Vegan
How we decideCupro is vegan. Short linters left on the cotton seed after ginning are dissolved in a copper-ammonia solution and respun, which makes it a plant fiber with a chemical detour. Asahi Kasei's Bemberg dominates the market, and it lines a lot of tailoring where silk once did.
- Origin
- Plant-derived — made from cotton linter (the very short fibers left on cotton seeds after the longer fibers are removed), dissolved in a copper-ammonia solution and regenerated into fiber.
- Common Uses
- Garment linings, blouses, dresses. Often used as a silk substitute in luxury linings.
- Durability
- Good. Drapes beautifully, soft, breathable, and hypoallergenic. Biodegradable at end of life.
Environmental Impact
Medium Environmental ImpactUses cotton linter waste (a byproduct), which is positive. However, the copper-ammonia dissolution process requires careful management of copper waste. Bemberg (the leading brand, produced by Asahi Kasei, Japan) claims a closed-loop process recovering most chemicals and metals used.
Editorial Notes
Cupro is marketed as a vegan silk alternative with superior breathability compared to synthetic linings. It is often the lining fabric in luxury fashion garments. Bemberg is the dominant commercial producer. Relatively niche but gaining attention as a vegan alternative to silk linings in tailored garments.
In depth
How cupro is made
Cupro is a regenerated cellulose fiber, part of the same broad family as viscose rayon, modal, and lyocell. The raw material is cotton linter. Those are the short, fuzzy fibers that remain attached to cotton seeds after ginning removes the longer spinnable ones. Linter is too short to spin into yarn. Cottonseed processing otherwise leaves it a low-value byproduct.
To make cupro, the linter cellulose is dissolved in a cuprammonium solution of copper salts and ammonia. The resulting viscous liquid is extruded through spinnerets into a bath. There the cellulose regenerates as a continuous filament. The copper and ammonia are then removed from the fiber and, in modern closed-loop plants, largely recovered and reused.
Because the process involves copper-containing effluent, production has become concentrated in a small number of facilities that can manage the chemistry. Asahi Kasei in Japan makes the Bemberg brand. The company is the dominant commercial manufacturer. Cupro production has become rare elsewhere, with the effluent and the cost of treating it often cited as a factor. No animal inputs are involved at any stage of the standard process.
How to spot it on labels
On garment fiber-content labels, this material may appear under several names. In the European Union, "cupro" is a recognized generic fiber name under textile labeling regulation, so EU-market garments typically list it explicitly. In the United States, it may appear as "cupro" or "cuprammonium rayon." It may also sit under the broader term "rayon," since cupro belongs to that family of regenerated cellulose fibers.
"Bemberg" is a trademark of Asahi Kasei, not a generic fiber name, but it is widely used in tailoring and menswear marketing. A suit with a "Bemberg lining" contains cupro. Marketing terms such as "cupro silk" or "vegan silk" also usually refer to this fiber, though "vegan silk" is an unregulated phrase that can also describe polyester, viscose, or lyocell fabrics.
For vegan shoppers the point is reassurance: despite the silk-like name and hand feel, cupro contains no silk. If a label lists cupro alongside other fibers, check the remaining percentages. Linings and blends can still pair it with wool or silk in the same garment.
How cupro compares with silk and other alternatives
Cupro is most often positioned as a substitute for silk, particularly in linings, blouses, slip dresses, and other drapey garments. Like silk, it is smooth, lightweight, and breathable, with good moisture absorption. Those properties come from its cellulose base. Unlike polyester lining fabrics, it does not tend to trap heat or build up static to the same degree, which is why tailors have long favored cupro linings in suits and jackets.
Compared with other plant-based silk alternatives, cupro sits between viscose and lyocell. Viscose is cheaper and more widely available. Its conventional production uses carbon disulfide. That solvent carries well-documented occupational hazards. Lyocell (often sold as Tencel) uses a closed-loop organic solvent process generally regarded as cleaner. Cupro's copper-ammonia chemistry requires careful effluent management, though the leading producer operates recovery systems.
In practical terms, cupro is best known for its fluid, silk-like drape. It sells as a premium fabric, typically costing more than standard viscose. All three are vegan, biodegradable in fiber form, and derived from plant cellulose.
Where you will encounter it
The single most common place to find cupro is inside a garment. In tailored clothing it is the standard lining fabric. Suits, blazers, coats, and formal dresses use it. Its slipperiness helps garments glide over other layers, and its breathability prevents the clammy feel associated with polyester linings. Many wearers own cupro-lined garments without knowing it, since linings receive less attention than shell fabrics.
As an outer fabric, cupro appears in blouses, slip dresses, wide-leg trousers, and scarves, particularly from brands marketing sustainable or vegan collections. In these applications it is often blended with viscose, cotton, or elastane. For vegans, cupro linings are a point in a garment's favor.
High-end tailoring historically used silk or silk-blend linings, and cupro is among the materials that have replaced them. Older secondhand and vintage tailoring is more likely to carry genuine silk linings, and lining content is not always labeled. With unlabeled vintage pieces, a burn test or professional assessment is the only way to be certain.
Frequently asked questions
Is cupro vegan?
Yes, cupro is vegan. The fiber comes from cotton linter, a plant byproduct of cottonseed processing, regenerated through a copper-ammonia chemical process. No animal-derived inputs are used in its standard production, and it is widely marketed as a vegan alternative to silk.
Is cupro the same as silk?
No. Cupro is a plant-based regenerated cellulose fiber, while silk is an animal protein fiber produced by silkworms. Cupro mimics silk's drape, sheen, and breathability, which is why it is often called "vegan silk" or "cupro silk," but the two materials are chemically and ethically distinct.
What is Bemberg fabric?
Bemberg is the brand name for cupro produced by Asahi Kasei of Japan. Asahi Kasei is the dominant commercial manufacturer of the fiber. A "Bemberg lining" in a suit or jacket means a cupro lining. Tailoring often uses the brand name generically, much as Tencel is used for lyocell.
Is cupro the same as rayon or viscose?
Cupro belongs to the rayon family but is not the same as viscose. Both are regenerated cellulose fibers. Viscose is made from wood pulp using a carbon disulfide process, and cupro from cotton linter using a copper-ammonia process. In the US, cupro may sometimes be labeled simply as rayon.
Is cupro sustainable?
Cupro has a mixed environmental profile. On the positive side, it uses cotton linter, a byproduct that would otherwise be low-value waste, and the fiber is biodegradable. On the negative side, the copper-ammonia process produces effluent that requires careful treatment; the leading producer states that it operates closed-loop recovery of chemicals and metals.
What can I use instead of silk lining?
Cupro is the most established vegan replacement for silk lining. Much modern tailoring already uses it as standard. Other options include viscose, lyocell (Tencel), and polyester linings. Cupro and lyocell are generally considered the closest to silk in breathability and drape, while polyester is cheaper but less breathable.