Zero
Persistence
Microplastic
Starts From
The Fiber

High-Performance Biodegradable Polyester

Ready for Scale

Rethinking Clean Textiles — Next-gen Fiber & Filament Solutions

Explore Our Fibers Request a Sample

* "Zero Persistence Microplastic" refers to zero persistent microplastic remaining in the marine environment after biodegradation, as tested under ASTM D6691.

35%
of microplastics in the ocean come from synthetic textile products — primarily conventional polyester.
70M
tons of polyester fiber are produced every year. Conventional PET takes centuries to degrade in any environment.
73%
of waste garments are sent to incineration or landfill. The industry needs solutions built into the material — not greenwashing, not future commitments, not offsetting.
Why THK

Engineered for
real-world application.

We don't ask brands to choose between performance and responsibility. Every THK fiber is benchmarked against conventional PET — across moisture management, durability, softness, and end-of-life impact.

01 —
Marine-Biodegradable Technology
Biodegradation is engineered into the polymer chain itself — not a coating, not a post-treatment. THK fibers undergo complete microbial decomposition in marine and composting environments — leaving zero persistent microplastic fragments in the environment after biodegradation (tested under ASTM D6691).
02 —
Cradle to Cradle Certified® Gold
One of the world's most rigorous material certifications — evaluating Material Health, Circularity, Clean Air & Climate, Water & Soil, and Social Fairness. C2C Gold demands verified compliance across every dimension, not just recycling. Documented. Ready for your compliance, sustainability, and marketing teams. Certification documentation available upon request.
03 —
Drop-in Replacement
No re-tooling. No process change. THK fibers integrate seamlessly into existing spinning and weaving operations — FDY, DTY, and staple fiber lines. What changes is the fiber inside your product — and the credible sustainability story you can bring to your customers and compliance teams. That's the real differentiation.
The Science Behind It

What "Biodegradable" Actually Means — And Why It Matters Here.

Most synthetic fibers that claim "biodegradability" rely on additives or compostable coatings that only work under controlled industrial conditions — not in the environments where microplastics actually end up. THK is different.

Why Marine Matters Most

Every wash cycle releases microfibers into wastewater. Conventional synthetic textiles shed microplastics that accumulate in oceans for centuries — entering the food chain and eventually re-entering human diets. Marine biodegradability is the only test that reflects how microfibers actually behave in the real world.

THK Verified Under
ASTM D6691 — Marine Biodegradability
ASTM D5988 — Soil Biodegradability
Cradle to Cradle® Biological Cycle
Zero Persistent Microplastic — What It Takes

To qualify as truly non-persistent, a fiber must satisfy three simultaneous criteria — not just one. THK meets all three:

Marine biodegradable — fragments break down in seawater via microbial action (ASTM D6691)
No toxicants released — degradation byproducts are verified non-toxic to marine ecosystems
Non-ecotoxic — no harmful impact on aquatic organisms or the wider food chain
EU Regulatory Context

The EU's Circular Economy Action Plan and the 2018 Plastics Strategy are moving toward mandatory restrictions on microplastic-releasing synthetics by 2030. Biodegradable polymers that meet verified degradability standards are expected to qualify for exemptions under future EU regulations. THK fibers are positioned to be compliant ahead of these requirements.

Reference
EUR-Lex 52019DC0640
EU Green Deal Action Plan
Performance Data

What "biodegradable"
actually feels like to wear.

Our fibers were benchmarked against conventional PET using industry-standard tests at the Taiwan Textile Research Institute (TTRI), Intertek Shanghai, and the University of Applied Sciences Reutlingen. Here's what we found.

Testing labs & standards Taiwan Textile Research Institute (TTRI)
Intertek Shanghai
University of Applied Sciences Reutlingen (2024/2025)
ASTM · ISO · AATCC · DIN methodologies

All individual test reports available upon request.
Haptic Performance
Softer Than Conventional Polyester
In blind haptic tests with 30 participants, THK biodegradable fiber was rated softer and more comfortable than PET across fibers, nonwovens, and knits — consistently and by a clear margin.

Softness score: 7.9 / 10 vs PET 6.8 / 10.
→ Next-to-skin applications that feel premium without a premium fiber blend.
Moisture Management
On Par With PET — Documented
OMMC final score: 0.61 (Good) vs PET 0.63. Quick-dry time: 4.7 min vs PET 4.5 min. Breathability (Ret): 1.51 m²·Pa/W vs PET 1.42 m²·Pa/W.

Moisture regain: 0.8% vs PET 0.4% — better humidity buffering, reduced static buildup.
→ Activewear that performs to spec. No asterisks, no compromises.
Durability
Full-Cycle Durability — Documented
Abrasion resistance: 120,000 cycles (ISO 12947) — intact. Pilling resistance: Grade 4–5 (ISO 12945). Tensile strength: 478 N lengthwise — on par with PET.

UV exposure: better color stability than PET under accelerated solar exposure (30-day equivalent).
→ Standard warranty claims hold. No product liability surprises.
Absorbency
A Genuine Upgrade Over PET
Liquid absorbency up to 2–3× higher than virgin PET depending on construction — approaching cotton levels. In nonwoven form: 2,543% vs PET 114% (DIN 53923).

