| HS Code | 442446 |
| Productname | PEG Silicone Fluid RH-SPE-193HP |
| Chemicaltype | Polyether-modified silicone |
| Ioniccharacter | Nonionic |
| Appearance | Colorless to light yellow transparent liquid |
| Viscosityat25c Cst | 300-500 |
| Specificgravityat25c | 1.05-1.08 |
| Refractiveindexat25c | 1.44-1.45 |
| Surfacetension Mn M | 20-25 |
| Hlbvalue | 11-13 |
| Watersolubility | Soluble or dispersible |
| Activecontent Percent | >=99 |
| Phat25c | 6-8 |
| Flashpoint C | >100 |
| Shelflife Months | 24 |
As an accredited PEG Silicone Fluid RH-SPE-193HP factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | PEG Silicone Fluid RH-SPE-193HP is packaged in 200 kg polyethylene-lined steel drums, sealed for safe industrial transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with PEG Silicone Fluid RH-SPE-193HP in sealed drums, properly secured and stowed for safe ocean transport. |
| Shipping | PEG Silicone Fluid RH-SPE-193HP is typically shipped in sealed plastic drums or IBC totes. Keep containers closed, dry, and protected from extreme temperatures. Verify hazard classification, labeling, and documentation against the current SDS and applicable transport regulations before shipment. |
| Storage | Store PEG Silicone Fluid RH-SPE-193HP in original, tightly closed, labeled containers in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat, ignition sources, and incompatible materials such as strong oxidizers, acids, and alkalis. Protect from freezing and contamination. Follow the manufacturer’s SDS for specific temperature limits and handling requirements. |
| Shelf Life | PEG Silicone Fluid RH-SPE-193HP typically has a 24-month shelf life from manufacture when stored sealed under recommended conditions. |
On a continuous Maxfoam line with a trough-type fall-plate and a multipin mixer head operating at 3 500–5 500 min⁻¹, RH-SPE-193HP is introduced into the polyol stream ahead of the metering pump to ensure low-shear predispersion and avoid unmixed surfactant slugs. In a reference slabstock formulation using TDI 80/20, water at 4.2 pphp, and a low-amine catalyst package, the evaluation range is 0.4–1.2 pphp of total polyol; at 0.25 pphp, cell window rupture occurs between 75 s and 85 s rise time, producing top collapse and block density gradients larger than 3 kg/m³. The upper boundary near 1.4 pphp induces over-stabilisation, visible as a tight top skin, delayed blow-off, and residual indentation force deflection deviations above 8% under ISO 3386-1:2016. Production-scale blocks are conditioned for 24 h at 18–25 °C before slitting; tensile and tear properties are checked under ASTM D3574-17, with air permeability used as the preferred indirect control for cell openness because foam hardness alone masks stabiliser drift across different polyol hydroxyl numbers. The stabiliser must remain hydrolytically stable in tin-free formulations where residual water in the polyol and delayed catalyst action raise the local exotherm above 70 °C; phase separation in the polyol preblend after 72 h indicates poor compatibility and will produce a non-uniform cell structure at the block edges. Because published data specific to RH-SPE-193HP are limited, the initial pphp range is routinely confirmed on a pilot Maxfoam unit before full-width production; batch-to-batch variation in surfactant activity is monitored by foam rise height at a fixed cream profile. Terminal products include mattress cores, furniture seating cushion blanks, quilted panels, and OEM automotive seat inserts where low volatile organic emissions are assessed under CertiPUR-US and OEKO-TEX Standard 100 Annex 4. REACH Annex XVII restrictions apply to catalyst-derived organotin compounds and other restricted substances; the stabiliser itself should be verified against the latest SVHC candidate list before EU shipment.
