| HS Code | 162367 |
| Product Name | ROVACE 661 |
| Product Type | Vinyl acetate-acrylic copolymer emulsion |
| Appearance | Milky white liquid |
| Ionic Character | Anionic |
As an accredited ROVACE 661 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ROVACE 661 is supplied in 55-gallon drums (500 lb net), 275-gallon totes (2,500 lb net), and bulk tankers. |
| Container Loading (20′ FCL) | ROVACE 661 is loaded into a 20′ FCL as palletized drums, securely braced, with proper lining for safe transport. |
| Shipping | ROVACE 661 is a water-based vinyl acetate copolymer emulsion. It is not classified as dangerous goods under IATA, IMDG, or ADR. Ship as a non-hazardous chemical in suitable drums, IBCs, or totes, protected from freezing. No UN number or hazmat markings are required; use standard labeling, documentation, and temperature-controlled transport. |
| Storage | Store ROVACE 661 in tightly closed original containers in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and incompatible materials. Maintain temperatures as recommended on the SDS, keep the area clean and free of leaks. Ensure containers are upright and properly labeled, and inspect periodically for damage or deterioration. |
| Shelf Life | Shelf life is 12 months from production date when stored sealed, dry, and at 15–25°C. |
Open time is controlled by the rate of water loss from the applied adhesive film, which depends on substrate porosity, air speed, film weight, and ambient relative humidity. For a two-ply veneer-to-particleboard assembly using ROVACE 661 at a spread rate of 100 g/m² to 140 g/m², the wet film remains tacky for 6 min to 12 min at 20 °C and 55% RH. When relative humidity falls below 35% or board surface temperature exceeds 28 °C, open time shortens to below 5 min and press loading must be accelerated. Addition of 4 wt% to 8 wt% of a fully hydrolyzed polyvinyl alcohol solution is the usual method to extend open time; levels above 10 wt% reduce water-resistance classification under EN 204 because the polyvinyl alcohol phase remains water-sensitive.
Cold-press conditions of 0.8 N/mm² to 1.2 N/mm² for 45 min to 90 min at 20 °C must produce sufficient viscosity build through water loss to prevent veneer springback while maintaining adequate wetting of high-density particleboard surfaces. Shear strength is measured by ASTM D905 after 7 d of conditioning at 23 °C and 50% RH. For interior furniture, a D2 classification under EN 204 is the practical performance ceiling; attempts to reach D3 or higher require an additional crosslinker, which introduces pot-life constraints and viscosity drift. The emulsion is incompatible with high-alkaline fillers such as sodium silicate and with direct addition of concentrated borax solution; gel particles form at local pH above 9.0 or borate concentration above 1.5% of the wet adhesive. Pre-drying of the board is unnecessary at ambient RH below 60%; above that value, board moisture content should be verified below 12% before spreading to avoid delayed adhesive set.
Wet-set pressure-sensitive flooring adhesives formulated with ROVACE 661 are used for luxury vinyl tile and plank installations over non-porous patching compounds, gypsum-based underlayments, and APA-rated plywood. The dispersion contributes tack development without external plasticizer; loop tack is evaluated by ASTM D6195 on polytetrafluoroethylene test surfaces after 24 h drying. Commercial formulations typically incorporate 10 phr to 25 phr of aqueous rosin ester or hydrocarbon tackifier dispersion to adjust initial grab. Calcium carbonate filler is added at 20 wt% to 40 wt% of total compound to control rheology and cost; increasing filler above 40 wt% raises viscosity nonlinearly and reduces film continuity under low-temperature installation. The adhesive is spread with a 2.4 mm V-notch trowel, giving a wet film thickness of 0.6 mm to 0.9 mm, and is allowed to flash for 10 min to 20 min before tile placement.
Open time and peel are measured according to ASTM D903 180° peel for floor-covering adhesives and EN 14259 shear adhesion after 24 h and 7 d. Substrate moisture must be below 75% relative humidity per ASTM D4263 or calcium chloride emission below 1.4 kg/100 m²/24 h per ASTM F1869 before installation; moisture-driven pH rise in concrete above 10 can increase tack and cause adhesive residue squeeze-out at tile seams. The polymer film is resistant to migration from vinyl tile, but the formulator must verify that tackifier and preservative selections do not themselves migrate into the wear layer and cause staining. If the formulation is used for carpet tile, peel strength is intentionally limited to permit dry removal; this requires reducing the tackifier level by at least 30% relative to LVT formulations and testing re-lay performance under ASTM D6004.
