| HS Code | 350263 |
| Product Name | Vinavil 2433 |
| Chemical Family | Vinyl acetate-acrylic copolymer emulsion |
| Appearance | Milky white liquid |
| Solids Content | 55% ± 1% |
| Viscosity | 2500-4000 mPa·s (Brookfield, 20°C) |
| Ph | 4.5-5.5 |
| Density | 1.06-1.08 g/cm³ |
| Particle Size | 0.2-0.5 µm |
| Glass Transition Temperature | Approximately 5°C |
| Minimum Film Forming Temperature | Approximately 0°C |
| Film Appearance | Transparent, flexible |
| Storage Stability | Stable for 6 months at 5-35°C |
As an accredited Vinavil 2433 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Vinavil 2433 is supplied in 200 kg drums or 1000 kg IBC containers as a water-based vinyl acetate-ethylene copolymer emulsion. |
| Container Loading (20′ FCL) | Loading Vinavil 2433 into a 20′ FCL container: secure properly, label clearly, ventilate, and prevent leakage or damage during transit. |
| Shipping | Vinavil 2433 is a vinyl acetate-ethylene copolymer emulsion supplied in drums, IBCs, or bulk tankers. Shipments should be protected from freezing, excessive heat, and direct sunlight. Standard non-hazardous chemical transport is acceptable, but containers must remain sealed, upright, and clearly labeled during transit. |
| Storage | Store Vinavil 2433 in its original, tightly sealed container in a cool, dry, well-ventilated area, out of direct sunlight. Protect from frost and avoid temperatures below 5°C or above 35°C. Keep away from heat and ignition sources. Stir gently before use. Use within shelf life, typically 12 months from dispatch. |
| Shelf Life | Shelf life of Vinavil 2433 is approximately 12 months from manufacture when stored sealed, cool, and frost-free. |
Vinavil 2433 is processed as a waterborne vinyl acetate/ethylene/vinyl chloride terpolymer dispersion in saturation and coating lines where the chloride-containing comonomer delivers a measurable char-promoting effect under flame exposure. In nonwoven padding operations, the dispersion is diluted to a bath solids range of 8–20 wt% depending on web grammage and target dry add-on, then applied through a two-roll or three-roll pad mangle at nip pressures of 3–6 bar. Carded webs of 20–80 g/m² processed at line speeds of 20–80 m/min typically receive dry resin add-on of 12–25 wt%; the saturated web is dried in a through-air drum or stenter at 125–150 °C with residence times of 60–180 s. Optional crosslinking with a fully methylolated melamine-formaldehyde resin at 3–6 phr or a blocked isocyanate dispersion at 2–5 phr increases solvent resistance and fibre-locking under wet conditions, but the crosslinker must be added as the last component to avoid premature reaction in the acidic region below pH 4.5. Terminal nonwovens include technical filtration media, automotive headliner formats, furniture wrap, and disposable industrial wipes; the chlorine-bearing backbone reduces reliance on migratory halogenated flame-retardant additives that otherwise complicate documentation under OEKO-TEX Standard 100 Annex 4 or EN 13501-1 substrate classification.
Substitution of a conventional EVA dispersion with Vinavil 2433 in textile backcoating shifts the compound response in three measurable areas: initial tack temperature, char formation under radiant heat, and filler tolerance. In blade-over-roll coating, the compounded paste is typically adjusted to 5000–9000 mPa·s at 25 °C with a polyacrylate alkali-swellable thickener after the calcium carbonate filler has been dispersed at 100–250 phr. The chloride-containing polymer permits reduction of standard antimony trioxide/brominated additive loadings because halogen is already present in the polymer chain, although the full fire-class outcome remains substrate-dependent and must be verified by EN ISO 11925-2 or DIN 4102-1 B2 tests on the finished textile composite rather than on the latex film alone. Processing on a knife-over-roll unit with a blade gap of 0.5–1.2 mm, a gas-fired infrared pre-gel zone at 130–160 °C, and a stenter final cure at 130–145 °C gives consistent shrink stability for contract carpet and entrance mat backing. Filler dispersion should be carried out with a sodium polyphosphate or low molecular weight polyacrylate dispersant at 0.1–0.4 phr; high-speed Cowles mixing beyond 1500 rpm on small batches can generate local shear zones above the latex coagulation threshold and should be avoided unless a jacketed vessel maintains temperature below 35 °C. If the paste is left overnight, pH must be checked and adjusted to 7.5–8.5 with dilute ammonia before re-running to prevent viscosity drift from filler/latex interaction.
