| HS Code | 285061 |
| Appearance | Colorless to pale yellow transparent liquid |
| Ionicity | Nonionic |
| Phvalue | 5.0-7.0 (1% aqueous solution) |
| Solidcontent | 20% ± 1% |
| Solubility | Readily soluble in water |
| Density | Approx. 1.00-1.05 g/cm³ at 25°C |
| Viscosity | ≤100 mPa·s at 25°C |
| Hydrophilicproperty | Imparts hydrophilic and antistatic properties to polyester |
| Handfeel | Improves soft and smooth hand feel |
| Application | Suitable for hydrophilic finishing of polyester and polyester blend fabrics |
| Dosage | 10-30 g/L |
| Paddingrate | 70%-80% |
| Bakingcondition | 160-170°C for 30-60 s |
| Packaging | 120 kg plastic drum |
| Shelflife | 12 months |
| Storage | Store in a cool, dry, ventilated place; avoid freezing and direct sunlight |
As an accredited Hydrophilic Finish Agent for Polyester RH-NB-6911GH factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | RH-NB-6911GH is supplied in 120 kg plastic drums with sealed inner liners, clearly labeled for industrial handling and transport. |
| Container Loading (20′ FCL) | Hydrophilic Finish Agent for Polyester RH-NB-6911GH loaded in a 20-foot FCL container, properly packed and secured for safe transport. |
| Shipping | RH-NB-6911GH is supplied in sealed, labeled drums or IBCs and shipped in clean, dry vehicles at ambient temperature, protected from freezing, moisture, and direct sunlight. Secure containers, avoid leaks, follow the SDS, and use appropriate personal protective equipment during handling. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and incompatible materials. Keep containers tightly closed, upright, and clearly labeled. Protect from freezing and extreme temperatures; avoid moisture and contamination. Follow the SDS and local regulations, and use first-in, first-out stock rotation. |
| Shelf Life | RH-NB-6911GH shelf life is typically 12 months from manufacture when stored sealed in a cool, dry, ventilated place away from sunlight. |
In polyester warp-knit base layers produced on E32 tricot knitting machines, RH-NB-6911GH is introduced into the finishing bath after disperse dyeing and alkaline reduction clearing because the reduction-cleared surface lacks the natural fibre hydrophilicity needed for wicking. A horizontal pad mangle with 70–80% wet pickup applies the finish at 20–35 g/L; this corresponds to 1.4–2.8% owf on dry fibre mass. The bath is held at pH 5.0–6.0 with citric acid, and deionised water with hardness below 50 ppm CaCO₃ is preferred to prevent precipitation. Curing on a 3.2 m wide stenter with an 8-zone gas-fired oven at 170–180 °C for 45–60 s produces a finish that withstands 20 home launderings according to AATCC TM 61-2013 2A without losing all wicking. Compliance for this segment requires wetting time measured by AATCC TM 79-2018 not exceeding 5 s, moisture management parameters under AATCC TM 195-2021, formaldehyde release below 75 ppm per ISO 14184-1:2011, and OEKO-TEX Standard 100 Annex 4 Class II certification for skin-contact textiles, with screening against ZDHC MRSL V2.0 discharge limits. Terminal products entering this line include polyester leggings, base-layer tops, and running singlets, where the finish functions as both moisture-transport and anti-static agent.
