Trevira is a series of brands of functional polyester textiles, with properties built into the polyester mass itself, manufactured by Indorama Ventures. Trevira CS (Trevira Comfort and Safety) is the best-known flame-retardant polyester. Unlike fabrics that have been treated with flame retardants, the built-in protection is in the chemical structure of the Trevira fibre. Fire safety is not compromised by wear, age, or washing, unlike surface treatments. The chemicals added during manufacture cause the fibre to melt quickly when exposed to fire, causing the material to deviate from the flames and never really ignite. However, they do emit a small amount of toxic smoke.
Textile manufacturers can use Trevira fibres and yarns as raw materials to produce their own functional textiles. They purchase fibres such as Trevira CS or Trevira Bioactive (with antimicrobial properties) to manufacture knitted or woven fabrics tailored to different applications. The fabrics can then be dyed, printed, or finished to achieve the desired aesthetic or functional properties without compromising the built-in functions. For example, to use the Trevira CS label, the end products must be tested and certified to ensure that they meet Trevira’s strict fire safety requirements.
Trevira CS fibres are used in interior textiles and are available in many different colours and forms, from sheer thin curtains to coarser, corduroy-like upholstery fabrics. They are mainly used in public, but also in private environments with high demands on fire safety and durability.
Trevira Bioactive fibres are used in clothing such as workwear, uniforms, sportswear, and undergarments. During the manufacturing process, silver-based antimicrobial substances are incorporated into the fibre, providing long-lasting protection against bacteria and odours. Healthcare professionals use them to minimise bacterial growth and ensure hygiene in hospitals and clinics. They are also used in sportswear to prevent odours caused by bacterial growth, especially in humid environments. These fibres are also available in the Trevira CS Bioactive variant, which combines flame retardancy with antimicrobial properties.
Challenges & Environmental Impact
Trevira fibres, like other polyester-based textiles, pose challenges because they are derived from fossil fuel . The extraction and processing of crude oil contribute to greenhouse gas emissions and the depletion of natural resources.
The company behind Trevira has integrated recycled PET into its fibre production. However, the fundamental challenges remain, including dependence on fossil fuels, microplastic pollution, and the fact that they are not biodegradable. The added chemicals also make them difficult to recycle.
According to the manufacturers, the silver-based antimicrobial substances in Trevira Bioactive do not leach out during washing. However, the nanoparticles are integrated into the fibre, and it is a well-known problem that polyester releases microplastics. Silver particles, especially in nanoparticle form, can accumulate in water systems and have toxic effects on aquatic organisms.
Sources
Trevira – Built-in Protection Against bacteria and micro-organisms 
Astrid – Flamsäkerhet och tyger
Ludvig Svensson – Trevira CS Online Library – Investigation on the Flammability & Washing Durability
Sew What – Avora, Trevira, and just plain old polyester
Eurekamag – Behaviors of fabrics and blends from Trevira CS
Februari 2025, TÄNKOM | Revised October 2025, RETHINK
