Triexta Fiber

(Polytrimethylene Terephthalate)


Polytrimethylene Terephthalate (PTT) was first synthezided and patented in 1941. The fiber has been officially recognized by the U.S. Federal Trade Commission and named Triexta. It is a thermoplastic polyester fiber that can be spun into yarns that are used extensively in the carpet industry. The fiber is composed of terepthalic acid and 1,3-propanediol (PTT). Polyester fabrics and yarns made from this fiber are strong, very elastic (springs back into shape), and have high abrasion and wrinkle resistance.

Triexta combines some of the best properties of Nylon with those of conventional polyester (PET). For example, Triexta has the excellent elastic recovery1 and resilience of Nylon and its tensile strength is only slightly lower than that of PET fibers whereas its elongation at breaking point is slightly higher. However, PTT and PET are not as strong as nylon fibers.

Triexta (PTT) has many advantages over conventional polyester. For example, the fiber is much softer (wool-like feel), more resilient and holds dies much better. The fiber also has good stain-resistance and can be blended with natural and other man-made fibers.

Polyester Fiber Properties

Tensile Strength (Tenacity) Good
Wear Resistance Good
Absorbency Poor
Static Resistance Poor
Heat Resistance Fair to Good
Wrinkle Resistance Excellent
Resistance to Sunlight Good
Elasticity Excellent
Resilience Excellent


COMMERCIAL Polyester Fibers

The main manufacturer of Triexta polyester fibers is DuPont. DuPont's Sorona®  fiber is produced with up to 37% by weight of renewably-sourced, plant-based raw material.2



Triexta fibers are used in the apparel and home furnishing industry for many textile products like high-quality carpets, upholstery, sheets and pillow cases. The most important application of Triexta fibers is carpets. It has been shown that residential carpets made from Triexta fibers significantly outperform conventional polyester carpests in resilience and durability. The automotive industry is using Triexta fibers in mats and upholstery for autimotive interiors, and the clothing industry is using the fiber for high-quality swimwear and active wear.



  1. Triexta fibers have a higher recovery from 20 percent elongation (almost 90 percent) then to Nylon 66, PBT, and PET fibers.
  2. The fiber was not produced on a large scale until the 1990s when Shell developed a low-cost method for the production of pure 1,3 propanediol (PDO).

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