Vinavil 2433 functions in heat-reactivated adhesive films and wet laminating systems where flexible or semi-rigid PVC must be bonded to wood composites, ABS edgebanding, or pre-primed metal. The wet adhesive is roller-coated at 50–80 g/m² wet onto the PVC profile or edgebanding backside, force-dried at 60–80 °C to a tack-free but heat-sensitive film, and then reactivated with hot air or a heated pressure roller at 70–90 °C at line pressures of 0.3–0.8 N/mm². The low plasticizer requirement is relevant because external plasticizer migration from flexible PVC into the adhesive layer is a known cause of bond-line softening; the terpolymer’s upper phase compatibility with chlorinated surfaces resists interfacial delamination under the 40 °C and 65% RH conditions applied in EN 204/205 durability testing for non-structural woodworking bonds. For furniture edgebanding, the adhesive must be qualified against the D2 or D3 classes of EN 204/205, recognizing that the chloride-containing backbone may require an isocyanate hardener at 2–4 wt% on total dispersion to meet water resistance requirements. Published data for this specific configuration in load-bearing timber structures is limited. Edgebanding lines using high-frequency activation are not recommended unless the adhesive has been pre-qualified for electrical field sensitivity, because the chloride content can increase polar charge retention and cause irregular reactivation at heating rates above 15 °C/s.
| Application line | Processing parameter | Typical setpoint | Qualifying method |
|---|---|---|---|
| Nonwoven pad-mangle saturation | Nip pressure | 3–6 bar | EN ISO 9073-3 tensile after conditioning |
| Textile backcoating | Paste viscosity at 25 °C | 5000–9000 mPa·s | EN ISO 11925-2 |
| Edgebanding reactivation | Heat roller temperature | 70–90 °C | EN 204/205 durability class |
| Acoustic felt spray bonding | Dry add-on | 15–30 wt% | FMVSS 302 / ISO 3795 |
| Blackout foam coating | Wet foam density | 180–300 g/L | EN 1021-1 |
Decorative wallcovering top-coat and foam base-coat formulations containing Vinavil 2433 are compounded without coalescing solvents in most production plants because the dispersion forms a continuous film under heated drying conditions; plant verification of minimum film formation temperature on the specific substrate is required before reducing dryer temperatures. Foam-coated wallcoverings are produced by mechanically foaming the dispersion with a fatty alcohol ethoxylate or ammonium stearate stabiliser to a wet density of 200–400 g/L, knife-coating onto a pre-primed paper or glass fleece at 100–300 g/m² wet, and drying in tunnel ovens with zoned air temperatures from 100 °C to 140 °C. The chloride-containing chain contributes to the surface hardness and dry-scrub resistance required by EN 259-1 for heavy-duty wallcoverings, while the terpolymer remains sufficiently flexible to prevent cracking when the finished wallcovering is folded at 20 °C. Terminal products include vinyl wallcoverings, glass textile wallcoverings, and paintable lining systems for renovation substrates.
In automotive acoustic felt lines, recycled cotton/synthetic shoddy webs of 600–1200 g/m² are sprayed or saturation-coated with Vinavil 2433 diluted to 15–30 wt% solids, then compression-dried in forced-air ovens at 130–150 °C with a final dry add-on of 15–30 wt%. The chloride-containing binder reduces formulation dependence on decabromodiphenyl ether and antimony trioxide, which is operationally significant for interior components required to meet FMVSS 302 horizontal burn rates below 100 mm/min or ISO 3795 equivalents. Airflow resistance is maintained by directing spray nozzles to the web surface rather than through-saturation; typical pressure settings of 1.5–2.5 bar with air-atomising nozzles produce a shell-bonded structure that preserves open porosity. Because the dispersion is anionically stabilised, recycling of water from felt washing or spray booth scrubbers must be controlled for divalent cation buildup above 200 ppm Ca²⁺, otherwise progressive flocculation occurs at the nozzle tip and generates web defects. Component-level acoustic absorption is measured by ISO 10534-2 at specified thicknesses, and the binder contributes primarily to rigidity and flame resistance rather than to acoustic damping, which remains dominated by fibre architecture.
For blackout curtain and roller blind coating, the dispersion is converted to a mechanically foamed compound with a target wet foam density of 180–300 g/L, applied by knife-over-roller or rotary screen at coating weights of 60–150 g/m² dry, and subsequently collapsed and sintered between 110 °C and 135 °C. The anionic/nonionic surfactant package in Vinavil 2433 must be balanced against the foam stabiliser; an excess of low HLB nonionic emulsifier can produce over-stabilised foam that remains open and permeable after oven exit, while insufficient stabiliser leads to partial coalescence in the coating trough and streaking. The addition of a high-molecular-weight polyurethane associative thickener at 0.2–0.8 phr is used to control drainage without creating excessive high-shear viscosity. Chloride-containing foam backings provide measurable improvement in smoulder resistance according to BS 5852 Source 0 or EN 1021-1 when compared with vinyl acetate homopolymer backings, though the final cigarette-smoulder classification depends on the full seating or furnishing composite rather than on the coating alone.
