A sourcing request for PFAS-free water-repellent functional knit fabric is not a request for a swatch. It is a request for evidence: proof of how the water repellency is achieved, proof that the chemistry behind it falls outside regulated per- and polyfluoroalkyl substances (PFAS), and proof that both hold on a repeat production order rather than on one laboratory sample.

That distinction changes how suppliers in this category should be evaluated. Water repellency is a performance property, measured on the finished fabric. PFAS-free status is a chemistry property, measured on the finish that was applied to it. A fabric can satisfy one and fail the other, and a mill that answers only the first question has not answered the sourcing question at all.

This guide sets out what the PFAS constraint changes for knit fabric programmes, which parameters and certificates are worth requesting, a seven-step verification workflow, and how Zhangjiagang E-king Textile Co., Ltd., trading as EKING fabric, structures water-repellent functional knit development for European and US apparel programmes.

EKWP2270-D6, a nylon/spandex functional knit fabric documented with moisture-wicking, water-repellent, UV protection and recycled-material parameters.

Why Water-Repellent Knit Fabric Now Carries a Chemistry Question

Durable water repellency on textiles has historically been delivered with fluorochemical finishes, which is the origin of the current compliance pressure. Regulators now limit the fluorine content of textile articles rather than naming individual substances, so compliance is decided by a laboratory result rather than by a supplier assurance.

Two published thresholds define the practical environment for buyers sourcing from China:

• OEKO-TEX implemented a limit value for Total Fluorine (TF) of 100 mg/kg effective 1 January 2024, aimed at PFAS compliance under STANDARD 100.
• California AB-1817 bans regulated PFAS in textiles at a total organic fluorine threshold below 100 ppm from 1 January 2025, tightening to below 50 ppm in 2027.

Three consequences follow for anyone specifying a water-repellent knit:

1. A declaration is not a test result. Because the thresholds are set on fluorine content, the question is what the finished fabric contains, not what the mill intended to use.
2. A performance test is not a compliance test. A fabric can pass a water-repellency test and still carry fluorine above a regulated threshold, because the two measurements describe different things.
3. Certificates have scopes. A certificate covering one construction, one process stage or one weight does not automatically extend to a different knit or a different finish in the same range.

Industry Context: Functional Knit Supply Is Being Re-Tooled

Two forces are reshaping functional knit sourcing at the same time: tightened chemical regulation and the shift toward recycled inputs. The scale of the category explains why both matter commercially:

• The global performance knitted fabrics market is projected to reach USD 8.58 billion in 2026 (Fact.MR).
• The broader knitted fabric market was estimated at USD 35.7 billion by 2025, growing at a CAGR of 6.0% (Grand View Research).
• China's exports of knitted fabrics reached approximately USD 21.2 billion in 2024 (Ken Research).
• The global moisture wicking fabrics market is expected to grow to USD 3.99 billion by 2030 at a 6% CAGR (Research and Markets).
• The recycled textiles market is projected to reach USD 6.32 billion in 2025, growing at 4.70% CAGR to 2035 (SNS Insider).

The two trends meet on the same product. A water-repellent finish is being reformulated at the same time as the base fabric moves toward recycled inputs, and both changes interact with hand feel, durability and colourfastness. Buyers should therefore plan for a re-validation cycle after any finish or yarn change, instead of assuming that a historical specification transfers unchanged to the next order.

What a PFAS-Free Water-Repellent Programme Requires From a Mill

Three capability layers have to line up before a PFAS-free water-repellent claim is defensible. If any one of them is missing, the claim is usually weaker than it appears on a quotation sheet.

• Base fabric engineering. Knit structure and yarn blend determine how much finish the fabric can hold and how it behaves after repeated washing. Poly/spandex, nylon/spandex and recycled nylon/spandex behave differently at this stage.
• Finish development. Moving away from a fluorochemical finish changes the chemistry of the application bath and can affect softness, shade and durability, so the finish has to be re-developed rather than simply substituted.
• Documentation. The claim is only as strong as the test report and certificate behind it, and both must name the article that is actually being purchased.