In waterborne acrylic-urethane topcoats applied by air-assisted airless spray at 28–32 s DIN cup 4 viscosity, RH-SPE-193HP is post-added during the letdown step after the grind phase; early addition before high-speed dispersing at tip speeds above 12 m/s generates microfoam that persists for more than 24 h and reduces 20° gloss by 6–10 units in a black basecoat. The screening addition range is 0.05–0.5 wt% of total formulation; crater-free flow over corona-treated polyethylene terephthalate is reached at 0.08–0.15 wt%, while loadings above 0.30 wt% begin to soften intercoat adhesion in two-pack isocyanate-cured systems when tested by cross-cut according to ISO 2409:2020. In high-PVC interior wall paints formulated at 78–82% PVC, the silicone polyether lowers equilibrium surface tension to 24–26 mN/m at 0.1 wt%; however, flooding and floating may increase if the primary pigment wetting agent is an ammonium salt of a low-molecular-weight polyacrylate and the pigment dispersion was not fully stabilised. Downstream processes include horizontal bead mills for pigment dispersion, high-speed dissolvers, and cartridge filtration to 10–25 µm before filling; the additive should be added after the final viscosity adjustment to avoid shear-induced defoamer destabilisation and should be evaluated for heat-age stability at 50 °C for 14 days because silicone polyethers can slowly partition into the aqueous phase and increase runoff marks on vertical surfaces. Compliance for architectural coatings within the EU rests on Directive 2004/42/EC with a ready-to-use VOC ceiling of 30 g/L for matt wall paints; indirect food-contact packaging inks and overprint varnishes require migration assessment under EU 1935/2004 or FDA 21 CFR 175.300. Terminal product types include waterborne trim enamels, exterior wood stains, flexographic and gravure lamination inks, and anti-graffiti clear coats.
When RH-SPE-193HP is used as a PEG-modified siloxane copolyol in leave-on skin emulsions, the practical addition window is 0.2–1.5% w/w for oil-in-water lotions and 0.5–2.0% w/w for water-in-silicone creams; the precise level is governed by the required mean droplet diameter of 2–8 µm after rotor-stator homogenisation at 5 000–8 000 rpm as measured by laser diffraction under ISO 13320:2020 and by centrifuge stability at 3 000 min⁻¹ for 30 min. In heated oil phases containing sorbitan laurate or cetearyl alcohol, the fluid is pre-dissolved at 60–70 °C before emulsification; in cold-process systems it is introduced into the glycerin phase to avoid local gel particles and phase inversion during the early dilution stage. Electrolyte compatibility drops when sodium chloride exceeds 0.5% w/w or when the water phase contains more than 15% w/w ethanol; clouding can appear within 48 h under these conditions, requiring rebalancing of the co-emulsifier or a reduction in the silicone copolyol level. Stable low-viscosity sprayable emulsions are obtained at the lower addition boundary, while the upper boundary is needed in high-titanium-dioxide mineral sunscreens where 0.6% w/w improves pigment wetting and prevents visible aggregate streaks during rub-out and after 10-cycle thermal cycling between 4 °C and 40 °C. Compliance for the cosmetic product is handled through the cosmetic product safety report under EC No 1223/2009; the silicone polyether must be covered by the formula-specific safety assessment, and microbiological challenge testing follows ISO 17516:2014. Terminal products include sprayable body lotions, cold-cream emulsions, hair conditioners, and mineral sunscreen lotions.
Tank-mix evaluation of RH-SPE-193HP in a glyphosate potassium or mesotrione spray solution at 0.025–0.15% v/v is conducted with TeeJet XR11003 flat-fan nozzles at 2.0–2.5 bar and water volumes of 100–150 L/ha; droplet retention on Setaria viridis leaves increases when dynamic surface tension at 100 ms bubble lifetime falls below 30 mN/m, a threshold reached at 0.05% v/v in deionized water but lost in hard water beyond 300 ppm CaCO₃ equivalent unless a citric acid or AMS water conditioner is used. The fluid operates as a spreading adjuvant within an aqueous solution or suspo-emulsion, not as a pesticide active; its use in a registered formulation is evaluated under REACH Regulation (EC) No 1907/2006 data requirements and, for inert use in the United States, against 40 CFR 180.920 tolerance-exempt list criteria for the specific polymer composition. Downstream production starts with dilution of a soluble concentrate in softened water, followed by induction into the spray tank under agitation of 300–500 rpm; pre-mixing in a separate carrier before adding the active ingredient reduces phase separation in high-load suspension concentrates above 500 g/L active ingredient and prevents emulsion inversion shock when the formulation contains high electrolyte salts. Recirculating sprayers with return-line flow rates above 40 L/min can produce persistent foam, so a low-foam version or antifoam may be required. Terminal product types include contact and systemic herbicide formulations, fungicide tank mixtures, and turf wetting agents; spray drift control trials should compare droplet size spectra with and without the adjuvant under ISO 22856:2008 to avoid fine droplet fractions below 150 µm that are prone to drift.
