| HS Code | 473416 |
| Appearance | Colorless to slightly yellow transparent liquid |
| Ionicity | Weak cationic |
| Ph | 6.0-8.0 (1% aqueous solution) |
| Solidcontent | 30% ± 1% |
| Viscosity | 1000-3000 mPa·s at 25°C |
| Watersolubility | Easily dispersible or soluble in water |
| Hydrophilicity | Good |
| Softness | Super soft hand feel |
| Yellowing | Low yellowing tendency |
| Thermalstability | Good |
| Compatibility | Compatible with common textile auxiliaries |
| Shelflife | 12 months in sealed container |
As an accredited Super Soft and Hydrophilic Silicone Oil RH-NB-8098-4 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaging: 200 kg plastic drums with sealed inner liners, designed for safe storage and transport of RH-NB-8098-4. |
| Container Loading (20′ FCL) | Super Soft and Hydrophilic Silicone Oil RH-NB-8098-4 is packed in sealed drums and loaded into a 20-foot FCL for secure shipment. |
| Shipping | Super Soft and Hydrophilic Silicone Oil RH-NB-8098-4 is typically shipped in sealed plastic drums or IBCs. Keep containers upright, closed, and protected from sunlight, moisture, and freezing. Follow the SDS and local transport rules; classify according to current safety data before shipment. |
| Storage | Store RH-NB-8098-4 in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep containers tightly closed, protect from freezing and extreme temperatures, and store separately from strong oxidizers. Use secondary containment, clear labeling, and follow the SDS and local regulations. |
| Shelf Life | Typically 12 months in original unopened container, stored cool, dry, well-ventilated, away from direct sunlight and moisture. |
On compact-spun cotton and cotton/polyester shirting, the application of RH-NB-8098-4 is governed by the need to achieve softness and drape without sacrificing the rewetting required for perspiration transfer in tropical and formalwear categories. In pad-dry-cure finishing, the emulsion is first diluted in cold deionised water at 10–40 g/L, with the exact addition set by a factorial trial at 10 g/L, 20 g/L, 30 g/L, and 40 g/L because published data for this specific configuration is limited and the dose-response curve is seldom linear. The pad mangle is operated at a wet pick-up of 65–80% on woven poplin and twill, with roller pressure held between 2.0 bar and 2.8 bar depending on fabric weight. If ambient relative humidity exceeds 60%, pre-drying of the greige fabric and moisture measurement before padding are required to compensate for residual water content. The drying sequence on a Brückner Power-Frame stenter is arranged so that the first two chambers operate at 110–130°C to evaporate free water, while the final chamber reaches 150–170°C for 45–90 s to film-form without overcure yellowing. Hydrophilicity after treatment is checked by AATCC 79 drop absorbency and ISO 4920:2012 spray rating; an acceptable result on grey cotton poplin is a drop absorption time of ≤ 3 s and a spray rating of ≥ 3. The processing boundary is defined by emulsion shear stability: if the bath is recirculated through high-speed pumps before the pad nip, silicone droplets can coalesce and deposit on rollers as white spots. A 24 h standing test at pH 5.0–6.5 and 25–30°C is therefore used before startup, and the bath is stirred at a tip speed below 1.5 m/s. Incompatibilities requiring separation include strong anionic surfactants, high-valence metal salts such as magnesium chloride, and cationic fixatives based on dicyandiamide–formaldehyde resins, all of which can destabilize the emulsion and should not be added without a jar compatibility test.
The use of RH-NB-8098-4 on polyester microfiber sportswear knits in the 50–75 g/m² range is evaluated by dynamic moisture management performance rather than by static contact angle alone. The fabric is finished by foam application on a Gaston County foam finishing system or a Küsters kiss-roll unit, with wet pick-up restricted to 15–25% so that the microemulsion does not fill the interfilament capillary channels. After drying at 130–140°C for 60 s, the treated fabric is conditioned at 21±1°C and 65±2% RH and tested according to AATCC 195 for one-way transport index and spreading speed. The one-way transport index is compared with an unfinished control, and a relative loss greater than 20% is treated as a formulation failure because it indicates that the silicone film has reduced the capillary pressure gradient. In parallel, a drop absorbency result below 5 s on the backing layer is maintained by AATCC 79. The operational boundary is the pH of the foam concentrate: if the pH is held below 4.2 for more than 2 h before application, the polyether block of the silicone can hydrolyse and produce a tacky film that inhibits moisture spreading. The finish is also incompatible with high levels of hydrophilic polyester antistats of the quaternary ammonium type because the resulting ion pair can precipitate and reduce both foam stability and film clarity.