Because PET spacer and tricot headliner fabrics are adhesive-laminated to polyether-polyurethane foam sheets, RH-NB-6911GH is used to reduce aqueous contact angle on fibre surfaces without introducing low-molecular-weight siloxane bloom that can increase fogging condensate. The finish is applied from an aqueous pad bath at 10–25 g/L on a nip-controlled padder with 60–70% pickup, resulting in 0.6–1.75% owf; a blocked aliphatic polyisocyanate crosslinker at 2–4 g/L is typically co-formulated to improve resistance to the solventless polyurethane adhesive system used later. Processing proceeds on a stenter at 140–160 °C for 30–60 s, with exhaust humidity held above 20% to prevent overcure and yellowing. For automotive interior compliance, the finished fabric is tested under VDA 278:2011 for VOC and FOG fractions, DIN 75201-B:2011 for gravimetric fogging, ISO 3795:1989 for horizontal burn rate, and ISO 105-B02:2014 for lightfastness where exposed surfaces must retain grade 4 or higher after 100 hours. A production-scale failure mode observed on stenter lines is migration of unreacted finish to the fabric face when the pad bath pickup exceeds 75%, causing uneven adhesive wet-out and lamination peel; limiting pickup to ≤70% avoids this defect. Terminal products are polyester roof liner facings, pillar trim cover cloths, and sun visor cover fabric, where the finish improves adhesive wet-out and reduces static accumulation during die cutting.
For 40–80 g/m² polyester carded spunlace used in disposable hygiene, strike-through is controlled less by bath concentration than by add-on uniformity and fibre-surface cleanliness. RH-NB-6911GH is applied inline via kiss roll at 0.6–1.5% solids on dry fibre immediately after hydroentanglement; the finish bath is diluted with deionised water and passed through a 25 µm filter to avoid nozzle clogging. Hydroentanglement is run at 60–120 bar with vacuum slot dewatering to 70–80% residual moisture before finish application; downstream drum drying at 130–150 °C leaves a moisture content below 0.5%. The relevant compliance standards are ISO 9073-6:2003 for liquid absorptiveness, NWSP 010.4.R0 for water absorption time, EU Regulation (EC) No 1223/2009 for cosmetic wipe safety, and OEKO-TEX Standard 100 Annex 4 Class I for infant skin-contact products. Terminal product lines include facial wipes, disinfecting wipes, and lens cleaning cloths. A process conflict arises with excessive finish add-on above 1.8% solids: wetting speed increases but the web becomes hydroplastic and may wrap the calender rolls, causing mill downtime. Published data for this specific configuration is limited; converter trials should set strike-through targets at ≤3 s for 45 g/m² spunlace.
| Application segment | Compliance standards | Measured property or limit |
|---|---|---|
| Warp-knit activewear | AATCC TM 79-2018; AATCC TM 195-2021; ISO 14184-1:2011; OEKO-TEX Standard 100 Annex 4 Class II; ZDHC MRSL V2.0 | Wetting time ≤5 s; one-way transport index ≥3; formaldehyde ≤75 ppm |
| PET headliner knit | VDA 278:2011; DIN 75201-B:2011; ISO 3795:1989; ISO 105-B02:2014 | VOC/FOG by OEM specification; fogging condensate ≤2 mg; lightfastness grade ≥4 |
| Spunlace hygiene | ISO 9073-6:2003; NWSP 010.4.R0; EU Regulation (EC) No 1223/2009; OEKO-TEX Standard 100 Annex 4 Class I | Absorption time ≤3 s; liquid absorptive capacity ≥300% |
| Medical wound contact | ISO 10993-5:2009; ISO 10993-10:2021; ISO 11737-1:2018; ISO 14184-1:2011 | Cytotoxicity grade 0/1; no skin irritation; bioburden ≤100 CFU/g; formaldehyde ≤75 ppm |
| Microfibre bedding | GB/T 21655.1-2008; AATCC TM 79-2018; AATCC TM 76-2018; ISO 12945-2:2020 | Wetting time ≤5 s; surface resistivity ≤1010 Ω/sq; pilling grade ≥4 |
| PET needlefelt filtration | ASTM D6767-20a; ISO 11058:2010; FDA 21 CFR 177.1630; REACH Annex XVII | Pore-size distribution; water permeability coefficient; no food-contact migration above regulatory limit |
In devices sterilised by gamma radiation at 25–35 kGy, the oxidation of PET surfaces and degradation of some hydrophilic finishes can reduce wicking after terminal sterilisation. RH-NB-6911GH is applied to pre-scoured and bleach-prepared PET woven fabric at 1.5–3.0% owf using a horizontal padder in an ISO 14644-1:2015 Class 8 cleanroom; the bath is prepared with water for injection or pharmaceutical-grade demineralised water, filtered through a 1 µm absolute filter, and maintained at pH 5.5–6.5. Finishing on a cleanroom stenter at 150–160 °C for 45–60 s reduces bioburden before sealing. Compliance is evaluated against ISO 10993-5:2009 for in vitro cytotoxicity, ISO 10993-10:2021 for irritation and skin sensitisation, ISO 11737-1:2018 for bioburden, and ISO 14184-1:2011 for formaldehyde release. Terminal products are non-adherent wound contact layers and exudate transfer sheets. An operational boundary recognised in converter validations is that gamma doses above 40 kGy can produce acidic oxidation species that reduce water uptake; if the device is double-sterilised, re-testing by AATCC TM 79-2018 is mandatory. The finish is not a sterilisation-resistant coating and does not replace validation of the finished device under ISO 13485:2016, nor can it be presented as a microbial barrier.