Stability limits should be mapped during scale-up. The wet adhesive should not be sheared above 2,000 rpm in high-speed dispersers because mechanical shear reduces viscosity and may generate foam that lowers film density. Freeze-thaw stability is limited; storage below 5 °C risks coagulation because the dispersion is not formulated as a freeze-thaw grade. At substrate temperatures below 10 °C, film coalescence is delayed and can produce tack failure at tile edges. In multi-story commercial buildings, installation areas should be conditioned at 18 °C to 25 °C for at least 48 h before adhesive use; otherwise open time and set speed vary beyond the ranges specified.
Expanded polystyrene foam board is wet-laminated to gypsum wallboard using a spray or curtain coater at 80 g/m² to 120 g/m². The waterborne film remains water-sensitive until dry, so the production line must include forced-air drying at 60 °C to 80 °C before stacking; stack pressures above 4 kPa before full drying can transfer adhesive to the back of the adjacent board. Solvent-based contact cement is replaced because its solvent fraction attacks the foam; the waterborne VAE film does not dissolve the substrate and reduces volatile organic compound emissions to below 50 g/L for the assembled article when no solvent is used in cleanup.
Bond performance is evaluated by ASTM D897 tensile adhesion on 100 mm × 100 mm test coupons after 7 d at 23 °C and 50% RH. The measured failure mode must be cohesive within the foam, not adhesive at the foam-gypsum interface. The formulation is typically thickened to 20,000 mPa·s to 40,000 mPa·s for curtain coater use; adding cellulosic thickeners above 0.5 wt% can retard water release and extend line drying time beyond 60 s at 80 °C. Avoid amine-based pH adjusters, which can react with residual ester stabilizers and produce ammoniacal odour during drying. When gypsum board is specified for fire-rated assemblies, the adhesive must not bridge the gypsum core and must be tested within the assembly under the relevant structural fire standard rather than as a free film.
Adhesive is applied through hot-melt replacement nozzles or knife-over-roll stations at machine speeds of 60 m/min to 120 m/min. The polymer dispersion is often blended with 20 phr to 40 phr of plasticizer or with a softer acrylic dispersion to obtain a flexible spine; plasticizer selection must be limited to non-phthalate types where the finished book is intended for children's products subject to CPSIA Section 108. Viscosity can be altered by high-shear pumping; after passing through a gear pump at 10 bar to 30 bar, viscosity may drop by 15% to 25% and recover over a period of several hours, so level control and recirculation flow must be stabilized.
Page pull and flex tests are performed according to ASTM D638 tensile on spine specimens and by cycling a finished book block at −20 °C to 60 °C. Application temperature below 15 °C increases viscosity and may produce stringing; above 35 °C the dispersion may skin in the nozzle. Cleanup with water is possible only before film formation; dried film requires mechanical removal or a solvent blend that does not attack polyurethane cover stock. In in-line library binding, the adhesive must wet printed endpapers without causing ink bleed; this is verified by a 24 h block test at 40 °C and 50% RH using the actual paper-ink system.
Flexible web lamination for dry food pouches, metallized barrier overwrap, and ream-wrapped board uses ROVACE 661 as a waterborne replacement for solvent-borne urethane adhesives. The dispersion is applied by engraved roller or air-knife coater at a wet film weight between 20 g/m² and 60 g/m²; after drying at web surface temperatures of 80 °C to 95 °C, the film is wet-bonded or heat-sealed to the second substrate. Bond performance is assessed according to ASTM D1876 T-peel after 24 h of conditioning at 23 °C and 50% RH. For bleached kraft, metallized polyester, and aluminium foil structures, the adhesive must leave no visible stain and must not block on rewind at stack temperatures up to 45 °C. The dried bond line is generally flexible enough to survive creasing and folding during pouch forming, but the extent of this performance must be confirmed by flex-crack testing under ASTM F392 using each converted film structure.
Food-contact status is established under 21 CFR 175.105 when a functional barrier separates the adhesive from food; where direct paper contact is intended, the formulation must meet 21 CFR 176.170 or 21 CFR 176.180 and every defoamer, biocide, and rheology modifier must be listed or cleared. Migration testing under EN 1186 is required for plastic-film laminates sold in the European Union; without lot-specific extraction data, no overall migration value is claimed. The primary process conflict is drying-rate control: web surface temperatures above 105 °C produce surface skin over a wet core, causing tunnel delamination after lamination, while temperatures below 70 °C retard coalescence and give low peel values on high-slip coated polyester. A third limitation arises when the adhesive contacts aluminium foil; the anionic stabilizer can react with aluminium ions from foil edges, so pH should be maintained at 4.5 to 5.5 and contact time minimized.
