What is Nylon? An Engineer’s Guide to Avoiding Costly Failures

A few years ago, we got a frantic call on a Friday afternoon. A small, local food processing plant had a critical conveyor line go down. The culprit? A single, fist-sized gear in the main drive gearbox had sheared three of its teeth. The original gear was a custom part from a German manufacturer with a six-week lead time. Every hour of downtime was costing them thousands of dollars in lost production.

They sent me the broken gear. It was heavy, greasy, and made of cast steel. The maintenance manager was convinced he needed an identical steel replacement. “It has to be strong,” he insisted. “Look what happened to this one.”

I took a look at the wear patterns, the nature of the failure, and asked a few questions about the operating environment. It was a high-speed, low-torque application. The failure wasn’t from a lack of strength; it was from fatigue and likely a lubrication failure. Making a new steel gear would be slow and expensive. I told him, “I can have you a new gear by Monday morning. But it won’t be steel.”

He looked at me like I had three heads.

On Saturday, we took the original gear, modeled it in our CAD system, and then loaded a four-inch diameter rod of black Nylon 6/6 into one of our CNC lathes. By the end of the day, we had a perfect, glossy black plastic replica of his steel gear. When the manager arrived on Monday, he was skeptical. He held it in his hand. “This is plastic,” he said, the disappointment obvious in his voice. “It feels too light.”

“It’s not just plastic,” I corrected him. “It’s nylon. It’s self-lubricating, it’s quieter, and it’s more than tough enough for your application. More importantly, it’s going to absorb shock and vibration in a way that steel gear never could, protecting the rest of your gearbox.”

He reluctantly took the gear. Two years later, that same nylon gear is still running 24/7. The steel gears in the system have been replaced twice. The client is now one of our biggest accounts.

This is the story I tell whenever someone asks me, “What is nylon?” Most people think of stockings, parachutes, or cheap fabric. But for an engineer, nylon isn’t a fabric. It’s a secret weapon. It’s a family of the most versatile, high-performance engineering plastics on the planet, and understanding the difference between them is the key to solving million-dollar problems with what looks like a simple piece of plastic.

The Two Faces of Nylon: From Silky Fiber to Solid Steel Replacement

The core of the confusion around nylon comes from its incredible dual personality. It is both a world-class fiber and a world-class solid material. This isn’t an accident; it’s a direct result of its molecular structure.

At its heart, nylon is a polyamide. The “poly” just means “many,” and the “amide” refers to a specific chemical link that joins smaller molecules (called monomers) into a massive, long chain, like millions of paperclips linked end-to-end. This chain is the polymer.

The magic of nylon is in how these long chains interact with each other. They are strongly attracted to one another through something called hydrogen bonds. Think of it like a microscopic form of Velcro. This powerful intermolecular attraction is what gives nylon its signature properties: strength, toughness, and resilience.

Face #1: Nylon as a Fiber

When you melt nylon and force it through tiny holes (a process called extrusion), you can form incredibly fine, continuous filaments. As these filaments are drawn and stretched, the long polymer chains align themselves in a highly ordered, parallel structure. The “Velcro” effect goes into overdrive, with the chains locking together along their entire length.

This is what creates the nylon fiber we know in textiles. It’s a material that is:

• Exceptionally Strong for its Weight: This is why it was famously used for parachutes and climbing ropes.
• Elastic: It can stretch significantly without breaking and then return to its original shape. This is critical for applications like hosiery and activewear.
• Abrasion Resistant: The tightly bound chains are very difficult to scuff or wear away, which is why nylon is a key component in carpets and luggage.

When we work with clients in the apparel or outdoor gear industry, we’re dealing with this face of nylon. They talk about “denier” (a measure of fiber thickness) and weave patterns. They need materials that are lightweight, flexible, and can withstand being rubbed, stretched, and washed repeatedly. For them, nylon is a high-performance textile.

Face #2: Nylon as a Solid Engineering Plastic

But what happens when you take that same molten nylon and instead of drawing it into a fiber, you inject it under high pressure into a steel mold or cast it into a solid block?

