That Phone Call That Made Me Question Everything
Last April, I got a call from our engineering lead. He said, "We need a large plastic container—about 200 gallons—that can handle some solvent exposure and isn't going to crack in the cold." I nodded, jotting notes. Then he added, "And by the way, we're also looking at some carbon fiber prototypes, but let's start with the basic stuff."
Basic stuff. That's what I thought too, until I started digging into material specs. I'm a procurement manager at a mid-sized manufacturing company—we spend about $180,000 annually on plastics and compounds. Over the past 6 years of tracking every invoice, I've learned that the "basic stuff" is rarely basic when you look at total cost of ownership (TCO).
One question kept tripping me up: Is nylon a plastic? Sounds simple, right? But when you're comparing polyethylene (PE), polypropylene (PP), ABS, polycarbonate (PC), and nylon for a large container application, the answer matters for cost, performance, and compliance.
Going Down the Material Rabbit Hole
I started with the obvious: contacting three suppliers. One of them was Toray. Now, when I hear "Toray," I usually think carbon fiber—T300, T1000, that high-performance stuff with tensile strength above 3530 MPa. But Toray also has a massive plastics division: Toray Plastics America, Toray Resin, the works. They make everything from PE and PP compounds to specialty nylon grades.
Here's where it got interesting. Supplier A quoted me a standard polyethylene drum—cheap, around $42 each for the container. Supplier B offered a polypropylene alternative, about $68. Toray's sales rep—let's call her Sarah—emailed me a detailed comparison sheet. She didn't just quote a price; she listed polyethylene plastic density (0.92–0.96 g/cm³ for HDPE, she noted) and explained how it affects impact resistance at low temperatures.
I went back and forth between the polypropylene option and Toray's recommended PE compound for two weeks. PP offered better chemical resistance on paper. But Toray's PE had a specific additive package—they called it a "density-modified grade"—that boosted impact strength without much cost increase. Sarah also mentioned they could supply nylon if needed, but warned that for a 200-gallon container, the cost would jump significantly.
The Nylon Question
So, is nylon a plastic? Technically, yes. Nylon (polyamide) is a thermoplastic polymer, just like PE or PP. But the way it's processed and its performance characteristics make it a specialty engineering plastic, not a commodity. I asked Sarah: "If I use nylon, what am I getting for the extra cost?"
She broke it down:
- Nylon has higher tensile strength (up to 80 MPa for some grades) vs. HDPE (around 30 MPa).
- Nylon can withstand continuous temperatures up to 150°C; HDPE tops out around 80–90°C.
- Nylon absorbs moisture—that can cause dimensional changes in large parts.
- For a large container, the moisture issue alone might offset the strength benefit.
From the outside, it looks like you just pick the strongest material. The reality is that the strongest material isn't always the best value for the actual use case. Our container lives outdoors in a temperate climate. It doesn't see extreme heat. Moisture absorption could warp a 200-gallon nylon container over time. Toray's specially formulated PE was actually better suited—and about 60% cheaper per unit.
The Moment of Decision
I had about three days to decide before our next batch run started. Normally, I'd run a full TCO spreadsheet across all three vendors. But with the timeline pressure, I went with a gut check based on two things:
- Technical fit. Toray's density-modified PE was clearly the right material for this application.
- Supplier relationship. Sarah had been transparent—she didn't push nylon when it wasn't needed, even though it would have meant a higher-priced order.
I placed the order: 50 large containers from Toray. Total cost: $2,800, plus $320 for shipping. (Should mention: we also ordered a small batch of their ABS compound for another project, just to test their consistency.)
Three months later, the containers are holding up well. No cracks, no warping. We've since ordered another 30 units.
What I Learned—and What It Cost Me to Learn It
In hindsight, here's the real lesson: spec'ing materials isn't a science fair project—it's a cost optimization exercise. Every material choice has trade-offs. Toray's approach worked for us because they matched the product to our conditions, not to a generic application chart.
Here are three takeaways for anyone else sourcing plastics:
1. Don't let the "nylon vs. plastic" debate slow you down
Yes, nylon is a plastic. But in procurement, the question isn't is it technically a plastic?—it's is it the right plastic for my budget and my performance needs? If you're making gear parts that see high stress and heat, nylon might be worth the premium. For large containers that sit in a yard? Probably not.
2. Polyethylene density matters—a lot
When Sarah mentioned polyethylene plastic density, I almost glossed over it. But density is directly linked to crystallinity, stiffness, and impact resistance. HDPE (0.94–0.96 g/cm³) is stiffer and stronger than LDPE (0.91–0.93 g/cm³). For a large container, you want HDPE—but also check if the supplier offers a gap-graded or bimodal grade for better stress crack resistance. Toray's density-modified PE essentially did that without the premium price.
3. Test small before you scale—even if the vendor is reputable
Per FTC guidelines on advertising and claims (ftc.gov), environmental or performance claims should be substantiated. But you also need to verify. We ordered a small batch of Toray's ABS compound alongside the containers—just to run our own tests. It cost about $400 extra, but it confirmed the material matched the spec sheet.
I know some procurement people skip this step to save time. In my experience, a $400 test order can save you a $4,000 mistake. (Actually, I've seen it save a $12,000 mistake once—but that's another story.)
Final Thoughts: The Cost Controller's Bottom Line
Toray isn't always the cheapest option. But for our needs—large containers that balance chemical resistance, impact strength, and cost—they delivered the best TCO. Not because they had the lowest price, but because they had the right material advice and didn't sell me something I didn't need.
To be fair, I've had good experiences with other suppliers too. But Sarah's willingness to explain the polyethylene density trade-off, rather than pushing a higher-margin nylon product, earned our trust. That trust is worth real money in a long-term supplier relationship.
The bottom line: If you're sourcing large plastic containers or any industrial plastic product, don't just compare prices. Compare how well the supplier understands your actual use case. That's where the real savings come from.
Oh, and one last thing: if anyone asks you "is nylon a plastic?"—you can say yes, but make sure they know the follow-up question matters more: "Is it the right plastic for my job?"