| HS Code | 355256 |
| Product Name | Silicone Leveling Agent RH-T1006N |
| Product Type | Silicone leveling agent |
| Chemical Composition | Polyether-modified polysiloxane |
| Appearance | Light yellow transparent liquid |
| Active Content | 100% |
| Viscosity At 25 C | 100–500 mPa·s |
| Density At 25 C | 1.00–1.05 g/cm³ |
| Refractive Index At 25 C | 1.430–1.450 |
| Flash Point | >100°C |
| Ionicity | Nonionic |
| Solubility | Soluble in aromatic, aliphatic, and ester solvents; insoluble in water |
| Recommended Dosage | 0.1–1.0% based on total formulation |
| Application | Solvent-based coatings, inks, and adhesives |
| Storage Conditions | Store in a cool, dry, ventilated place; avoid direct sunlight |
| Shelf Life | 12 months in unopened original packaging |
| Packaging | 25 kg/drum or 200 kg/drum |
As an accredited Silicone Leveling Agent RH-T1006N factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Silicone Leveling Agent RH-T1006N is supplied in 25 kg plastic drums, each securely sealed for safe transport and storage. |
| Container Loading (20′ FCL) | Silicone Leveling Agent RH-T1006N is loaded in a 20′ FCL container, securely packaged with proper labeling and moisture protection for transport. |
| Shipping | Silicone Leveling Agent RH-T1006N is supplied in sealed drums or containers and shipped via standard industrial chemical transport. Keep containers closed, store in a cool, dry, ventilated area, protect from moisture and contamination, and follow local regulations and the accompanying SDS. Handle in accordance with manufacturer instructions. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition. Keep containers tightly closed and properly labeled when not in use. Prevent freezing and protect from moisture and contamination. Separate from strong acids, alkalis, and oxidizing agents. Observe good industrial hygiene and local regulations. Use appropriate secondary containment to prevent spills. |
| Shelf Life | Shelf life is approximately 12 months from manufacture when stored unopened in a cool, dry, well-ventilated place away from sunlight. |
On automotive OEM topcoat lines operating with two-component acrylic-polyurethane clearcoats at dry film thicknesses of 40–50 µm, surface defects such as craters, pinholes, and long-wave orange peel are induced by silicone contamination, fiber particles, and localized low surface energy at the wet film-air interface. RH-T1006N, a polyether-modified polydimethylsiloxane leveling agent, is introduced during the let-down stage at 0.05–0.20 wt% on total formulation, not during pigment grinding, because adsorption onto dispersed pigment surfaces generates batch-to-batch variation in available surface-active species. Addition is made after the clearcoat has been reduced to spray viscosity, typically 22–28 s DIN 4 mm at 23 °C, and after the polyisocyanate hardener has been mixed for 30–60 s under low-shear agitation. Production-scale application uses high-speed rotary bell atomizers rotating at 30,000–60,000 rpm, booth air flow of 0.3–0.5 m/s, and a 5–8 min flash-off at 23–25 °C before a 20–30 min oven cure reaching 140–150 °C panel surface temperature. The additive reduces surface tension gradients that drive Marangoni flow, with surface tension values for this product class, measurable by Wilhelmy plate tensiometry according to DIN EN 14370:2004, typically decreasing from approximately 28 mN/m to 22–24 mN/m at use levels above 0.1 wt%. Compliance in this segment is tied to ASTM D4062-12(2019) leveling ratings, ISO 2813:2014 specular gloss at 20° and 60°, ASTM D5767-18 distinctness of image, and ASTM D3359-17 cross-cut adhesion with a target of 5B after 10 days at 23 °C. Finished product types include OEM monocoat and clearcoat-over-basecoat systems for passenger cars, light commercial vehicles, and electric vehicle body panels. Published data for RH-T1006N in OEM clearcoats with high aluminum substrate ratios is limited; line trial validation under production airflow and electrostatic conditions is required before full-scale adoption.
High-volume furniture finishing plants applying waterborne two-component polyurethane topcoats at 18–25 °C and 45–65% relative humidity encounter cratering when dynamic surface tension rises during flash-off, especially over wood tannin bleed, resin exudation, or sanding dust. RH-T1006N is added at 0.10–0.50 wt% on total formulation after the isocyanate hardener has been pre-dispersed in water, and after an induction period of 10–15 min at 20–30 °C; addition before the hardener can produce viscosity drift in the pot mix. For waterborne systems, pre-dilution with a glycol ether co-solvent at 1:1 to 1:3 is used to prevent surfactant shock and local silicone-rich droplets that appear as fisheyes. Application equipment includes air-assisted airless pumps with 30:1 or 45:1 pressure ratios, fluid tip sizes of 0.011–0.015 in, and low-pressure spray guns at 0.6–0.9 bar atomizing air; flash-off tunnels maintain 35–45 °C for 5–10 min before forced drying at 40–60 °C for 60–120 min. The additive lowers wet-film surface tension to reduce crater depth and improve flow over open-pore and closed-pore wood, but excessive addition above 0.5 wt% delays sandability and risks intercoat adhesion failure after 24 h recoat windows. Compliance references EN 71-3:2019 + A1:2021 for migration of certain elements in children’s furniture and toy-contact surfaces, REACH Annex XVII restrictions, ISO 2409:2013 cross-cut adhesion, and DIN 68861-1:2011 furniture surface resistance criteria. Terminal finished product types include dining table tops, kitchen cabinet fronts, office desking components, and high-abrasion laminated furniture panels.