On a Kusters padder operating at 1.8–2.2 bar nip pressure and 60–80% wet pickup on bleached cotton interlock, RH-SPE-193HP is applied at 1–5 g/L in a bath buffered to pH 5.0–5.5 with acetic or citric acid. The padded fabric is dried and conditioned on a stenter frame at 130–150 °C for 60–90 s; if the fabric temperature exceeds 170 °C, the polyether side chains oxidatively degrade and the treated cotton loses the hydrophilic character that distinguishes PEG-modified silicone fluids from conventional aminofunctional dimethyl siloxane softeners. Drop absorption time is tested under AATCC TM79; values below 3 s are targeted for sportswear, but washing under ISO 6330:2021 reveals that single-component finishes lose most rewetting benefit after 10 cycles unless a polyurethane binder is co-applied at 2–5 g/L. The pad liquor must remain clear for at least 8 h because silicone polyether fluids can agglomerate at low pH or high water hardness; filtration through a 50 µm mesh before the trough prevents streaks from coagulated microdroplets. Continuous padder runs above 40 m/min can entrain air at the nip, and a defoamer may be needed if surface foam builds beyond 5 mm in the trough. Chemical input compliance for textile finishing is verified against ZDHC MRSL v3.1, OEKO-TEX Standard 100 Annex 4 Class II, and bluesign BSSL; residual cyclic siloxane content is assessed through brand-specific RSL testing when the finished article is exported to EU markets. Terminal products include cotton and cotton-spandex activewear, underwear, towelling, and nonwoven hygiene topsheet finishes.
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PEG Silicone Fluid RH-SPE-193HP is a polyethylene glycol-modified polydimethylsiloxane copolymer supplied as a clear, medium-viscosity liquid for aqueous and nonaqueous formulation systems. In manufacturer batch records, the trade designation RH-SPE-193HP denotes a high-purity grade; the appended “HP” refers to reduced free water and low cyclic siloxane carryover, not to an official monographed purity class. Routine release testing for this product class employs kinematic viscosity at 25°C by ASTM D445, water content by ASTM D6304, pH by ASTM E70 in a 5% isopropanol-water dispersion, refractive index at 25°C by ASTM D1218, and specific gravity at 25°C by ASTM D4052. Because published product-specific data for RH-SPE-193HP remains limited to vendor technical bulletins, the control ranges in Table 1 are representative of high-purity PEG silicone fluids of this viscosity class and should not replace the lot certificate of analysis.
| Parameter | Reference Method | Representative Control Range |
|---|---|---|
| Appearance | Visual | Clear to slightly hazy liquid |
| Kinematic viscosity at 25°C | ASTM D445 / ISO 3104 | 500–1500 mm²/s |
| Specific gravity at 25°C | ASTM D4052 / ISO 12185 | 1.010–1.040 |
| Refractive index at 25°C | ASTM D1218 | 1.4400–1.4550 |
| Water content | ASTM D6304 | ≤0.10% |
| pH, 5% in 1:1 IPA-water | ASTM E70 | 5.0–7.5 |
| Active content | FTIR polyether:siloxane ratio | ≥99.0% |
The active content measurement is not based on a single universal compendial method; it is calculated from the organofunctional polyether:siloxane ratio using the supplier’s calibrated Fourier-transform infrared method. The product is a nonionic polymer, and its specification does not include an ionic HLB titration endpoint.