| Verification point | Method/Standard | Condition |
|---|---|---|
| T-peel strength | ASTM D1876 | 24 h at 23 °C, 50% RH |
| Blocking resistance | ASTM D907 modified stack test | 45 °C, 5 kPa, 24 h |
| Adhesive for food contact | 21 CFR 175.105 | Functional barrier or end-use extraction |
| Overall migration | EN 1186 | Plastic-film laminates, EU market |
Paper bag bottom paste lines operate with nozzle pressures below 1.5 bar and require viscosity at 800 mPa·s to 1,200 mPa·s to avoid overspray; ROVACE 661 is adjusted with 3 wt% to 5 wt% water or a polyvinyl alcohol solution before pumping through diaphragm valves.
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ROVACE 661 is supplied as a water-based, polyvinyl alcohol-stabilized vinyl acetate/acrylic copolymer dispersion intended for adhesive compounding and paper converting. The current published technical data sheet lists non-volatile content of 55 ± 1 wt% when determined by ISO 3251, pH of 4.5–5.5, Brookfield viscosity of 1,500–3,000 mPa·s at 25 °C under ASTM D2196-20, and a wet density of approximately 8.9 lb/gal (1.07 g/cm³) by ASTM D1475. Minimum film-forming temperature is reported at or below 5 °C per ISO 2115, which permits room-temperature coalescence without high loadings of volatile organic coalescing solvents. Mechanical film data obtained by ASTM D638-14 on free films are consistent with a soft, flexible acrylic-modified polyvinyl acetate matrix, although published data for this specific configuration are limited.
Bulk storage and process handling of ROVACE 661 are similar to other anionic/nonionic vinyl acetate emulsions. The product should be maintained between 5 °C and 35 °C; freeze-thaw cycling is destructive unless deliberate antifreeze additives are present. Low-shear propeller agitation before draw-off is standard. Ribbon or high-shear rotor-stator mixing can introduce sufficient mechanical energy to break the polyvinyl alcohol colloid layer and increase coagulum. Equipment fabricated from 316L stainless steel or high-density polyethylene is permissible, whereas unlined carbon steel and copper-containing alloys are excluded because soluble iron and copper ions accelerate destabilization and discoloration. Under these boundaries, a 6-month minimum shelf life in unopened containers is typical.
In high-speed case and carton sealing, adhesive delivery through wheel applicators, stencil applicators, or compressed-air spray nozzles determines the practical upper viscosity limit. For ROVACE 661 at 25 °C, undiluted spray application through a 0.5 mm air-atomizing nozzle at 1.5–2.5 bar atomizing pressure is typical; wheel application can accept the dispersion undiluted provided the transfer roll surface is hardened steel or ceramic. On clay-coated recycled board of 250–350 g/m², wet film coat weights in the range 40–80 g/m² are used. Compression belt pressures of 0.4–0.8 N/mm over 2–5 s produce fiber-tearing bonds that can be evaluated in shear by ASTM D3163-01 or in T-peel by ASTM D1876-08.
Substitution of solvent-borne polychloroprene or polyurethane adhesives in case sealing lowers total volatile organic compound emissions, but drying is controlled by water evaporation rather than solvent flash-off. The open-time window between adhesive application and compression must be revalidated after conversion. Thermographic drying at 50–70 °C surface temperature for 3–8 s is commonly used on high-speed lines. Plant trials with recycled board containing high levels of wax or silicone release agents should measure open time by incremental transfer delay because published data for this contamination-resistant configuration are limited.
Paper-to-paper and film-to-paper lamination with ROVACE 661 is performed on roller-nip laminators with gravure or reverse-roll coating heads. Coating viscosity at the point of transfer is frequently adjusted with deionized water to 1,000–1,500 mPa·s; excessive dilution below 35 wt% solids is not recommended because the polyvinyl alcohol colloid loses film integrity and penetration into porous substrates becomes uncontrolled. Applying 20–35 g/m² wet to 0.02–0.05 mm polyester film and nipping immediately to paper substrates yields bonds that frequently exhibit substrate fiber tear in ASTM D903-98 or ASTM D1876-08. For untreated polyolefin films, corona pre-treatment to 38–44 dyn/cm is necessary because the acrylic comonomer alone does not wet polypropylene surfaces.