Oxygen inhibition in acrylate-functional UV clearcoats running on flexographic and roller-coating lines slows radical polymerization at the top 1–5 µm until surface cure is complete, allowing low-viscosity monomers and oligomers to dewet from substrate edges and around silicone contaminants. RH-T1006N is incorporated at 0.10–0.40 wt% on total formulation during the final dilution step, after photoinitiator dissolution and before viscosity is adjusted to 20–40 s DIN 4 mm at 23 °C. The coating process may use anilox rolls with 160–360 LPI screen counts and cell volumes from 3.0–12.0 cm³/m², enclosed doctor chambers, and mercury arc or 395 nm LED lamps delivering 800–1,200 mJ/cm² at line speeds of 10–80 m/min; when nitrogen blanketing is used, a nitrogen purity below 97% can reintroduce oxygen and surface inhibition. RH-T1006N reduces surface tension gradients on mixed substrates, including corona-treated PET at 40–50 mN/m and coated board, without suppressing the cure response of 2-hydroxy-2-methyl-1-phenyl-1-propanone and acylphosphine oxide photoinitiator packages. Compliance in this segment references EU Framework Regulation (EC) No 1935/2004 for food-contact materials, FDA 21 CFR 175.300 for resinous and polymeric coatings when used in food-contact applications, and EN 71-3:2019 + A1:2021 for toy safety. Finished product types include high-gloss folding carton overprint varnishes, PET film lamination adhesives, book cover coatings, and in-mold label overcoats. Published data for RH-T1006N migration after accelerated storage at 40 °C for 10 days is limited; specific migration testing on the finished printed article is required before food-contact use.
On coil coating lines processing 0.4–0.8 mm hot-dip galvanized or Galvalume steel at 60–180 m/min, a polyester-melamine topcoat is roll-applied at 18–25 µm dry film thickness and cured at a peak metal temperature of 216–232 °C for 25–40 s. RH-T1006N is introduced at 0.05–0.20 wt% on total formulation in the let-down vessel after the polyester resin and hexamethoxymethyl melamine crosslinker have been pre-blended, because predispersion under high-shear Cowles blades can generate microfoam that persists through the roll nip and causes pinholes. The roll coater typically uses a chrome-plated pickup roll and polyurethane or EPDM applicator rolls with a 0.5–2.0 s induction zone before the curing oven; peak metal temperature control is critical because silicone-enriched surfaces can reduce foam lamination and post-painting adhesion when PMT exceeds 232 °C. The additive permits flow-out of roll ridges before crosslinking, but dosage above 0.20 wt% can impair recoatability of the formed panel. Compliance standards include EN 13523-1 for film thickness, ISO 2813:2014 for specular gloss at 20° and 60°, EN 13523-2 for specular gloss of coil-coated metals, and RoHS Directive 2011/65/EU for restricted substances in building components. Terminal coated products include architectural facade panels, garage door sections, appliance wrappers, and HVAC housings.
Before the amine hardener is combined with a bisphenol A diglycidyl ether resin in a 100% solids epoxy floor coating, RH-T1006N is incorporated into the resin component at 0.10–0.40 wt% on total formulation using low-speed planetary mixing at 20–30 rpm under vacuum of -0.8 bar to -0.9 bar to prevent entrapped air. On industrial flooring projects, application proceeds by notched squeegee and 3/8–1/2 in nap rollers at film thicknesses of 300–500 µm per coat; ambient slab temperatures below 12 °C or relative humidity above 85% produce amine blush or carbamate formation that disrupts leveling and intercoat adhesion. The additive lowers surface tension to allow flow over power-troweled concrete with laitance and micro-roughness, but its effect is limited once the coating enters the 20–40 min pot life and viscosity rises beyond 1,500–2,500 mPa·s. RH-T1006N should not be predispersed into the neat amine hardener before resin mixing, as phase separation and localized gel particles can develop under stagnant storage. Compliance for these systems references ASTM D4060-19 Taber abrasion, ASTM D7234-19 pull-off adhesion on concrete, ASTM D4062-12(2019) leveling ratings, and ISO 15184:2020 pencil hardness after 7 days at 23 °C. Terminal finished products include warehouse floor slabs, parking garage ramps, pharmaceutical cleanroom floors where dusting is controlled, and food processing facilities requiring joint-free surfaces.
