Microfiber or microfibre refers to synthetic fibers finer than one or 1.3 denier or decitex/thread. By comparison, microfiber is 1/100th the diameter of a human hair and 1/20th the diameter of a strand of silk. The most common types of microfibers are made from polyesters, polyamides (e.g., nylon, Kevlar, Nomex, trogamide), or a conjugation of polyester, polyamide, and polypropylene (Prolen). Microfiber is used to make mats, knits, and weaves for apparel, upholstery, industrial filters, and cleaning products. The shape, size, and combinations of synthetic fibers are selected for specific characteristics, including softness, toughness, absorption, water repellency, electrodynamics, and filtering capabilities.
Production of ultra-fine fibers (finer than 0.7 denier) dates back to the late 1950s, using melt-blown spinning and flash spinning techniques. However, only fine staples of random length could be manufactured and very few applications could be found. Experiments to produce ultra-fine fibers of a continuous filament type were made subsequently, the most promising of which were run in Japan during the 1960s by Dr. Miyoshi Okamoto. Okamoto's discoveries, together with those of Dr. Toyohiko Hikota, resulted in many industrial applications. Among these was Ultrasuede, one of the first successful synthetic microfibers, which found its way onto the market in the 1970s. Microfiber's use in the textile industry then expanded. Microfibers were first publicized in the early 1990s in Sweden and saw success as a product in Europe over the course of the decade. In 2007, Rubbermaid began a line of microfiber products for American markets, the first major company to do so.
Microfiber fabric is often used for athletic wear, such as cycling jerseys, because the microfiber material wicks moisture (sweat) away from the body, keeping the wearer cool and dry. Microfiber is also very elastic, making it suitable for undergarments. However, the US Marine Corps banned synthetic fabrics in forward environments due to melting and burn risk.
Microfiber is also used to make tough, very soft-to-the-touch materials for general clothing use, often used in skirts and jackets. Microfiber can be made into Ultrasuede, an animal-product-free imitation suede that is cheaper and easier to clean and sew than real suede.
Microfiber is used to make many accessories that traditionally have been made from leather: wallets, handbags, backpacks, shoes, cell phone cases, and coin purses. Microfiber fabric is lightweight, durable, and somewhat water repellent, so it makes a good substitute. Animal rights activists prefer cloth products over leather products because no animals are slaughtered during the manufacture of cloth products.
Another advantage of fabric (compared to leather) is that fabric can be coated with various finishes or can be treated with anti-bacterial chemicals. Fabric can also be printed with various designs, embroidered with colored thread, or heat-embossed to create interesting textures.
Other Uses 
Textiles for cleaning 
In cleaning products microfiber is a blend of polyester and polyamide (nylon). In higher quality cleaning textiles the fiber is split during the manufacturing process to produce spaces in each fiber. If you were to look at a cross section of split microfiber it would look like an asterisk. It's the split fiber working in conjunction with the space between them that do the work. They pick up and hold the dust and dirt, and absorb liquid.
For microfiber to be effective as a cleaning product it has to be split microfiber. If microfiber isn't split during manufacturing, it isn't much more than a very soft cloth, duster, or mop. Microfiber that is used in clothing, furniture, and other applications isn't split because it isn't designed to be absorbent, just soft. It's important when buying microfiber cleaning products to make sure that they're split. When buying from a retail store, if the packaging doesn't say its split, don't assume it is. One way to determine if the microfiber is split is to run the palm of your hand over it. If it grabs the imperfections on your skin then it's split. Another way is to pour a small amount of water on a table and take a towel or mop and try to push the water. If the water is pushed it's not split microfiber; if the water is absorbed or sucked into the fabric, then it is split microfiber.
In addition to the open spaces in the fibers created during the splitting process, microfiber is an effective cleaning tool because the fibers are positively charged. Dirt and dust are negatively charged so they are attracted to microfiber like a magnet. The microfiber holds on to the dust and dirt until it's released in the laundering process or when it's rinsed out.
Microfiber products used for consumer cleaning are generally constructed from split conjugated fibers of polyester and polyamide. Microfiber used for commercial cleaning products also includes many products constructed of 100% polyester microfiber. Fabrics made with microfibers are exceptionally soft and hold their shape well. When high-quality microfiber is combined with the right knitting process, it creates an extremely effective cleaning material. This material can hold up to eight times its weight in water. Microfiber products have exceptional ability to absorb oils, and are not hard enough to scratch even paintwork unless they have retained grit or hard particles from previous use.
