| HS Code | 564735 |
| Productname | Silicone Leveling Agent RH-T1008 |
| Chemicalcomposition | Polyether-modified polysiloxane |
| Appearance | Colorless to light yellow transparent liquid |
| Form | Liquid |
| Activecontent | 100% |
| Viscosity | 500-1500 mPa·s at 25°C |
| Density | 1.02-1.06 g/cm³ at 25°C |
| Refractiveindex | 1.40-1.45 at 25°C |
| Flashpoint | >100°C |
| Solubility | Insoluble in water; soluble or dispersible in common organic solvents |
| Ionicity | Nonionic |
| Phvalue | 6-8 |
| Volatilecontent | ≤1% |
| Shelflife | 12 months in unopened container |
| Storagetemperature | 5-40°C |
| Recommendeddosage | 0.1-1.0% of total formulation |
| Compatibility | Compatible with solvent-borne and waterborne coating systems |
As an accredited Silicone Leveling Agent RH-T1008 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Silicone Leveling Agent RH-T1008 is packaged in 25 kg plastic drums with inner liners for safe storage and transport. |
| Container Loading (20′ FCL) | Silicone Leveling Agent RH-T1008 in a 20′ FCL, export-packed, palletized, securely stowed and lashed for ocean shipment. |
| Shipping | Silicone Leveling Agent RH-T1008 is typically shipped in sealed plastic drums or IBC totes as general chemical cargo unless its SDS states otherwise. Keep containers upright, dry, and away from extreme heat or freezing. Include the SDS and follow local transport and handling regulations. |
| Storage | Store Silicone Leveling Agent RH-T1008 in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep containers tightly closed, upright, and properly labeled. Protect from freezing and contamination. Avoid contact with strong oxidizing agents. Store only in original or compatible containers, and follow the manufacturer’s SDS and local regulations. |
| Shelf Life | RH-T1008 shelf life is about 12 months in original sealed containers, stored cool, dry, ventilated, away from direct sunlight. |
In solventborne automotive OEM clearcoats deposited over wet-on-wet waterborne basecoats, the primary defect burden shifts from bulk film appearance to surface tension-driven craters, pinholes and long-wave orange peel during the 5–10 min flash-off window. RH-T1008 is post-added to the clearcoat at a concentration range of 0.1–0.5 wt% on total formulation weight; below 0.1 wt% the additive is consumed at the substrate-coat interface and fails to suppress crater initiation from silicone-free overspray contamination. Above 0.5 wt%, migration kinetics during the 140 °C bake cycle produce a monomolecular silicone-rich surface that reduces intercoat adhesion when tested by ASTM D3359-17 method B, with adhesion ratings dropping from class 5B to 3B in laboratory panels after humidity exposure at 40 °C and 95% RH for 240 h. The addition sequence is critical: RH-T1008 must be introduced after pigment dispersion and after the melamine crosslinker is fully dissolved, using a low-shear propeller at 300–500 rpm, because high shear in a cowles disperser above 1500 rpm can incorporate air and destabilize the non-polar silicone domain. Leveling is measured by ASTM D4062-11 on panels applied with a robotic bell applicator at a bell speed of 45 000–55 000 rpm, a target dry film thickness of 40–50 µm, and a flash-off time of 8 min before bake; long-wave orange peel is tracked as a process control metric using a wave-scan instrument. Under these conditions, the additive functions by reducing the surface tension gradient between the wet film and airborne contaminants; a dynamic surface tension reduction to approximately 24–26 mN/m, measured with a maximum bubble pressure tensiometer at 0.1 s bubble lifetime, is regarded as the functional window for crater resistance in melamine-crosslinked acrylic clearcoats. Recoat adhesion must be confirmed on the production line by laminating a second coat over the baked film without sanding, because the silicone layer left by excessive dosage will fail electrostatic blow-off and cause fisheye in subsequent repair coats.