The polymer chains are still there, and the “Velcro” effect is still in play. But instead of being neatly aligned in parallel lines, the chains are jumbled together in a more random, amorphous structure, with regions of crystalline order mixed in. This creates a solid material with a completely different set of engineering properties. This is the nylon that replaced my client’s steel gear.

Solid, or “neat,” nylon is a material that is:

• Incredibly Tough and Impact Resistant: It can absorb a tremendous amount of energy before it fractures. You can hit a block of nylon with a hammer, and it will dent, not shatter. This is why it’s used for protective housings and impact-absorbing components.
• Low-Friction (Low Coefficient of Friction): Nylon surfaces are naturally slippery, especially against metals. This property, known as being “self-lubricating,” is why it is the go-to material for unlubricated bearings, wear pads, and slide plates. The nylon gear didn’t need the constant grease its steel predecessor did.
• High Wear Resistance: Just like the fiber, the solid form is very difficult to wear down. It thrives in high-rubbing applications.
• Good Chemical Resistance: It stands up well to oils, fuels, and most common industrial solvents.

When an automotive engineer specifies a fuel line clip, or a medical device designer creates a new surgical tool handle, they are using this second face of nylon. They talk about tensile strength, heat deflection temperature, and water absorption rates. For them, nylon is a direct competitor to metals like aluminum and steel, and other plastics like Acetal (Delrin) or PEEK.

Understanding this dual nature is the first step. The next, and far more critical step for any engineer or designer, is realizing that “nylon” is not a single material. It’s a family name for a huge range of formulations, each with a different personality and a different job to do. Choosing the right member of the family is the difference between a brilliant success and a costly failure.

The Nylon Family Tree: Why the Numbers (6, 6/6, 12) Are a Million-Dollar Detail

In my early days as a junior engineer, I worked under a grizzled old toolmaker named Frank. He’d been machining steel since before my parents were born, and he had little patience for the new wave of engineering plastics. To him, they were all just “plastic.” One day, I brought him a drawing for a small housing that was going to be injection molded. The material callout on my drawing, which I had proudly created, simply read: “NYLON, BLACK.”

Frank looked at the drawing, then at me over the top of his spectacles. He took a long, slow sip of his coffee. “Nylon, eh?” he grumbled. “Which one? The kind that swells up like a sponge in the rain, or the kind that cracks if you look at it wrong? The cheap stuff, or the expensive stuff?”

I was speechless. I thought nylon was nylon. That day, Frank sat me down and gave me the most important lesson about polymers I ever learned: “Material selection is not a detail; it is the entire design.” Specifying “nylon” is as useless as specifying “metal.” Is it steel? Aluminum? Titanium? Is it an alloy? Has it been heat-treated? The same depth of specificity applies to the world of engineering plastics, and nowhere is this more critical than with the nylon family.

The numbers you see after the name—Nylon 6, Nylon 6/6, Nylon 12—aren’t just marketing terms. They are the chemical fingerprint of the polymer. They tell an engineer everything about its core personality, its strengths, and, most importantly, its fatal flaws.

What the Numbers Actually Mean: A Quick Chemistry Lesson

To understand the difference, you have to picture those long polymer chains we talked about. These chains are made by linking smaller molecules, called monomers, end to end. The numbers in nylon’s name simply refer to the number of carbon atoms in the monomer building blocks.

• Nylon 6: Is made from one type of monomer that has 6 carbon atoms. (This is called caprolactam).
• Nylon 6/6: Is made from two different types of monomers. The first has 6 carbon atoms (hexamethylenediamine), and the second also has 6 carbon atoms (adipic acid). Hence, 6/6.
• Nylon 12: Is made from one type of monomer that has 12 carbon atoms.

Why on earth does this matter? Because the carbon part of the chain is relatively neutral, but the “amide” part of the chain—the link that joins the monomers—is a water magnet. It’s “hydrophilic.” In a nylon chain, you have long sections of carbon atoms punctuated by these water-loving amide links.

• In Nylon 6 and 6/6, you have a high concentration of amide links relative to the number of carbon atoms.
• In Nylon 12, with its long 12-carbon monomer, the amide links are spaced much farther apart. There is a much lower concentration of water-loving groups.

