Nylon is a versatile synthetic material used in a wide range of applications from fabrics and clothing to machine parts and components. However, nylon can be tricky to bond and repair due to its slick surface and low surface energy. Choosing the right adhesive is crucial for creating a strong, long-lasting bond with nylon.
Nylon and Its Bonding Challenges
Nylon, or polyamide, was the first commercially successful synthetic polymer ever created. This versatile plastic polymer is formed through a process called polymerization where the monomers are linked together to form long molecular chains known as polymers.
Some key properties of nylon include:
- High strength and durability
- Resistance to abrasion, chemicals, oils, greases
- Low friction surface
- Resilience and flexibility even at low temperatures
- Resistance to mold, mildew, and rotting
- Low moisture absorption
These exceptional properties make nylon a popular choice for mechanical parts, sporting goods, fabrics, ropes, and countless household items and consumer products. However, the same properties that make nylon so useful can also make it difficult to join and bond using adhesives.
The slick surface and low surface energy of nylon mean most glues have a hard time gaining purchase on the material. Nylon is also prone to flexing and expanding/contracting with temperature changes, which can stress and weaken bonded joints over time. Successfully gluing nylon requires selecting an adhesive that can overcome these challenges.
Factors to Consider When Choosing a Nylon Adhesive
With so many adhesive types available, from epoxies and urethanes to cyanoacrylates and plastic cements, how do you know which is the best choice for nylon? Here are the key factors to keep in mind:
Bond Strength and Durability
The adhesive must be strong enough to create a permanent, rigid bond with the nylon. It should maintain strength even as nylon expands and contracts slightly during temperature changes. Durability over the long term is essential.
Flexibility
The adhesive should remain somewhat flexible after curing to withstand the bending and flexing motions of nylon. Rigid, brittle adhesives are more likely to crack under stress.
Chemical and Moisture Resistance
Nylon is used in many outdoor, marine, and industrial applications where chemical or moisture exposure is likely. Select an adhesive that maintains strong adhesion even under these conditions.
Temperature Resistance
The adhesive must tolerate temperature extremes that cause nylon to expand and contract without compromising the bond strength.
Cure Time and Workability
Faster curing adhesives allow for quicker repairs and fabrication. However, slower-curing adhesives provide more working time for adjustments and complex bonding jobs. Consider the scale of your project when assessing cure time.
By keeping these factors in mind, you can narrow down which adhesive types are best suited for nylon applications. The following sections provide an overview of the top nylon adhesives.
Cyanoacrylate Adhesives
Cyanoacrylate, better known as “super glue”, is a top choice for quickly and firmly bonding nylon pieces. This adhesive works by rapidly polymerizing and solidifying when pressed into a thin layer between close-fitting surfaces 18.
Some advantages of cyanoacrylate for nylon include:
- Extremely fast cure time – bonds in seconds 10
- Strong initial tack and holding power
- Simple, one-part application
- Relatively low cost and wide availability
- Bonds well with close-fitting, smooth surfaces
Original super glues were known for brittleness and instability with heat, moisture, and solvents. However, modern formulations are vastly improved in these areas, with brands like Loctite offering industrial-grade super glues designed for plastics 10. With proper gapping and surface prep, cyanoacrylate is suitable for most small-scale nylon bonding, crafting, and repair applications.
For larger projects or more demanding environments, the limitations of super glue may require a more heavy-duty adhesive option.
Epoxy Adhesives
Epoxy is arguably the most versatile and durable adhesive available for nylon applications, both industrial and consumer. Epoxies form exceptionally strong, rigid bonds between materials, offering superior adhesion to nylon along with chemical and environmental resistance 6.
The components of an epoxy include:
- Resin – Provides chemical and moisture resistance
- Hardener – Controls properties like strength and cure time
- Filler – Enhances properties like bond gap filling and heat resistance
Common advantages of epoxy adhesives include:
- Extremely strong and rigid cured bond
- Resilience against temperature extremes, moisture, and chemicals
- Bonds dissimilar materials like plastics, metals, glass, wood, etc.
- Gap filling abilities
- Range of cure times from 5 minutes to 24 hours
For nylon specifically, two-part epoxy adhesives designed for plastics offer the best results 2. These epoxies contain formulations optimized for getting the resin to penetrate and mechanically adhere to smooth plastic surfaces like nylon. Brands like J-B Weld Plastic Bonder have proven nylon bonding strength along with resistance to water and extremes up to 300°F 2 3.
The only downsides to epoxy are longer cure times, mixing of two-part formulas, and lower flexibility compared to other adhesives. However, for critical structural bonds, epoxy cannot be surpassed.
Polyurethane Glue
Polyurethane glue, commonly sold under brands like Gorilla Glue, offers several advantages for bonding nylon 7:
- Strong adhesive power
- Maintains some flexibility after curing
- Bonds diverse materials including plastic, wood, metal, glass
- Resistant to outdoor/moisture exposure
- Gap filling – works on uneven or mismatched surfaces
Polyurethane glue expands slightly as it cures, allowing it to penetrate into surfaces for enhanced grip. The cured adhesive is also somewhat rubbery and elastic, making it ideal for applications where the nylon will flex and bend 7. This prevents cracked or compromised joints, an issue with more rigid epoxies.
For versatile bonds with nylon fabrics, plastic components, or multi-material assemblies, polyurethane glues like Gorilla Glue are an excellent solution. They are widely available and easy to apply from their identifying squeeze bottles. Just be mindful that the foaming expansion requires clamping parts tightly together as the glue cures.
Plastic Welding Adhesives
Plastic welding adhesives, also called plastic solvent cements or plastic epoxy, provide a specialized bonding solution for nylon and other plastic polymers. These adhesives work by partially dissolving the surface of the nylon pieces, allowing polymer chain intermingling as the solvent evaporates 4.
