Is Nylon Waterproof?

Nylon, a synthetic polymer known for its significant role in the textile and outdoor gear industries, boasts a range of beneficial properties, but its interaction with water is particularly crucial for users. This article dives deep into the question of whether nylon is waterproof, exploring its water-resistant qualities and how they impact its practical applications. From outdoor apparel and camping equipment to umbrellas and swimwear, understanding nylon’s response to moisture is essential for maximizing its use in environments where exposure to water is common. We will examine the science behind nylon’s manufacturing process, its inherent properties related to water resistance, and how various treatments enhance its ability to repel water, providing a comprehensive overview that clarifies this common query.

nylon rope

What Is Nylon?

Nylon is a synthetic thermoplastic polymer that stands out in the world of polymers for its strength, elasticity, and resistance to abrasion and chemicals. First developed in the 1930s by DuPont scientists, nylon was initially introduced as a synthetic alternative to silk, famously used in women’s stockings. Over the decades, its applications have expanded significantly, encompassing a broad range of industries and products. This section delves into the chemical composition, properties, and diverse applications of nylon, shedding light on its significant role in modern materials technology.

Chemical Composition and Manufacture

    • Polyamide Composition: Nylon is a type of polyamide, made from condensing diamines with dicarboxylic acids. This chemical reaction forms long polymer chains, which are the basis of nylon’s durable and flexible characteristics.
    • Production Process: The production of nylon typically involves the process of melt-spinning, where the polymer is melted into a liquid form, extruded through a spinneret, and then cooled to form fibers. This process allows for the creation of both fibers and shapes, making nylon incredibly versatile.

Key Properties

    • Durability: Nylon is renowned for its high tensile strength, allowing it to withstand significant stress without tearing or breaking. This makes it ideal for products that require durability, such as ropes, conveyor belts, and fishing lines.
    • Elasticity and Flexibility: Despite its strength, nylon remains highly elastic and flexible, which is crucial for applications in clothing, especially where comfort and fit are important, such as in hosiery and sportswear.
    • Resistance to Abrasion and Chemicals: Nylon’s molecular structure makes it resistant to abrasion and many chemicals, enhancing its suitability for outdoor and industrial applications where materials are exposed to harsh conditions.

Applications Across Industries

    • Textiles and Fashion: Nylon fibers are extensively used in the production of garments, where they are valued for their ability to stretch, their softness, and their quick-drying properties.
    • Automotive and Aerospace: In more technical fields, nylon is used in the automotive and aerospace industries for components that require a high strength-to-weight ratio and good heat resistance.
    • Consumer Goods: Beyond textiles, nylon finds applications in everyday consumer goods such as toothbrush bristles, kitchen utensils, and carpet fibers.

Understanding the nature of nylon helps in appreciating its widespread use and the various enhancements it brings to products across multiple sectors. Its synthetic origin and adaptable properties make it a cornerstone material in numerous applications, continually expanding as new formulations and composites are developed.

Nylon’s Composition

Nylon’s unique chemical structure is what endows it with its versatile and durable properties, making it a staple in numerous industries. As a synthetic polymer, understanding the specifics of its composition provides insight into why it behaves as it does under various conditions and why it has been engineered to meet diverse applications. This section breaks down the molecular composition of nylon, explaining how its structure contributes to its remarkable characteristics.

Polyamide Family

    • Polymer Structure: Nylon belongs to the family of polymers called polyamides, which are characterized by amide bonds (–CONH–) in the backbone of their molecular structure. These bonds are formed through a condensation reaction between a diacid and a diamine, which results in a repeating unit with amide linkages.
    • Varieties of Nylon: There are several types of nylon, categorized based on the specific acids and amines used in their production. For example, nylon 6,6, one of the most common forms, is synthesized from hexamethylenediamine and adipic acid, which gives it a particularly high melting point and excellent wear resistance.

Thermal Properties

    • Melting Point: Nylons generally have high melting points compared to other polymers, making them suitable for applications that involve high-temperature processes. The exact melting point can vary depending on the type of nylon and its processing.
    • Thermal Stability: Nylon’s thermal stability makes it ideal for use in environments where materials must resist degradation due to heat, such as in automotive engine compartments or industrial machinery.

Physical Properties

    • Durability and Strength: The strength of nylon is largely due to its hydrogen bonding within the polymer chains. Each nylon unit contains polar amide groups, allowing for strong intermolecular hydrogen bonds that significantly enhance its mechanical strength and elasticity.
    • Hydrophobic Nature: Despite its ability to absorb small amounts of moisture, nylon remains predominantly hydrophobic, which contributes to its quick-drying properties and makes it a preferred material for outdoor and marine applications.

Chemical Resistance

    • Resistance to Oils and Chemicals: Nylon is inherently resistant to oils, greases, and many chemicals, making it highly effective in industrial applications where chemical exposure is prevalent. It is less resistant to strong acids and oxidizing agents, which can degrade the polymer chains over time.
    • Adaptability to Additives: The basic nylon structure can be modified with additives to enhance certain properties, such as UV resistance or flame retardancy, further expanding its range of applications.

