| HS Code | 259490 |
| Product Name | Silicone Leveling Agent RH-T1033A |
| Chemical Composition | Polyether-modified polysiloxane |
| Appearance | Colorless to pale yellow transparent liquid |
| Active Content | ≥99% |
| Density 25 C | 0.98-1.02 g/cm³ |
| Viscosity 25 C | 50-1000 mPa·s |
| Refractive Index 25 C | 1.430-1.450 |
| Ionicity | Nonionic |
| Solubility | Soluble in aromatic hydrocarbons, esters, and ketones |
| Recommended Dosage | 0.1-1.0% of total formulation weight |
| Flash Point | >100°C |
| Shelf Life | 12 months in unopened packaging |
| Storage | Cool, dry, ventilated place; avoid direct sunlight |
| Packaging | 25 kg/drum or 200 kg/drum |
As an accredited Silicone Leveling Agent RH-T1033A factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | RH-T1033A is supplied in 25 kg plastic drums or 200 kg drums with inner liners, suitable for safe storage and transport. |
| Container Loading (20′ FCL) | 20′ FCL container loading for Silicone Leveling Agent RH-T1033A, with properly packaged, labeled, and secured cargo for shipment. |
| Shipping | Silicone Leveling Agent RH-T1033A is shipped in sealed 25 kg plastic drums or 200 kg/IBC totes. Keep containers closed and store in a cool, dry, ventilated area away from sunlight, freezing, and extreme heat. Confirm SDS hazard classification before transport and include required labels and shipping documents. |
| Storage | Store Silicone Leveling Agent RH-T1033A in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly closed when not in use to prevent contamination and moisture ingress. Avoid contact with incompatible chemicals. Protect from freezing and extreme temperatures. Maintain clear labels and ensure SDS access. Follow local regulations. |
| Shelf Life | Silicone Leveling Agent RH-T1033A typically has a shelf life of 12 months in its original sealed container under recommended storage conditions. |
Solventborne alkyd-melamine baking enamels applied by electrostatic bell or conventional air spray to zinc-phosphated steel are compounded with polyether-modified polydimethylsiloxane RH-T1033A at 0.2–0.5 wt% of total formulation to suppress Benard-cell-driven cratering and orange peel during forced flash at 80–120°C. The additive is introduced after pigment dispersion and before final viscosity adjustment; on production lines using a high-speed disperser with tip speed 15–20 m/s, post-addition mixing of 10–15 min is sufficient to produce uniform surface tension reduction without generating silicone-rich droplets visible as fisheyes after bake. Bake schedules for coil and general industrial coatings typically range from 20 min at 140°C to 10 min at 165°C. The critical upper limit is 0.5 wt%; above this level, cured film surface energy can drop below 22 mN/m, and recoatability declines when measured by cross-cut adhesion per ASTM D3359-17, especially when a waterborne acrylic topcoat is applied over the aged enamel. Compliance for food-contact metal packaging references FDA 21 CFR 175.300 resinous and polymeric coatings; industrial solventborne coatings fall under EU Directive 2004/42/EC volatile organic compound limits, although the silicone additive itself does not contribute measurable VOC under ISO 11890-2:2020. Terminal finished product types include coil-coated appliance side panels, two-piece can exterior basecoats, and metal office furniture where gloss measured at 20° per ISO 2813:2014 must remain above 85 GU after 1,000 h neutral salt spray testing per ISO 9227:2022.
The let-down phase of waterborne acrylic-polyurethane wood topcoats requires addition of RH-T1033A at 0.3–0.8 wt% of total formulation after the associative polyurethane thickener has been fully hydrated, because direct addition into the pigment grind can lead to adsorption onto latex particle surfaces and later intercoat adhesion loss. Mixing is conducted in a dissolver at 8–12 m/s tip speed for 10–15 min; post-addition of the additive into an already thickened batch can produce visible microfoam that persists after 24 h because the silicone lowers lamella elasticity. The additive shifts static surface tension from approximately 38 mN/m to 24–26 mN/m and reduces edge crawling and picture-frame defects on oak and beech veneer at applied wet film weights of 80–120 g/m². Above 0.8 wt%, full-gloss systems can develop haze, with 20° gloss falling by more than 50 GU under ISO 2813:2014, and sanding between coats becomes tacky because the silicone-enriched surface plasticizes the upper stratum. Industry compliance for children's furniture uses EN 71-3:2019+A1:2021 migration limits for certain elements; general industrial wood coatings are evaluated against DIN 68861-1:2011 chemical resistance and REACH Annex XVII restrictions. Finished goods include waterborne lacquers for flat-pack office desktops, engineered wood flooring topcoats, and children's chair finishes.
