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Fibers & Raw Materials
Textile fibers fall into three families: natural (cotton, wool, silk, linen), synthetic (polyester, nylon), and man-made cellulosic (viscose, lyocell), spun from regenerated wood pulp. Each origin shapes properties, processing, and end use. Recycled and bio-based feedstocks increasingly cut across all three categories.
Last updated June 2026
What are the three main fiber families?
Textile fibers are grouped by origin. Natural fibers are harvested directly from plants or animals: plant (cellulosic) fibers include cotton, linen (flax), hemp, and jute, while animal (protein) fibers include wool, other animal hairs, and silk. Synthetic (man-made) fibers are polymers built from petrochemical raw materials and extruded through spinnerets; common examples are polyester, nylon (polyamide), acrylic, and elastane. Man-made cellulosic fibers (MMCF) bridge the two: they are regenerated from natural cellulose-typically wood pulp-but chemically processed and extruded like synthetics. Viscose (rayon), modal, lyocell, and cupro belong here. The distinction matters because origin drives moisture behavior, dyeing, processing, and care.
How do natural fibers differ from one another?
Among plant fibers, cotton is a soft, absorbent, breathable staple fiber that is comfortable against the skin and easy to dye, though it wrinkles and dries slowly. Linen, spun from flax, is stronger than cotton, highly absorbent, and cool to wear, with a characteristic crisp handle and tendency to crease. Among animal fibers, wool is a protein (keratin) fiber prized for warmth, resilience, elasticity, and natural crimp that traps air; it absorbs moisture while feeling dry and has inherent flame resistance. Silk, a continuous protein (fibroin) filament reeled from the cocoon, is exceptionally fine and smooth with a natural luster, high tensile strength for its weight, and good drape.
What defines synthetic fibers like polyester and nylon?
Synthetic fibers are made by polymerizing petrochemical-derived monomers, then melt- or solution-spinning the polymer through a spinneret into continuous filament. Because they are thermoplastic, they can be heat-set to hold pleats, shapes, and texture. Polyester is strong, dimensionally stable, wrinkle- and abrasion-resistant, quick-drying, and hydrophobic, which makes it easy-care but less breathable than cotton. Nylon (polyamide) is notably strong, elastic, and abrasion-resistant with a smooth surface, widely used in hosiery, activewear, and performance textiles. Synthetics are often blended with natural fibers to combine durability and easy care with comfort, and their filament form can be cut into staple to spin yarns resembling natural fibers.
What are man-made cellulosic fibers, and how are they produced?
Man-made cellulosic fibers start from natural cellulose-usually wood pulp-that is dissolved and regenerated into filament. The traditional viscose process converts pulp into a soluble compound, then regenerates cellulose as it is extruded into a coagulating bath. Lyocell is produced by a different, closed-loop solvent route in which the solvent is largely recovered and reused. Modal is a modified, higher-strength rayon variant. These fibers deliver the absorbency, breathability, and soft drape associated with cellulose, combined with the uniformity and continuous-filament capability of manufactured fibers. They dye readily and feel cool; standard viscose tends to lose strength when wet, while lyocell and modal are engineered for notably better wet strength.
Where do recycled and bio-based fibers fit in?
Recycled and bio-based approaches cut across all three families rather than forming a separate one. Recycled synthetics-most commonly recycled polyester (rPET) made from reclaimed PET-reuse existing polymer feedstock, while mechanically or chemically recycled cotton and wool reclaim fibers from textile or production waste. Bio-based fibers use renewable plant-derived raw materials in place of fossil inputs, and man-made cellulosics are themselves derived from renewable wood cellulose. Recycled inputs generally aim to reduce reliance on virgin petroleum and primary raw materials, though fiber properties can vary with feedstock quality and the share of recycled content in a blend.
Qualitative comparison: natural vs synthetic vs man-made cellulosic fibers
| Property / Trait | Natural (e.g., cotton, wool, silk, linen) | Synthetic (e.g., polyester, nylon) | Man-made cellulosic (e.g., viscose, lyocell) |
|---|---|---|---|
| Origin | Plant or animal sources | Petrochemical-derived polymers | Regenerated from natural cellulose (wood pulp) |
| Raw material base | Renewable, agricultural / animal | Largely fossil-based (virgin or recycled) | Renewable cellulose, chemically processed |
| Fiber form | Mostly staple (silk is filament) | Filament, can be cut to staple | Filament, can be cut to staple |
| Moisture / absorbency | Generally absorbent, breathable | Hydrophobic, quick-drying | Absorbent, breathable |
| Handle / drape | Varies: soft to crisp, natural character | Smooth, often uniform | Soft, fluid drape |
| Thermoplastic / heat-set | No (can scorch or felt) | Yes, heat-settable | No |
| Wet strength | Varies; wool weaker wet, linen strong | High, stable when wet | Varies; standard viscose lower wet, lyocell/modal stronger |
| Typical strengths | Comfort, breathability, natural feel | Durability, easy care, resilience | Comfort with manufactured uniformity |
Key terms
Natural fiberSynthetic fiberMan-made cellulosic fiber (MMCF)Staple fiberFilamentCelluloseProtein fiber (keratin / fibroin)Viscose (rayon)LyocellPolyesterNylon (polyamide)ThermoplasticSpinneretRegenerated fiberRecycled polyester (rPET)Bio-based fiberCrimpGSM (grams per square metre)