Polyamide Nylon 66 staple Fiber HT high tenacity 1.5D*38mm/51mm cotton spinning type upon 6.00cn/dtex

2. Mechanical Performance Advantages of Spun Yarns

(Core High-Strength Properties)

2.1 Superior tensile strength with higher bearing capacity at the same denier

The strength of high-strength PA66 yarn reaches 8–10 cN/dtex, 20%~25% higher than ordinary Nylon 6 yarn of the same specification. To meet the same tensile load requirement, finer denier yarns can be adopted to realize product lightweighting.

When applied to load-bearing woven belts, safety sewing threads, and lifting ropes, it provides a higher safety margin and effectively prevents thread breakage and seam cracking.

2.2 High resilience and low creep with no deformation under repeated stress

PA66 yarn has an elastic recovery rate of 65%~85% (under 5% elongation), which can quickly restore its original state after tension unloading. It shows negligible creep under long-term continuous load, avoiding slackness and elongation under long-term tension and bearing. It is ideal for safety belts, luggage handles, and elastic wear.

resistant fabrics with permanent structural stability.

2.3 Excellent wear resistance and fatigue resistance against repeated bending breakage

With self-lubricating properties, its wear resistance is over 20% higher than Nylon 6. It withstands repeated friction and bending fatigue, retaining much higher strength after tens of thousands of friction and bending cycles than polyester and ordinary

nylon yarns. When made into sewing threads, it resists breakage and hair cracking during high-speed sewing and thick leather piercing.

2.4 Outstanding impact toughness with no brittle fracture at low temperatures

It maintains high toughness at extremely low temperatures down to -40℃ without

hardening or brittle cracking. It is the preferred spinning material for alpine outdoor products, cold-chain equipment, and winter labor protection fabrics, making up for the defects of brittle failure of polyester and insufficient strength of polypropylene at low temperatures.

3. Adaptability Advantages for Downstream Weaving

and Sewing

3.1 Breakage-free high-speed sewing with stable industrial stitching performance

High-strength PA66 yarn features low hairiness and tight filament cohesion. It avoids needle skipping, thread breakage, and needle hole melting adhesion during high-

speed sewing and thick leather/automotive interior stitching. With excellent

resistance to high needle temperature during continuous sewing, it greatly improves sewing efficiency and reduces machine downtime for thread replacement.

3.2 Low weaving end breakage and few grey fabric defects

Thanks to high breaking strength and knot strength, PA66 yarn reduces warp and weft end breakage during shuttle weaving, warp knitting, and circular knitting. It

minimizes machine downtime for splicing and fabric defects such as missing warp and weft, lowering the defective rate and improving loom productivity.

3.3 Excellent fabric tear strength and bursting resistance

Fabrics woven from PA66 yarn show significantly better tear resistance and bursting strength than Nylon 6 fabrics of the same weight. Outdoor jackets, workwear,

Luggage fabrics and conveyor belt base fabrics made of PA66 yarn are more resistant to tearing and sharp object scratching.

4. Long-Term Service and Environmental Resistance

Advantages of Finished Yarns & Fabrics

4.1 Excellent dimensional stability with low moisture absorption and shrinkage. The dense hydrogen bond structure endows PA66 with lower moisture absorption

than Nylon 6, ensuring low shrinkage of yarns and fabrics under changing

temperature and humidity. It avoids elongation and deformation of workwear and outdoor fabrics after long-term washing and maintains permanent dimensional stability of woven belts and safety belts.

4.2 Chemical corrosion resistance for special working condition products

It resists weak acids, weak alkalis, most organic solvents, and oil stains. PA66 spun products such as filter fabrics, environmental woven belts, and chemical hose lining fabrics are not easily degraded by corrosion, with slower strength attenuation than cotton and polyester products in oily environments.

4.3 Weathering and aging resistance for prolonged outdoor service life

PA66 has better basic UV and oxidation resistance than Nylon 6. With UV-resistant masterbatch added during spinning, it shows slow strength attenuation under long-

term outdoor exposure. It greatly extends the service life of outdoor products such as tents, climbing ropes, automotive safety woven belts, and sunshade fabrics.

5. Comprehensive Advantage Comparison with Other

Fiber Yarns