UV-curable overprint varnishes and lithographic inks processed on three-roll mills or closed horizontal bead mills demand a narrower addition range for RH-T1033A than thermally cured coatings: 0.05–0.3 wt% of total formulation. The additive is incorporated before final filtration through 5 µm absolute filter bags, but not into the pigment grind for inks, because high mill-base temperatures above 60°C can accelerate siloxane migration to the mill chamber and produce roller stripping. Curing uses medium-pressure mercury or gallium-doped arc lamps with peak irradiance 1.0–1.5 W/cm² and total UV dose 80–120 mJ/cm²; at belt speeds above 100 m/min, the leveling effect is reduced unless the varnish temperature is maintained above 25°C to lower viscosity. The principal process conflict is post-print foil stamping and lamination: above 0.3 wt%, the cured surface energy falls sufficiently to reduce foil adhesion, and peel strength drops below 2.5 N/15 mm when measured according to ASTM D1876-08(2015)e1. Compliance for food-contact printed matter follows EU Regulation (EC) No 1935/2004 and Swiss Ordinance SR 817.023.21; low-migration varnishes are assessed by ISO 28360 for volatile organic compounds in printing. Terminal products include UV-varnished folding cartons for confectionery, pressure-sensitive label overprint varnish, and inline-decorated cosmetic cartons.
Amine-cured epoxy high-build floor coatings applied by notched squeegee and back-rolling at wet film thicknesses of 250–500 µm incorporate RH-T1033A at 0.1–0.4 wt% of the base component during pigment dispersion, not after the amine hardener is mixed, to avoid competitive adsorption at the hardener-water interface that can occur under curing conditions above 85% RH and produce amine blush. The formulated product is often dispensed through plural-component spray equipment with a static mixer of 24–32 elements; the silicone suppresses crawling over mechanically prepared concrete characterized by CSP 3–5 surface profiles according to ICRI Guideline 310.2R-2013. It also reduces cratering caused by the release of entrapped air during spike rolling. Because the epoxy matrix cures by step-growth polymerization between bisphenol A diglycidyl ether and aliphatic or cycloaliphatic amines, the silicone does not enter the crosslink network but concentrates at the air interface; above 0.4 wt%, intercoat adhesion before applying polyurethane topcoats declines when measured by pull-off adhesion per ASTM D7234-19. Compliance for commercial flooring systems references ISO 15184:2020 for coating adhesion, EN 13813:2002 for screed materials and floor coatings, and REACH registration dossiers. Terminal finished goods include car park deck coatings, pharmaceutical cleanroom floors, and warehouse wear slabs subject to EN 13892-4:2002 abrasion resistance classification.
Polyester-epoxy hybrid powder coatings cured at 160–180°C exhibit flow modulation when RH-T1033A is incorporated at 0.2–0.8 wt% of total formulation during premix blending before melt extrusion; post-extrusion dry blending is avoided because localized silicone-rich particles cause pinholes and gloss reduction. The production process uses a twin-screw extruder with L/D ratio 15:1–18:1, barrel temperature 90–110°C, screw speed 400–600 rpm, and a chill roll set to 15–20°C; the resulting flake is ground in an ACM mill and classified to a particle size distribution with D50 35–45 µm. The silicone reduces surface tension gradients during oven flow, allowing edge coverage on sharp-radius aluminum extrusions without excessive flow that causes sagging at coating weights above 80 µm. At levels above 0.8 wt%, cured film hardness can shift from H to HB when tested by ISO 15184:2020, and clear coats develop haze because the siloxane segregates into discrete domains during the melt phase. Compliance for architectural powder coating follows Qualicoat Specifications 2022 for aluminum profiles and AAMA 2604 for high-performance organic coatings; dry-film thickness measurement is performed by ISO 2360:2017. Terminal product categories include powder-coated aluminum window profiles, domestic appliance side panels, and retail steel shelving units.
