| HS Code | 444002 |
| Product Name | Vinavil PW195 |
| Chemical Family | Polyvinyl acetate (PVAc) homopolymer |
| Physical Form | Aqueous dispersion (white liquid) |
| Solid Content | 55% by weight |
| Viscosity | 8000-12000 mPa·s (Brookfield RVT, 25°C) |
| Ph | 4.0-5.0 |
| Density | 1.08-1.10 g/cm³ |
| Particle Size | 1-2 micrometers |
| Glass Transition Temperature | 29°C |
| Minimum Film Forming Temperature | 5°C |
| Adhesive Type | Water-based adhesive for wood, paper, and packaging applications |
As an accredited Vinavil PW195 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Vinavil PW195 is supplied in 25 kg multi-layer paper bags with protective inner liner, palletized and stretch-wrapped. |
| Container Loading (20′ FCL) | Vinavil PW195 is shipped as a 20′ FCL, with palletized drums securely loaded and braced for safe transport. |
| Shipping | Vinavil PW195 ships as a non-hazardous chemical in sealed multi-layer bags or drums. It must be protected from moisture, humidity, and physical damage. Use covered, dry transport; avoid extreme heat or freezing. Keep packaging intact during handling. Include product identification, batch number, and SDS in shipping documents. |
| Storage | Store Vinavil PW195 in original, tightly sealed containers in a cool, dry, well-ventilated area. Protect from direct sunlight, frost, and temperatures above 30°C. Keep away from oxidizers and strong acids. Stir before use. Under recommended conditions, shelf life is typically 12 months from production date. |
| Shelf Life | Shelf life: 12 months from production date when stored in original sealed containers at 5–35°C, protected from frost. |
In flat lamination of plasticised PVC membrane to medium-density fibreboard and honeycomb door cores, Vinavil PW195 is applied through a two-roll gravure coater with chrome-plated rolls engraved at 60–80 lines per linear inch. The dispersion is transferred at 90–110 g/m² wet onto the PVC reverse face before infrared flash-off and thermal reactivation at 55–70°C. Plant practice requires recording Brookfield viscosity according to ISO 2555:2018 with spindle 6 at 20 min⁻¹ and 25°C before each shift; excursions above the target band alter ribbed-roll transfer and produce adhesive strike-through at the laminate edge. Nip pressure at the laminating station is maintained between 0.4 MPa and 0.7 MPa depending on board density, because higher pressure compresses fibreboard and reduces final panel thickness below the tolerance permitted by the customer drawing. Green tack after 60 s must support a 300 g peel load before stacking. Stacking of laminated panels before 24 h is limited to 1200 mm height to prevent cold flow and blocking under warehouse conditions of 20–25°C and 50–60% RH. Plasticiser migration from the PVC film into the dried polymer matrix is monitored after accelerated ageing for 7 days at 50°C; loss of peeling force beyond 15% on ASTM D903-98 specimens indicates inadequate crosslinking or insufficient dry film thickness. The same dispersion is not recommended for direct contact with solventborne polyurethane topcoats unless the laminated panel is flash-cured at 80°C for 10 min to remove residual moisture. Recycled adhesive recovered from the coater trough must be screened through a 150 µm mesh before reconditioning, and the feed line should be jacketed at 18–22°C to prevent skinning at the doctor blade.
Formulating Vinavil PW195 for water-resistant wood joints requires the controlled addition of an aliphatic polyisocyanate crosslinker at 2.5–5.0 parts per 100 parts dispersion. The two-component blend is mixed under low shear at 300–500 min⁻¹ for 5 min and then degassed under vacuum for 3 min. Pot life at 25°C is typically 45–90 min; beyond that interval, rheological yield stress increases and the adhesive cannot penetrate beech test specimens with uniform fibre coverage. Joints are prepared according to EN 205:2016 using panels conditioned at 23°C and 50% RH. Cold pressing at 0.8 N/mm² for 60 min is sufficient for initial handling, but water resistance requires 7 days of ambient crosslinking before immersion testing. Failure mode in the EN 204:2016 D3 sequence shifts from cohesive wood fibre tear in dry specimens to interfacial adhesive failure after 4 days in cold water when the crosslinker dose falls below 2.0 parts. When 5.0 parts is exceeded, film hardness increases but viscosity rises sharply during the first 30 min, causing roller coater clogging and rejected panels. Mixed adhesive that cannot be processed within the pot life must not be thinned with water, because rheology collapse and phase separation occur below pH 3.0. Scraper blades must be cleaned with warm water before the crosslinked film reaches full cure; post-cure residues require methyl ethyl ketone and damage rubber applicator rolls. The specific formulation limit for Vinavil PW195 with aromatic polyisocyanate systems is limited in publicly available technical literature; plant qualification trials should therefore bracket 2.0, 3.5, and 5.0 parts to fix the heat-and-water resistance boundary for each hardwood species.