Solventborne nitrocellulose/polyurethane gravure overprint varnishes applied to metallized board and biaxially oriented polypropylene film at line speeds of 100–250 m/min exhibit solvent evaporation-driven cooling that increases viscosity at the web surface and creates orange peel and pinholes in solid areas. RH-T1006N is added at 0.10–0.35 wt% based on total ink/varnish formulation during final solvent adjustment after the nitrocellulose is fully dissolved, as undissolved resin particles can adsorb the silicone and deplete surface-active component. The production process uses engraved gravure cylinders with 50–90 L/cm screen rulings, electrostatic assist output of 0.5–2.0 kV, and drying hood air temperatures of 40–60 °C with residual solvent in printed film controlled below 10 mg/m² by gas chromatography. The additive reduces surface defects without altering the coefficient of friction beyond the range specified for high-speed sheeting and creasing, but addition above 0.35 wt% may reduce hot-foil stamping adhesion. Compliance references European Printing Ink Association guidelines for food packaging, REACH, and Swiss Ordinance SR 817.023.21 for printing inks intended for food contact where applicable. Terminal product types include labels for beverage bottles, overprint varnishes on cosmetic folding cartons, cigarette carton board, and metallized gift wraps.
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Product RH-T1006N is a silicone leveling agent supplied as a low-viscosity liquid for use in solventborne coatings and, after compatibility screening, selected water-reducible systems. The model designation identifies a polyether-modified polydimethylsiloxane copolymer; the polyether grafts introduce controlled polar compatibility, while the siloxane backbone retains the low surface tension required to reduce surface-tension-driven defects. Addition of the product at the letdown stage, after pigment dispersion, reduces Benard-cell formation, cratering, and orange peel. The relevant performance evaluation is not a single visual panel; ASTM D4062-16 drawdown leveling, ASTM D1331-20 surface and interfacial tension, and ASTM D523-14(2018) specular gloss measurements are used to separate flow effects from gloss retention. Fourier transform infrared spectroscopy can confirm the siloxane Si-O-Si absorbance band near 1090 cm⁻¹ and the polyether C-O-C band overlapping in the same region, although the exact chain length and ethylene oxide/propylene oxide ratio are batch-controlled rather than fully disclosed. The product’s behavior is therefore described by surface activity, migration kinetics, and compatibility rather than by total silicone content alone.
Batch-to-batch control parameters are listed in Table 1. The listed test methods are standard designations; numerical acceptance criteria are controlled by the supplier certificate of analysis and may vary by production campaign. Published data for this specific configuration is limited, so values in a technical data sheet should not be substituted for a batch certificate.
| Parameter | Test method | Unit | Batch certificate control |
|---|---|---|---|
| Appearance | Visual inspection | — | Clear to slightly opalescent liquid; no gel particles or foreign matter |
| Kinematic viscosity at 25 °C | ASTM D445-21 | mm²/s | Lot-specific range stated on certificate of analysis |
| Non-volatile content | ASTM D2369-20 | wt% | Lot-specific range stated on certificate of analysis |
| Density at 25 °C | ISO 2811-1:2016 | g/cm³ | Lot-specific range stated on certificate of analysis |
| Refractive index at 25 °C | ASTM D1218-21 | — | Lot-specific range stated on certificate of analysis |
Differences among additive classes appear primarily in surface tension reduction, foam stabilization, and intercoat adhesion. Unmodified dimethylpolysiloxane fluids reduce surface tension strongly but can stabilize microfoam and interfere with recoatability. Polyacrylate flow additives reduce surface tension moderately and often provide better recoatability, but they can increase surface tack and may require higher addition levels to control cratering. RH-T1006N, as a polyether-modified siloxane, occupies an intermediate position: the siloxane segment provides relatively rapid interfacial migration, while the polyether grafts reduce the persistent hydrophobic surface layer that causes intercoat adhesion loss. This distinction should be verified by measuring surface tension with ASTM D1331-20 and adhesion with ASTM D3359-17 after the intended recoat interval. Comparative screening on standard solventborne topcoats indicates that the additive class, rather than total silicone level, determines foam tendency; however, published data for RH-T1006N in all specific resin systems is limited.
Because polyether-modified siloxanes can undergo conformational changes with temperature and solvent polarity, the observed surface tension reduction is not a fixed value. In high-solids systems, the additive may migrate to the coating-air interface within seconds after drawdown; the resulting leveling effect is best quantified by wave-scan DOI and ASTM D4062-16 rather than by wet-film visual flow after application. In pigment-free clears, the same addition level can produce different gloss retention if the binder has low molecular weight or if strong tail solvents are present.