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Vinavil 2433 is a plasticizer-free aqueous polyvinyl acetate homopolymer dispersion supplied by Vinavil S.p.A. for absorbent-substrate bonding in wood assembly, paper and board lamination, and packaging operations. The dispersion is supplied as a high-viscosity emulsion, and its dry film is rigid and hard after water removal. Because the product contains no ethylene comonomer, it occupies a different processing envelope than vinyl acetate-ethylene dispersions; because it contains no external ester plasticizer, it avoids the plasticizer-migration failure mode encountered with softer PVAc grades. The physical profile is therefore defined by a comparatively high minimum film-forming threshold, strong polar interaction with cellulose and mineral surfaces, and a shear-thinning viscosity that permits roller and pump application when the working temperature is maintained above the coalescence threshold.
The homopolymer composition raises the film-formation temperature above that of vinyl acetate-ethylene copolymers. Ethylene units lower rotational barriers along the polymer chain and reduce glass transition temperature; their absence increases film hardness and creep resistance at ambient temperature, but narrows low-temperature application latitude. A roller-coated layer at 18–20 °C coalesces into a continuous film only if the substrate and surrounding air remain above the minimum film-forming threshold specified for the product. If cold board stock or evaporative cooling drops the wet film below that threshold, the dried layer can appear white, powdery, and discontinuous. The setting mechanism remains primarily physical water loss into the substrate and atmosphere, followed by particle coalescence. Solids content of 52 ± 2 % measured by ISO 3251:2019 reduces the water volume that must be removed and contributes to rapid initial grab on softwood and paper. The dried film is harder than a VAE dispersion of equivalent solids, but flexibility is lower; this trade-off is beneficial for rigid wood lamination and undesirable where film elongation is required.
Compared with vinyl acetate-ethylene copolymers, Vinavil 2433 exhibits higher wet tack on absorbent surfaces but lower elongation and lower cold-temperature coalescence. Compared with plasticized PVAc homopolymers, it eliminates external plasticizer migration, but the dried film is harder and may require higher press pressure to achieve adequate contact on warped veneer. In paper-to-paper laminating lines operating below 16 °C, a VAE dispersion with minimum film-forming temperature near 0 °C can form a film without infrared preheating, whereas Vinavil 2433 may require heated rolls or infrared assist. The product therefore should not be selected as a drop-in replacement for VAE in cold-room packaging or for plasticizer-softened PVAc in self-adhesive label applications without re-validating line speed and coat weight.
Manufacturer technical documentation lists representative values. Brookfield viscosity is measured by ISO 2555:2018 using the spindle and speed indicated on the batch certificate. The values below are not upper/lower guarantees; production lots may vary within the tolerance. Viscosity drift after frost exposure or prolonged storage above 30 °C can exceed the listed range even when pH and solids remain within specification.
| Parameter | Measurement standard | Representative value |
|---|---|---|
| Solids content | ISO 3251:2019 | 52 ± 2 % |
| Brookfield viscosity at 20 °C | ISO 2555:2018 | 15 000–25 000 mPa·s |
| pH | ISO 976:2013 | 4.0–6.0 |
| Density at 20 °C | ISO 2811-1:2016 | 1.08–1.10 g/cm³ |
| Minimum film-forming temperature | ASTM D2354 | approx. 16 °C |
On a roll-fed laminating line with a nip pressure of 0.3–0.6 MPa and line speed of 18–25 m/min, the viscosity requires a doctor-roll gap matched to adhesive solids. Insufficient gap can starve the web; excess gap can create overflow and edge contamination. The shear-thinning character reduces apparent viscosity under pump and roll shear, but continuous circulation through gear pumps above 30 °C may accelerate skin formation and increase coarse particles. Clean-up with water is possible before the wet film dries; after coalescence, removal requires organic solvent or mechanical cleaning.
Typical usage levels in wood assembly range from 120 to 200 g/m² wet coat depending on substrate absorbency and moisture content. On a twin-roll spreader, the working gap between metering rolls is set to deliver a uniform coat; because of high viscosity, gap settings below 0.10 mm can create shear heating and streak marks on low-absorbency hardwood. For edge-glued panels, adhesive is applied to one face and the assembly is pressed within the open time window. Cold-press pressure is selected to close the joint without excessive squeeze-out; a wet film of 300 µm typically deposits 25–30 g/m² dry adhesive weight. High-frequency presses can reduce pressing time, but the dielectric properties of PVAc must be accounted for; rapid heating can skin the edges before the center reaches set temperature.