The transition from conventional flexographic overprint varnish to high-speed piezo inkjet overprint production introduces a film build constraint of 25–35 µm and a cure time below 0.5 s, during which the wet film must level before the UV lamp freezes the surface. In this configuration, RH-T1008 is incorporated at 0.05–0.2 wt% into the monomer/oligomer phase before the addition of photoinitiator; dosages exceeding 0.2 wt% reduce the surface tension below the wetting threshold of the nozzle plate and lead to satellite droplet formation and fouling at the printhead. The additive must be pre-diluted in dipropylene glycol diacrylate at a 1:10 ratio before in-line mixing, since direct dosing into the acrylate monomer at 25 °C causes localized gelling at the feed line. Crater suppression is evaluated by manual drawdown with a 76 µm wire-wound rod and by measuring the number of visible craters per 100 cm² after 24 h at 23 °C and 50% RH. A functional formulation shows no crater defects under ISO 2813:2014 specular gloss at 60° when measured on black charts. Published dynamic surface tension data at inkjet droplet ejection frequencies for this exact silicone polyether architecture are limited; optimization therefore relies on a drawdown series with 0.05 wt% increments rather than a single-point dosing. Equipment bottlenecks include the recirculating printhead system, where the low-viscosity varnish at 10–15 mPa·s and 40 °C must remain free of microfoam; a 10 µm inline filter downstream of the addition vessel is required to remove undispersed silicone domains.
Because waterborne wood primers and topcoats are formulated below 150 g/L VOC and dried at ambient temperatures of 15–25 °C, the absence of organic co-solvents cuts open time and promotes brush drag, surface skinning, and microretraction from tannin-rich zones. RH-T1008 is added at 0.1–0.4 wt% on total formulation, but direct incorporation into the letdown water causes an oil-in-water emulsion inversion and visible oily particles; the additive must first be diluted in propylene glycol n-butyl ether at a 1:5 ratio and then added under a low-shear axial stirrer at 200–400 rpm. Film formation is evaluated by applying a 150 µm wet film using a bar coater onto sealed beech veneer conditioned to 12% moisture content. Leveling performance is assessed by ASTM D4062-11; the scrape pattern from the drawdown bar should disappear within 3–5 min at 23 °C and 35% RH. In addition, foam decay after 60 min is monitored in a 250 mL graduated cylinder, because silicone-containing waterborne systems can retain macrofoam when the leveling agent is overdosed above 0.4 wt%. For toy and children's furniture applications within the EU, migration of specific elements is tested under EN 71-3:2019+A1:2021, and the cured film is subjected to the ISO 1519:2011 cylindrical bend test to confirm flexibility after 7 days of ambient cure. The production bottleneck occurs in low-gloss topcoats containing high levels of silica matting agents; the leveling agent competes with the silica surface for the air interface, and at dosages above 0.4 wt% it causes visible haze and a loss of gloss stability measured by ISO 2813:2014 at 85°.
At 23 °C and 50% RH, high-solids epoxy floor systems with a low-viscosity amine curing agent present a narrow leveling window because the mixed viscosity rises from 800–1200 mPa·s to 5000–7000 mPa·s within 15 min, and the pot life is typically less than 30 min. In this matrix, RH-T1008 is incorporated into Part A epoxy resin at 0.1–0.3 wt% before pigment dispersion and before addition of reactive diluents; it must not be added to Part B amine curer because the silicone polyether domain separates in the basic environment and increases the risk of amine blush. The mixed system is applied at a dry film thickness of 150–300 µm using a gauge rake or notched squeegee, and flow is observed for 10–15 min at 23 °C. Leveling is determined by ASTM D4062-11 on a glass panel; a formulation containing 0.2 wt% RH-T1008 shows complete disappearance of trowel marks before gelation, whereas the unfilled control retains visible rake ridges. Surface roughness is measured with a glossmeter at 60° and by tactile assessment of the cured film. Because epoxy-amine curing is moisture-sensitive, the relative humidity must be controlled below 85% RH; above this level, the silicone additive can stabilize water microdroplets at the surface and promote carbamate blush or whitening after 24 h of cure. For industrial floor installations requiring chemical resistance, post-cure testing follows ASTM D1308-20 with 10% citric acid and 50% ethanol for 24 h spot exposure, and ASTM D4541-17 pull-off adhesion is performed on concrete with a minimum 2.5 MPa cohesive failure. The main processing bottleneck is the transient foam layer during mixing; a slow-speed planetary mixer below 100 rpm and a vacuum degassing step at 50–100 mbar for 3–5 min are required before application.
