What Is Lyocell? Tencel, Modal and Viscose Explained

Contents8 sections

1. What is lyocell fibre made from?
2. How is lyocell made and why does its process matter?
3. Lyocell vs modal vs viscose: what is the difference?
4. How can you identify good lyocell fabric before buying?
5. How do you sew and care for lyocell fabric?
6. What practical details do beginners miss with lyocell?
7. What are common lyocell mistakes and how do you fix them?
8. FAQ

What is lyocell? Lyocell is a regenerated cellulose fibre made by dissolving purified wood pulp and reforming it into textile fibres. It is neither a natural fibre in the way cotton is nor a fully synthetic fibre such as polyester: the raw material is plant-based cellulose, but it is chemically processed into fibre.

Lyocell is widely known through the TENCEL™ brand, although TENCEL™ is a brand name rather than the generic name for every lyocell fibre. Below, we explain how lyocell is made, why it feels different from viscose and modal, what its sustainability claims mean, and how to buy, sew, wash, and identify good lyocell fabric.

What’s in this article8 sections

What is lyocell fibre made from?

Lyocell fibre is made from cellulose, most commonly purified wood pulp, which is dissolved and spun into continuous filaments or staple fibre. Cellulose is the same structural polymer found in cotton, linen, and wood, so lyocell belongs to the broader family of regenerated cellulosic fibres.

Manufacturers first remove lignin and other non-cellulose material from wood to make dissolving pulp. They dissolve that pulp in a solvent, then extrude the thick solution through a spinneret: a metal plate containing many very fine holes. In a water bath, cellulose regenerates as solid fibre, which is washed, dried, crimped if needed, and cut into staple lengths or kept as filament yarn.

That route gives lyocell a round, smooth fibre surface compared with cotton’s twisted ribbon-like shape. Smooth fibres slide readily against one another, which helps explain lyocell’s soft hand and fluid drape. It can also mean that some fabrics shift while cutting or show abrasion marks if their surface is repeatedly rubbed.

Is TENCEL™ the same as lyocell?

TENCEL™ is a branded range that includes lyocell and modal fibres, while lyocell is the generic fibre name used on composition labels. A garment labelled “100% lyocell” may or may not contain TENCEL™ branded fibre. A garment marketed as TENCEL™ should still state the actual fibre composition, such as 100% lyocell or a lyocell-cotton blend.

Brand names can indicate a defined sourcing and processing programme, but they do not tell you the fabric construction, weight, dye quality, or finishing method. Read the fibre-content label and care label before treating a branded name as a quality guarantee.

How is lyocell made and why does its process matter?

Lyocell is made by directly dissolving cellulose in an amine oxide solvent, commonly N-methylmorpholine N-oxide (NMMO), then regenerating cellulose in water. This differs from conventional viscose production, which chemically converts cellulose into another compound before it is dissolved and regenerated.

Lyocell production is often described as a closed-loop process because solvent and water can be recovered and reused at high rates in a well-run system. That is a meaningful process advantage, but it is not a blanket environmental verdict. Wood origin, pulp bleaching, energy supply, chemical management, transport, dyeing, finishing, garment durability, and end-of-life all affect the final impact.

LyocellvsViscose

Dissolving route

Lyocell: NMMO solvent

Viscose: Chemical derivatisation route

Solvent recovery

Lyocell: Usually high recovery

Viscose: Varies by producer

Wet strength

Lyocell: Generally stronger

Viscose: Often lower

Common handle

Lyocell: Smooth, fluid

Viscose: Soft, fluid

Care sensitivity

Lyocell: Abrasion can show

Viscose: Can weaken when wet

Both are regenerated cellulose fibres, but their manufacturing routes and common fabric behaviour differ.

Why lyocell can feel cool and absorbent

Cellulose has many sites that attract water molecules, so lyocell absorbs moisture vapour more readily than polyester. In clothing, this can make the fabric feel less clammy when you sweat. Absorbency is not the same as fast drying, however: a heavy 220 GSM lyocell jersey can hold substantial water and may dry more slowly than a light polyester knit.

Fibre properties also do not override fabric structure. An open 120 GSM woven lyocell shirt fabric breathes and dries differently from a dense 300 GSM lyocell twill trouser fabric. Compare GSM, weave or knit construction, and garment fit rather than relying only on the fibre name.