Microfiber is widely used by car detailers to handle tasks such as removing wax from paintwork, quick detailing, cleaning interior, cleaning glass, and drying. Due to their fine fibers which leave no lint or dust, microfiber towels are used by car detailers and enthusiasts in a similar manner to a chamois leather.
Microfiber is used in many professional cleaning applications, for example in mops and cleaning cloths. Although microfiber mops cost more than non-microfiber mops, they may be more economical because they last longer and require less effort to use.
Microfiber textiles designed for cleaning clean on a microscopic scale. According to tests using microfiber materials to clean a surface leads to reducing the number of bacteria by 99%, whereas a conventional cleaning material reduces this number only by 33%. Microfiber cleaning tools also absorb fat and grease and their electrostatic properties give them a high dust-attracting power.
Microfiber cloths are used to clean photographic lenses as they absorb oily matter without being abrasive or leaving a residue, and are sold by major manufacturers such as Sinar, Nikon and Canon. Small microfiber cleaning cloths are commonly sold for cleaning computer screens and eyeglasses.
Microfiber is unsuitable for some cleaning applications as it accumulates dust, debris, and particles. Sensitive surfaces (such as all high-tech coated surfaces e.g. CRT, LCD and plasma screens) can easily be damaged by a microfiber cloth if it has picked up grit or other abrasive particles during use. One way to minimize the risk of damage to flat surfaces is to use a flat, non-rugged microfiber cloth, as these tend to be less prone to retaining grit.
Rags made of microfiber must only be washed in regular washing detergent, not oily, self-softening, soap-based detergents. Fabric softener must not be used. The oils in the softener and self-softening detergents will clog up the fibers and make them less effective until the oils are washed out.
Microfiber materials such as PrimaLoft are used for thermal insulation as a replacement for down feather insulation in sleeping bags and outdoor equipment, due to their better retention of heat when damp or wet.
With microfiber basketballs already popular worldwide and in FIBA, the NBA proposed the use of a microfiber ball for the 2006–07 season. The ball, which is manufactured by Spalding, does not require a "break-in" period of use as leather balls do, and has the ability to absorb water and oils, meaning that sweat from players touching the ball is better absorbed, making the ball less slippery. Over the course of the season, the league received many complaints from players who found that the ball bounced differently from leather balls, and that it left cuts on their hands. On January 1, 2007, the league scrapped the use of all microfiber balls and returned to leather basketballs.
Microfibers used in tablecloths, furniture, and car interiors are designed to repel wetting and consequently are difficult to stain. Microfiber tablecloths will bead liquors until they are removed and are sometimes advertised showing red wine on a white tablecloth that wipes clean with a paper towel. This and the ability to mimic suede economically are common selling points for microfiber upholstery fabrics (e.g. for couches).
Microfibers are used in towels especially those to be used at swimming pools as even a small towel dries the body quickly. They dry quickly and are less prone than cotton towels to become stale if not dried immediately. Microfiber towels need to be soaked in water and pressed before use, as they would otherwise repel water as microfiber tablecloths do.
Environmental and safety issues 
Microfiber textiles tend to be flammable if manufactured from hydrocarbons (polyester) or carbohydrates (cellulose) and emit toxic gases when burning, more so if aromatic (PET, PS, ABS) or treated with halogenated flame retarders and aromatic dyes. Their polyester and nylon stock are made from petrochemicals, which are not a renewable resource and are not biodegradable. However, if made out of polypropylene, they are 100% recyclable (Prolen).
For most cleaning applications they are designed for repeated use rather than being discarded after use. (An exception is the precise cleaning of optical components where a wet cloth is drawn once across the object and must not be used again as the debris collected and now embedded in the cloth may scratch the optical surface.) In many household cleaning applications (washing floors, furniture, etc.) microfiber cleaning fabrics can be used without detergents or cleaning solutions which would otherwise be needed.
There are environmental concerns about this product entering the oceanic food chain. However, no pesticides are used for producing synthetic fibres (in comparison to cotton). If these products are made of polypropylene yarn, the yarn is dope-dyed; i.e. no water is used for dyeing (as with cotton, where thousands of litres of water become contaminated).
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