This single chemical difference is the source of the most dramatic variations in performance between the types of nylon. It dictates which nylon is right for a structural bracket in a hot, dry engine bay and which one is right for a fuel line clip that will be constantly exposed to moisture and chemicals.

Head-to-Head Showdown: The Main Branches of the Nylon Family

Let’s put the big three on the table and see how their chemical differences translate into real-world engineering decisions.

Case Study: The “Swelling Clips” and the Cost of Ignoring Water

This isn’t theoretical. Several years ago, a promising startup came to us to manufacture a series of intricate snap-fit clips for an electronic enclosure they were developing. The device was intended for both indoor and outdoor use. Their design was brilliant, with very fine, precise locking features.

Their engineering team was young and sharp. They knew they needed a tough material, so they specified “Nylon” on their drawings. During our initial quoting process, we pressed for more detail. To keep costs down for the initial production run, they chose Nylon 6/6. It was strong, stiff, and relatively inexpensive.

We built the injection mold, and the first parts came out looking like jewels. They were glossy black, and the snap features worked with a satisfying, crisp click. The client was thrilled. They approved the parts, and we ran the first 10,000 units, which they immediately shipped to their customers all over the country.

Six weeks later, the panicked calls started. A large batch of their devices deployed in Florida had failed. The enclosures were popping open. The clips, they reported, no longer “clicked”; they felt mushy and wouldn’t hold.

I knew the cause before the sample parts even arrived back at my factory. Florida in the summer is a swamp. The relative humidity is consistently above 80%. The beautiful, stiff Nylon 6/6 clips had done exactly what chemistry dictated they would do: they had absorbed moisture from the air.

When we measured the returned clips, they had swelled by nearly 1.5% in their critical dimensions. The fine, crisp locking edges had become rounded and soft. The material itself had lost over 30% of its stiffness. The brilliant design was completely undermined by the wrong material choice.

The fix was painful. We had to re-run the entire order using Nylon 12. The material cost per part was nearly double, but its low moisture absorption meant the parts would be dimensionally stable whether they were in the Arizona desert or the Florida Everglades. The “savings” they achieved by choosing Nylon 6/6 were vaporized in a single product recall. It was Frank’s lesson all over again, written in the language of lost revenue and angry customers.

The Game Changer: How Reinforcements Turn Nylon into a Metal Killer

The story doesn’t end with the “neat” or pure nylons. The true magic, and the reason nylon has replaced metal in so many demanding applications, comes from adding reinforcements. When you see a material specified as “Nylon 6/6, 30% GF”, it means it’s a composite.

GF stands for Glass Filled. During the compounding process, tiny, chopped strands of fiberglass (typically less than a millimeter long) are mixed directly into the molten nylon.

CF stands for Carbon Filled, which involves using even stronger, stiffer (and more expensive) carbon fibers.

Think of it like adding steel rebar to concrete. The nylon polymer is the matrix, and the fibers are the reinforcement. This creates a material that is far more than the sum of its parts.

What Does Adding Glass Do?

1. Dramatically Increases Stiffness and Strength: A 30% glass-filled Nylon 6/6 can have a tensile strength and flexural modulus (a measure of stiffness) that rivals cast aluminum, but at half the weight.
2. Boosts Heat Resistance: The glass fibers act as a scaffold, helping the part hold its shape at much higher temperatures. The “Heat Deflection Temperature” can jump by over 100°C.
3. Improves Dimensional Stability: It significantly reduces the rate of thermal expansion and helps control shrinkage during molding.

This is the material you’ll find in modern automotive engine covers, intake manifolds, and power tool housings. These are parts that need to be strong, stiff, lightweight, and survive in a brutal environment of heat, vibration, and chemical exposure. Twenty years ago, they would have all been made from die-cast aluminum. Today, glass-filled nylon reigns supreme.

But there is no free lunch in engineering. The trade-off is a significant reduction in impact strength. The composite material is stiffer, but it’s also more brittle. An un-filled nylon part might dent when struck; a glass-filled part is more likely to crack. The design of the part must account for this change in personality.

We’ve now explored the members of the nylon family and their super-powered composite cousins. We understand the critical properties that drive the selection process. But how do we take these raw materials and turn them into a finished, functional part?