Understanding the detailed composition of nylon illuminates why it is such a powerful material across so many different fields. From its resistance to wear and chemicals to its thermal stability and strong yet flexible nature, nylon’s molecular makeup is the key to its widespread utility and effectiveness.

Is Nylon Waterproof?

Nylon’s interaction with water is a key factor in its widespread use, particularly in applications where moisture resistance is critical. While nylon is not inherently waterproof, its characteristics make it highly water-resistant, which can be further enhanced through various treatments. This section explores how nylon behaves when exposed to water and the implications for its use in various settings.

Water Resistance

    • Moisture Absorption: Nylon is hygroscopic, meaning it has the ability to absorb a small percentage of water from the surrounding environment. However, the amount absorbed is relatively minimal, which does not significantly affect its structural integrity or strength under most conditions.
    • Effect on Properties: While the absorption of moisture can lead to a slight increase in flexibility and a reduction in tensile strength, nylon still retains much of its durability and toughness when wet. This makes it suitable for many outdoor and marine applications where occasional wetness is inevitable.

Not Fully Waterproof

    • Permeability to Water: By nature, nylon fibers are not completely waterproof; they allow water to penetrate through the material on a microscopic level. This characteristic means that without additional treatments, nylon fabrics and ropes are not fully watertight.
    • Implications for Use: In scenarios where complete water impermeability is required, such as in rainwear or waterproof bags, nylon must undergo specific treatments to enhance its water resistance.

Enhancing Water Resistance

    • Coatings and Treatments: To make nylon waterproof, it is often treated with coatings or finishes that block the pores in the fabric or fibers, preventing water from passing through. Common treatments include silicone coatings, polyurethane layers, or a laminating process with other waterproof materials.
    • Applications of Treated Nylon: Treated nylon is extensively used in the manufacture of outdoor gear such as waterproof backpacks, rain jackets, and tents. These applications benefit from nylon’s enhanced water resistance while maintaining the material’s inherent strengths such as durability and flexibility.

Considerations for Maintenance

    • Care and Durability: Waterproofed nylon products require proper care to maintain their water-resistant properties. Frequent washing or exposure to harsh chemicals can degrade waterproof coatings over time, necessitating periodic reapplication of the treatments.
    • Longevity of Water Resistance: The longevity of nylon’s water resistance depends on the quality of the waterproofing treatment and the conditions under which the material is used. Regular assessments and appropriate maintenance can extend the effective life of waterproofed nylon items.

Understanding nylon’s capabilities and limitations with respect to water resistance is crucial for selecting the right type of nylon for specific needs, especially in environments where exposure to moisture is a frequent concern. Enhanced through technological treatments, nylon can meet the demands of even the most challenging moisture-related applications, making it a versatile and practical choice in both everyday and specialized contexts.

nylon rope

Can You Make Nylon Waterproof?

While nylon inherently possesses water-resistant properties, making it fully waterproof involves additional treatments and processes. These enhancements are crucial for applications where nylon must completely repel water rather than just resist its penetration. This section explores the techniques and technologies used to elevate nylon’s water resistance to waterproof status, ensuring its suitability for a wide range of uses where moisture exclusion is critical.

Waterproof Coatings

    • Application of Coatings: One of the most common methods to make nylon waterproof is by applying a coating of synthetic materials such as silicone, acrylic, or polyurethane. These coatings cover the surface of the nylon fabric, filling the gaps in the fibers and creating a barrier that repels water.
    • Effectiveness and Durability: Coatings not only prevent water from penetrating the nylon but also maintain the material’s breathability, which is important for clothing and outdoor gear. The durability of these coatings depends on the environmental conditions and the frequency of use, with regular reapplication needed to maintain effectiveness.

Laminating with Waterproof Membranes

    • Lamination Process: Another technique to waterproof nylon involves laminating the fabric with waterproof membranes, such as Gore-Tex or TPU (thermoplastic polyurethane). This process bonds a thin, waterproof layer to the nylon, enhancing its water resistance while allowing vapor to escape, thus preserving the fabric’s breathability.
    • Applications: Laminated nylon is extensively used in high-performance outdoor apparel and equipment, where full waterproofing is necessary without sacrificing comfort or flexibility.

DWR (Durable Water Repellant) Treatments

    • Applying DWR Treatments: DWR treatments involve applying a chemical finish to the outer surface of the nylon that causes water to bead up and roll off rather than soak through. This treatment is often used in conjunction with other waterproofing methods to enhance the overall effectiveness.
    • Maintenance and Reapplication: DWR coatings can wear off over time, especially with frequent washing or exposure to dirt and oils. Regular reapplication of the DWR treatment is necessary to sustain the waterproof properties.