In solventborne high-solids polyurethane topcoats, the point of addition changes both viscosity and foam stability. If RH-T1006N is added before pigment dispersion on a Cowles disperser operating at tip speeds above 12 m/s, the high shear can generate fine bubbles that persist through filling. Addition during the letdown phase, after the millbase has been thinned and cooled below 40 °C, lowers the risk of air entrainment. On production-scale dissolvers, post-addition is commonly evaluated at 0.05 wt% to 0.3 wt% on total batch weight; the exact level is determined by a ladder study because solvent composition, pigment volume concentration, and resin molecular weight shift the additive demand. For quality control, a 1 kg retained sample should be checked by cone and plate viscosity at 10,000 s⁻¹ and by a single drawdown per ASTM D4062-16 to confirm inter-batch leveling.
If the production batch is filtered after filling, the filter type should be recorded because polyether-modified siloxanes can adsorb onto certain depth-filter media at low concentrations. In cartridge filtration with nominal retention ratings below 5 µm, the additive may be partially removed from the finished batch, shifting surface tension and wetting behavior. The filtration step should therefore be validated by comparing surface tension before and after filtration using ASTM D1331-20, not by observing only dry-film appearance.
In waterborne acrylic and polyurethane dispersions, the use of a silicone leveling agent requires separate compatibility screening because the polyether chain length controls solubility and foam characteristics. The product should be incorporated during the final letdown, under low-shear agitation below 500 rpm, and tested for package stability at 50 °C for 30 days according to ASTM D1849-95(2019). If a waterborne system develops coarse separation or oiling at the surface, the addition level should be reduced because the hydroalcoholic medium may not maintain the additive in the emulsion phase. Conditioning of panels before testing should follow ASTM D3924-16 at 23 °C and 50% relative humidity for 24 h.
Strongly acidic or alkaline waterborne systems can reduce long-term hydrolytic stability of siloxane-based additives. At pH above 9.5, storage stability testing should be extended beyond the standard 30-day check because siloxane rearrangement may occur slowly. In systems neutralized with volatile amines, the amine concentration should be confirmed by titration, and the final formulation should be reassessed for pH drift after accelerated storage.
When cross-coat adhesion is a process constraint, the formulator should compare RH-T1006N against a polyacrylate flow additive at the same surface-tension reduction range rather than at the same weight loading. The relevant test is ASTM D3359-17 cross-cut adhesion after a defined recoat window, with the topcoat sanded or unsanded according to the production specification. Silicone leveling agents can lower the critical surface tension of the cured film and create a weak boundary layer; polyether-modified products such as RH-T1006N are intended to reduce this effect but do not eliminate it entirely. If the process specification requires an adhesion rating of 5B after 24 h at 23 °C and 50% relative humidity, the additive level must be reduced until this criterion is met. Published data for RH-T1006N under all bake schedules and substrate pretreatments is limited, so panels should be prepared on the actual production substrate, including electrocoated steel and aluminum with the intended pretreatment.
Where maximum slip is not required, lower addition levels are preferable because the migration of silicone to the interface is dose-dependent and can saturate at higher levels. In a typical solventborne baking enamel, a level of 0.1 wt% may be sufficient to suppress Benard cells; doubling the addition to 0.2 wt% may improve slip but increase recoatability risk. The incremental benefit should be measured by ASTM D4062-16 and ASTM D3359-17, not assumed. If slip is required, the preferred measurement is a coefficient of friction test using the appropriate substrate pair, with the result reported together with the loading level and cure schedule.
Before replacing a current flow additive on an active production line, a retained-sample comparison under representative application conditions is required. The product should be stored in closed containers under dry, ventilated conditions; exposure to water can lead to turbidity or viscosity drift in silicone copolymers. In the laboratory, a sample taken from a partially used container should be re-homogenized with a low-shear mixer at speeds below 500 rpm and conditioned for 24 h at 23 °C and 50% relative humidity according to ASTM D3924-16 before rheology or application testing. The product is not a defoamer; in systems with high foam tendency, a separate defoamer addition is often required, and the two additives should be introduced at different stages to avoid phase incompatibility.
Regulatory compliance should be confirmed from the supplier safety data sheet and technical data sheet before formulation transfer. Relevant documentation includes REACH registration status, GHS classification, and any applicable food-contact status under FDA 21 CFR 175.300 or FDA 21 CFR 175.105 if the coating is intended for indirect food-contact use. RoHS compliance should be verified against Directive 2011/65/EU as amended, with specific attention to any restricted substance declared in the safety data sheet. These documents control the final material specification and should not be replaced by generic silicone additive regulatory statements.
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