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Nereus® Bio Test Results
Verified performance. Transparent documentation.
At Fiberpartner, we believe innovation must be backed by evidence. That is why Nereus® Bio is continuously evaluated through independent laboratory testing to document its biodegradation performance under controlled conditions.
Our commitment is simple: provide transparent, up-to-date data you can rely on.
- Landfill Simulation D5511
- Marine Simulation D6691
- Municipal Sewage Sludge Simulation D5210
- Soil Simulation D5988
Scientifically documented biodegradation
Nereus® Bio has been examined across a wide range of polyester fiber constructions, including solid, hollow, and bicomponent fibers. Testing has been conducted under recognised ASTM standards to simulate environments such as: Landfill, Ocean water, Wastewater, and Soil.
Under controlled microbial conditions, Nereus® Bio is engineered to break down into natural components including water, CO₂, methane, biomass and humus. Results reflect laboratory conditions and may vary in real-world environments.
All data presented here is based on third-party, independent testing.
Pre-production verification
Before initiating full production, a sample is sent to a 3rd party laboratory for an accelerated test that measures the initial behaviour of the fiber.
After the QC test for up to 90 days, the performance is verified and the staple fibers are approved.
Performance without compromise
Nereus® Bio maintains the same characteristics and performance as regular PET fibers, including:
- Strong performance and durability
- Same output and whiteness
- No special care required during usage or storage
- Easy integration into existing production
- Compatibility with chemical recycling
Biodegradation does not occur during normal product usage. It only takes place in environments with naturally occurring microbes, such as landfills, oceans, or wastewater.
Latest update
The test information presented here reflects the most recent validated data.
Updated January 2026
Disclaimer
In order to avoid greenwashing claims, any description of the biodegradability of PrimaLoft® Bio™ must be accompanied by the following disclaimer. The disclaimer is continuously updated with new test results.
*Biodegradable
93.8% biodegradation in 646 days under ASTM D5511 conditions (landfill environment)
88.5% biodegradation in 2313 days under ASTM D6691 conditions (marine/ocean environment)
85.5% biodegradation in 1213 days under ASTM D5210 conditions (wastewater environment)
88.1% biodegradation in 973 days under ASTM D5988 conditions (Soil environment)
The stated rate and extent of degradation does not mean that the product will continue to degrade
Is PrimaLoft® Bio™ available today?
YES! PrimaLoft® Bio™ is already available globally, both virgin and recycled, through a controlled supply chain. There is full capacity and delivery guarantee.
How can we be sure it works on our set-up?
Before initiating full production, a sample is sent to 3rd party lab for an accelerated test that measures the initial behavior of the fiber. After the QC test for up to 90 days, we can verify that the technology works, and the staple fibers are approved.
Who else is using PrimaLoft® Bio™?
Several well-known outdoor brands have implemented PrimaLoft® Bio™ in fabrics and insulation, including Jack Wolfskin, Maloja, Katmandu, 4F and Icebug.
Can PrimaLoft® Bio™ be used for my products?
Yes, it can be added to any polyester application, including wadding, filtration, automotive, acoustics, medical, and hygiene products.
Will PrimaLoft® Bio™ biodegrade on shelves?
No, it only biodegrades in environments with naturally occurring microbes, such as landfills, oceans, and wastewater. PrimaLoft® Bio™ comes in normal bales and has a normal shelf life with no need for special care or treatment during storage and transportation.
Is PrimaLoft® Bio™ scalable?
Yes, we are already commercial with BICO (low melting fibers), solid, and hollow fibers – and have no capacity issues.
Does PrimaLoft® Bio™ require a change in production set-up?
No, PrimaLoft® Bio™ has the same characteristics and performance as regular PET fibers with the same output and same whiteness, and it blends well with natural fibers.
Will PrimaLoft® Bio™ biodegrade during usage?
No. The fibers do not biodegrade during usage or storage. Biodegradation occurs only when fibers enter environments with active microbes, such as landfills or oceans.
How does PrimaLoft® Bio™ work with EU’s single-use plastic directive?
Polyester is a polymer, and therefore the end product could be considered as a “plastic”. This means that different measures from Single-Use Plastic Directive can be applied to your product.
Can PrimaLoft® Bio™ be recycled?
Yes, it supports chemical recycling with up to 95% yield, as documented in independent tests.
How does PrimaLoft® Bio™ work?
Polyester is a complex molecule that naturally occuring microbes have a hard time digesting, why standard polyester does not biodegrade. PrimaLoft® Bio™ optimizes the polyester or fabric fiber with a simple sugar, making the fibers easier and more pleasant for microbes to digest. Essentially, we make your fiber a Boston Cream Donut for microbes.
FAQ
Can Nereus® Bio be recycled?
Yes, Nereus® Bio can be chemically recycled and fits perfectly in a circular lifespan, and Nereus® Bio maintain a 95% yield rate through the chemical recycling process.
How does Nereus® Bio work with EU’s single-use plastic directive?
Polyester is a polymer, and therefore the end product could be considered as a “plastic”. This means that different measures from Single-Use Plastic Directive can be applied to your product.
Will Nereus® Bio biodegrade during usage?
Again, it’s a no. Nereus® Bio fibers in products do not biodegrade during usage. Only microplastics that leave products ending up in landfills or oceans will biodegrade, so there really is no special care required.
Does Nereus® Bio require a change in production set-up?
No, Nereus® Bio has the same characteristics and performance as regular PET fibers with the same output and same whiteness, and it blends well with natural fibers.
Will Nereus® Bio biodegrade on shelves?
No, Nereus® Bio only biodegrades in environments with naturally occurring microbes, such as landfills, oceans, and wastewater. Nereus® Bio comes in normal bales and has a normal shelf life with no need for special care or treatment during storage and transportation.
Can Nereus® Bio be used for my products?
Nereus® Bio can be added to any type of polyester and fabric fiber, from wadding, filtration, and automotive to acoustics, medical, and hygiene products.
How can we be sure it works on our set-up?
Before initiating full production, a sample is sent to 3rd party lab for an accelerated test that measures the initial behavior of the fiber. After the QC test for up to 90 days, we can verify that the technology works, and the staple fibers are approved.
Is Nereus® Bio available today?
YES! Nereus® Bio is already available from several locations worldwide, both virgin and recycled from a controlled supply chain. There is full capacity and delivery guarantee. And that’s why we can start fixing polyester right now.
Is Nereus® Bio scalable?
Yes, we are already commercial with BICO (low melting fibers), solid, and hollow fibers – and have no capacity issues.
How does Nereus® Bio work?
Polyester is a complex molecule that naturally occuring microbes have a hard time digesting, why standard polyester does not biodegrade. Nereus® Bio optimizes the polyester or fabric fiber with a simple sugar, making the fibers easier and more pleasant for microbes to digest. Essentially, we make your fiber a Boston Cream Donut for microbes.