If a polyester-melamine coil coating topcoat is roll-coated onto a metal strip moving at 100–200 m/min, the wet film is immediately exposed to a peak metal temperature of 220–240 °C; RH-T1008 at 0.05–0.2 wt% on total formulation reduces surface tension gradients during solvent flash and prevents the formation of craters and pinholing in the 15–20 µm dry film. However, when the coated strip exits the oven and is quenched below the dew point, condensation forms on the hot silicone-enriched surface, and the subsequent water marks become locked into the crosslinked melamine matrix. This failure mode is minimized by adjusting the extraction damper and cooling tunnel humidity rather than increasing the leveling agent dosage, because silicone migration toward the coating-air interface is already complete before the quench. The additive is pre-blended into the polyester resin at 60–80 °C before pigment grinding, and the paste is subsequently let down with melamine resin and blocked acid catalyst. Flow leveling is checked on laboratory panels using ASTM D4062-11 and surface slip is measured with a horizontal plane coefficient of friction rig conforming to ISO 8295:1995; block resistance after stacking is evaluated by ASTM D4946-89 at 50 °C for 24 h. Overdosage above 0.2 wt% reduces the coefficient of static friction to a point where coil stacking compresses the coating and creates pressure marks. The process bottleneck is the high-speed reverse roller coater; pickup and transfer must be tuned to prevent microfoam generation, and the wet film must remain free of droplets from the leveling agent because undiluted silicone droplets produce streaks that are measurable with ISO 2813:2014 at 20°.
In alkyd-melamine baking enamels with a total VOC below 400 g/L, the addition of 0.15–0.35 wt% RH-T1008 during the final letdown stage modifies both surface leveling and post-bake recoat response. The additive is stirred into the enamel after the drier package is added but before viscosity adjustment with aromatic solvent; the axial stirrer speed is maintained at 150–250 rpm to prevent silicone agglomeration. When sprayed with a conventional air-atomizing gun at 3.0–3.5 bar atomizing air and 2.0–2.5 bar fluid pressure, the wet film of 35–45 µm exhibits less orange peel than the unmodified enamel because the silicone-enriched surface suppresses solvent evaporation-driven eddy currents. Leveling is measured by ASTM D4062-11 on cold-rolled steel panels with a polyester epoxy primer; gloss is recorded at 60° using ISO 2813:2014. Recoat adhesion is evaluated after 7 days of ambient post-cure or 24 h after bake by applying a second topcoat without sanding; adhesion is then tested by ASTM D3359-17 method B. A dosage above 0.35 wt% causes a continuous silicone layer at the interface and reduces recoat adhesion to below class 3B. The main failure mode in production is visible fisheye in the repair coat when the baked enamel is not solvent-wiped with a tack cloth; this is due to the low surface tension of the additive-enriched surface and not incomplete cure. The lower dosing bound of 0.15 wt% is set by the need to control pigment-binder dispersant interactions during tinting, since competitive adsorption with high-molecular-weight dispersants can deplete the leveling agent from the air interface. Block resistance after stacking is evaluated by ASTM D4946-89 at 50 °C for 24 h; at 0.35 wt% the coating retains sufficient surface roughness to avoid sheet-to-sheet sticking, while above 0.5 wt% the silicone layer increases slip and reduces stack stability.
Because solventborne gravure printing inks for polyolefin film are wet-transferred at 150–300 m/min, the wet film thickness of 8–12 µm leaves almost no flash-off interval before the next print station. RH-T1008 is introduced at 0.05–0.15 wt% on total ink weight during the final letdown, after the nitrocellulose and polyurethane resins are fully dissolved. The additive must be diluted in ethyl acetate at a 1:5 ratio before addition, because direct dosing into the ink trough at press side creates localized silicone-rich droplets that print as circular pinholes. Leveling is evaluated on corona-treated polypropylene film at 38–42 dyn/cm surface energy, using a laboratory flexo proofer and an 8 µm gravure wedge. Print smoothness is assessed by ISO 2813:2014 at 60° and by visual craters per 100 cm² under a 10× loupe. The production bottleneck is the evaporation gradient at the doctor blade; when the silicone leveling agent is overdosed above 0.15 wt%, the film surface becomes over-slippery and the next ink layer fails to trap, reducing overprint adhesion and reducing bond strength as measured by ASTM D903-98 on laminate strips. This specific matrix requires the lowest dosage among the outlined sectors because the printing speed and low wet film weight magnify migration of silicone to the ink-substrate interface before the film solidifies.