From Pellet to Part: How Nylon Becomes a Physical Reality

We’ve dissected the nylon family, pitting the workhorse Nylon 6/6 against the stable Nylon 12. We’ve seen how reinforcements like glass fiber can transform this humble polymer into a material that challenges aluminum. But a pile of raw material, no matter how advanced, is commercially useless. The final, critical piece of the puzzle is transforming those pellets, powders, or filaments into a finished part that meets a specific engineering need.

Choosing the right manufacturing process is just as critical as choosing the right material. The most perfectly selected, glass-filled, heat-stabilized nylon will fail if it’s molded into a poorly designed part. The process and the design are inextricably linked. At my factory, we see this every day. A brilliant design intended for 3D printing will be impossible to injection mold. A part designed for the forgiving nature of cast aluminum will warp into a pretzel when molded from glass-filled nylon.

Understanding how nylon behaves during manufacturing is the final gateway to success. Let’s walk through the two most important methods for bringing a nylon part to life.

Injection Molding: The King of High-Volume Production

For any product needed in quantities of a few thousand to many millions, injection molding is the undisputed king. The process, in principle, is simple:

1. Drying: Nylon pellets are placed in a special hopper that heats them and circulates hot, dry air to remove absorbed moisture. This is the most critical and non-negotiable step.
2. Melting: The dried pellets are fed into a heated barrel containing a large rotating screw. The screw conveys the pellets forward, and the combination of heat from the barrel and shear from the screw’s rotation melts them into a homogenous, molten plastic.
3. Injecting: Once a sufficient “shot” of molten plastic is ready, the screw thrusts forward like a plunger, injecting the material at extremely high pressure (often 10,000 to 20,000 PSI) into a precision-machined steel mold.
4. Cooling & Ejecting: Water circulates through channels in the mold to cool the plastic rapidly. Once it has solidified, the mold opens, and ejector pins push the finished part out. The entire cycle can take anywhere from 15 seconds to a couple of minutes.

Nylon, especially Nylon 6 and 6/6, is a fantastic material for molding. It has low viscosity when molten, meaning it flows easily into thin walls and complex features. But it brings two major challenges that every good part designer must account for.

• Moisture Control is Everything: If you try to mold nylon pellets that haven’t been properly dried, the water trapped inside them will instantly flash to steam in the hot barrel. This steam gets injected into the part, creating cosmetic defects like “splay” (silvery streaks) on the surface and, more dangerously, introducing bubbles that create internal weak points. The part will be brittle and will not meet its specified strength. At RM, our nylon drying hoppers run 24/7. We have strict protocols for bake times and moisture analysis, because we know that skipping this step is a recipe for a full-scale production failure.
• Warpage from Shrinkage: Nylon is a semi-crystalline polymer. As it cools in the mold from a molten, amorphous state, its molecular chains organize themselves into dense, tightly packed crystalline structures. This alignment causes the material to shrink significantly more than a purely amorphous plastic. If a part has thick sections next to thin sections, the thick sections will cool slower and shrink more, creating immense internal stress that can warp the part as soon as it’s ejected from the mold.

Additive Manufacturing (3D Printing): The Revolution in Speed and Complexity

While injection molding rules mass production, 3D printing has completely changed the game for prototyping, custom tooling, and low-volume production. Two technologies are dominant for nylon.

Selective Laser Sintering (SLS): This is the workhorse of professional 3D printing. The machine uses a bed of fine nylon powder (almost always a variation of Nylon 12 or Nylon 11 due to their thermal stability). A roller spreads a paper-thin layer of powder across the build platform. A powerful CO2 laser then selectively sinters—heats and fuses—the powder particles together, tracing the cross-section of the part. The platform then lowers, another layer of powder is spread, and the process repeats.

The magic of SLS is that the unsintered powder supports the part as it’s being built. This means you don’t need dedicated support structures, allowing for the creation of incredibly complex, interlocking geometries that would be impossible to injection mold. The finished parts are strong, functional, and have a slightly rough, matte surface finish. SLS with nylon is our go-to process at RM for functional prototypes, jigs, fixtures, and even end-use parts in aerospace and medical applications.