In side-seam and carton-sealing operations on clay-coated paperboard, Vinavil PW195 is pumped through a heated header at 30°C to a wheel applicator. The applied adhesive film is controlled at 0.10–0.15 mm wet thickness, because lower thickness produces insufficient fibre tearing, while higher thickness causes sling and machine fouling at line speeds above 80 m/min. Set time is evaluated by a spring-loaded compression rig under a 0.2 MPa load for 10 s; fibre tear must exceed 90% on recycled board with 16% moisture content. Migration control for food packaging is governed by FDA 21 CFR 175.105 and, where applicable, EU Regulation 10/2011 as amended. Formulators prepare migration test coupons using 25 g/m² adhesive dry film, a polyethylene-coated aluminium foil barrier, and Tenax simulant at 40°C for 10 days. The dried dispersion must not raise overall migration above 10 mg/dm² for the intended surface-to-volume ratio. Residual formaldehyde and vinyl acetate monomer are monitored by headspace gas chromatography with flame ionisation detection according to ISO 6401 for polymer dispersions; acceptance levels are fixed by the converting plant, not by the resin supplier. Because high-humidity storage of finished cartons can introduce moisture through the board, blocking resistance is checked with a heated-block test at 40°C and 70% RH for 24 h under a 5 kg weight. Vinavil PW195 in this application is typically compounded with 3–5 wt% tributyl citrate plasticiser to retain cold flexibility during frozen-food packaging; the blend is stirred at 500 min⁻¹ for 10 min and left to deaerate for 2 h before use. Foaming induced by long transfer lines is suppressed with 0.1–0.2% polysiloxane defoamer, but excess defoamer causes cratering on the wheel applicator film and reduced transfer to the carton flaps.
| Application condition | Test standard | Measured parameter | Control point |
|---|---|---|---|
| Food-contact migration | FDA 21 CFR 175.105 | Overall migration | 10 mg/dm² |
| EU food-contact migration | EU Regulation 10/2011 | Overall migration | 10 mg/dm² |
| Brookfield viscosity | ISO 2555:2018 | Spindle 6, 20 min⁻¹, 25°C | Shift target band |
| Dry wood tensile shear | EN 205:2016 | Tensile shear strength | Cohesive fibre failure |
| Water resistance D3 | EN 204:2016 | Wet tensile shear | No interfacial failure |
For disposable hygiene coverstock and automotive interior scrim bonding, Vinavil PW195 is applied at 6–10 g/m² dry via rotary screen or spray application onto a polypropylene nonwoven. The operating window depends on rheology under high shear. A cone-and-plate measurement at 10,000 s⁻¹ according to ISO 3219 identifies whether the dispersion will sheet unevenly under the spray nozzle; values below 150 mPa·s cause overspray, while values above 400 mPa·s leave untransferred droplets. Drying is configured with a three-zone forced-air oven: 80°C in the first zone, 100°C in the second, and 120°C in the third, with residence times of 12 s, 10 s, and 8 s. Coalescence of the deposited film is incomplete when the web exit temperature remains below 60°C; white cracking along creped regions is then observed after 3-point flexural cycling. Adhesion to untreated polypropylene is limited by low surface energy; corona pre-treatment at 38–42 dyn/cm is necessary to achieve a 180° peel strength above 1.5 N/25 mm on ASTM D903-98 specimens after 24 h conditioning. Bonded laminate blocking is assessed in a forced-air oven at 50°C under a 2 kg block for 16 h; blocking failure appears as fibre transfer from the nonwoven to the polyethylene backsheet. Because the dispersion is shear-sensitive, transfer pumps should be progressive cavity rather than gear pumps. If system pressure exceeds 4 bar, mechanical shear can reduce the apparent viscosity permanently and alter the spray pattern. Wiping of the spray nozzles with alkaline cleaning agents must be avoided; even 1% sodium hydroxide raises pH at the nozzle seat and initiates grit formation that blocks the air cap. Atomising air pressure is fixed at 1.5–2.0 bar with a nozzle distance of 300 mm; the air-to-fluid mass ratio is held at 1.2:1. Published data for spray-grade Vinavil PW195 in high-speed nonwoven lines are sparse; production qualification should begin with a 10-minute on-line run at 50 m/min, followed by 100 m at 150 m/min to detect aerosol generation and edge build-up.
