What is acetate fabric? The FTC definition, triacetate and how it differs from rayon

Acetate is a manufactured fiber made from cellulose, the same plant material behind rayon, but chemically changed with acetic acid. Federal rules define it as "a manufactured fiber in which the fiber-forming substance is cellulose acetate." It is the shiny, drapey fabric in many linings, satin dresses and wedding gowns, and it behaves differently from viscose, cotton and polyester when you wash it.

What the federal definition says

The Federal Trade Commission's Textile Fiber Products Identification Act rules, at 16 CFR 303.7, set the generic names that go on a garment's fiber content line. We read the electronic version current as of October 20, 2026. Acetate is defined as a manufactured fiber whose fiber-forming substance is cellulose acetate. The same paragraph adds that where not less than 92 percent of the hydroxyl groups are acetylated, the term triacetate may be used as a generic description.

That detail matters on a label. Acetate and triacetate are close relatives, but the rule lets a maker use the second name only when the chemistry clears that 92 percent line. Wikipedia's cellulose acetate entry notes that diacetate and triacetate are often mistakenly treated as the same fiber, although their chemical identities differ.

How acetate differs from rayon

Both start as cellulose from wood pulp or cotton. Under the same rule, rayon is a manufactured fiber of regenerated cellulose, and acetate is cellulose that has been combined with acetic acid. Our guide to viscose fabric covers the regenerated route.

The practical differences, per Wikipedia's entry, are heat and water. Rayon resists heat, while acetate is prone to melting, and acetate loses strength when wet. The entry describes acetate as soluble in acetone and other organic solvents. It adds that acetate is hypoallergenic, resistant to mold and mildew, and usually does not shrink.

A short history of a silk substitute

The cellulose acetate chemistry dates to 1865, when French chemist Paul Schützenberger first reacted cellulose with acetic anhydride, per Wikipedia. The fiber story belongs to the Swiss brothers Camille and Henri Dreyfus.

According to Encyclopedia.com's company history of Celanese Corporation, the brothers were experimenting in a shed in their father's garden in Basel as early as 1904. By 1910 they had cellulose acetate lacquers and a nonflammable film base for motion pictures, and by 1913 they had produced high quality acetate yarn in the laboratory. World War I interrupted that work: the brothers made a flame-resistant acetate coating for airplane wings and fuselages, and a plant opened in Cumberland, Maryland in 1918 to make it for the U.S. military.

After the war, production of acetate yarn resumed. The same source says the British plant produced the first commercial cellulose acetate yarn in 1921, dubbed "artificial silk," and that its price of $9.00 per pound compared with silk's $20.00 per pound. The company name was changed to Celanese Corporation in 1927.

Where you will find acetate now

Wikipedia lists acetate in satins, brocades, knit fabrics and taffetas, where it adds luster and drape, and says its breathable nature suits it for linings. It adds that acetate is frequently used in wedding gowns and bridal attire because its sheen and smooth, satiny texture make it a good alternative to silk. It also says the fiber has been replaced in many applications by cheaper petroleum-based fibers such as nylon and polyester in recent decades.

The fiber also needs special handling. Wikipedia says acetate does not accept the dyes used for cotton and rayon and needs special dyes, which also allows cross-dyeing, and that it has poor abrasion resistance. Wikipedia describes the fiber as colorfast to perspiration and to dry cleaning.

Reading the label

The legal fiber name appears on the content line as acetate or triacetate, and the percentage must be shown. If a satin dress says 100 percent acetate, the maker is telling you it is cellulose acetate, not silk and not polyester. The care instructions are a separate legal requirement, explained in our guide to what clothing care labels mean. Follow them literally: given that acetate is prone to melting and dissolves in acetone, a hot iron is a real risk.

Names you may see on old labels and in history books

Wikipedia lists the trade names for acetate as Acele, Avisco, Celanese, Chromspun and Estron. It says acetate was formerly considered the same textile as rayon, and that the two are now required to be listed distinctly on garment labels, which is exactly what the federal rule does. The Encyclopedia.com history adds that the British government invited Camille Dreyfus to England in November 1914 to make the airplane coating, which became the start of British Celanese. In other words, the fiber most people associate with prom dresses began as a wartime aircraft varnish.

Hype check

The claim to watch for is that acetate is a natural or eco-friendly fiber because it begins with wood pulp. Wikipedia notes that it is made from wood pulp, a renewable resource, and can be composted, incinerated or carbonized. But "starts as wood pulp" is not the same as a clean product: the fiber is chemically modified, and no source we opened measures its environmental footprint against alternatives. A claim of sustainability needs a certification or a number behind it.

Our take

Acetate is a good fabric for a job it was built to do: a lustrous, drapey, inexpensive stand-in for silk in linings and occasion wear. Buy it for the look, not for durability, wash it gently or dry clean it as the label says, and be skeptical of any page that sells it as a miracle eco fiber. When a tag says acetate, you now know exactly what the law says that means.