The interface accumulation kinetics of RH-T1033A in solvent-based gravure and flexographic inks formulated with acetyl tributyl citrate or dioctyl adipate plasticizers control both leveling and downstream lamination performance. The additive is introduced at 0.1–0.3 wt% of finished ink during let-down after nitrocellulose or polyvinyl butyral binder dispersion and before final solvent adjustment to a printing viscosity of 18–25 s on a DIN 4 mm cup. On rotogravure presses running at 150–300 m/min with electrostatically assisted ink transfer, this addition suppresses retraction craters on corona-treated polyethylene and polypropylene films whose surface energy is maintained above 38 mN/m after inline treatment. Above 0.3 wt%, heat-seal strength in unprinted margins can fall below 30 N/25 mm when measured by ASTM F88/F88M-21, and lamination bond strength to polyethylene terephthalate film declines in standard polyurethane adhesive dry lamination. Specific phase-separation data for RH-T1033A in high-ethanol flexo formulations is limited; however, phase separation has been reported for some polyether-modified siloxanes in flexo formulations containing more than 30% ethanol by mass at storage temperatures below 5°C. Therefore, the additive is pre-dispersed in a compatible ester solvent before addition in high-ethanol systems. Compliance for food packaging inks follows EuPIA Good Manufacturing Practice for Printing Inks and EU Regulation (EC) No 1935/2004; overall and specific migration testing is conducted according to EN 1186-1:2002 and subsequent parts. Finished goods include snack food wrappers, stand-up pouches, and shrink-sleeve labels.
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Product RH-T1033A is supplied as a polyether-modified polydimethylsiloxane copolymer intended for surface-tension equalization in solventborne and waterborne coating formulations. The model designation denotes a medium-polarity silicone leveling agent rather than an unmodified dimethyl silicone fluid; the polyether grafts provide compatibility with acrylic, polyester, alkyd, epoxy, and polyurethane binders while the siloxane backbone retains rapid interfacial migration. Incoming inspection for this product class is normally controlled for nonvolatile content by ISO 3251:2019, density by ISO 2811-1:2016, dynamic viscosity by ISO 3219:2019, and refractive index by ISO 280:2019. Because published data for RH-T1033A specifically is limited, the numerical envelope that follows is class-level technical guidance; exact lot values must be confirmed against the manufacturer’s certificate of analysis.
The primary function of RH-T1033A is to reduce surface-tension gradients across the wet film during flash-off and early oven cure. In solventborne alkyd and polyester/melamine enamels, surface-tension differences among resin, solvent, and pigment wetting agents are recurring causes of cratering, edge creeping, and orange peel. The additive migrates to the liquid-air interface and moderates Marangoni-driven flow; performance is commonly assessed by 20° gloss per ASTM D523-14, distinctness of image per ASTM D5767-18, and leveling by ASTM D4062-16. Addition levels from 0.05% to 0.5% of total formula mass are typical: the lower bound addresses microdefects in low-film-thickness clears, while the upper bound is reserved for highly pigmented industrial coatings where slip and leveling must be balanced against recoatability. The product does not function by reducing bulk viscosity; at the low addition levels used, resin solution viscosity measured at 25°C under ISO 3219:2019 generally remains unchanged within ±3%.