Brushed polyester microfibre sheeting and mattress protector ticking tend to retain surface charges and exhibit electro-cling after tumble drying; RH-NB-6911GH is introduced in exhaust dyeing or in post-dye finishing to build hydrophilicity that reduces static propensity without using quaternary ammonium compounds that yellow under heat. In package dyeing or jet dyeing, 2–4% owf is dosed after clearing at 130–135 °C for 30–45 min at pH 4.5–5.5; in continuous pad finishing, 15–30 g/L at 70–80% pickup is applied on a stenter at 150–170 °C for 45–60 s. Compliance for the segment includes GB/T 21655.1-2008 for moisture absorption and quick drying, AATCC TM 79-2018 for wetting time, AATCC TM 76-2018 for surface resistivity, ISO 12945-2:2020 for pilling resistance after 2,000 cycles, and ISO 14184-1:2011 for formaldehyde. Terminal products are printed and piece-dyed microfibre sheet sets, pillow covers, and mattress protector face fabrics. The finish is incompatible with high-viscosity amino-functional silicone softeners above 0.5% owf, which can mask hydrophilicity and require a second wetting agent; field data from jet dyeing machines show that adding RH-NB-6911GH simultaneously with silicone softener in the cooling bath causes micro-emulsion phase separation and barrel deposition, so sequential addition is required.
Polyester needlefelt used in filter bags and cartridge wrappers must wet with water instantly to avoid air-binding and rising differential pressure across the media. RH-NB-6911GH is padded at 5–15 g/L on singed and calender-treated needlefelt of 200–600 g/m², yielding 0.3–0.8% owf; the low add-on is deliberate because higher finish levels swell the fibre surface and reduce permeability. The line configuration includes a two-bowl padder with controlled nip pressure of 40–60 N/cm, followed by a multi-pass gas-fired oven at 130–160 °C with web tension below 10 N/cm to preserve pore structure. Compliance references are ASTM D6767-20a for pore size distribution, ISO 11058:2010 for water permeability, FDA 21 CFR 177.1630 for polyester in repeated-use food-contact filter components, and REACH Annex XVII restrictions. Terminal products are depth filter bags, pleated filter cartridge support layers, coalescing media, and oil-field dewatering sock liners. Over-drying above 180 °C or residence beyond 90 s produces yellowing and a measurable increase in water contact angle on the fibre surface, which reverses the wetting gained from the finish; on production needlefelt ranges, the final zone temperature should therefore be capped at 165 °C with a residence time of 60–75 s.