Fused Deposition Modeling (FDM/FFF): This is the most common and accessible form of 3D printing, where a filament of plastic is fed into a hot nozzle and extruded layer by layer. While early desktop printers struggled with nylon, modern industrial FDM machines and advanced materials have made it a viable option.

Printing with nylon filament presents its own challenges, all stemming from its core properties. It still absorbs moisture, so the filament must be stored in a dry box right up until the moment it enters the printer. It’s prone to warping as it cools, requiring a heated chamber and excellent bed adhesion. The real game-changer here has been the development of glass-filled and carbon-fiber-filled nylon filaments. These materials allow us to print incredibly stiff, strong, and lightweight parts—like custom robot end-effectors or drone components—that are far stronger than standard plastics like ABS or PLA.

Clive’s Checklist: Designing Nylon Parts That Don’t Fail

A material is only as good as the design it’s used in. Over 25 years, I’ve seen countless projects fail not because nylon was the wrong choice, but because the part wasn’t designed for nylon. Here are the five rules I drill into every young engineer who works with me.

Rule #1: Master the Wall Thickness

The single biggest cause of warpage, sink marks, and cosmetic defects in injection-molded nylon parts is non-uniform wall thickness. A designer creates a housing that is 2mm thick in most places but incorporates a solid, 10mm thick boss for a screw. The 2mm wall cools and solidifies in seconds. The 10mm boss stays molten in the center for much longer. As that thick section continues to cool and shrink, it pulls on the already-solid thin walls around it, causing the part to warp and a visible “sink mark” to appear on the surface opposite the boss.

Your Action: Design your part with a consistent, uniform wall thickness whenever possible. If you need a thicker section for a boss or a rib, use multiple thin ribs to create the strength instead of one solid chunk of plastic. Make transitions from thin to thick sections gradual and smooth, not abrupt.

Rule #2: Respect the Radii

Sharp internal corners are the enemy of good plastic part design. A sharp corner is a point of concentrated stress. For a tough, ductile material like unfilled nylon, it might survive. For a stiff but brittle material like glass-filled nylon, a sharp internal corner is a pre-made crack initiation point. When the part is subjected to vibration, impact, or thermal cycling, that corner is where the failure will begin.

Your Action: Add a generous radius to all internal corners. A good rule of thumb is that the internal radius should be at least 0.5 times the nominal wall thickness. This simple change distributes the stress over a wider area, dramatically increasing the part’s fatigue life and impact strength.

Rule #3: Design for Moisture (The Million-Dollar Rule)

This rule is so important it’s worth repeating. You must assume that if you are using Nylon 6 or 6/6, your part will change size in service. The “Swelling Clips” case study from before is a perfect example.

Your Action: If your part has tight-tolerance features, moving components, or snap-fits that must function in a variable-humidity environment, you have two choices.

1. Choose the right material: Default to Nylon 12 or another low-moisture-absorption polymer.
2. Design around the change: If you must use Nylon 6/6 (for cost or strength reasons), perform the calculations. Know how much the part will swell and design generous clearances into your assembly to accommodate the change. Never design a press-fit or a tight-tolerance slip-fit with Nylon 6/6 for an outdoor application.

Rule #4: Account for Anisotropy in Reinforced Nylons

This is a more advanced concept, but it’s where professional engineers separate themselves from amateurs. Anisotropy means a material has different properties in different directions. Wood is a perfect example; it’s very strong along the grain but splits easily across it.

The same thing happens in an injection-molded, glass-filled nylon part. As the molten plastic flows into the mold cavity, the long, thin glass fibers tend to align themselves in the direction of flow. This means the finished part will be significantly stronger and stiffer along the direction of flow than it is across it. I’ve seen brackets that were brilliantly strong in one direction snap with very little force in the other because the designer didn’t consider how the plastic would flow into the mold.

Your Action: When designing a structural part with GF/CF nylon, you must think about how the mold will be filled. Work with your manufacturer. Indicate on your drawing the critical load direction. This allows the toolmaker to position the injection gate in a way that maximizes fiber alignment along that critical axis, giving you strength exactly where you need it most.

Rule #5: The Gate is Part of the Design

The “gate” is the small opening where the molten plastic enters the mold cavity. Its location is a critical decision that affects everything: fiber orientation (as we just discussed), weld lines (where two flow fronts meet), and cosmetics. A gate on a visible surface leaves a blemish that might be unacceptable.