At addition levels above 0.8% of total coating mass, the siloxane phase saturates the liquid-air interface and can form a separate low-viscosity layer that persists after bake. Static surface tension may drop below 22 mN/m in solventborne polyester/melamine clearcoats, but film defects often become more probable rather than less: excess silicone can destabilize the film surface, generate local surface-tension collapse craters, stabilize microfoam, and reduce intercoat adhesion. In a two-component polyurethane topcoat cured at 60°C for 30 minutes, cross-cut adhesion per ISO 2409:2020 has been observed to shift from class 0 to class 2 when unmodified dimethyl silicone is overdosed; polyether-modified products delay this failure but do not eliminate it at extreme addition. The upper limit for RH-T1033A should be established by recoatability testing after sanding and solvent wiping, not solely by initial gloss. For air-assisted airless spray application at 30–40 µm dry film thickness, the practical ceiling before intercoat adhesion and haze onset exceed acceptable limits is typically 0.3%–0.5%. Foam stabilization above 0.5% may be measured as an increase in wet-film bubble count after 5 minutes; deaeration time in a vacuum dissolver is more useful than rotational viscometry for quantifying this effect.
Separate from total dosage, the addition temperature matters. At vessel temperatures above 40°C, a polyether-modified siloxane may phase-separate in low-aromatic solvents, causing haze that is not reversible by subsequent cooling. The processing window should therefore be held at 25–35°C for solventborne formulations; if the batch must be heated to reduce viscosity, the additive is introduced after cooling below 40°C. In waterborne acrylic dispersions neutralized above pH 9, polyether-siloxane hydrolysis can accelerate during storage; the practical working zone is pH 7–9, with storage stability trials run under ASTM D1849 or an equivalent accelerated shelf-life method before finalizing the buffering package.
Plant-scale addition sequence influences final surface quality. The additive is best introduced after grind let-down and before final rheology adjustment, under low shear in a vessel equipped with an anchor or propeller agitator. If added during pigment dispersion in a high-shear rotor-stator or a high-speed dissolver above 25 m/s tip speed, the siloxane can be mechanically sheared and may generate stable foam; the disperser vortex can collapse, and the batch can retain microfoam through filling. In aluminum pigment basecoats, RH-T1033A is added after the aluminum slurry to avoid interfering with flake wetting and leafing. For waterborne acrylic emulsions, premixing with a glycol ether cosolvent before let-down reduces shock and improves distribution in the aqueous phase. Laboratory drawdowns on cold-rolled steel and polyethylene terephthalate substrates at 25 µm wet-film thickness are used to confirm surface defect suppression before a 200–1,000 L pilot batch is authorized. Batch-to-batch variation in the additive as supplied can shift effective active content if solvent loss occurs during storage; a container opened repeatedly at high ambient humidity may show viscosity increase of 10%–20% within 6 months. This is not necessarily a failure, but dosing should be corrected by nonvolatile content.
Table 1 lists the class-level incoming inspection envelope used for polyether-modified silicone leveling agents of the RH-T1033A type. The values are representative for solvent-free or reduced-solvent organosilicones and must be verified against the product’s technical data sheet.
| Property | Test method | Typical acceptance range |
|---|---|---|
| Appearance at 25°C | Visual against a white background | Clear to slight haze, free of gel particles |
| Nonvolatile content, 1 h, 105°C | ISO 3251:2019 | 25%–100% depending on solvent cut; high-active grades ≥90% |
| Density at 25°C | ISO 2811-1:2016 | 0.95–1.05 g/cm³ |
| Dynamic viscosity at 25°C | ISO 3219:2019 | 50–1,500 mPa·s for as-supplied liquid |
| Refractive index at 25°C | ISO 280:2019 | 1.440–1.460 for solvent-free polyether-siloxanes |
| Surface tension, 0.1% active in water, 25°C | ASTM D1331-14 | 20–24 mN/m |
| Flash point | ISO 1523:2002 or ISO 3679 | >40°C or >60°C depending on solvent content |
Each lot should be checked for refractive index and active content; a refractive-index deviation greater than ±0.002 from the reference lot can indicate solvent loss, oxidation, or siloxane rearrangement. Viscosity drift above ±10% from the reference lot should trigger re-standardization on active content rather than as-supplied weight. Under REACH and RoHS, the product is supplied as a mixture; the safety data sheet should be reviewed for substance-volume thresholds and any applicable restriction codes before use in exported or food-contact-adjacent coatings.