Why lyocell sometimes fibrillates

Lyocell can fibrillate when wet fibres experience repeated rubbing. Tiny fibrils lift from the fibre surface, producing a pale, peach-skin, suede-like, or washed-looking effect. Some mills deliberately encourage and control fibrillation to create a soft finish; uncontrolled fibrillation can look like uneven wear, especially on dark colours.

Fibre cross-linking, enzyme finishing, fabric construction, and careful wet processing can reduce unwanted fibrillation. At home, turning garments inside out, avoiding overloaded wash loads, and following the care label reduce surface rubbing. If you want to understand how regenerated cellulose takes colour, our guide to dyeing viscose fabric explains the related dyeing behaviour and its practical limits.

Lyocell vs modal vs viscose: what is the difference?

Lyocell, modal, and viscose are all regenerated cellulose fibres, but they use different manufacturing routes and are engineered for somewhat different performance. They can overlap in how they feel, so a fabric label gives more reliable information than touch alone.

Feature	Lyocell	Modal	Viscose/rayon
Generic fibre family	Regenerated cellulose	Regenerated cellulose	Regenerated cellulose
Typical raw material	Purified wood pulp	Purified wood pulp	Wood pulp or other cellulose
Typical process	Direct solvent dissolution	Modified viscose route	Viscose process
Wet strength	Generally good	Generally good	Often lower
Common uses	Shirting, denim, bedding, knits	Underwear, tees, knit blends	Dresses, linings, blouses, yarns
Frequent concern	Fibrillation from abrasion	Stretch or growth in knits	Weakness and shrinkage when wet

“Rayon” is an umbrella term used differently by different markets. In many labels and retail listings, rayon means viscose rayon, but it can be safer to check whether the detailed fibre content says viscose, modal, lyocell, cupro, or another regenerated cellulose type.

1. 1Make pulpWood is processed into purified cellulose pulp.
2. 2Dissolve cellulosePulp dissolves in an amine oxide solvent.
3. 3Extrude filamentsSolution passes through fine spinneret holes.
4. 4Regenerate fibreWater bath reforms solid cellulose filaments.
5. 5Wash and finishSolvent is removed; fibre is dried and processed.

The fibre is regenerated from cellulose after dissolution and spinning.

Modal is usually engineered for softness and strength and is common in lightweight jersey and intimate apparel. Conventional viscose is often very soft and drapey, but it may lose more strength when wet, so it needs more cautious handling during washing and sewing. Lyocell often combines drape with comparatively good wet strength, but it is not automatically more wrinkle-resistant or more durable in every construction.

How can you identify good lyocell fabric before buying?

You can identify a suitable lyocell fabric by checking the composition, structure, weight, opacity, recovery, and care instructions rather than trusting a soft feel alone. The same fibre can become a crisp woven, a slippery satin, a stable twill, or a stretchy jersey depending on yarn and construction.

1. Read the composition. Note the percentage of lyocell and every blend fibre. A 70% lyocell and 30% linen woven will crease and slub differently from 95% lyocell and 5% elastane jersey.
2. Check GSM and width. For garments, around 120–160 GSM is often light shirting or blouse territory, while 180–250 GSM can suit substantial jerseys, twills, or dresses. Construction changes these ranges, so use them as a starting point.
3. Look at opacity. Hold the fabric or a garment panel to light. Pale lightweight lyocell can need a facing, lining, double layer, or suitable undergarment.
4. Assess recovery. Gently stretch a knit across its width and release it. If it remains widened, it may grow during wear; elastane content, rib structure, and finishing matter here.
5. Inspect surface and colour. Look for rubbed pale areas, fine streaks, skewed grain, and uneven colour. These can be more visible on dark, smooth, fluid fabrics.
6. Read the care label. A washable fibre may still be made into a dry-clean-only garment because of its lining, interlining, coating, pleating, or garment construction.

For a wider view of weights, constructions, and label terms, use our fabric types and specs guide alongside the seller’s swatch or technical details.

How do you sew and care for lyocell fabric?

Lyocell sews cleanly when you control shifting, prevent seam stretching, and choose a needle that makes a small clean hole. The right method depends more on whether the fabric is a woven, a knit, or a slippery satin than on the word lyocell alone.

Prepare and cut accurately

Prewash the fabric using the method you expect to use for the finished garment, unless the supplier says otherwise. Dry it fully and let it relax flat before cutting. This reveals shrinkage, dye bleed, or surface changes before pattern pieces are involved.

