# Man-Made Cellulosics: Sourcing Viscose, Modal and Lyocell Responsibly | SSL Newsroom > Source: https://surajmal.com/blog/2026/07/man-made-cellulosics-viscose-modal-lyocell [SSL Newsroom](/blog) Sustainability # Man-Made Cellulosics: Sourcing Viscose, Modal and Lyocell Responsibly Kolkata · 27 JULY 2026 ·By Surajmal Editorial Team·7 min read Published 27 July 2026 Man-made cellulosic fibres sit in an awkward place in most sourcing conversations. They are not natural fibres in the way cotton or wool are, and they are not synthetics in the way polyester is. They are made from wood, which sounds reassuring, and then dissolved in chemistry that most buyers never see, which is where the real questions live. Viscose (also called rayon), modal, lyocell, and the smaller cupro and acetate lines together form one of the fastest-growing fibre categories in apparel, valued for drape, softness, moisture handling, and a silk-like hand at a fraction of silk's cost. The problem for a buyer is that the sustainability profile of these fibres has almost nothing to do with the fabric you can feel and almost everything to do with two things you cannot see: where the wood pulp came from, and how it was turned into fibre. Two lyocell fabrics with identical specifications can have completely different footprints depending on the forest and the mill behind them. Here the specification sheet tells you very little and the chain of custody tells you almost everything. ## What man-made cellulosics actually are Man-made cellulosic fibres, usually abbreviated MMCF, start as cellulose extracted from wood (typically eucalyptus, beech, pine, or bamboo). The wood is broken into dissolving pulp, dissolved into a viscous solution, then extruded through spinnerets and regenerated back into solid cellulose fibre, which is why these are called regenerated fibres. The raw material is renewable and biodegradable, a genuine advantage over petroleum-based synthetics, but the dissolving-and-regenerating step is chemically intensive, and that is where the environmental risk concentrates. The category also keeps growing: as brands look to reduce dependence on both cotton (land and water intensive) and virgin polyester (fossil-based), MMCFs are the obvious middle path, which is exactly why the upstream risks deserve attention rather than assumption. ## Viscose, modal and lyocell: the practical differences The three fibres a buyer meets most often share a raw material but differ in the manufacturing chemistry, and that difference drives both performance and footprint. **Viscose (rayon)** is the original and still the most common. It is made by the viscose process, which uses carbon disulphide and caustic soda to dissolve the cellulose. It has excellent drape and a soft hand, but conventional viscose manufacturing is the most chemically intensive of the three and, done badly, the most polluting. It is also the weakest when wet. **Modal** is a viscose variant made from beech pulp using a modified process that produces a stronger, finer fibre. It holds up better to washing and abrasion than standard viscose and keeps its softness over more wash cycles, which is why it appears so often in underwear, loungewear and jersey. Chemically it sits closer to viscose than to lyocell. **Lyocell** uses a different process entirely. Instead of the viscose chemistry, it dissolves cellulose in an organic solvent (amine oxide) that is recovered and reused in a closed loop, with most of the solvent recycled back into the process rather than discharged. That closed-loop chemistry makes lyocell generally the lowest-impact of the three at the manufacturing stage, and it is strong both wet and dry with good moisture management. The best-known branded lyocell is TENCEL from Lenzing, and much branded lyocell carries producer-level environmental commitments alongside the fibre. Fibre Process Relative strength Manufacturing footprint Viscose / rayon Viscose process (carbon disulphide) Lower, weak when wet Highest risk if uncontrolled Modal Modified viscose, beech pulp Higher, better wash durability Moderate Lyocell Closed-loop solvent (amine oxide) Highest, strong wet and dry Lowest of the three None of this makes viscose unacceptable or lyocell automatically virtuous. A well-run viscose mill can be a sound choice, and lyocell made from pulp out of a threatened forest is not: the process type sets the baseline, but the specific mill and forest decide the outcome. ## The forest risk The first risk is where the wood pulp comes from. Because MMCFs are made from trees, poorly governed sourcing can pull pulp from ancient and endangered forests, or contribute to deforestation of high-conservation-value woodland. The garment carries no visible trace of this, so the risk has to be managed through the supply chain rather than tested for in the lab. The most useful reference point is CanopyStyle, an initiative that works with brands and fibre producers to keep endangered and ancient forests out of MMCF supply chains. Canopy publishes the Hot Button ranking, which assesses the major dissolving-pulp and fibre producers on the risk that their sourcing touches endangered forests. A producer's Hot Button standing is a fast, credible read on forest risk, and asking your supplier which ranked producer their fibre comes from is a fair, answerable question. This is the same sub-tier discipline that closing the wider [origin-mapping gap](/blog/2026/05/traceability-gap) demands: the risk lives several tiers up from the mill you buy from. ## The manufacturing pollution risk The second risk is the chemistry. Conventional viscose production uses