Unmodified polydimethylsiloxane fluids are hydrophobic, immiscible in water, and function primarily as release agents or foam control additives. PEG Silicone Fluid RH-SPE-193HP differs by incorporation of polar polyethylene glycol grafts onto the siloxane backbone; this structural change converts the polymer into a nonionic, water-dispersible surface-active copolymer without requiring external emulsifiers. Under dynamic wetting-load tests conducted with maximum bubble pressure tensiometry, polyether siloxanes with medium-length ethoxylate pendants typically reduce surface tension more rapidly than conventional linear alcohol ethoxylates or alkylphenol ethoxylates. Direct substitution of a 100 cSt polydimethylsiloxane with RH-SPE-193HP in an aqueous spray adjuvant changes the phase from unstable oil slick to translucent microemulsion and moves the measured contact angle on paraffin film from hydrophobic to strongly wetting regimes when tested by ASTM D5946.
The second difference is hydrolytic behavior. Dimethicone fluids are generally stable to hydrolysis; polyether siloxanes, however, contain Si–O–C or Si–C linkages depending on synthesis. RH-SPE-193HP is intended for pH ranges between 4.0 and 9.0; outside this range, especially in strongly acidic or alkaline packages, gradual hydrolysis of the polyether linkage may reduce surface activity. This is a critical processing boundary compared with non-PEG silicone fluids that can tolerate broader pH exposure.
A third difference appears in foam behavior. Linear polydimethylsiloxane often functions as a defoamer; RH-SPE-193HP can act as a moderate foam stabilizer in polyurethane systems and as a low-foam wetting agent in aqueous alkaline cleaners. The net foam response is formulation-specific and must be evaluated by ASTM D1173 or equivalent dynamic foam half-life measurements. Compared with other organosilicone surfactants bearing longer alkyl or polyether chains, RH-SPE-193HP occupies a middle hydrophilic-lipophilic balance position between wetting-only trisiloxane surfactants and high-HLB emulsifying silicone polyethers. This middle position allows use in both wetting and secondary emulsion stabilization tasks, while reducing solubility in pure oils compared with all-PDMS fluids.
Agricultural tank mix screening with RH-SPE-193HP typically begins with dynamic surface tension measurement because spray impingement and leaf wetting on waxy crops are determined more by short-time surface tension than by equilibrium values. In a standard glyphosate formulation containing ammonium sulfate at 4% w/w, a nonionic PEG silicone adjuvant must remain soluble or finely dispersible at pH 4.5–5.5. RH-SPE-193HP is added at 0.05–0.15% v/v in the diluted spray mixture, but exact use concentration depends on target weed morphology and local water hardness. High electrolyte loads reduce the cloud point of many polyether silicones; therefore, tank-mix compatibility with calcium chloride or ammonium sulfate brines should be checked at the lowest expected use temperature.
Droplet spread factor on waterproof paper may be evaluated with a calibrated droplet imaging system; published data for this specific configuration is limited. Batch-to-batch variance in agricultural adjuvant performance is most often traced to residual water and low-molecular-weight cyclosiloxane content. For RH-SPE-193HP, the low water specification and high-purity designation are intended to reduce this variance. During field-tank agitation, shear is low; therefore the primary failure mode is additive precipitation or oiling out, not high-shear degradation. Operators should predilute RH-SPE-193HP in water before adding high-load electrolytes; adding the concentrate directly into a saturated ammonium sulfate stock can cause local gel formation at the injection point.
In waterborne acrylic-alkyd hybrid coatings, RH-SPE-193HP is evaluated as a substrate wetting and emulsion stabilizer, not as a primary emulsifier. The product should be incorporated during the letdown stage after the grind phase. Cowles blade dispersion at 3–5 m/s tip speed is usually sufficient; prolonged high-shear circulation after polymer addition can increase foam and shift the droplet size distribution. Addition levels are commonly screened from 0.10% to 0.50% on total formulation weight. Above 0.70%, the risk of foam stabilization and water sensitivity of the cured film increases markedly, making the effective processing window narrow.
Water sensitivity is evaluated by spot testing cured films with 1-mL water droplets for 24 h under ISO 2812-3. Static contact angle on steel and aluminum substrates can be measured by ASTM D5946 before and after additive addition. Compared with alkylphenol ethoxylate wetting agents, RH-SPE-193HP imparts lower equilibrium surface tension and reduces surface defects without the same degree of low-shear foam stabilization; however, its use above the threshold may require a silicone-free defoamer. Do not combine with amine-functional silicone release agents without compatibility testing; basic amines can accelerate polyether cleavage.