| Test endpoint | Method | Acceptance window | Production note |
|---|---|---|---|
| Drop absorbency | AATCC 79 | ≤ 5 s | Test on fabric back; do not pre-wet |
| Spray rating | ISO 4920:2012 | ≥ 3 after 1 wash | Verify nozzle height and water hardness |
| One-way transport index | AATCC 195 | ≥ 80% of unfinished control | Correct for fabric mass per unit area |
| Air permeability loss | ASTM D737 | ≤ 15% relative to control | Measure at 21±1°C, 65±2% RH |
For hydroentangled viscose/polyester coverstock in the 30–60 g/m² grammage range, used for hygiene coverstock and medical disposable bedding, the finish must maintain rapid strike-through while softening the surface hand. RH-NB-8098-4 is applied on the dry end by a kiss-roll or low-add-on foam system at 0.5–3.0% dry solids on fabric weight, with line speeds of 150–300 m/min on commercial nonwoven lines. Strike-through time is measured by NWSP 70.3, and absorption capacity is checked by ISO 9073-8; the finish is rejected if repeated strike-through time exceeds the unfinished control by more than 1 s. The main processing constraint is water hardness: the dilution water must have total hardness below 10°dH because calcium and magnesium ions bind to the hydrophilic block and reduce the enduring hydrophilicity of the coverstock. Through-air dryer temperature is held below 135°C to prevent volatilisation of the polyether component and subsequent loss of rewetting after storage. For skin-contact hygiene articles, the finished nonwoven is evaluated for cytotoxicity and skin irritation under ISO 10993-5 and ISO 10993-10, and silicone oligomer extraction is assessed by ISO 10993-12. The system should not be combined with cationic quaternary ammonium antistats at molar ratios above 1:3 because coacervation occurs and produces resinous deposits on engraved rolls.
Wet-end leather and microfibre synthetic suede lines that use RH-NB-8098-4 face a constraint that is absent from textile finishing: the silicone film must remain compatible with waterborne polyurethane topcoats and must not interfere with high-frequency embossing or finish adhesion. On full-grain leather, the silicone oil is introduced into the base coat at 2–8 wt% of the waterborne polyurethane dispersion to soften the grain without reducing wet adhesion. Finish adhesion is measured by ISO 11644; automotive leather specifications typically accept dry adhesion above 2.5 N/cm and wet adhesion above 1.5 N/cm, although published data for RH-NB-8098-4 in this specific configuration is limited. The dominant failure mode is silicone migration to the surface during drying, which causes intercoat adhesion loss and a hazy film. This is controlled by adding a non-ionic associative thickener at 0.2–0.5 wt% and by using forced air at 60–80°C before embossing. On microfibre synthetic suede produced without dimethylformamide, the silicone is introduced during the waterborne impregnation step, and the dynamic surface tension of the bath should be maintained below 35 mN/m to avoid cratering. The silicone should not be used neat with isocyanate crosslinkers because residual hydroxyl groups in the hydrophilic block consume isocyanate and alter polyurethane cure kinetics; if crosslinking is required, the addition order is predilution, pigmentation, silicone, then crosslinker under controlled viscosity rise.
In exhaust finishing on knitted cotton and viscose using jet dyeing machines operating at liquor ratios of 1:5 to 1:8, the critical variable is the shear history in the venturi and main pump rather than the bath temperature. RH-NB-8098-4 is injected through a dilute dosing line over 15–20 min at pH 5.0–6.0 and a bath temperature of 30–40°C after the final rinse. The main pump speed is reduced so that the nozzle pressure drop remains below 0.8 bar; above this value, shear-induced phase inversion can release silicone oil droplets that deposit as spots on the fabric. The bath is exhausted for 20–30 min, then the fabric is hydroextracted without rinsing to a moisture content of 50–70% before drying. Fastness of the hydrophilicity is tested by AATCC 61 after 3 wash cycles, and a relative reduction in drop absorbency greater than 20% is considered unacceptable. Residual salt in the bath must be below 0.5 g/L because reactive dye electrolyte destabilizes the emulsion and lowers exhaustion. Defoamers based on hydrophobic silica and mineral oil should not be added before the silicone because they compete at the air-water interface and produce uneven handle.