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Hydrophilic Finish Agent for Polyester RH-NB-6911GH is a water-dispersible finishing auxiliary formulated to alter the surface behaviour of polyethylene terephthalate and polyester-rich textiles. The model designation RH-NB-6911GH identifies a compounded preparation rather than a single chemical entity; the formulation is intended to convert the inherently low-energy polyester surface into a water-wetting capillary network without replacing the base fibre. The product is applied by pad-dry-cure or exhaust methods on woven and knitted constructions used in sportswear, linings, mattress ticking, and automotive interior fabrics. Because the active composition is proprietary, independent published data for this specific configuration is limited; application conditions must therefore be established on the target fabric rather than transferred from generic hydrophilic finishes.
RH-NB-6911GH is normally supplied as an aqueous dispersion with a low to medium viscosity. The material is not classified as a solvent-borne finish; the exact delivery specification is defined in the manufacturer’s certificate of analysis. Parameters recorded on receipt include appearance, pH of an aqueous dilution determined in accordance with ISO 787-9:2019, non-volatile content determined by ISO 3251:2019, and viscosity determined by rotational viscometry under ISO 3219:1993. A change in any of these values outside the approved control range may indicate phase separation, microbial contamination, or batch drift. A batch that exhibits a visible creaming layer after storage at 25 °C can often be re-homogenised under low-shear agitation, but the re-homogenised material should be retained for a comparative wicking trial before production use.
Preparation of the pad bath follows the principle of adding the finish to water under moderate agitation, not water to a concentrated finish. If a co-binder or antifoam is required, it is pre-diluted and added last. The bath is held at 20–30 °C; if cold water below 10 °C is used, the product may thicken and produce uneven pickup. Bath life is confirmed by viscosity measurement at 0 h, 4 h, and 8 h; a viscosity drift greater than 10 % from the initial reading indicates instability or microbial growth. Biocides may extend bath life but are not universally compatible with non-ionic finish dispersions.
Before finishing, the polyester substrate must be free of hydrophobic contamination. Spin finish oils, waxes, and excess dyeing auxiliaries are removed by a pre-scour with a non-ionic detergent at 60–80 °C, followed by rinse and drying. Residual oil content is not easily measured on production fabric; a practical in-line check is to apply a single water drop by AATCC 79 to the pre-scoured fabric and require wetting within 3 s before the finish is applied. If the substrate does not wet within this range, further scouring is required because the hydrophilic finish cannot compensate for a heavily contaminated surface.
Fabric construction influences liquor retention. Microdenier knitted polyester retains more bath than densely woven taffeta; wet pickup is determined gravimetrically. For knits, pickup of 60–80 % is typical; for woven taffetas, 50–70 % is common. These ranges are production control references rather than product specifications. Padding is carried out on a two-roll or three-bowl padder with controlled roll pressure. The most frequent production failure is uneven roll pressure producing selvedge-to-centre variation in wicking after drying. Bath application is maintained at 25–35 °C. Drying in a stenter frame at 110–130 °C removes water while preserving film continuity. The curing step, when required for durability, is typically performed at 160–180 °C for 30–60 s; however, the exact thermal window for RH-NB-6911GH must be taken from the supplier’s technical datasheet. Over-curing can reduce hydrophilicity by thermally degrading the hydrophilic segment or by causing film embrittlement. Under-curing leaves a water-extractable deposit that is removed in the first domestic wash.
In high-speed stenter finishing at 40–60 m/min, dwell time in the curing zone can be below 30 s; this is a common source of under-curing. If the stenter length cannot provide the required dwell, speed must be reduced or cure temperature raised within the product’s tolerated range. Foam application can reduce water consumption and drying energy. A stable foam with a blow ratio of 1:4 to 1:8 and a foam density of 0.1–0.25 g/cm³ is applied to one side; the foam must collapse after application to form a continuous film. An over-stabilised foam leaves a discontinuous deposit and poor wicking.
