This continuous structure allows magnetic attraction to extend along the closure line instead of being concentrated at individual buttons or magnetic snaps. When two cords are brought together, the distributed attraction can create a smoother closure and help reduce localized bulging or puckering in the surrounding fabric. Their slim and flexible construction also allows them to remain largely hidden inside the finished product.
Flexible magnetic cords can be supplied in continuous rolls for cutting during assembly or prepared in specified lengths. Different magnetic compounds, cord dimensions, and cross-sections can be selected to balance attraction, flexibility, product thickness, and the appearance required in finished clothes or bags.
Closure performance through fabric depends on cord size, magnetic compound, fabric thickness, and the total distance between paired cords. Lightweight fabrics may work with smaller and more flexible cords, while bags, padded textiles, and structured products may require larger sections or stronger magnetic compounds.
Material selection should not be based on magnetic powder alone. Cord dimensions, magnetic powder loading, fabric thickness, required closure force, and the bending behavior of finished products should be considered together.
Flexible magnetic cords are commonly produced with round, oval, or rectangular cross-sections. Other profiles can also be developed by changing extrusion dies to suit fabric channels, product thickness, and assembly requirements.
Typical cord dimensions range from approximately 2 to 4 mm. Smaller cross-sections may not contain enough magnetic material to provide useful attraction through fabric, while larger cords can become more visible, less flexible, or too bulky for clothes and lightweight textile products.
Direct ironing over magnetic cords should be avoided. Excessive heat may reduce magnetic performance and can also affect the flexible binder or protective coating. Steam ironing or indirect ironing through surrounding fabric is generally safer, while heat-pressing conditions should be verified with the selected cord and final fabric construction before production.
Dry-cleaning compatibility should not be assumed from machine-washing performance. Cleaning solvents, detergents, temperature, and mechanical action can affect polymer binders and protective coatings differently, so the actual cord and finished product should be tested before dry cleaning is approved.
Depending on application requirements, durability can be evaluated through repeated bending, tensile, artificial perspiration, high-temperature and high-humidity, boiling-water, salt-spray, and thermal-cycling tests. These evaluations help determine whether flexibility, coating integrity, corrosion resistance, and magnetic performance remain suitable over time.
Flexible magnetic cords are naturally dark because of their high magnetic powder content. Uncoated cords can be used directly in black or dark-colored products, while white or color-matched surfaces may be preferred when the cords are installed beneath thin or light-colored fabrics.
Colored versions are produced by dip coating after extrusion. The cords are immersed in a liquid coating and then dried naturally, forming a thin and continuous layer around the surface. White and other custom colors help reduce the dark outline that might otherwise remain visible through surrounding fabric.
Dip coating can also be applied where corrosion protection is required, regardless of the finished color. Black cords may therefore receive a transparent or color-matched protective coating even when no visible color change is required. The coating provides an additional barrier against water, perspiration, and humid environments, while coated cut ends can reduce direct exposure of the magnetic compound.
Coating thickness should remain as thin and uniform as practical. Excessive coating increases the distance between paired magnetic cords and may reduce magnetic attraction, while uneven coating can affect appearance and dimensional consistency.
Because uniform coverage must be maintained during dipping and natural drying, dip-coated magnetic cords are generally supplied in shorter lengths than uncoated cords produced in continuous rolls.
Flexible magnetic cords are often evaluated through samples before final specifications are confirmed. Fabric thickness, sewing structure, required closure force, bending behavior, and product appearance can all affect their performance in finished clothes, bags, and other textile products.
Initial samples can be prepared with different cross-sections, cord dimensions, lengths, and surface treatments. Customers can then evaluate magnetic attraction, flexibility, sewing integration, washing performance, and the overall feel of the closure in their actual product structure.
Based on trial results, cord dimensions, flexibility, coating color, surface protection, and supplied length can be adjusted for further evaluation. This sample-based process is useful when standard product specifications cannot fully represent how magnetic cords will behave after being sewn into the final fabric construction.
Fabric samples, drawings, prototypes, or basic information about the intended closure can help determine a suitable starting sample.