Silicone top-up rate in polyester POY false-twist texturing and nylon 6,6 draw warping is controlled by package density, friction coefficient, and heater plate cleanliness rather than by softness alone. RH-NB-8098-4 is not applied as a neat spin finish but is blended into the mineral-oil or ester-based finish concentrate at 5–15 wt% to improve fibre-to-metal lubricity while retaining package rewettability. Pick-up is controlled gravimetrically by Soxhlet extraction with n-hexane and by refractometric finish concentration; target oil content on yarn is 0.6–1.2 wt% for false-twist texturing and 0.8–1.5 wt% for draw warping. The modified finish is applied through ceramic slit jets or kiss rolls, and the oil content is measured every 2 h during continuous running. Deposits on the 170–220°C heater plate are evaluated by plate weight change over 24 h; an increase greater than 0.5 g indicates volatility mismatch between the silicone and the base fluid. The main incompatibility is with amine-neutralized phosphate esters in the same concentrate, which can form ionic complexes that precipitate and clog the spin finish pump. Published data for RH-NB-8098-4 in this exact application is limited, so mill trials should compare package density, friction coefficient, and downstream dyeability against the incumbent finish rather than extrapolating from textile softener data.
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Super soft hydrophilic silicone oil RH-NB-8098-4 is supplied as a clear to slightly translucent, nonionic polyether-modified polysiloxane fluid. The product is intended for pad-dry-cure finishing of cotton, viscose, lyocell, and cellulosic blends in which a low-yellowing soft hand and rapid water uptake must coexist after thermal fixation. Unlike amino-functional dimethylpolysiloxanes, RH-NB-8098-4 contains polyoxyalkylene substituents that remain water-compatible after drying; these groups reduce interfacial tension at the fibre-water boundary and allow drop absorption without addition of separate rewetting agents. The model designation identifies an amine-free organosiloxane backbone with a controlled silicone-to-polyether ratio. RH-NB-8098-4 is delivered as a water-dispersible concentrate and is normally diluted before use in horizontal or vertical pad-mangle finishing. The dry-film glass transition of the polyether side chains is below −25 °C, so ambient garment use does not produce the brittle fibre coatings sometimes observed with rigid resin finishes. The recommended sealed-container storage window is 5 °C to 40 °C. Partial phase separation below 0 °C may occur and can be reversed by mixing at 20 °C to 25 °C; however, high-shear recirculation should be limited because polyether-modified silicones can form shear-induced aggregates that reduce bath uniformity.
Incoming material control for RH-NB-8098-4 is typically verified against the product-class parameters shown below. These control bands are used in mill laboratories for screening and do not replace the vendor lot certificate, because batch-specific viscosity and non-volatile content may shift with the ratio of siloxane backbone to polyether side chain. The product is nonionic and generally tolerant of common finishing auxiliaries, but strongly cationic fixatives may produce turbidity in dilute working baths.
| Control parameter | Typical product-class band | Test reference |
|---|---|---|
| Appearance at 25 °C | clear to slightly translucent fluid | visual inspection |
| Non-volatile content | 98–100% | DIN EN ISO 3251 |
| pH, 1:10 aqueous dilution | 5.5–7.5 | ISO 4316 |
| Viscosity at 25 °C | 500–1500 mPa·s | ISO 3219 |
| Density at 20 °C | 0.98–1.03 g/cm³ | ISO 2811-1 |
| Ionic character | nonionic | supplier method |
| Cloud point, 1% dilution | 30–50 °C | internal optical method |
| Recommended storage life | 12 months at 5–40 °C | inverted package stability |
For production-scale dosing, RH-NB-8098-4 is often metered from 200 L drums or 1000 L IBCs using diaphragm or progressive cavity pumps. The product has low-to-moderate viscosity, but prolonged recirculation through high-shear gear pumps above 1500 rpm can increase dispersion particle size and cause local oil spotting on fabric. Inline static mixers should be operated with pressure drop below 2 bar during dilution at 20 °C to 30 °C. If the concentrate is added directly into a running pad trough without pre-dilution, concentration gradients can persist because the density of the fluid is close to that of water and mixing depends on bath turbulence. Batch-to-batch differences in fabric absorbency have been observed when working baths are held longer than 8 h at ambient temperature; therefore bath hold time should be validated by AATCC 79 drop absorption on side-centre-side fabric samples before starting a large lot. The fluid can generate foam under high turbulence, and mineral-oil defoamers that reduce hydrophilicity should be avoided.
