Nylon 6 And Nylon 66

Definition and Overview

Nylon 6 and Nylon 66 are synthetic fibers whose main component is polyamide. The numbers in the names come from the raw materials, and although both are nylon, their molecular structures differ. They are used in a wide range of forms, including fabric, yarn, and molded parts.

For apparel, Nylon 6 and Nylon 66 may be used on their own or combined with polyurethane and other materials to add stretch. The final properties vary greatly depending on the blend ratio, yarn thickness, weave or knit structure, and finishing.

Features and Hand Feel

Both are characterized by strength relative to their light weight, abrasion resistance, and suppleness. In filament yarns, the surface is relatively smooth, and depending on density and processing, they can be made to look from glossy to matte.

In general, Nylon 66 tends to offer better heat resistance and stiffness than Nylon 6, so it is selected for applications that emphasize strength and abrasion resistance. However, actual performance is also affected by yarn design, structure, dyeing, and resin finishing, so it is important not to judge by the material name alone.

Because nylon does not absorb much moisture, apparel that is worn in high-sweat conditions is adjusted in terms of wearing comfort through knit structures, moisture-absorbing quick-dry finishes, and combination with other fibers. Care is also needed for static electricity, deterioration from ultraviolet light, and deformation from heat.

Main Applications

Because it can be designed from lightweight to heavyweight fabrics, Nylon 6 and Nylon 66 are used in year-round apparel. Items that require light weight and abrasion resistance include outerwear, sportswear, outdoor wear, and bags.

Nylon 6 is also used not only for fibers but also for molded accessories such as cord stoppers and cord ends. When used in apparel, specifications should be considered not only for the fabric itself but also for the accessory materials and durability.

• Outerwear, blousons, windbreakers
• Sportswear, swimwear
• Bags, pouches, backpacks
• Uniforms, workwear
• Molded accessories such as cord stoppers and cord ends

How to Choose and Handling Precautions

When selecting a fabric, check not only whether it is Nylon 6 or Nylon 66, but also the blend ratio, fabric weight, density, yarn type, and surface finish. It is easier to choose if you set in advance the test items required for the intended product use, such as tear strength, abrasion strength, and water repellency.

For washing and heat treatment, avoid high temperatures and follow the care label. Because heat may cause shine, shrinkage, or deformation, start ironing at a low temperature and use a pressing cloth. Dark-colored items may also transfer color due to friction, so colorfastness should be checked beforehand.

In sewing, there are thin fabrics and high-density fabrics where fine needle holes are easy to notice. Match the needle size, thread count, stitch density, and thread tension to the fabric, and confirm needle damage, puckering, and seam shrinkage through trial samples. Because the material can melt with heat, pay attention to pressing conditions as well.

Differences from Similar Terms

Nylon is often used as a general term for polyamide fibers, while Nylon 6 and Nylon 66 indicate the specific types. If the label only says nylon, it may not be possible to tell which one is used.

Polyester is also a representative synthetic fiber, but its chemical structure is different. In general, nylon is selected for applications that make use of its suppleness and abrasion resistance, while polyester is selected for applications that make use of its dimensional stability and ease of handling. However, performance varies depending on the fabric design.

Frequently Asked Questions