Considerations for Choosing Waterproofing Methods

    • Intended Use: The choice of waterproofing method often depends on how the nylon will be used. For items that require more robust protection and durability, such as outdoor tents or heavy-duty rain gear, laminating or heavy coatings might be preferable.
    • Cost and Environmental Impact: The cost of waterproofing treatments can vary, and some methods have greater environmental impacts than others. Considerations such as the sustainability of the waterproofing agents and the lifecycle of the product should be taken into account.

By implementing these waterproofing techniques, nylon can be effectively transformed from a water-resistant to a waterproof material, expanding its utility across numerous applications where exposure to water is a regular concern. Whether for consumer goods like raincoats and waterproof bags, or in industrial applications such as tarps and covers, waterproofed nylon offers a reliable and durable solution.

What Happens When Nylon Gets Wet?

Understanding how nylon reacts when exposed to water is crucial for assessing its suitability for various applications, particularly those involving frequent or significant moisture exposure. While nylon is inherently water-resistant to a degree, its physical properties can change when it becomes wet. This section explores the effects of water on nylon, detailing how these changes can impact its performance and longevity in different environments.

Absorption and Weight

    • Moisture Absorption: Nylon can absorb a small amount of water, which increases its weight slightly when wet. This is due to the hygroscopic nature of the nylon fibers, which can retain moisture within their structure.
    • Impact on Weight: The increase in weight is generally minimal but can be noticeable in applications where large quantities of nylon are used, such as in tents or large tarps. This change can affect the handling and performance of nylon products, making them heavier and potentially more cumbersome to manage when wet.

Tensile Strength and Elasticity

    • Reduction in Strength: When nylon absorbs water, there can be a slight decrease in its tensile strength. The absorbed water acts as a plasticizer, reducing the intermolecular forces between the nylon chains and thereby slightly lowering its ability to withstand pulling forces.
    • Increased Elasticity: Conversely, the presence of water can increase the elasticity of nylon. This increased flexibility can be beneficial in some applications, such as in clothing or other textiles where additional give may improve comfort and fit.

Drying and Recovery

    • Drying Process: Nylon dries relatively quickly compared to natural fibers. Its ability to release moisture readily means that it can return to its pre-wet state without significant delay, maintaining the integrity of the fiber over time.
    • Recovery of Properties: After drying, nylon typically regains its original strength and elasticity. Proper care during the drying process, such as avoiding high heat that could degrade the material, ensures that nylon products can be used repeatedly, even after getting wet.

Long-Term Effects

    • Mildew and Mold Resistance: Due to its synthetic nature, nylon is resistant to mildew and mold growth, which can be a significant issue with natural fibers when they remain wet for extended periods.
    • Durability Over Time: Repeated wetting and drying cycles can affect the longevity of nylon, particularly if not cared for properly. Over time, exposure to UV light, combined with moisture, can lead to degradation unless the nylon is specifically treated for enhanced UV resistance.

The reaction of nylon to moisture highlights the importance of understanding its characteristics and limitations when selecting it for specific uses, particularly in environments where it will frequently get wet. By considering these factors, users can better manage and maintain their nylon products, ensuring optimal performance and durability across a range of applications.

nylon rope


Q1: Is nylon naturally waterproof?
A1: No, nylon is not naturally waterproof. It is water-resistant to a degree, meaning it can resist the penetration of water to some extent but not entirely.

Q2: How can I make nylon waterproof?
A2: Nylon can be made waterproof through the application of waterproof coatings or laminates such as silicone, polyurethane, or specialized waterproofing sprays designed for synthetic fabrics.

Q3: What happens to nylon when it gets wet?
A3: When nylon gets wet, it absorbs a small amount of water, which can increase its weight and decrease its tensile strength temporarily. However, it remains more flexible and returns to its original condition once dried.

Q4: Does nylon dry quickly?
A4: Yes, nylon dries relatively quickly compared to natural fibers. This property is beneficial for outdoor clothing and gear, where quick drying after exposure to moisture is advantageous.

Q5: Can repeated wetting and drying weaken nylon?
A5: Repeated cycles of wetting and drying can gradually degrade nylon, especially if it is also exposed to other environmental factors like UV radiation. Proper care, including occasional re-treatments for water resistance and protection from sunlight, can help maintain its integrity over time.


Nylon, a versatile and widely used synthetic fabric, offers a combination of strength, flexibility, and mild water resistance, making it a popular choice for numerous applications. While not inherently waterproof, nylon’s ability to be treated with various coatings and finishes means it can be adapted to suit needs where water exposure is significant. The hygroscopic nature of nylon allows it to absorb a small amount of moisture, which can affect its weight and tensile strength temporarily until it dries. However, its quick drying time and resilience make it suitable for many environments, from outdoor gear to fashion. Proper care and maintenance, including appropriate waterproofing treatments, can extend the life and functionality of nylon products, making them more versatile and durable in facing the challenges posed by moisture.

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