A fibre (also spelled as fiber) is a piece of material which is long, thin and flexible, like a length of thread. Plant fibres are the basis of fabric such as cotton. Silk and wool fibres come from animals. In the 20th century many artificial fibres were invented like nylon and polyester.

They are very important in the structure of plants and animals, because they hold tissues together.

There are many uses for fibres. They can be spun together into filaments, thread, string or rope. They can be woven in fabric or in composite materials

Natural fibre

Natural fibers include those made by plants, animals, and geological processes. They can be classified according to where they came from:

 Vegetable fibers are based on arrangements of cellulose, often with lignin. Examples include cotton, hemp, jute, flax, abaca, piña, ramie, sisal, bagasse, and banana. Plant fibers are used to make paper and textile (cloth). It is also used as dietary fiber.
 Wood fiber is fiber that gotten from trees. They include groundwood, lacebark, thermomechanical pulp (TMP), and bleached or unbleached kraft or sulfite pulps.
 Animal fibers mainly consist of proteins. Examples are silkworm silk, spider silk, sinew, catgut, wool, sea silk and hair.
 Mineral fibers include the asbestos group. Asbestos is the only long mineral fiber that can be found in nature. Six minerals have been classified as "asbestos". They include chrysotile, amosite, crocidolite, tremolite, anthophyllite and actinolite. Short, fiber-like minerals include wollastonite and palygorskite.
 Biological fibers also known as fibrous proteins or protein filaments consist of biologically important proteins, mutations or other genetic defects can lead to severe diseases. For example, the collagen family of proteins, tendon, muscle proteins like actin, cell proteins like microtubules and many others, spider silk, sinew and hair etc.

Man-made fiber
Man-made are fibers that are changed by man. Man-made fibers consist of regenerated fibers and synthetic fibers.

Semi-synthetic fiber
Semi-synthetic fibers are made from raw materials with natural long-chain polymer structures. They are only changed and partially degraded by chemical processes. The first semi-synthetic fiber is rayon. Most semi-synthetic fibers are cellulose regenerated fibers.

Cellulose regenerated fibers 
Cellulose fibers are a type of man-made fibers, regenerated from natural cellulose. The cellulose comes from many sources: rayon comes from tree wood fiber, bamboo fiber comes from bamboo, seacell comes from seaweed, etc.

Some examples of this type of fiber are:

 Rayon
 Bamboo fiber
 Lyocell, a brand of rayon
 Modal
 Diacetate fiber
 Triacetate fiber

Synthetic fiber

Synthetic fibers come from synthetic materials such as petrochemicals.

Metallic fibers 

Metallic fibers can be gotten from ductile metals such as copper, gold or silver and extruded or deposited from more brittle ones, such as nickel, aluminum or iron.

Carbon fiber 

Carbon fibers are fibers that are mostly made up of carbon atoms. Carbon fibers are often based on oxidizing carbonized polymers through pyrolysis  like PAN.

Silicon carbide fiber 
In silicon carbide fibers the basic polymers are not hydrocarbons but polymers. About 50% of the carbon atoms are replaced by silicon atoms.

Fiberglass

Fiberglass are also man-made fibers that come from natural raw materials. It is made from a specific type glass, and optical fiber, which is made from purified natural quartz.

Polymer fibers 

 Polymer fibers are a type of man-made fibers, which are based on synthetic chemicals. These fibers are made from:
 Polyamide nylon
 PET or PBT polyester
 Phenol-formaldehyde (PF)
 Polyvinyl chloride fiber (PVC) vinyon
 Polyolefins (PP and PE) olefin fiber
 Acrylic polyesters
 Aromatic polyamids (aramids)
 Polyethylene (PE), eventually with extremely long chains / HMPE
 Elastomers can even be used
 Polyurethane fiber
 Elastolefin

Related pages
 Textile
 Optical fiber
 Tensile strength

References

Fibers