Case Study: The Streaky Housing: We once worked with a client on a consumer electronics housing made from a beautiful, pearlescent-white Nylon 6. Their industrial design was flawless. They insisted that the gate be placed on a non-visible internal feature to preserve the pristine outer surface. The problem was that this gate location forced the molten plastic to flow a very long, circuitous path around the part. This created multiple weld lines and flow marks on the A-surface, which looked like faint, ugly streaks. The “perfect” surface they wanted was ruined. The solution was to switch to a “hot tip” gate, a more expensive tooling option that allowed us to place a tiny, clean gate right in the center of the part’s B-surface, resulting in a radial flow pattern and a flawless cosmetic finish.

Your Action: Don’t treat the gate location as an afterthought. Discuss it with your manufacturer during the design phase. A good manufacturer will perform a mold flow simulation to predict how the part will fill and help you choose a gate location that balances structural integrity, cosmetic appearance, and tool cost.

The Final Verdict: Why Nylon Endures

From the delicate bristles of a toothbrush to the high-load gears in an industrial gearbox, nylon’s versatility is staggering. It’s not a single material, but a vast and adaptable family of polymers. Its commercial success over the last 80 years isn’t an accident. It comes from an unparalleled balance of properties: toughness, heat and chemical resistance, low friction, and excellent manufacturability.

But its power is also its peril. Treating “nylon” as a generic commodity is the fast track to a costly failure. Success requires a holistic approach. It demands that you select the right member of the family for the environment, respect its relationship with moisture, and design a part that is optimized for the specific manufacturing process you intend to use. When you get all three of those things right, there are few materials in the world that can deliver the same performance for the price.

Frequently Asked Questions (FAQ)

Is nylon a type of plastic?

Yes, absolutely. Nylon is a major family of synthetic polymers known as polyamides. It falls under the category of engineering thermoplastics, meaning it can be melted and reformed repeatedly, which is why it’s ideal for processes like injection molding.

Is nylon waterproof?

No, and this is a critical distinction. Nylon is not waterproof; it is hygroscopic, which means it actively absorbs water from the environment. This absorption causes it to swell and changes its mechanical properties, making it softer and more flexible. Materials that are truly waterproof, like polypropylene, do not absorb moisture.

Can you machine nylon?

Yes, nylon is an excellent material for machining. It is often sold in stock shapes like rods and plates, especially cast Nylon 6, which is produced in large, stress-free blocks. It cuts cleanly, holds a good surface finish, and its self-lubricating properties make it easy on cutting tools. We often machine nylon prototypes or low-quantity parts at RM before committing to an expensive injection mold.

Is nylon stronger than polyester?

This depends heavily on the form and application. In terms of fibers for textiles, their strengths are comparable, with nylon often having a slight edge in abrasion resistance and elasticity. In the world of engineering plastics for solid parts, engineering-grade nylons (especially glass-filled variants) generally have far superior mechanical properties—strength, stiffness, and temperature resistance—than common polyester resins like PET.

How do you glue nylon?

Gluing nylon is notoriously difficult. Its chemical resistance and low surface energy mean that most common adhesives, like epoxies or superglues, will not form a strong bond. To successfully glue nylon, you typically need a multi-step process involving surface preparation (such as flame or plasma treatment to oxidize the surface) followed by the use of specialized primers and structural adhesives like two-part polyurethanes or specialized cyanoacrylates.

References & Further Reading

• DuPont™ Zytel® PA Polyamide Resins: https://www.dupont.com/brands/zytel.html (A deep dive into one of the original and most respected brands of nylon, with extensive technical data sheets and application guides.)
• BASF Polyamides (Ultramid®): https://plastics-rubber.basf.com/global/en/performance_polymers/products/ultramid.html (Another leading global manufacturer offering a vast portfolio of PA6, PA66, and other specialty nylons with detailed engineering data.)
• Plastics Technology – “Drying Basics for Nylon Resins”: https://www.ptonline.com/articles/drying-basics-for-nylon-resins (An excellent technical article from an industry publication explaining the critical importance of drying nylon before processing.)

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