hazardous chemicals, and mills without proper controls can discharge contaminated wastewater and emit sulphur compounds and carbon disulphide, with real consequences for the surrounding water and the workers. This is a process-control problem, not an inherent property of the fibre: the same viscose can be made cleanly or filthily depending on the plant. The framework to reference is ZDHC, whose Roadmap to Zero programme has published specific guidance for MMCF manufacturers covering chemical inputs, emissions and wastewater. A responsible viscose or modal mill should be able to speak to closed-loop chemical recovery and ZDHC-aligned wastewater performance. Treating those environmental claims with the same scrutiny you would apply to any sustainability statement, and [asking for the evidence behind them](/blog/2025/05/verify-sustainability-claims), keeps the category honest. ## Certifications and assurances to ask for Because the risks are upstream and invisible in the fabric, assurance comes through documentation. The ones worth asking for: **Chain-of-custody certification for the wood**, through FSC or PEFC, evidences that the pulp comes from responsibly managed forests rather than uncontrolled sources. This is the most direct answer to the forest risk. **Branded, closed-loop lyocell** such as TENCEL from Lenzing carries producer-level environmental commitments and traceability that generic, unbranded fibre usually does not; specifying it means buying the assurance programme as much as the fibre. **EU Ecolabel** and comparable eco-labels set thresholds on the chemistry and emissions of production, a useful shorthand where available. **ZDHC MMCF guidance** conformance speaks to the wastewater and chemical management of the plant itself. These sit alongside the broader chemical certifications a buyer already works with; for how MMCFs fit into that wider picture of restricted substances, our [guide to REACH, OEKO-TEX and GOTS](/blog/2024/10/reach-oeko-tex-gots-guide) covers the ground. The same maturity that moved [recycled fibres into the mainstream](/blog/2025/08/recycled-fibres-mainstream) is now reaching next-generation cellulosics made from recycled textile and agricultural waste rather than virgin wood, worth watching as they scale. ## Traceability and what regulation will require The direction of travel is toward proving fibre origin, not just asserting it. The [EU Digital Product Passport](/blog/2026/05/eu-digital-product-passport-apparel), rolling out across apparel over the coming years, is built around exactly this kind of upstream data: fibre composition, origin, and environmental attributes attached to the product and available down the chain. For MMCFs, whose entire risk profile lives in the forest and the mill, the pulp source and manufacturing chemistry are precisely the data points buyers will be required to hold and pass on. Building that traceability now, rather than reconstructing it under a compliance deadline, is the cheaper path. ## A sourcing checklist for specifying MMCF When specifying viscose, modal or lyocell, a buyer can cover most of the risk with a short set of questions: - **Name the fibre precisely.** Specify viscose, modal or lyocell rather than a generic "rayon", and prefer lyocell or well-managed modal where performance allows. - **Identify the fibre producer.** Ask which mill and which brand the fibre comes from, and check the producer's Hot Button ranking for forest risk. - **Require forest chain of custody.** Ask for FSC or PEFC certification on the dissolving pulp. - **Ask about the chemistry.** For viscose and modal, ask about closed-loop chemical recovery and ZDHC-aligned wastewater management; for lyocell, confirm the closed-loop solvent process. - **Prefer branded, assured fibre** such as TENCEL where the assurance programme and traceability matter to your claims. - **Capture the traceability data now** (pulp origin, producer, certifications) so it is ready for Digital Product Passport requirements rather than assembled in a panic later. The finished fabric feels the same either way. The difference between a responsible MMCF and a reckless one is entirely in the paperwork behind it, which is why the buyer who asks for that paperwork upfront ends up with the fibre they thought they were buying. 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Every article is reviewed by practitioners who source, sample, and ship the products they write about. On this page - [What man-made cellulosics actually are](#what-man-made-cellulosics-actually-are) - [Viscose, modal and lyocell: the practical differences](#viscose-modal-and-lyocell-the-practical-differences) - [The forest risk](#the-forest-risk) - [The manufacturing pollution risk](#the-manufacturing-pollution-risk) - [Certifications and assurances to ask for](#certifications-and-assurances-to-ask-for) - [Traceability and what regulation will require](#traceability-and-what-regulation-will-require) - [A sourcing checklist for specifying MMCF](#a-sourcing-checklist-for-specifying-mmcf) More from the newsroom - [Sustainability · 7 min The Traceability Gap: Why Supply Chain Claims Outrun Evidence](/blog/2026/05/traceability-gap) - [Sustainability · 7 min Recycled Fibres Go Mainstream: What Buyers Need to Know](/blog/2025/08/recycled-fibres-mainstream) - [Sustainability · 7 min How to Verify Sustainability Claims in Your Supply Chain](/blog/2025/05/verify-sustainability-claims) START A CONVERSATION ## Ready to source with _confidence?_ Send a brief and we'll reply within 24 hours, with a first sample in 4 to 10 days. 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