The polyvinyl alcohol protective colloid is water-soluble, so dry adhesive films retain sensitivity to prolonged water contact. Water resistance is typically assessed by conditioning bond specimens under ASTM D1151-00 or EN 204 D2/D3 soak cycles. ROVACE 661 without crosslinker does not meet D4 boiling-water requirements; typical performance is confined to D2 or short D3 exposure. Addition of 5–10 wt% of an appropriate covalent crosslinker such as a polyfunctional isocyanate or glyoxal resin can extend water resistance, but pot life becomes limited and the adhesive must be processed as a two-component system. Formulators should confirm compatibility by ASTM D1876-08 after a 24-hour soak at 23 °C.
Amine-functional silanes and other pH-raising additives can destabilize the dispersion through charge neutralization when pH exceeds 7. In formulations targeted for low-water-sensitivity packaging, formulators often replace part of the polyvinyl alcohol-stabilized dispersion with a surfactant-stabilized acrylic or VAE grade. That substitution changes wet tack, rheology, and adhesion to recycled board, so the adhesive must be compared on the production line rather than by viscosity alone.
Tube and core winding utilize spiral-winding lines where adhesive is applied to paper webs at 30–120 m/min via doctor roll or slot nozzle. The wet tack requirement is met by the polyvinyl alcohol colloid; however, high-boiling plasticizers such as benzoate esters can reduce open time if added above 10 wt% on emulsion solids. Core winding trials often use 80–120 g/m² wet coat weight on 150–300 g/m² kraft. Specific published data for ROVACE 661 in this converting operation are limited, so pilot-line validation is required before setting final roll pressures and adhesive temperature.
Viscosity response of ROVACE 661 is non-linear because the polyvinyl alcohol stabilizer interacts with borax, boric acid, and some starch extenders. Incremental borax addition at 0.1 wt% intervals can produce a rapid rise in Brookfield viscosity above 10,000 mPa·s without coagulation. This response is useful for viscosity control in starch-blended packaging adhesives but may create dwell lines in high-speed transfer. pH adjustment is normally limited to 4.0–6.5; addition of ammonia or sodium bicarbonate above pH 7 can swell the colloid layer and cause heat-age viscosity drift. Dilution with deionized water should follow manufacturer guidance, with a typical maximum of 10 wt% for roll coating and 20 wt% for spray application. Viscosity is rechecked under ASTM D2196-20 Method A at 25 °C using spindle 3 at 20 rpm.
Production lines with brass valves or bronze homogenizer parts can show metal-ion streaking visible as light brown discoloration. Replacement with 316L stainless steel has eliminated the defect in multiple converting lines. Pneumatic diaphragm pumps with low shear rates are preferred over gear pumps when transfer distances exceed 10 m, because repeated high-shear cycles can shift the colloid layer and increase filter plugging on 250 µm mesh screens.
Compared with polyvinyl acetate homopolymer dispersions of equal solids, ROVACE 661 contains an acrylate comonomer that lowers minimum film-forming temperature and increases adhesion to coated and printed substrates. A homopolymer PVAc with 55 wt% solids often requires 10–15 wt% external plasticizer to reach a comparable MFFT below 5 °C; ROVACE 661 achieves low-temperature film formation with lower coalescing-solvent demand. Against vinyl acetate-ethylene dispersions, ROVACE 661 generally exhibits higher surface tack and less low-temperature flexibility, but less resistance to alkaline hydrolysis and lower elongation at break. These differences are measurable by ASTM D638-14 tensile elongation and ASTM D1876-08 T-peel on treated polyester film. Direct substitution into existing formulations should preserve wet film weight, then adjust open time and compression parameters.
| Parameter | Test method | Typical range |
|---|---|---|
| Non-volatile content | ISO 3251 | 55 ± 1 wt% |
| pH | ASTM E70/ISO 976 | 4.5–5.5 |
| Brookfield viscosity at 25 °C | ASTM D2196-20 | 1,500–3,000 mPa·s |
| Density | ASTM D1475/ISO 2811 | 8.9 lb/gal (1.07 g/cm³) |
| Minimum film-forming temperature | ISO 2115 | ≤ 5 °C |
Regulatory positioning of ROVACE 661 for food-contact adhesives should be verified through the manufacturer’s current compliance statement. Indirect-contact adhesives generally rely on FDA 21 CFR 175.105 and, for EU applications, Commission Regulation (EU) No 10/2011 with migration limits. REACH registration under EC 1907/2006 is required for EU import or formulation. The product is not formulated for direct food contact, and residual monomer content, where relevant, should be confirmed under current good manufacturing practice for sensitive packaging.
The operational boundary where ROVACE 661 becomes unsuitable is prolonged exposure above 85% relative humidity without crosslinking. Under those conditions, bond strength loss occurs via plasticization of the polyvinyl alcohol colloid layer rather than hydrolysis of the acrylate ester.
