTFE Coating as a Wear Barrier

I had a slide gate on a hopper that was galling in its tracks. I cleaned it up and applied a DuPont Teflon coating spray (the PTFE dry-film kind). It worked great... for about two weeks. Then the coating was gone and the galling came back.

Here's what I didn't understand until a technical rep explained it to me (patiently): PTFE spray coatings provide lubricity and release. The polymer is famously low-friction, but it's also soft. Under sliding contact, it wears through. If I'd needed a release surface - like mold release or preventing material from sticking - the PTFE spray would have been the right call. But I needed abrasion resistance, and PTFE is pretty much the worst material for that.

Polyurethane coatings, on the other hand, are the opposite. They handle abrasion, impact, and weather exposure like a champ. But they don't have the low-friction, non-stick character of PTFE.

  • Need non-stick release or low friction? DuPont Teflon coating spray (PTFE dry-film or liquid).
  • Need abrasion resistance, impact protection, or weather resistance? Polyurethane coating.

If you genuinely need both - low friction and abrasion resistance - you might need a two-layer system or a specialized coating. That's when you call a coatings specialist instead of grabbing a spray can. I eventually did what I should have done first, and the slide gate has been running for over a year without trouble.

How to Tell Which Scenario You're In

Here's the checklist I use now for any material or coating request that comes across my desk. It's caught potential problems on seven orders since I started using it. (Should mention: that's per our team's records, which I keep for exactly this kind of review.)

  1. What temperature does the part actually see? Both continuous and peaks. If you're over 260°C continuously, PTFE alone won't save you.
  2. What's the chemical exposure? PTFE resists almost everything. Nylon handles oils but not concentrated acids. Polyurethane breaks down in strong solvents.
  3. What's the mechanical load? Sliding, impact, abrasion, pressure? High wear means nylon, acetal, or a polyurethane coating - not PTFE.
  4. Is moisture present? Humid or washdown environments rule out nylon unless it's specially modified.
  5. Are you coating a surface or making a solid part? Coatings = Teflon spray vs. polyurethane. Solid parts = PTFE, nylon, acetal, or an engineered compound like DuPont Multibase.

One more note on data. Material specs change, and property tables are written under controlled conditions - not in your actual plant. What I've shared here was accurate as of my projects in 2022-2024. DuPont and other manufacturers update product lines and formulations, so verify current technical data before committing to a purchase.

Also, if you're making environmental claims about whatever coating or material you pick (like "recyclable" or "PFAS-free"), be careful. Per FTC guidelines (ftc.gov), environmental claims have to be substantiated through proper testing or certification. Someone in marketing once asked me to call a PTFE coating "eco-friendly." I said no. (Not that I'm a lawyer - but I didn't want to find out what happens if you get that wrong.)

I still make small mistakes. Last month I specified the wrong durometer on a rubber wiper blade and had to eat the cost of 40 units. But the big, expensive material failures? Those are behind me, and the checklist is why.

The cheapest material is the one you spec correctly the first time. I wish someone had told me that in 2022.