Competitive Silicone Leveling Agent RH-T1008 prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8618005193850 or mail to sales8@bouling-chem.com.
We will respond to you as soon as possible.
Tel: +8618005193850
Email: sales8@bouling-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Silicone Leveling Agent RH-T1008 is a polyether-modified polydimethylsiloxane additive supplied for control of surface tension gradients, craters, orange peel, and long-wave flow defects in solventborne, high-solids, and aqueous coating formulations. The product is assigned the model designation RH-T1008 and is typically handled as a low-to-medium-viscosity liquid requiring batch-specific certificate of analysis review before formulation. Published data for this specific RH-T1008 configuration is limited; therefore, the properties described here should be interpreted as class-typical values for silicone polyether leveling agents unless supplier documentation explicitly states otherwise. Dynamic viscosity is measured according to ISO 3219:1993 or by Brookfield rotational viscometer at 25 °C. Density is measured at 20 °C according to ISO 2811-1:2016. Refractive index is determined by ISO 280:1998. Non-volatile content is determined by ISO 3251:2019. Silicone polyether leveling agents of this molecular class frequently fall within 200 mPa·s to 1,500 mPa·s at 25 °C, with density between 1.02 g/cm³ and 1.05 g/cm³, but RH-T1008 lot-specific values should be taken only from the supplier certificate of analysis.
Surface tension differentials across an evaporating wet film produce Marangoni flow, which contributes to cratering and leveling failure in industrial coatings. RH-T1008 is designed to migrate to the air-liquid interface and reduce interfacial tension without the uncontrolled slip and recoatability penalties associated with high-molecular-weight dimethyl silicone oils. In laboratory evaluations, the material is post-added under low-shear mixing at 0.05 wt% to 0.80 wt% on total formulation weight, depending on coating type, binder solids, pigment load, and drying profile. Formula optimization is performed with a wire-wound drawdown bar, a Byk-Gardner wave-scan DOI instrument, and gloss measurements under ISO 2813:2014. Because the product is a flow additive and not a primary resin dispersion aid, addition timing during mill-base letdown influences the final crater-resistance profile.
The most significant difference between RH-T1008 and unmodified polydimethylsiloxane fluids is the polyether modification of the siloxane backbone. This modification introduces hydrophilic chain segments that limit uncontrolled silicone migration and reduce the formation of persistent foam. Unmodified dimethyl silicone oils lower surface tension strongly but frequently create intercoat adhesion failures when carried into topcoat systems. RH-T1008, as a silicone polyether, is intended to balance surface tension reduction with recoatability under controlled dosage. However, the operational boundary is not indefinite: above approximately 0.6 wt% in high-solids two-component polyurethane topcoats, recoatability risks increase and must be verified by cross-cut adhesion testing according to ISO 2409:2020 or ASTM D3359-17.
Compared with polyacrylate leveling agents, RH-T1008 produces a stronger reduction in equilibrium surface tension and better flow across low-surface-energy substrates. Polyacrylate additives are generally non-silicone and can maintain good intercoat adhesion, but they are less effective at eliminating cratering caused by oily contamination or high surface tension gradients. The trade-off is that RH-T1008 can reduce surface tension sufficiently to promote wetting of contaminated substrates, while also requiring tighter dosage control because excessive silicone polyether concentration may soften surface slip, alter tactile properties, and reduce ink adhesion in printing applications. Unlike fluorosurfactants, which can reduce surface tension below 20 mN/m and may raise regulatory concern, RH-T1008 belongs to a non-fluorinated additive class and is generally evaluated under current REACH and RoHS documentation requirements. The exact surface tension reduction of RH-T1008 is not published in independent literature; formulators should determine equilibrium surface tension by Wilhelmy plate method under ASTM D1331-14 at the intended use concentration.
