Rayon is a semi-synthetic fabric made from plant cellulose, most commonly wood pulp. It sits in an unusual category: neither fully natural nor fully synthetic. The raw material comes from trees or cotton, but turning that plant matter into wearable fiber requires an intensive chemical process. The result is a lightweight, silky fabric that has been used as an affordable alternative to silk since the early 1900s.
How Rayon Is Made
Rayon production starts with cellulose, the structural fiber found in plant cells. Wood pulp is the primary source today, though cotton and even cereal straws can be used. The pulp must be refined to nearly pure “alpha” cellulose, stripped of natural waxes, resins, and other plant compounds before processing can begin.
The most common method is the viscose process, which accounts for about 80% of all rayon produced. Wood pulp is soaked in a strong sodium hydroxide solution to create what’s called alkali cellulose. That material is shredded, aged, then treated with carbon disulfide to form a new compound called cellulose xanthate. This orange-colored substance is dissolved in a weaker sodium hydroxide solution, producing a thick, syrupy liquid called viscose. The viscose is then forced through tiny holes in a device called a spinneret (think of a showerhead) into an acid bath. The acid strips away the chemical modifications and regenerates pure cellulose, but now in the form of fine, continuous filaments. Those filaments are washed, drawn, and cut into fiber ready for spinning into yarn.
The whole sequence involves over a dozen distinct steps, from steeping through pressing, shredding, aging, dissolving, ripening, filtering, degassing, spinning, drawing, washing, and cutting. It’s a far cry from simply harvesting cotton or shearing wool.
Types of Rayon
Not all rayon is the same. The term covers a family of fibers that differ in how they’re processed and what they feel like.
- Viscose rayon is the original and most common type. It has a smooth, fluid drape and a soft hand feel, but it’s the least durable of the group and loses significant strength when wet.
- Modal follows the same basic viscose process but with modifications to the spinning bath chemistry, producing a fiber with better strength and softness. It’s typically made from beech tree pulp and is popular in underwear and activewear.
- Lyocell (often sold under the brand name Tencel) takes a fundamentally different approach. Instead of the multi-step viscose chemistry, cellulose pulp is dissolved directly in a non-toxic organic solvent. No carbon disulfide or sodium hydroxide is needed. The solvent is recoverable and reusable, making this the most environmentally friendly rayon variant. Lyocell can also incorporate recycled cotton textile waste into its feedstock.
- Cupro is made by dissolving cellulose in a solution of copper salts and ammonia. It produces an extremely fine, silk-like fiber. Only one manufacturer, Japan’s Asahi Kasei, still produces it commercially.
What Rayon Feels Like
Rayon was originally marketed as “artificial silk,” and that comparison still holds. The fabric has a smooth, silky surface that drapes fluidly and feels gentle against skin. Compared to cotton, which has a crisper texture and more body, rayon is lighter and more flowing. Cotton softens gradually with repeated washing, while rayon feels soft from the start.
Rayon breathes well, though not quite as effectively as cotton during prolonged wear. Its moisture absorption is notably high. Rayon fibers have an official moisture regain of 11%, compared to just 0.4% for polyester and 4.5% for nylon. That high absorbency is part of why rayon feels cool and comfortable in warm weather, but it’s also the source of the fabric’s biggest weakness.
Durability and Wet Strength
Rayon’s dry tensile strength is already modest, ranging from 2.2 to 2.7 cN/dtex (a standard measure of fiber strength). For comparison, polyester ranges from 4.1 to 5.7, and nylon from 4.0 to 6.6. But the real problem shows up when rayon gets wet. Its strength drops to just 1.2 to 1.8 cN/dtex, a loss of roughly 35 to 55%. Polyester loses no strength at all when wet.
This means rayon fibers are most vulnerable during washing. Aggressive agitation in a washing machine can stretch, distort, or break the weakened fibers. It’s why rayon garments often carry “dry clean only” labels, and why the fabric has a reputation for shrinking unpredictably. Over time, the lower durability also means rayon garments tend to wear out faster than cotton or synthetic alternatives, which can offset the lower upfront cost.
How to Care for Rayon
If you want to wash rayon at home, hand washing in cool or cold water with a mild detergent is the safest approach. Gently agitate the fabric rather than wringing or twisting it. Lay the garment flat to air dry.
Machine washing is possible if you use cold water and a delicate cycle. Avoid hot water entirely, as heat accelerates shrinkage. If you machine dry, use the lowest heat setting, though air drying is the better choice. The goal is always to minimize stress on the fibers while they’re wet and at their weakest.
Environmental Concerns
Rayon occupies a complicated spot environmentally. The raw material is renewable (trees regrow, unlike petroleum), but the manufacturing process raises serious concerns.
The viscose process relies heavily on carbon disulfide, a chemical that is hazardous when inhaled and toxic to freshwater ecosystems. The U.S. EPA has documented that wastewater from viscose manufacturing facilities frequently exceeds safe levels for aquatic life. In one review, 47% of measured discharge concentrations exceeded the chronic freshwater toxicity threshold, and 28% exceeded the acute toxicity level. Workers in viscose factories face occupational exposure risks as well, with strict limits set by OSHA at 30 ppm for short-term peaks.
Beyond chemistry, there’s the question of where the wood comes from. Rayon production consumes enormous quantities of wood pulp, and not all of it is sourced from sustainably managed forests. Organizations like Canopy Planet publish annual assessments of rayon producers, evaluating their forest sourcing, traceability, and use of FSC-certified fiber. If sustainability matters to you, look for rayon products from producers rated well in these assessments, or choose lyocell, which eliminates the most harmful chemicals from the process.
Common Uses
Rayon’s drape and silk-like feel make it a go-to for dresses, blouses, skirts, and linings. It’s also widely used in bedding, curtains, and upholstery where a smooth, flowing look is desired. Modal rayon shows up frequently in t-shirts and underwear because of its softness and moisture absorption. Lyocell appears in activewear, denim blends, and home textiles.
The fabric takes dye readily and produces vibrant, rich colors. It blends well with other fibers, so you’ll often find rayon mixed with polyester for added durability, or with spandex for stretch. When you see a lightweight, drapey garment at an affordable price point that looks and feels like silk, it’s very likely rayon.
Rayon vs. Cotton vs. Silk
Rayon costs less than silk while closely mimicking its look and feel. If you want flowing, elegant lines in a garment without paying silk prices, rayon delivers. But silk is far more durable and holds up better over time, so the savings come with a tradeoff in longevity.
Cotton generally offers better value for everyday basics. It’s tougher, easier to wash, and improves with age. Rayon wins when you want something that looks dressier or drapes more fluidly. Cotton holds its shape, which makes it better for structured pieces like button-down shirts or chinos. Rayon is the better choice for wrap dresses, flowy tops, and anything where movement and softness matter more than crisp structure.