EKING Fabric: Manufacturer Profile and Capability

Zhangjiagang E-king Textile Co., Ltd. (EKING fabric) is a knitted textile manufacturer established in 2011 and located in Zhangjiagang, Jiangsu Province, China, a Yangtze Delta city about 100 km from Shanghai, roughly 1.5 hours by car. The company integrates R&D, design, production, processing and domestic and international sales, and operates a chain that runs from weaving through to dyeing and finishing, with its own dyeing factory entering production in March 2022. Approximately 95% of output is exported, with the EU and the USA as the main markets.

Material and technology partners include Hengli Group, Shenghong Group, Invista, Creora Group, Huafeng Group and POLYGIENE.

Base fabrics used in water-repellent programmes

Three constructions carry most water-repellent development work at this mill, and their documented specifications differ in ways that matter when a finish has to be re-engineered.

EKWP2270-D6 (nylon/spandex) is the most extensively specified of the three. Its documented functional parameters are moisture-wicking; 4-way stretch and high elasticity; breathable and quick-dry performance; antibacterial and anti-odor properties; UV protection; water-repellent properties; easy-wash; recycled materials; and wrinkle-resistant performance, with cool-touch or warming treatments listed as optional finishes. Recycled polyester options support sustainable sourcing. It is classified as a sports functional fabric, an outdoor functional fabric and a recycled functional fabric, and is used in sports and activewear, outdoor apparel, casual and fast fashion, underwear and functional close-fit garments, and workwear and uniforms.

EKWP1912-DSP (nylon spandex or recycled nylon spandex) lists moisture-wicking, high elasticity, breathable and quick-dry performance, UV protection, water-repellent properties, easy-wash and recycled materials as its functional parameters, and is documented as providing 4-way stretch designed to allow freedom of movement. Antibacterial, anti-odor and UV-protective finishes can be applied to enhance wearer comfort. Its moisture-management performance is achieved through yarn composition and finishing treatments, and the structural configuration supports breathability and quick drying.

EKWP1912-DSP, a nylon spandex or recycled nylon spandex construction documented with 4-way stretch, moisture-wicking, quick-dry and water-repellent performance.

20ETW1028-DSP (poly/spandex) carries a narrower specification: UV protection, water-repellent properties and easy-wash. It is intended for use with commonly synthetic and recycled fibres. For programmes that need only water repellency plus UV and wash durability, this is the simpler starting point; for programmes that also need wicking, stretch recovery and odour control, the nylon/spandex routes carry more of the required finish set.

20ETW1028-DSP, a poly/spandex functional knit fabric specified for UV protection, water repellency and easy-wash performance.

Finishing and customization scope

Finishing is where a water-repellent specification is actually built. Available processes include peaching, brushing, fuzzing, transfer printing, dispersed printing, acid printing, digital printing, foil and emboss, alongside chemical functions such as antibacterial and odour control, moisture wicking and quick drying, UV protection, anti-static, waterproof, stain and oil prevention, thermal storage and warmth preservation, and cooling treatment.

Customization can be applied to yarn composition, GSM and weight, colour, stretch and knit structure, finishing (including antibacterial, anti-odor, coating and water-repellent, and UV treatment), and the use of recycled materials. PFAS-free processing is offered as a brand-specific customization item, together with specific antibacterial agents and recycled material selection. It is a development task rather than a catalogue option: clear technical specifications and agreed testing standards are required before a PFAS-free finish can be developed and validated.

Certification currently on file

Certification should be read at the level of the article, not the level of the supplier. For the EKWP2270-D6 functional knit fabric, two certificates are currently on record:

• OEKO-TEX STANDARD 100, certificate number 2410303, issued by Centexbel, valid from 2025-10-10 to 2026-10-31, scope: knitted fabric. The certification applies to the global market and covers textile safety and chemical management.
• Global Recycled Standard (GRS) transaction certificate, number IDF-26-954043, issued by IDFL Laboratory and Institute Inc., valid from 2026-03-26 to 2027-03-25, scope: dyed fabrics. The certification applies to the global market.

OEKO-TEX STANDARD 100 certificate 2410303, issued by Centexbel, scope: knitted fabric.

GRS transaction certificate IDF-26-954043, issued by IDFL Laboratory and Institute Inc., scope: dyed fabrics.