Table 1 summarizes class-level differences that formulators use when selecting a leveling agent. RH-T1008-specific values must be confirmed by batch testing because the exact polyether chain length, siloxane chain length, and terminal group distribution are not disclosed in public literature.
Table 1. Generic comparative behavior of leveling additive classes; RH-T1008 lot-specific results may differ.
| Additive class | Surface tension reduction | Slip improvement | Recoatability risk | Foam stabilization | Typical dosage range | Primary test response |
|---|---|---|---|---|---|---|
| Silicone polyether class represented by RH-T1008 | Moderate to high | Moderate | Low to moderate below 0.3 wt%; increases above 0.6 wt% | Low to moderate | 0.05–0.80 wt% | ASTM D4062-12; ISO 2813:2014; Byk-Gardner wave-scan |
| Unmodified polydimethylsiloxane oil | Very high | High | High | High | 0.01–0.10 wt% | ASTM D4062-12; ASTM D523-14 |
| Polyacrylate leveling agent | Low to moderate | Low | Low | Low | 0.20–1.00 wt% | ASTM D4062-12; ISO 2813:2014 |
| Fluorosurfactant | Very high | Moderate | Moderate | Moderate to high | 0.05–0.30 wt% | ASTM D1331-14; ASTM D4062-12 |
Compatibility limitations in RH-T1008 arise from the amphiphilic nature of the silicone polyether chain. In high-polarity aqueous systems containing high levels of water-miscible cosolvents, the additive may phase-separate or lose interface activity if solubility parameters are exceeded. Pre-dilution in a compatible solvent is recommended before addition to aqueous dispersions. Aqueous acrylic and polyurethane dispersions should be formulated at pH above 7.5 because silicone polyether hydrolysis may accelerate under strongly acidic conditions. The additive should not be combined with high levels of amine-functional silanes or strong Lewis acid catalysts without stability testing; premature destabilization of the silicone polyether structure can produce gels or reduce leveling efficiency. In two-component polyurethane systems, the presence of water in the additive from improper storage may consume isocyanate and alter stoichiometry. Containers exposed to high relative humidity should remain sealed, and storage at 5 °C to 35 °C is typical for silicone polyether leveling agents. If the material becomes turbid after cold storage, viscosity recovery at 20 °C to 25 °C under slow rolling is generally possible, but batch-specific thermal stability should be confirmed by supplier data.
Foam generation is evaluated because leveling agents that orient at the air-liquid interface may stabilize bubbles in spray-applied coatings. RH-T1008 is described in supplier literature as a low-foam grade, but low-foam does not mean non-foaming under high-shear airless spray application. High-shear dispersion equipment with Cowles blades or rotor-stator mixers may incorporate air, and bubble persistence is measured by density loss after agitation under ASTM D1210-05 or by observed bubble surface after spray application. When foam control is required, the formulation should include a suitable defoamer such as a mineral oil or organically modified siloxane defoamer. The order of addition matters: defoamer is commonly added during mill-base dispersion, while RH-T1008 is added during letdown or final thinning to avoid defoamer adsorption on pigment surfaces.
In solventborne alkyd and urethane systems, high-shear incorporation is not required. The additive is introduced under low-speed mixing at 300–600 rpm in a pilot or production mixing vessel equipped with an axial flow turbine. Prolonged post-addition mixing above 1,200 rpm can generate foam and increase temperature, which may change the viscosity of high-solids formulations. Batch-to-batch variance in additive color is normally low; visual appearance should be checked against an agreed standard. If haze develops, the batch is not automatically unfit, but it should be filtered through a 10 μm to 25 μm filter before use in clearcoats.
For aqueous industrial baking enamels, RH-T1008 is evaluated in combination with wetting agents and coalescing solvents. The sequence of addition affects crater resistance because coalescing solvent may alter the solubility parameter of the continuous phase. A recommended approach is to add the leveling agent after the coalescent has been incorporated and before final thickening. When the binder is an acrylic dispersion with minimum film formation temperature above 10 °C, the coalescent level should be fixed before additive evaluation because changes in coalescent dosage will shift the effective additive concentration at the film surface.
