Hook and loop fasteners consist of two distinct pieces. There is the rough side, known as hook because it is covered with several tiny hooks per square inch, and there is the soft side, known as loop because it is covered with many small loops. When the two sides are pressed together, the hooks engage the loops. This creates a bond that is exceptionally strong and allows for repeated use that lasts for thousands of cycles.


What Is Hook And Loop Made Of?

Most hook and loop fasteners are made out of nylon, but there are several different monofilament materials such as polyester and polypropylene that are also used. Monofilament is a single, continuous strand of synthetic fiber (as opposed to woven fibers) used in fishing line, tennis racquets and medical sutures. Nylon is durable, tough and light in weight. It can withstand high temperature variations but has a low resistance to ultraviolet light. Polyester, on the other hand, is resistant to ultraviolet light but has a lower tolerance when it comes to high temperatures. Nylon and polyester are also hydrophobic materials, meaning they do not easily absorb water.

How Is Hook And Loop Made?

The simple concept of the hook and loop design took a while to perfect before evolving into the technology of today. The hook side is created by weaving nylon under hot, infrared light. The nylon monofilament used in the making of the hooks keeps its shape and is very resilient. After weaving, the nylon loops get trimmed off, creating many hooks that then match up with the loops in the soft side. These hooks need to be cut in just the right place so that they can adhere to the loop side and be fastened and unfastened many times.


Hook and loop fasteners are available in sew on and peel and stick versions as well as many specialized varieties of hooks and loops. This very unique and convenient fastening system is used in a broad range of industries around the world, including aerospace, automotive, medical and military sectors.