Lyocell vs Viscose: Which Sustainable Yarn Is Right for Your Brand?

Both lyocell and viscose are regenerated cellulose fibers made from plant material, but they differ significantly in production process, environmental impact, and textile performance. Here's a comprehensive comparison to help you choose the right fiber for your products.

Production Process Comparison

Viscose (Rayon)

Viscose is the oldest regenerated cellulose fiber, commercialized in the early 1900s. The production process:

1. Wood pulp (usually from eucalyptus, bamboo, or pine) is dissolved in sodium hydroxide
2. The resulting alkali cellulose is treated with carbon disulfide (CS₂) — a toxic chemical
3. The solution is extruded through spinnerets into an acid bath, regenerating cellulose fibers
4. Approximately 30-50% of the carbon disulfide is recovered and reused

Lyocell (Tencel™)

Lyocell was developed in the 1990s as a more environmentally friendly alternative to viscose:

1. Wood pulp (typically from sustainably managed eucalyptus plantations) is dissolved in a non-toxic organic solvent called NMMO (N-Methylmorpholine N-oxide)
2. The solution is extruded through spinnerets into a water bath
3. The key advantage: 99.5% of the NMMO solvent is recovered and recycled in a closed-loop system
4. Water usage is significantly lower than viscose production

Head-to-Head Comparison

Property	Viscose	Lyocell
Raw material	Wood pulp	Wood pulp (often certified)
Solvent	Carbon disulfide (toxic)	NMMO (non-toxic)
Solvent recovery	30-50%	99.5%
Water usage	High	Low
Biodegradable	Yes	Yes
Strength (dry)	Moderate	High
Strength (wet)	Low (weakens significantly)	Good (retains strength)
Hand feel	Soft, silky	Soft, smooth, slightly cooler
Drape	Good	Excellent
Pilling tendency	Moderate	Low
Color brilliance	Very good	Good
Price (per kg)	Lower	Higher

Environmental Impact: The Deciding Factor

For brands positioning themselves as sustainable, the environmental difference is significant:

• Chemical pollution: Conventional viscose production can pollute waterways with carbon disulfide and other chemicals. Lyocell's closed-loop process eliminates this problem.
• Land use: Lyocell typically uses eucalyptus from certified, fast-growing plantations that don't require irrigation or pesticides. Viscose may use pulp from old-growth forests in some cases.
• Energy consumption: Lyocell production uses less energy per kg of fiber produced.
• End of life: Both fibers are biodegradable, but lyocell breaks down more quickly in natural conditions.

Important caveat: Not all lyocell is created equal. Look for Tencel™ branded lyocell (by Lenzing AG) or other producers that can demonstrate certified sustainable sourcing. Generic lyocell from uncertified sources may not offer the same environmental benefits.

When to Choose Viscose

Viscose remains the better choice when:

• Budget is a primary constraint — viscose is 15-25% cheaper than lyocell
• Vibrant color is important — viscose takes dye exceptionally well
• The brand isn't positioned as eco-focused — viscose is still a natural-based fiber
• Blending with cotton — cotton-viscose blends are popular and cost-effective

When to Choose Lyocell

• Sustainability is a brand value — lyocell has the strongest environmental credentials
• Higher wet strength is needed — activewear, swimwear, or fabrics exposed to moisture
• Premium positioning — lyocell commands a higher perceived value
• Blending with cotton or modal — cotton-lyocell blends offer an excellent balance

The Middle Ground: Viscose-Lyocell Blend

For buyers who want a balance between cost and sustainability, viscose-lyocell blended yarn offers an attractive middle ground. This blend combines:

• Viscose's lower cost and excellent dyeability
• Lyocell's higher strength and better environmental profile
• A cost that sits between pure viscose and pure lyocell

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