Finished fabric is conditioned according to ISO 139:2005 before testing. Wickability is assessed by vertical wicking height over 10 min using AATCC 197; water absorbency is measured by AATCC 79; surface wettability after laundering is evaluated by AATCC 61 using the test conditions relevant to the intended wash durability. Drying rate is measured by AATCC 200. Because the product is intended to retain moisture transport through repeated laundering, the critical control is not initial wetting alone but wicking retention after 5 or 10 domestic cycles. A finish that wets rapidly before the first wash but fails after 3 cycles indicates insufficient film formation or under-curing.
For exhaust application on jet dyeing equipment, the product is introduced after dyeing and reduction clearing. A typical sequence adds the finish at 40–50 °C in a fresh bath adjusted to pH 4.5–5.5 with an organic acid. The bath is circulated for 15–20 min before unloading. Strongly acidic conditions below pH 4.0 or prolonged exposure above 80 °C may destabilise the dispersion and produce deposits on machine walls and filter screens. Softened or deionised water is preferred because high hardness can interact with the formulation. If electrolyte is carried over from the dyebath, bath stability is checked by measuring turbidity and viscosity over 30 min at 25 °C before fabric is loaded.
Jet machine turbulence can shear the finish at the venturi. If the product is a dispersion, excessive shear may produce agglomerates that accumulate on the filter pack. A filter inspection after the first batch is therefore recommended when the finish is run on a high-turbulence jet. The bath should not be reused unless the remaining active content has been verified by a validated analytical method. In practice, spent finish baths are discarded because carryover of oligomers and residual dye can interfere with film formation on the next lot.
Compared with conventional aminofunctional silicone hydrophilic softeners, RH-NB-6911GH is positioned for production where subsequent lamination, coating, adhesive bonding, or print adhesion is critical. Silicone films may lower surface energy and create interliner adhesion problems in lamination; a non-silicone hydrophilic finish can reduce this mode of failure. However, the non-silicone chemistry may provide less bulk softness than silicone-based products. When fabric hand is a requirement, a compatible softener is selected by jar test. Published data for this specific configuration is limited; no independent comparison of peel strength after lamination is available.
Compared with simple ethoxylated non-ionic wetting agents, the intended difference is durability. A non-durable surfactant wetting agent is removed in the first rinse; RH-NB-6911GH is expected to resist aqueous extraction once cured. This does not make it permanent under aggressive alkaline laundering or industrial laundering with strong oxidisers. The finish is not a substitute for a wash-resistant soil-release polymer if the final article must withstand institutional laundering.
Compliance assessment for RH-NB-6911GH follows the standard documentation hierarchy for textile auxiliaries. The table lists the evaluation framework commonly required by brand and retail buyers. The specific compliance status of the product must be confirmed from the supplier’s current regulatory data sheet for the batch supplied.
| Framework | Reference | Typical assessment item |
|---|---|---|
| EU REACH | Regulation (EC) No 1907/2006 Annex XVII | Restricted substances in article; safety data sheet exposure scenarios |
| EU RoHS | Directive 2011/65/EU Annex II | Lead, mercury, cadmium, hexavalent chromium, PBB, PBDE |
| ZDHC MRSL | ZDHC MRSL V3.1 | Formulation restrictions for textile and footwear supply chain |
| OEKO-TEX | STANDARD 100 | Finished article limits for harmful substances |
During production, standard industrial hygiene applies. The dyehouse keeps the product away from strong oxidising agents and concentrated alkalis unless compatibility is confirmed. Spills are collected with inert absorbents and disposed of according to local regulation. The product is not to be mixed with cationic amine-based fixatives unless a specific jar test shows absence of coacervation at working dilution.
For microdenier warp-knit polyester used in next-to-skin clothing, the finish is applied in the final rinse after reduction clearing. The knit is unloaded with a residual moisture of 60–80 %, followed by tumble drying at 100–120 °C. In this configuration, handle is dominated by fabric construction rather than the finish film. If the fabric is subsequently heat-set at 180 °C for 60 s, the finish may survive but yellowing should be checked. The final garment is tested for wicking retention after 10 domestic wash cycles.
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