Silk unit Silk fabric has a very magic unit, Mmi, the English abbreviation is MM. People who do not know silk fabrics, if they only see MM, they will think it means millimeters. In fact, this is not the case. The MM is not a direct thickness unit. It is just a reflection of the weight of silk fabrics. The conversion between it and grams is 1 um meter = 4.3056 grams per square meter.
Silk fabrics are usually 8mm, 12mm, 16m, 19m, 30m, which means that the larger the number, the heavier the fabric, and the price of silk fabrics follows the weight, so The larger the rice, the higher the price.
Silk discerns gloss. The luster of silk fabrics is soft and even, bright but not dazzling. Although the rayon fabric is bright, it is not soft. Although the gloss of polyester yarn is uniform, it has glitter or bright silk. Nylon silk has a poor gloss, as if coated with a layer of wax. Feel by hand. There is a handle feel when you touch the silk fabric, but other chemical fiber products do not have this feel. Rayon fabrics are smooth and soft but not stiff. Cotton silk does not feel soft. Scrutinize the crease. When the silk fabric is tightly squeezed by hand and then released, it has no creases due to its good elasticity.
Rayon fabrics have obvious creases after pinching, and the creases are difficult to restore to their original state. Although the nylon silk fabric has creases, it can slowly return to its original state, so it must not be confused by its false appearance. Test fiber pull. Take out a few fibers at the edge of the fabric, and wet it with your tongue. If it is easy to break at the wet place, it means rayon, otherwise it is a silk fabric. Listen to the sound of friction. Because the silk surface is protected by sericin and abrasion-resistant, dry silk fabrics emit a sound when they rub each other, while other chemical fiber products do not appear. The best way to tell true and false is to burn, not to draw silk, it is best to burn a small piece, because in silk blending, warp and weft are not necessarily 100% silk. Silk is flame retardant, no open flame, odor, and twisted by hand after burning, powdery.