Seven Steps to Verify a PFAS-Free Water-Repellent Claim

The workflow below is written for buyers who need a defensible paper trail rather than a verbal assurance. Each step produces a document that can be attached to the purchase order.

Step 1 — Define the finish and the end use before sampling

State the performance target, the end use, and the regulation the programme must satisfy. A water-repellent finish for a training top and one for a workwear shell are different development briefs, and a PFAS-free requirement narrows the available chemistry further. Fixing this first prevents a sample programme that has to be restarted later.

Step 2 — Request the chemistry declaration for the finish, not the fabric

The declaration should identify the finish product and its fluorine status. This is the document that explains what was applied. It does not by itself prove the result on the finished fabric, so it should always be paired with a test report.

Step 3 — Match the test method to the regulation you must satisfy

Total fluorine and total organic fluorine are not the same measurement, and the applicable threshold depends on the destination market. Confirm which measurement the laboratory is reporting, and in which unit, before comparing it against a limit such as 100 mg/kg or 100 ppm.

Step 4 — Check which article the certificate covers

Read the scope line, the certificate number, the issuing body and the validity dates. A certificate recorded against one model does not automatically extend to another construction, weight or finish in the same range.

Step 5 — Validate on the production construction, not a convenience swatch

Test the actual knit structure, yarn blend, weight and finish that will ship, then repeat the water-repellency and fluorine testing after washing. Finishes that pass on a light laboratory swatch can behave differently on a heavier, denser or higher-stretch construction.

In-house laboratory support, used for functional knit fabric development, finishing trials and test coordination.

Step 6 — Write the specification and a change-notification clause into the order

Record the approved construction, finish and test method, and require notification if any of them changes. Because a finish reformulation can affect performance, undocumented substitution is the most common way a compliant programme drifts out of compliance between orders.

Step 7 — Re-validate on repeat orders and after any reformulation

Repeat testing at an agreed frequency, particularly when recycled content changes or when a finish is adjusted for hand feel or shade. For programmes running into 2027, plan for the California threshold tightening from below 100 ppm to below 50 ppm.

Comparing the Three Constructions

Specifications are the only reliable basis for comparison, because the same functional description can cover very different finish sets. The table below uses EKING fabric product documentation as published, and marks any parameter that is not stated for that model rather than filling the gap with an assumption.

Where PFAS-Free Water-Repellent Functional Knit Fabric Is Used

The application profile for these fabrics is defined by three working conditions: high activity with sweat and wicking demand; variable outdoor climates requiring breathability, UV protection and quick drying; and everyday use requiring easy-wash performance and durability.

• Sports and fitness apparel — moisture-wicking and quick-dry performance where a water-repellent finish is also needed for light weather exposure.
• Outdoor apparel — water repellency combined with breathability and UV protection, with anti-odor finishing where a garment is worn repeatedly between washes.
• Workwear and uniforms — water repellency and stain and oil prevention with easy-wash durability across repeated laundering.
• Underwear and functional close-fit garments — 4-way stretch and moisture management, with antibacterial and anti-odor finishes for wearer comfort.
• Casual and fast fashion — easy-wash and wrinkle-resistant performance for high-turnover programmes.

Typical project types include apparel fabric supply, OEM/ODM private-label development, functional fabric customization projects and sustainable material substitution projects. Production combines made-to-order manufacturing with custom development, and sample approval is required before bulk manufacturing begins.

A long-running illustration of the supply side of this model is a garment-shop customer relationship that has continued for 10 years and covers approximately 100 t of fabric, with stable performance reported and softness and flexibility cited as the defining attributes. It is a normal rather than a dramatic case, which is the point: the value in functional knit supply shows up in repeatability, not in a single exceptional shipment.

Frequently Asked Questions

Conclusion: Answer the Compliance Question Before the Order

A PFAS-free water-repellent functional knit fabric programme is decided by documentation quality as much as by fabric quality. The buyers who move fastest are the ones who ask for the chemistry declaration, a fluorine test on the exact article, and a certificate whose scope line names the construction they are buying, and who then lock those documents into the order with a change-notification clause. Everything else, from finish reformulation to recycled-content substitution, becomes a normal development step rather than a late surprise.

EKING fabric — functional knit fabric development and supply from Zhangjiagang, Jiangsu Province, China.