The upper viscosity boundary is important for transfer pumps. At 25 000 mPa·s, the product can be transferred with a progressive cavity pump, but diaphragm pumps with long suction lines may experience cavitation if line pressure drops below the vapor pressure of the water phase. The Reynolds number in a 25 mm transfer line is low; flow is laminar, and pressure drop scales linearly with viscosity. In a central adhesive kitchen, line length should be minimized or heat-traced if ambient temperature is below 16 °C. Filtration through a 100 µm mesh is recommended; finer filters may increase pressure and reduce throughput. The product is not classified as flammable; however, cleaning water that contains dried adhesive particles can accumulate in drains and should be collected before discharge.
Polyvinyl acetate homopolymer dispersions are normally classified as D1 or D2 under EN 204:2016 unless a hardener modifies crosslink density. Vinavil 2433 is therefore positioned for interior wood assembly where prolonged water contact is not expected. For D3 water resistance, an acidic hardener or reactive crosslinker is required, but pot life and viscosity shift must be evaluated. In a beech cold-press assembly line, dry lap shear is often substrate-failure dominated, whereas after the 4 h cold-water soak in the D3 sequence the same joint can fail adhesively if no hardener is present. This is the expected boundary of a thermoplastic PVAc homopolymer, not a product defect. Users requiring D3 or D4 performance should not substitute Vinavil 2433 without a validated hardener system and should confirm the mixed adhesive against the EN 204:2016 D3 sequence. Hardener addition may reduce pot life to 4–8 h at 20 °C and can increase viscosity nonlinearly; optimum hardener level for a given press cycle is normally determined by a response-surface study varying hardener concentration from 1 to 3 wt% and press time from 20 to 60 min.
Open time is controlled by liquid-water removal from the wet adhesive surface. Under production-room conditions of 20 °C and 60 % RH, open time on birch veneer is typically 8–12 min, but the range narrows below 50 % RH and expands above 70 % RH. If the film skins before contact, dry spots form and bond strength drops. Cold-press pressure for softwood edge-glued panels normally falls between 0.7 and 1.0 MPa; dense hardwood substrates require the upper portion of the range and longer press residence times. High-frequency heating can shorten clamp time, but high viscosity makes spread control sensitive to board moisture content. Boards below 6 % moisture content pull water from the adhesive too rapidly, reducing open time; boards above 12 % moisture content can dilute the adhesive and slow setting.
A failure mode observed with high-viscosity PVAc dispersions is viscosity stratification within IBC containers. If Vinavil 2433 is not recirculated or gently stirred before use, the first 100 L pumped from an IBC may have lower viscosity than the bottom fraction; this produces variable adhesive coat weight on the line and can shift adhesive transfer on roller coaters. Homogenization by low-shear agitation or drum tumbling for 20–30 min is recommended before bulk transfer. Foam generated during mixing must be allowed to dissipate or be removed by vacuum deaeration, because foam in roller coaters causes pinholes in the adhesive film. On paper labels and glass, polar functionality of the PVAc provides adhesion without primer; on polyethylene and polypropylene, corona pretreatment or a primer is required because the dispersion alone does not wet untreated polyolefins.
Freeze-thaw stability for PVAc homopolymers is generally poor. Storage below 5 °C can cause irreversible thickening and sedimentation; storage above 30 °C shortens shelf life and increases the risk of skin formation. The product should not be combined with strong alkaline materials because high pH can destabilize the dispersion. Addition of aromatic solvents or coalescing agents is not required above the minimum film-forming temperature, but closed mixing vessels should be ventilated because residual vinyl acetate monomer and acetic acid can be released. A 100 µm mesh filtration before roller coaters is common practice to remove coarse particles formed by skinning or frost damage.
Vinavil 2433 is manufactured under the REACH registration obligations of Regulation (EC) No 1907/2006. For food-contact packaging, many PVAc homopolymer dispersions meet the compositional requirements of FDA 21 CFR 175.105 for adhesives used in packaging, but the manufacturer’s written confirmation should be obtained for the specific lot before use. Transport classification is generally non-dangerous for land transport; handling in bulk still requires local exhaust ventilation and skin protection because residual vinyl acetate monomer and acetic acid can be irritating.
| Requirement | Reference | Status / boundary |
|---|---|---|
| EU chemical safety registration | REACH Regulation (EC) No 1907/2006 | Registered dispersion; SDS required |
| Wood adhesive classification | EN 204:2016 | D1/D2 without hardener; D3 only after validated hardener addition |
| Viscosity measurement | ISO 2555:2018 | 15 000–25 000 mPa·s |
| Solids measurement | ISO 3251:2019 | 52 ± 2 % |
| Food-contact packaging adhesive | FDA 21 CFR 175.105 | Requires manufacturer lot confirmation |
| Storage temperature boundary | Manufacturer batch documentation | 5–30 °C; freeze-thaw instability below lower threshold |