In two-package polyurethane topcoats, the isocyanate crosslinker and the hydroxyl-functional binder react over a pot-life window that may range from 30 minutes to several hours depending on resin type, catalyst, and solids. RH-T1008 is typically inert to isocyanate but may contain trace moisture or hydroxyl groups from the polyether portion; therefore, the manufacturer recommends the additive be incorporated into the polyol component before mixing with hardener. Addition to the hardener component alone can cause localized moisture contamination and gel particles. In high-solids clearcoats with a pot life below 2 hours, this sequence becomes critical because fluid viscosity rises continuously after mixing. Spray application with an HVLP or air-assisted airless gun is performed at 20–40 μm dry-film thickness, and long-wave flow defects are assessed after forced drying at 60 °C for 30 minutes. At RH-T1008 levels above 0.5 wt%, surface slip may increase measurably, and intercoat adhesion before sanding is evaluated by cross-cut testing under ISO 2409:2020.
With alkyd systems, cobalt or manganese driers catalyze oxidative crosslinking. Silicone polyether additives may interact with driers and alter surface dry rate. In long-oil alkyd enamels, the additive can improve brush drag and flow, but the surface may remain tacky if overdosed. Exact compatibility with RH-T1008 in alkyd systems should be checked by measuring surface dry time under ISO 9117-1:2009 and through-dry under ISO 9117-2:2010. When both alkyd and two-package polyurethane formulations are manufactured on the same dispersion line, batch records should specify separate additive pre-mix tanks to avoid cross-contamination from residual alkyd drier metal ions, which can affect polyurethane cure.
The additive is also evaluated in solvent-free radiation-cure systems. In UV-curable urethane acrylate coatings, silicone polyether leveling agents modify surface tension during wet-film relaxation but may influence surface cure if they accumulate at the oxygen-inhibited interface. A nitrogen-inerted UV line operating at 150–300 mJ/cm² may show different surface cure than an air-exposed line. Among silicone polyether additives, polyether content and terminal group selection determine whether migration creates a persistent slip layer. RH-T1008 dosage in UV systems is generally lower than in high-solids thermoset systems; formulators begin at 0.05 wt% to 0.30 wt% and assess surface hardness, fingernail mar, and recoatability after UV cure.
For coil coating applications, the additive is introduced into solventborne polyester or PVDF topcoats. Leveling occurs rapidly because peak metal temperatures may exceed 200 °C within seconds. Dose-response data for RH-T1008 in PVDF coil coatings are not published; process evaluation under production oven conditions is required. The additive must not generate volatile byproducts that condense on oven ducts or cause plate-out in the cooling zone. Surface slip is measured by coefficient of friction, but not all silicone polyethers provide the high slip required by some coil applications. If high slip is required, RH-T1008 may be combined with a high-molecular-weight silicone slip additive, provided recoatability and formability are validated by ISO 1519:2011 or ISO 6860:2006.
Defect reduction in forced-air drying depends on the time available for leveling before viscosity rises beyond a critical point. In a 30 μm wet-film coating dried at 60 °C with air velocity of 0.5 m/s, the rate of solvent or water evaporation influences whether RH-T1008 can maintain low interfacial tension long enough to eliminate brush marks or spray texture. Long-wave leveling is assessed with a Byk-Gardner wave-scan or equivalent instrument; short-wave leveling is assessed by visual inspection under incident light. The additive does not correct gross film defects caused by poor substrate cleaning or insufficient atomization. Its function is to reduce surface tension gradients and allow flow at the surface layer, not to compensate for film thickness variation from spray gun movement or non-uniform application.
In waterborne direct-to-metal coatings, flash rusting and pinhole formation may occur at high humidity. RH-T1008 has no corrosion-inhibiting function. If applied at low dry-film thickness below 20 μm, pinholes can form from air or water vapor escaping through the surface layer. The additive may not prevent this defect and, in some formulations, may stabilize surface foam and worsen pinholes. Weld-seam penetration and edge coverage are governed by rheology rather than surface tension, so the additive should be evaluated with the complete rheology modifier package. For spray-applied waterborne one-coat enamels, a practical test protocol includes drawdown at 75 μm and 125 μm wet film, air-dry for 24 hours, and measurement of gloss at 20°, 60°, and 85° under ISO 2813:2014, followed by cross-cut adhesion under ISO 2409:2020.
