Polyester fiber

The group of polyester fibers represents the largest share of synthetically produced fibers worldwide. Although many different polymers can be assigned to this group, polyethylene terephthalate (PET) makes up by far the largest proportion of this group. As the name suggests, polyesters are formed by a polycondensation of carboxylic acid derivatives and alcohols to form ester groups. The great success of polyester fibers is due to their very good processability, the wide range of usable properties and the comparatively low production costs.  The mechanical fiber properties such as thermal and dimensional stability, strength, bulkiness and fineness can be controlled very well over a wide range by the process conditions during fiber production. Fiber production is mainly carried out using the melt spinning process.

Pros and cons
Polyester fiber Properties


  • Good price-performance ratio
  • Chemical resistance to solvents and lubricants
  • Hydrolytic resistance in contact with weak acids and alkalis
  • Relatively high melting point and heat resistance
  • Very good recyclability, even in applications with food contact


  • Low resistance to high pH values, especially to strong bases

Polyester fiber
Manufacturing process

Polyesters are produced by polymerization (more precisely polycondensation) between dicarboxylic acids and aliphatic dihydroxy compounds. In the case of polyethylene terephthalate (PET), which is produced in large quantities, this involves terephthalic acid and ethylene glycol. The water produced during the reaction must be removed in order to achieve a chain structure in a specific molecular weight range. In a further step, fibers are produced by means of a melt spinning process. Filaments are formed from the polyester melt at spinnerets, which are further oriented, crystallized and cut in downstream process steps.

Order our Polyester fiber Sample box

Contact our fibre experts and discover our extensive STW sample box with numerous raw material samples, personally tailored to your needs and requirements.

Order Polyester fiber sample box

technology and
quality of the fibre

State-of-the-art laboratory facilities, quality management according to ISO 9001:2015, energy management according to ISO 50001:2018 and last but not least the high demands on our own work ensure the high quality standards of our Polyester fiber. See for yourself.

If you want to know more about the technology and quality of our Polyester fiber If you want to know, just get in touch with us. We would be happy to advise you comprehensively and help you with our know-how.

You are looking for the perfect Polyester fiber for your application or have an exact requirement profile, which the used Polyester fiber must fulfill?

Then you are exactly right, as a technology leader in the field of fibre development and production, we offer you individual solutions and manufacturing processes that ensure constant and reproducible fibre quality.



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