Conventional amino-functional silicones impart high softness because the amino groups anchor to cotton and orient the siloxane backbone at the fibre surface. That same orientation exposes hydrophobic dimethylsiloxane segments to water and can reduce absorbency. In mill practice, bleached cotton knit processed with amino silicone at 10 g/L to 20 g/L pad bath frequently shows wetting times above 10 s in AATCC 79 after one wash, and in some cases above 30 s after 5 washes. RH-NB-8098-4 is amine-free and carries pendant polyethylene oxide/propylene oxide copolymers. The polyether segments migrate toward the water interface and maintain wicking times below 3 s on bleached cotton at 10 g/L, depending on substrate preparation and cure conditions. Yellowing is also reduced because no primary or secondary amine groups are present to undergo thermal oxidation at cure temperatures of 150 °C to 180 °C. Whiteness retention can be assessed with ISO 105-J02 or AATCC 110. The trade-off between softness and hydrophilicity is therefore shifted: RH-NB-8098-4 provides a super soft hand while retaining rapid wetting, whereas many conventional amino silicones require a post-treatment washing step or the addition of rewetting surfactants to achieve comparable absorbency.
The difference is also measurable in fabric handle tests. Handle-O-Meter stiffness can be recorded according to ASTM D6828 or ISO 17235. On 160 g/m² interlock cotton, polyether-modified hydrophilic silicones typically reduce bending resistance without the excessive surface lubrication that can produce an oily feel. Tensile retention after finishing is evaluated by ISO 13934-1, and rubbing fastness by ISO 105-X12. When RH-NB-8098-4 is combined with a DMDHEU resin finish, the softener can mask some loss of tear strength caused by crosslinking; however, overdosing above 40 g/L may interfere with crosslinker access and reduce crease recovery angle. Mill trials should bracket addition levels of 10 g/L, 20 g/L, and 30 g/L, with crease recovery angle measured by ISO 2313 or AATCC 66.
In horizontal or vertical pad-mangle application, RH-NB-8098-4 is metered into the finishing bath at 10 g/L to 40 g/L depending on fabric weight, liquor pickup, and target hand. The bath pH is maintained between 5.0 and 6.5 using acetic acid or citric acid. Lower pH can protonate polyether oxygen atoms and reduce water dispersibility, leading to unstable working baths and uneven finish distribution. The treated fabric is dried at 110 °C to 130 °C and thermofixed at 150 °C to 170 °C for 60 s to 90 s. For cellulosic blends containing polyester, cure temperatures up to 180 °C can be used without severe yellowing; whiteness should nevertheless be monitored with ISO 105-J02 on full-width trial runs. The finish bath can be combined with DMDHEU resin at 30 g/L to 60 g/L and magnesium chloride catalyst at 8 g/L to 15 g/L. The polyether chains in RH-NB-8098-4 lower the surface energy of the cured resin film, but the exact wetting time after resin finishing depends on catalyst type, crosslinking density, and fabric preparation. Published data for this specific resin-softener combination is limited, so a laboratory pad cure with the actual production resin is required before bulk preparation.
Compatibility with fluorocarbon finishes is constrained. Co-application with oil-repellent fluoropolymers can lower oil repellency below grade 4 in AATCC 118; if both water absorbency and oil repellency are required, RH-NB-8098-4 should be applied in a separate passage. Hard water stability is acceptable up to 300 ppm CaCO₃ in dilute form, based on jar-test observation, but water hardness above this limit may produce calcium soaps with anionic auxiliaries and reduce bath clarity. Exhaust application on hydrophobic polyester without adequate scouring is not recommended because the nonionic polyether side chains can accumulate on metal guide rollers if bath pH remains below 4.5 for more than 4 h.