During continuous pour line trials of flexible polyether slabstock foam, PEG silicone fluid function is judged by cell count, cell size uniformity, and rise profile stability. RH-SPE-193HP is introduced into the resin blend at 0.8–1.2 parts per hundred polyol, where it stabilizes incipient foam cells against coalescence while maintaining open-cell character at the end of rise. The polyether chain length and silicone content of a foam-stabilizing silicone govern nucleation density and frothing at the mix head; a medium-to-high polyether modification such as that indicated for RH-SPE-193HP generally promotes fine cell dispersion and uniform airflow without excessive closed cells. Physical testing follows ASTM D3574-17, with airflow and compression set used as sensitive indicators of surfactant overuse.
On high-output low-pressure foaming lines, short mix-head residence times require rapid surfactant migration to the gas-liquid interface; therefore, viscosity and low-temperature flow are significant. RH-SPE-193HP should be stored above 5°C to avoid viscosity rise and metering pump cavitation. When the product is substituted into an existing polyether silicone grade, the mixing head pressure and pour line silicone flow rate should be checked because differences in polyether content can alter the nucleation point and top foam porosity.
PEG silicone fluids in personal care emulsions are selected for a balance between siloxane skin feel, hydrophilic wash-off, and process emulsification efficiency. RH-SPE-193HP is tested in low-energy cold-process formulations as a secondary emulsifier with conventional nonionic primary emulsifiers. At 0.5–2.0% use in oil-in-water lotions, it can lower interfacial tension and contribute to a fine droplet size distribution; droplet size is monitored by laser diffraction after 24 h at 45°C. Visual stability is assessed according to ISO 22716:2007 manufacturing controls rather than a single product stability standard.
Because of the polyether moiety, finished emulsions should be kept between pH 4.0 and 9.0 and should avoid prolonged exposure to strong oxidizing agents. Heat exposure above 80°C for more than 24 h can increase yellowing and reduce wetting activity. Sensory panel evaluations under standard conditions indicate a light, less tacky after-feel than high-viscosity dimethiconol blends; however, published data for RH-SPE-193HP in this specific sensory configuration is limited and should be reconfirmed on the final emulsion base.
In semi-synthetic metalworking fluid concentrates, RH-SPE-193HP functions as a low-foam wetting agent and boundary-lubricity enhancer when the concentrate contains 30–40% mineral oil and an alkanolamine-corrosion inhibitor package. It is introduced after the phosphate ester extreme-pressure additive and before the biocide, because premature addition to the amine phase can create localized high-viscosity regions and reduce pump transfer efficiency. The product is evaluated in a four-ball extreme-pressure test according to ASTM D2783 and in an instrumented tapping torque bench test; improvement is usually expressed as torque reduction at defined feed rate and hole size. In high-pressure coolant delivery above 70 bar, low foam is critical.
Polyether silicones can degrade foam stability of the base oil, but they also reduce surface tension and enhance spreading on ferrous workpieces; the net effect is dose-dependent. Addition levels beyond 0.20% actives in the diluted fluid may increase foam half-life measured by ASTM D1173 enough to require a defoamer adjustment. The product should not be considered a complete replacement for sulfurized or phosphorus-based extreme-pressure agents; its function is wetting and lubricity retention under boundary friction conditions, not bulk metal removal chemistry.
Manufacturing experience with silicone polyether fluids shows that the main chemical degradation pathway for RH-SPE-193HP is hydrolytic cleavage of the polyether-siloxane linkage, which is accelerated by acidic environments and elevated temperature. Storage and processing should remain within pH 4.0–9.0; excursions below pH 3.0 or above pH 10.0 at temperatures above 60°C are not recommended. In organic solvent-based systems, the fluid is compatible with alcohols, glycol ethers, and aliphatic hydrocarbons, but high concentrations of concentrated mineral acids or strong oxidizing agents should be avoided.
Unopened containers should be stored at 5–40°C in sealed vessels to maintain water content below specification. Avoid prolonged contact with unlined carbon steel in aqueous concentrates; stainless steel 316L or high-density polyethylene is preferred for bulk storage tanks. Any product exposed to freezing should be gently rehomogenized at room temperature and checked for clarity before use.
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