Closer to natural fibers in moisture buffering profile.
→ A synthetic that actually absorbs sweat, not just wicks it away.
THK vs Conventional Alternatives
THK Fiber Virgin PET Recycled PET Cotton
Marine biodegradable ✓ ✗ ✗ ✓
Cradle to Cradle Certified® Gold ✓ ✗ Partial ✗
Drop-in for existing PET lines ✓ ✓ ✓ ✗
OMMC moisture score (Good = 0.61+) 0.61 ✓ 0.63 ~0.60 ~0.50
Softness rating (blind test, /10) 7.9 ✓ 6.8 ~6.5 N/A
Abrasion resistance (120k cycles) ✓ Intact ✓ Slight wear ✓ —
UV color stability vs baseline Superior ✓ Baseline Baseline —
Custom engineering capability ✓ Limited Limited ✗

* Blind haptic test, 30 participants, University of Applied Sciences Reutlingen, 2024 & 2025.
* OMMC: AATCC TM195-2017. Abrasion: ISO 12947. Softness: Emtec TSA + subjective panel.
* All individual test reports available upon request — contact julien@thkfibers.com

Product Range

Available
Specifications.

Commercial quantities. Engineered to your application. All specifications are available for sampling, pilot runs, and commercial orders.

50D / 72F
Filament Yarn — Microfiber Grade
Best for
Base layers · Intimates · Lightweight activewear · Next-to-skin applications
Ultra-fine filaments deliver next-to-skin softness that outperforms virgin PET in haptic tests — without any finishing treatment. Superior moisture regain means real comfort under exertion.
75D / 144F
Filament Yarn — High Density
Best for
Performance fleece · Mid-layers · Athletic outerwear · Premium knitwear
High filament density creates superior loft and pill resistance (Grade 4–5). Engineered for garments that work hard and wash repeatedly across their full commercial life.
Custom Specifications Available
Denier, filament count, and processing profile tailored to your exact application.
Submit Development Brief
6D
High-Loft Staple Fill
Best for
Thermal insulation · Padding fill · Technical nonwovens · Performance outerwear
Liquid absorbency 22× higher than virgin PET in nonwoven form (2,543% vs 114%, DIN 53923). A direct drop-in for conventional polyester fill — with marine biodegradability and C2C Gold certification built in.
Key Data
Absorbency (DIN 53923): 2,543%
vs conventional PET fill: 114%
Softness (haptic test): 9.0 / 10
Processing: Drop-in for existing fill lines
Certification: C2C Gold · Marine Biodegradable
Staple Fibers for Spinning
Custom denier and fiber architecture available for spinning and carding applications.
Request Specs
Custom Engineering
Your Application.
Our Polymer Science.
We adapt fiber architecture to your specific product requirements — not the other way around.
Process Integration

Your mills don't
need to retool.

THK fibers are processed on standard polyester spinning and weaving equipment. No new supplier qualification processes beyond the fiber itself. No process engineering investment. No extended development timeline.

Chat With Us
FDY
Fully Drawn Yarn lines — standard compatibility
✓
DTY
Draw Textured Yarn lines — standard compatibility
✓
STA
Staple fiber / carding — direct drop-in replacement
✓
NWV
Nonwoven production lines — no process change required
✓
QA
Sampling & pilot runs available before commercial commitment
✓
About THK

Rethinking
Clean Textiles.

THK Greenery Technology (森彥本草永續科技) was founded on a single conviction: that the textile industry's dependence on conventional synthetic fibers is a problem that must be solved at the material level — not managed through offsetting or post-processing.

We develop biodegradable, high-performance polyester yarns and fibers that integrate directly into existing manufacturing infrastructure — making the transition to responsible, future-proof materials a commercial decision, not a compromise.

Headquartered in Taiwan, we work with brands, mills, and product developers across global supply chains.

Performance
We don't ask brands to sacrifice function for sustainability. Every claim is backed by independent test data.
Transparency
Every claim is certified. Every specification is documented. All test reports available upon request.
Scalability
Innovation that works on the factory floor, not just in the lab. Drop-in ready. Commercial quantities available now.
Innovation Partnership
Chichampe™
THK is the material innovation partner behind Chichampe's engineered fabric systems — bridging raw fiber innovation with finished product application for global brands.
Certification
Cradle to Cradle Certified® Gold
Meeting the highest global standards for material circularity. Verified independently. Applicable to brands' product claims and sustainability reporting.
Contact

Let's build something
better.

Whether you're sourcing raw materials, developing a new product line, or evaluating sustainable fiber alternatives — we're here.

We welcome technical conversations, development briefs, and sample requests. Our team responds within 1–2 business days.

Email
julien@thkfibers.com
Web
thk-textiles.com
Based
Taiwan — Global Supply Chain
Techtextil Frankfurt 2026
Meeting us at Techtextil Frankfurt 2026?

APR 21 – 24, 2026 BOOTH HALL 9.0 · C13
We welcome walk-in conversations at our booth.
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