Some key traits of plastic welding adhesives:
- Designed specifically for plastic bonding applications
- Offer very strong, permanent plastic bonds
- Quick setting time
- Easy application from squeeze-tube dispensing
- Low cost
Popular brands like Plasti-Zap and Ambroid ProWeld offer plastic welding adhesives formulated for nylon and other thermoplastics 4. Because the solvents soften the plastic surfaces, proper ventilation is critical during application and curing. Plastic welding adhesives are best suited for bonding nylon components, fabricating plastic assemblies, and similar applications.
E6000 Craft Adhesive
E6000 is a versatile craft adhesive gaining popularity for bonding tricky materials like nylon 10. It is 100% waterproof yet remains flexible when cured. This makes it ideal for applications where the nylon will encounter moisture or changes in temperature that cause expansion and contraction.
Key benefits of E6000 for nylon projects:
- Bonds nylon strongly to diverse materials
- Withstands vibration, shock, and flexing movements
- Resistant to water, chemicals, and UV light
- Can be used indoors or outdoors
- Paintable if needed for aesthetics
E6000 works well for adhering nylon outdoor gear and sporting equipment, nylon webbing and tie-downs, and crafts/repairs using nylon fabrics. It cures fairly slowly, allowing time to align parts and create a permanent bond that won’t crack or weaken. For versatile nylon bonding scenarios, E6000 is a great adhesive to have on hand.
Choosing the Best Nylon Adhesive By Project
Now that we’ve covered the top adhesives for nylon materials, here is a summary of recommended products based on different project types and applications:
For Nylon Fabrics and Flexible Components
- E6000 – Flexible, waterproof, bonds well to diverse materials
- Gorilla Glue (Polyurethane) – Expands to penetrate fabric, remains flexible
- Loctite Super Glue – Fast drying, versatile for small fabric repairs
For Rigid Nylon Plastic Parts and Assemblies
- JB Weld Plastic Bonder (Epoxy) – Superior strength and heat resistance
- Plasti-Zap (Plastic Welding) – Designed for plastic bonding and fabrication
- Loctite Epoxy – Versatile and durable for components and repairs
For Outdoor Nylon Gear and Equipment
- E6000 – Withstands weathering, water, and flexing movements
- Gorilla Glue (Polyurethane) – Resistant to moisture and temperature fluctuations
For Nylon 3D Printing Applications
- Loctite Super Glue – Fast-curing, gap-filling for bonding 3D printed nylon parts
- JB Weld Plastic Bonder (Epoxy) – High strength and heat resistance for printed components
For Underwater or Chemical/Solvent Exposure
- JB Weld Plastic Bonder (Epoxy) – Impervious to most chemicals and moisture
- Loctite Epoxy – Contains formulations suitable for wet environments
By selecting the optimal adhesive for each unique application, you can achieve strong, long-lasting bonds with nylon materials that hold up to real-world conditions.
Surface Prep Tips for Bonding Nylon
Proper surface preparation is vital for maximizing adhesion and bond strength with nylon substrates. Here are some best practices:
- Clean surfaces with isopropyl alcohol to remove any oils, grease, or contaminants
- Lightly abrade surfaces using fine grit sandpaper to improve adhesive penetration
- Apply adhesive primer if recommended by the manufacturer
- Clamp, pin, or tape parts together to prevent joint movement as adhesive cures
These simple steps help the adhesive grip onto the ultra-smooth nylon surface and create a robust bond. Be sure to follow all preparation guidelines provided with your selected adhesive product.
Correct Application Techniques for Nylon Adhesives
Applying adhesive properly ensures optimal bonding results with nylon:
- Carefully follow all mix and application instructions for multi-part epoxies
- Spread a thin, even layer of adhesive on each surface for maximum strength
- Nylon is prone to flexing – avoid applying too much glue in globs that may crack
- Assemble joints tightly together once adhesive is applied
- Add fillets to distribute stress evenly across bonded seams
- Allow adequate curing time – do not disturb bonded parts prematurely
Again, refer to your adhesive’s guidelines for specific application directions. Proper adhesive selection, surface prep, and application technique will result in durable, high-strength bonds with nylon.
Frequently Asked Questions About Bonding Nylon
What kind of glue is best for nylon?
For most applications, epoxy adhesives like J-B Weld provide the strongest, most durable bond with nylon. Polyurethane glues and plastic welding adhesives also create robust nylon bonds. Cyanoacrylate (super glue) works for quick repairs.
How is nylon bonded?
Nylon can be bonded using adhesives or via welding/fusing processes. Adhesives like epoxy penetrate into micro-crevices on the nylon surface to grip. Some adhesives like plastic cement work by partially dissolving the nylon. Welding literally melts and fuses nylon pieces together.
Can you use super glue on nylon?
Yes, cyanoacrylate super glues provide reasonably strong adhesion to nylon plastics and fabrics. For best results, ensure the nylon surface is clean and free of oils. Allow the recommended curing time.
What is the strongest glue for plastic?
Epoxy adhesives generally offer the strongest, most rigid bonds for joining plastics like nylon. Plastic welding adhesives and polyurethane glues also create durable plastic bonds. Always use adhesives formulated specifically for plastics.
Can you glue nylon without primer?
For less demanding applications, many major adhesives will bond nylon without primer. However, primer greatly improves surface penetration and adhesion. Primer is recommended for bonding nylon parts that will undergo heavy stress and loading.
Conclusion
Bonding nylon can be made easy and effective by selecting the right adhesive and following proper application techniques. Epoxy, polyurethane, and plastic welding adhesives are smart options for durable nylon bonds. For small-scale repairs and crafts, cyanoacrylate super glues also perform well. Prep surfaces properly and apply adhesive according to directions.