In high-solids two-component epoxy coatings used on concrete or steel, RH-T1008 may improve surface appearance but must be evaluated for compatibility with amidoamine and polyamide hardeners. Amine-functional hardeners may interact with the polyether segment but more critically with any residual acidic groups from manufacturing. No published data for RH-T1008 in epoxy-amine systems is available. Batch trials should begin with a control formulation and a single additive ladder at 0.1 wt%, 0.3 wt%, and 0.5 wt%. Pot-life is measured by a viscosity rise under ISO 3219:1993 or by a simple bubble-rise flow cup method at 25 °C. If viscosity rise accelerates relative to the control, the additive may be reducing curative availability or promoting water uptake; the batch should be rejected for that formulation.
In wood furniture coatings, the product may be used in acid-curing or polyurethane topcoats. Leveling agents in this class influence rub resistance and blocking resistance after stack drying. A dosage that improves glass and flow may soften the surface or increase blocking if storage temperature exceeds 40 °C. Blocking resistance is tested after panels are stacked with 1 kg/cm² pressure at 25 °C and 50% RH, then separated and inspected for surface damage. This test is not standardized globally for all wood coatings, but internal methods often follow ASTM D2197-16 for adhesion or blocking resistance principles. The formulator should document the specific method and acceptance criteria.
Table 2 supplies a compliance and testing matrix relevant to incoming RH-T1008 lots and finished coating performance. The list is not exhaustive; regional regulatory and customer specifications may require additional data.
Table 2. Compliance and quality verification matrix for RH-T1008 supply documentation.
| Parameter | Test method or standard | Typical report frequency | Operational note |
|---|---|---|---|
| Appearance | Visual inspection | Each lot | Clear to slightly opalescent; absence of gel particles |
| Dynamic viscosity at 25 °C | ISO 3219:1993 | Each lot | Specify spindle and shear rate on CoA |
| Density at 20 °C | ISO 2811-1:2016 | Each lot | Use calibrated pycnometer |
| Non-volatile content | ISO 3251:2019 | Each lot | Report time and temperature; commonly 105 °C for 2 hours for class |
| Refractive index | ISO 280:1998 | Each lot | Used to detect contamination or segregation |
| Surface tension at 0.1 wt% in test solvent | ASTM D1331-14 | Supplier application report | Use Wilhelmy plate; temperature equilibration at 25 °C |
| Adhesion after additive use | ISO 2409:2020 or ASTM D3359-17 | Finished coating validation | Test on relevant substrate and topcoat stack |
| Regulatory compliance | REACH; RoHS 2011/65/EU Annex II | Supplier declaration | Confirm batch-specific material category and SVHC status |
In printing inks and overprint varnishes, RH-T1008 is evaluated at lower addition levels than in architectural coatings because surface slip can affect ink transfer, abrasion resistance, and subsequent foil adhesion. Solventborne gravure and flexographic inks operate at high speed, and the available time for leveling is very short. The additive can reduce cratering and pinholing in flexo inks on low-surface-energy films, but over-addition may cause plate wetting changes, print mottle, or loss of surface tension contrast needed for half-tone reproduction. A starting point of 0.02 wt% to 0.20 wt% on total ink weight is used in laboratory trials. Printability is evaluated on production-scale flexo presses with corona-treated polyethylene or polypropylene film, and surface properties are characterized by contact angle measurement and tape adhesion testing. In overprint varnishes, blocking resistance and coefficient of friction are more important than in many paint films. The silicone polyether structure of RH-T1008 may improve slip but can reduce the coefficient of friction below the range acceptable for some packaging lines; this effect is formulation-dependent and must be measured under controlled conditions.
In plastisol and leather finish systems, the additive modifies surface appearance and release characteristics. Plastisol formulations require care because silicone polyether additives may migrate to the surface of the fused film and alter print bonding or heat-sealing. Leather finish coats can benefit from improved leveling and reduced cratering over release papers, but the product may alter flex resistance and must be tested in combination with plasticizer and crosslinker. No public performance data for RH-T1008 in plastisol or leather finish systems is available, so process-specific validation is required before production use.
Dedicated to excellence in chemistry — serving industries worldwide with integrity and innovation.