The performance profile of RH-NB-8098-4 is governed by the combination of a flexible siloxane backbone and pendant polyoxyalkylene segments. The siloxane portion provides softness, surface smoothness, and fibre-to-fibre lubrication; the polyether portion provides water compatibility and durability of the hydrophilic effect through physical film formation and hydrogen bonding to cellulosic hydroxyl groups. This product is nonreactive under typical textile finishing conditions, so durability is not based on covalent condensation onto the fibre. The result is a finish that withstands repeated aqueous rinsing better than simple polyethylene softeners, while avoiding the hydrophobic recovery associated with amino silicones.
In crosslinked cellulose systems, the softener and resin compete for the fibre surface. At addition levels above 40 g/L, RH-NB-8098-4 can reduce the effectiveness of DMDHEU crosslinking because the softener film partially blocks fibre hydroxyl sites. Dimensional stability can be assessed after 1 and 5 household launderings according to ISO 5077 or AATCC 135. Tear strength retention can be measured by ISO 13937-1 or ASTM D1424. In comparative plant trials, a softening resin bath containing RH-NB-8098-4 at 20 g/L tends to retain a wetting time below 5 s after 5 washes on bleached cotton, while the corresponding amino silicone control commonly exceeds 10 s unless a rewetting agent is added. These values are representative class observations and must be confirmed on the specific fabric lot because yarn twist, knitting tension, and residual waxes influence absorbency.
The following systematic comparison illustrates the operational differences between RH-NB-8098-4 and two common softener classes used in cellulosic finishing. Values are representative product-class observations derived from routine mill screening; they do not replace lot-specific certificates for a given production order.
| Parameter | RH-NB-8098-4 | Amino-functional softener | Block-modified hydrophilic silicone |
|---|---|---|---|
| Wetting time after 5 washes on bleached cotton, AATCC 79 | 3–5 s | 10–30 s | 2–5 s |
| Soft hand | super soft, high bulk | high to very high | medium to high |
| Yellowing after 180 °C for 30 min | minimal | moderate to high | low |
| Ionic character | nonionic | cationic or nonionic depending on modification | nonionic |
| Durability mechanism on cotton | physical film and hydrogen bonding | cationic anchoring to fibre surface | physical film or reactive groups depending on type |
| Hard water tolerance, dilute bath | stable up to 300 ppm CaCO₃ | variable; cationic types may precipitate with anionic auxiliaries | stable up to 300 ppm CaCO₃ |
| Compatibility with fluorocarbon finishes | limited; may reduce oil repellency in AATCC 118 | generally poor; can degrade oil repellency | limited to moderate |
Operational boundaries for RH-NB-8098-4 include avoidance of co-application with cationic fixing agents at high concentration because pad roll deposits have been observed on continuous lines. Pre-drying at relative humidity above 70% RH can extend drying time and cause non-uniform migration of the finish film. Stenter airflow should be maintained at approximately 1500 m³/h per frame section, and residual fabric moisture at the exit should be monitored to avoid overdrying and stiffening. The product has no amine value because of its amine-free chemistry, but buyers should request REACH and RoHS compliance certificates for any regulated end use. Cyclic siloxane content may be controlled under the supplier specification and should be verified when the finished textile is destined for infant wear or medical garment applications.
When post-softening is required after cold pad batch dyeing, RH-NB-8098-4 can be applied in a separate padding step at 15 g/L to 25 g/L without disturbing direct or reactive dye fastness, provided the dyed fabric has been adequately soaped. Colour fastness to washing and water can be evaluated by ISO 105-C10 and ISO 105-E01. In high-speed continuous lines, the working bath should be replenished by metering rather than by slug addition to avoid temporary overdosing and associated oil patches. The use of automated conductivity or density monitoring in the finishing bath can improve consistency, although the nonionic nature of RH-NB-8098-4 limits the usefulness of conductivity-based control alone.
RH-NB-8098-4 is therefore positioned as a low-yellowing hydrophilic softener for mills that require absorbency and a super soft hand on cellulosic knits and wovens. The product differs from conventional amino silicones in its amine-free chemistry, from polyethylene-based softeners in its superior hand and film flexibility, and from some block-modified hydrophilic silicones in its controlled balance between surface lubrication and bulk recovery. However, compatibility with fluorocarbon finishes and strongly cationic auxiliaries remains a process boundary that must be managed through separation of application steps or jar testing before bulk production.
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