Polyacrylate leveling agents reduce surface tension only moderately and act primarily by increasing the mobility of the binder-rich surface layer. Silicone leveling agents such as RH-T1033A lower the static surface tension more strongly and can wet contaminated substrates, but at the possible expense of intercoat adhesion when used above 0.5%. Fluorocarbon surfactants produce the lowest surface tension, in the 18–22 mN/m range in organic solvents, but can destabilize foam and are less compatible with medium-polarity polyester/melamine systems. Table 2 compares the three classes for a solventborne automotive basecoat/clearcoat stack.
| Parameter | Polyether-modified silicone, RH-T1033A class | Polyacrylate leveling agent | Fluorocarbon surfactant |
|---|---|---|---|
| Static surface tension at 0.1 wt% in xylene, 25°C per ASTM D1331-14 | 22–26 mN/m | 26–30 mN/m | 18–22 mN/m |
| Typical use level in total formula | 0.05%–0.5% | 0.2%–1.0% | 0.01%–0.1% |
| Recoatability after bake | Moderate at >0.5%; pass at 0.1%–0.3% | Good | Poor if overdosed |
| Foam tendency in air-assisted spray | Moderate | Low | High |
| Slip modification at 0.2% | Marked | Negligible | Low |
| Migration rate to interface | Rapid, siloxane backbone | Slower, controlled by molecular weight | Rapid |
The central difference in use is that RH-T1033A can provide leveling and slip modification in a single additive, whereas polyacrylates are selected when recoatability and non-silicone specifications are mandatory. In automotive basecoat systems that will receive a waterborne topcoat, silicone content is often restricted because trace contamination can produce craters in the subsequent aqueous layer. If a polyacrylate leveling agent at 0.5% passes a tape adhesion test but fails to suppress edge crawling, a side-by-side trial with RH-T1033A at 0.2% may be technically justified; the addition must be revalidated after sanding if a repair cycle is involved. Published data for RH-T1033A in this specific automotive configuration is limited; laboratory confirmation is required before production use. Relative to unmodified dimethylpolysiloxane, polyether modification increases the critical surface tension and reduces the tendency to form fisheyes on polar substrates. Unmodified fluids at 0.1% in a medium-oil alkyd can produce severe cratering and are generally not used as leveling agents. The polyether chain also provides limited emulsification behavior in waterborne systems; however, RH-T1033A is not a primary substrate wetting agent. Wetting of low-energy substrates such as polyethylene or polypropylene remains limited, and a fluorosurfactant may be required if the substrate surface tension is below 30 mN/m.
RH-T1033A is not a defoamer and should not be used as the sole air-release additive in high-build epoxy or polyurethane systems. In solvent-free epoxy primers applied at 200–500 µm wet-film thickness, a polyether-modified silicone leveling agent can improve flow and surface smoothness, but it can also stabilize foam generated by the amine curing agent and by porous substrate outgassing. Air release requires a separate defoamer or deaerating agent with limited incompatibility; the two additives must be added at different stages because simultaneous addition can cause haze and crawling. In a solvent-free epoxy floor coating applied by squeegee and back-rolled, formulation trials should measure wet-film bubble retention after 5 minutes and dry-film pinhole count at 100 µm DFT; the leveling agent addition is held constant at 0.1%–0.2% while the defoamer is varied. Published data for RH-T1033A in this exact configuration is limited; laboratory confirmation is required.
Storage at 5–35°C in sealed containers is recommended. The material should not be exposed to atmospheric moisture for prolonged periods because siloxane hydrolysis can shift viscosity and reduce active content. The product should not be blended with concentrated acidic catalysts below pH 3 or with strongly basic amine solutions above pH 10; such extremes can accelerate siloxane rearrangement. In waterborne systems, alkaline pH buffering with volatile amines may shorten the storage stability of the siloxane if the formulation is stored above 40°C. For direct food-contact, potable-water, or medical-substrate coatings, regulatory suitability must be confirmed separately; RH-T1033A is not presumed compliant with FDA 21 CFR 175.300 or equivalent food-contact provisions unless the manufacturer’s written compliance statement is obtained.
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