I. Mechanical Properties: The "Double Champion" of Strength and Abrasion Resistance
Nylon vs. Polyester / Acrylic
Nylon's breaking strength can reach 4–9 cN/dtex (higher than polyester's 4–7 cN/dtex and acrylic's 2.5–4.5 cN/dtex), making it especially suitable for scenarios requiring high-strength support, such as:
Industrial fields: Tire cord (replacing steel wire to reduce tire weight), lifting slings (30% increase in load-bearing capacity under the same specifications).
Outdoor equipment: Climbing ropes (50% longer wear life than polyester ropes), parachute fabrics (outstanding tear resistance).
Abrasion resistance is Nylon's "trump card": its abrasion index is 2–3 times that of polyester and 10 times that of cotton fiber, making it the preferred material for socks, sports backpack shoulder straps, and carpets (e.g., nylon stockings are far more durable than polyester stockings).
II. Elasticity and Comfort: The "Flexible King" in Close-Fitting Scenarios
Resilience: The breaking elongation of nylon fiber can reach 20%–45% (polyester is 15%–30%), and it has a fast rebound speed and is not easily deformed, suitable for scenarios that require long-term elasticity maintenance:
Clothing field:
Sportswear: Yoga pants, fitness wear (close-fitting to the body curve, quickly returning to its original state after exercise).
Underwear: Softer and more skin-friendly than polyester, and remains unchanged after multiple washes (e.g., nylon 66 bra straps).
Industrial textiles: Medical elastic bandages (precise pressure and comfortable wear), sports insoles (better cushioning and rebound performance than EVA material).
Moisture absorption: Nylon's regain is 3.5%–5.0% (higher than polyester's 0.4% and polypropylene's almost no moisture absorption), making it more breathable when worn and reducing stuffiness, suitable for summer sportswear, outdoor quick-drying clothing, etc.
III. Chemical Stability: The "Survival Expert" in Complex Environments
Chemical corrosion resistance:
Alkaline resistance is superior to polyester (can withstand long-term immersion in 5% sodium hydroxide solution), suitable for industrial filter cloths, chemical protective clothing, etc.
Excellent organic solvent resistance (e.g., gasoline, lubricating oil), widely used in automotive fuel pipe linings, mechanical seals, etc. (replacing rubber to reduce costs).
Resistance to insect pests and mildew: Natural fibers (such as wool and cotton) are easily affected by insect pests and mildew, while nylon is completely unaffected, suitable for storage tarpaulins, military sleeping bags, and ancient book restoration paper for long-term storage.
IV. Lightweight and Processing Adaptability: The "All-rounder" in Industrial Scenarios
Density advantage: Nylon has a density of 1.14 g/cm³, lower than polyester (1.38 g/cm³) and wool (1.32 g/cm³), making it lighter for the same volume, suitable for:
Aerospace: Aircraft weight reduction components (such as seat belts, 20% lighter than polyester belts), satellite parachute materials.
Textile field: Lining of down jackets (nylon fabric is lighter, improving fluffiness).
Processing flexibility:
Special cross-section fibers such as triangles and hollow fibers can be produced through special spinnerets, enhancing the luster of the fabric (such as nylon satin dresses) or warmth (such as hollow nylon wadding).
The melt spinning temperature (220–280℃) is lower than that of polyester (250–290℃), resulting in lower energy consumption and suitable for blending with other fibers (such as nylon/cotton blended denim, improving wear resistance while maintaining breathability).
V. Functional Expansion: The "Potential Stock" in Smart and Special Scenarios
Conductive modification: By compounding carbon nanotubes or metal coatings, nylon can be made into anti-static fibers, used in electronic workshop work clothes, explosion-proof dust removal filter bags (15% lower cost than polyester conductive fibers).
Biocompatibility: The chemical structure of nylon 6 is similar to human amino acids, and can be used for absorbable surgical sutures (the degradation cycle can be adjusted by controlling the degree of polymerization), while polyester cannot be used in such scenarios due to its poor biocompatibility.
Flame retardancy and high temperature resistance: Through copolymerization or post-treatment processes, nylon can reach flame retardant standards (such as UL94 V-0 grade), used in mine work clothes, automotive interior fabrics (replacing some flame-retardant acrylic fibers to reduce smoke generation).
VI. Sustainability: The "Green Pioneer" in the Circular Economy
Chemical recycling advantages: The closed-loop recycling technology of nylon 6 (such as caprolactam regeneration) is mature, and waste clothing can be completely depolymerized into monomers for reuse, while the chemical recycling of polyester is more difficult (requiring high-temperature cracking and lower purity).
Bio-based nylon: such as polyamide 11 (raw material from castor oil) has a 40% lower carbon footprint than traditional nylon 66, suitable for environmentally friendly outdoor equipment, maternal and infant textiles, etc., while the mechanical properties of bio-based polyester (such as PLA) cannot match nylon.