What Is Modal Fabric? The Beech-Wood Fiber That Started as Potato-Bag Tape
C.B. ShawShare
What is modal fabric? Modal is a soft fiber made from wood pulp, usually beech. The Textile Exchange glossary calls it a “second generation regenerated cellulosic fiber” and a type of rayon. That means it is not natural in the way cotton is: wood is dissolved, processed chemically and spun back into fiber. Modal is a cousin of viscose with higher strength when wet. This guide covers how it differs from viscose and lyocell, where it came from (including a surprising first use), and which sustainability claims are company statements rather than proof.
What modal is
Fibre2Fashion, a trade site, describes modal as a variety of viscose rayon with high tenacity (strength) and high wet modulus (it holds its shape when wet), made from beech pulp. It notes modal is a distinct category in international fiber standards because of that higher wet modulus. Lenzing's TENCEL-branded Modal, per Textile Exchange, is made from beech wood from PEFC-certified European forests (PEFC is a forest-certification program). Whether other makers sell generic modal we could not verify.
On the legal side, US federal fiber rules define rayon as regenerated cellulose and lyocell separately as solvent-spun cellulose with no chemical intermediates. The page we read showed no separate “modal” entry, so we can only say modal legally sits in the rayon family. We could not confirm a separate federal name for it. Compare it with its relatives in what viscose is.
A history other pages leave out
Textile Exchange says high-wet-modulus fibers were first developed in Japan in 1951, and that Lenzing began selling Modal in 1964, adopting an integrated pulp-to-fiber process in 1977. Nonwovens Industry, covering Lenzing's 50th anniversary of modal in 2015, adds that in the early 1960s Lenzing researchers sought a cotton-like fiber stronger than viscose. The original name was “Hochmodul 333,” dropped in the 1970s. The first MicroModal was made in the 1990s. And here's the fact most pages skip: one early use was tape for closing potato bags. Dates conflict a little (1964 versus 50 years in 2015), so we say development in the early 1960s and sales from about 1964 to 1965. Lenzing says it was the only maker for decades, which is a company statement.
How it behaves
- Soft and strong. Described as softer and stronger than ordinary viscose, with a cotton-like feel (Lenzing's own release, so treat “unparalleled softness” as marketing).
- Pilling. Fibre2Fashion says 100 percent modal tends to pill because of its long fibers, which conflicts with marketing that says it resists pilling. Unproven either way (see why shirts pill).
- Cost and care. It costs more than viscose and cotton, and pure modal needs ironing (Fibre2Fashion). We didn't fetch modal care instructions, so follow the garment's label.
- Blends. Often blended with cotton, wool and spandex, as a cotton replacement. We found no percentages.
We found no independent test data on shrink resistance, drape or moisture absorption, so we won't make claims about them.
Is modal sustainable?
It's complicated, and the honest answer is “it depends on the maker.” Lenzing claims up to 95 percent of chemicals are recycled and calls production “CO2-neutral” because it is integrated with cellulose recovery. We found no independent proof of “CO2-neutral,” so it stays a company claim. The 1977 integrated process is a checkable historical fact. The campaign group Canopy ranked viscose producers in its 2018 Hot Button report, placing Lenzing, Birla Cellulose and ENKA in its “light green shirt” tier on forest sourcing risk. That report doesn't rate modal specifically, and it's old, so current rankings may differ. The Changing Markets Foundation's 2020 report “Dirty Fashion: Crunch Time” said Lenzing's Lenzing and Nanjing sites already operated in line with EU best-available-techniques standards, but criticized limited transparency; the report says it is not a ranking. Modal also needs more energy than natural fibers, per Fibre2Fashion. We could not verify the “beech is waste wood” claim.
Modal myths, graded
- “Modal is natural.” False. It is regenerated cellulose.
- “Modal is the same as viscose.” Partly. It's in the viscose family with a different spec.
- “Modal doesn't pill.” Unproven.
- “Modal is CO2-neutral.” Unproven. It is a company claim.
- “Modal comes from ancient forests.” False for Lenzing's PEFC-certified European beech. Unverified for other producers.
- “Lenzing invented modal.” Partly. High-wet-modulus fibers were developed in Japan in 1951, and Lenzing sold its version from about 1964.
Questions people ask
What is modal fabric made of?
Wood pulp, usually beech, processed into a regenerated cellulose fiber.
Is modal natural or synthetic?
Neither exactly. It starts from wood but is chemically processed, so it is a regenerated cellulosic fiber.
Is modal the same as viscose?
It's a viscose-family fiber with higher wet strength.
Is modal the same as rayon?
Modal is a type of rayon, per Textile Exchange.
What is the difference between modal and lyocell?
Lyocell is solvent-spun with no chemical intermediates under US rules. Modal is made in the viscose family of processes.
Is modal soft?
It is described as soft and cotton-like, but the strongest softness claims come from the maker.
Does modal pill?
One trade source says 100 percent modal tends to pill, while marketing says otherwise. Unproven.
Who invented modal?
High-wet-modulus fibers were developed in Japan in 1951, and Lenzing began selling Modal in 1964.
What was modal first used for?
Per Lenzing, one early use was tape for closing potato bags.
What is MicroModal?
A finer modal fiber first produced at Lenzing in the 1990s.
Is modal sustainable?
It depends on the maker. Lenzing's claims, such as CO2-neutral, are company statements without independent proof in what we found.
From Innocently Insane
Fiber content is listed on every product page.