For a fluid woven, lay tissue paper beneath the fabric if it slides on the cutting table. Use sharp shears or a fresh rotary blade and fine pins within the seam allowance. Test marking tools on an offcut: some chalks brush away easily, while pens can leave a visible line on smooth pale fabrics.

Set up the machine

Use a fresh sharp universal or microtex needle for most woven lyocell fabrics; select the size to suit the fabric weight and thread. A fine needle is preferable for lightweight fabric because a large needle can leave permanent holes. For knits, use a stretch or ballpoint needle if a universal needle causes skipped stitches.

Start with all-purpose polyester sewing thread and test on two layers. Sew a sample seam, press it, then pull it gently along and across the seam. If it puckers, lower the upper tension slightly, check that the presser foot is not dragging the top layer, and make sure the feed dogs are moving both layers evenly.

Press without damaging the surface

Use the iron setting recommended on the care label, press from the wrong side where practical, and use a press cloth on dark or lustrous fabric. Excess heat, pressure, or a dry iron can create a shine mark that is difficult to remove. Steam helps shape many lyocell wovens, but test first because finishes vary.

What practical details do beginners miss with lyocell?

The details beginners miss are fabric growth, seam stabilisation, and surface abrasion during construction. A lovely soft lyocell can behave very differently from stable cotton poplin even when both are woven and weigh the same.

• Stay-stitch curved edges early. Necklines, armholes, and bias-cut edges can stretch while you handle a fluid woven. Stay-stitch just inside the seam allowance before moving pieces around.
• Stabilise shoulder seams. In knit tops and slippery wovens, clear elastic, twill tape, or a narrow strip of stable lightweight fabric can prevent shoulders from lengthening. Match the stabiliser to the pattern instructions.
• Do not over-handle dark cloth. Repeated unpicking, basting with rough thread, or dragging seams across a machine bed can raise fibrils and leave lighter rubbed lines.
• Finish seam allowances. Lyocell staple-fibre wovens can fray. Use an overlock, zigzag, French seam, or bound seam appropriate to the fabric weight.
• Hang-test drapey garments. Skirts and bias-cut pieces may lengthen under their own weight. Hang the partly made garment for several hours, then level the hem before the final finish.
• Test interfacing first. Adhesive, heat, and pressure can change the face of smooth fabric. Fuse a small offcut and check for bubbling, strike-through, stiffness, and shine.

What are common lyocell mistakes and how do you fix them?

Most lyocell problems are preventable by testing scraps, reducing friction, and matching the sewing method to the fabric structure. Do not assume that every lyocell fabric needs the same needle, wash cycle, or interfacing because a fibre name cannot describe the entire fabric.

ProblemLikely causeFix

White rubbed streaksSurface fibrillationLower abrasion; use gentle washing

Seam puckeringUnstable fabric or thread tensionStabilise seam; reduce tension

Needle holesBlunt or oversized needleUse a fresh fine needle

Washed-down colourAbrasion or poor dye fastnessTurn inside out; check care label

Growth in knitLow recovery structureUse stabiliser or elastic blend

Most faults come from abrasion, unsuitable washing, or an unsuitable fabric construction.

Skipping the prewash

Skipping prewash can leave you with a garment that changes dimensions or surface feel on its first home wash. Wash the test piece or full cut length as the finished item will be washed, keeping dark colours separate until you know their dye behaviour. Follow the label and use a ventilated space if applying any chemical finish or stain treatment.

Using too much machine tension

High tension can pucker a fine woven and make seams look ropey after pressing. Stitch a 10–15 cm sample through the actual number of layers, including interfacing where relevant. Adjust one variable at a time: needle, thread, tension, stitch length, or presser-foot pressure if your machine provides that control.

Calling every pale mark a stain

A pale line on dark lyocell may be fibrillation or pressure shine rather than a removable stain. First inspect it from different angles and gently brush the surface. Avoid aggressive scrubbing, because more rubbing can make the difference worse; if care instructions allow it, a gentle wash may blend minor handling marks.

FAQ

The one thing to remember: lyocell is a regenerated cellulose fibre with a smooth, absorbent, drapey character, but the final fabric is defined just as much by its weight, structure, finishing, and blend. Buy and sew the fabric in front of you, not just the fibre name on its label.