| Coating line | Line speed | Wet add-on | Drying profile | Failure mode monitored |
|---|---|---|---|---|
| PVC membrane lamination | 8–15 m/min | 90–110 g/m² | 55–70°C reactivation | Edge strike-through |
| Nonwoven spray | 50–150 m/min | 6–10 g/m² dry | 80/100/120°C | Overspray and aerosol |
| Foam electrostatic spray | 4–8 m/min | 12–18 g/m² dry | 90°C for 3 min | Electrode short-circuit |
Vinavil PW195 can serve as the polymer binder in trowellable wood fillers and gap-filling sander-joint compounds. In this formulation route, the dispersion is charged first into a planetary mixer equipped with wall scrapers, then calcium carbonate with a median particle size of 2–5 µm is added incrementally at 150 min⁻¹. The filler-to-dispersion mass ratio is raised stepwise to 1.8:1, while the scraper-to-wall clearance is maintained at 1.5 mm to prevent dead zones. Because carbonate fillers increase pH above 7.0, the dispersion may undergo viscosity drift and microcoagulation if the fill rate exceeds 5 kg/min per 100 kg batch. The pH during the first 20 min after filler addition should not exceed 6.0; beyond that, the dispersion loses its pseudoplastic character and the filler settles during 48 h shelf storage. Rheology is characterised with a Brookfield viscometer using spindle 7 at 4 min⁻¹ and 20°C; target values are 80,000–120,000 mPa·s for smooth trowel application. The cured compound is evaluated for dry film adhesion to beech and oak using a cross-cut test according to ISO 2409:2020. Shrinkage is measured after 28 days at 23°C and 50% RH; values above 12% volumetric shrinkage indicate insufficient filler packing and can promote crack opening in 8 mm deep sander joints. Moisture resistance is determined by 24 h immersion at 23°C; softening of the filled film should be less than 25% of the initial Shore D hardness according to ISO 868:2003. Incompatible additives include zinc oxide and amine-based dispersants, which can cause premature flocculation and a sudden increase in mixing torque. If a defoamer is needed, a mineral-oil-free polysiloxane defoamer at 0.05% is preferred; excess defoamer migrates to the surface and harms overpaintability under solventborne polyurethane topcoats. Filler moisture above 0.5% alters the pseudoplastic response and extends drying time at 23°C beyond 4 h; when required, calcium carbonate is pre-dried at 120°C for 16 h before charging.
Foamed polyethylene and cross-linked polyolefin sheet used in automotive gaskets and thermal insulation can be coated with a thin anti-block layer based on Vinavil PW195. The formulation contains 5 wt% fumed silica with a BET surface area of 200 m²/g, dispersed at 2500 min⁻¹ for 20 min using a high-shear dissolver. The thixotropic index, measured as the ratio of viscosity at 1 s⁻¹ to 10 s⁻¹, is adjusted to 2.0–3.5 with hydrophobically modified acrylic thickener. Electrostatic spray application requires the formulation conductivity to be between 80 µS/cm and 150 µS/cm; below 80 µS/cm the charged droplets lose their field-guided deposition, and above 150 µS/cm the spray gun can short-circuit at the electrode. The wet film is applied at 12–18 g/m² dry and dried in a convection tunnel at 90°C for 3 min. Surface resistivity of the coated foam is tested according to IEC 61340-2-3; values above 1010 Ω are not suitable where static decay is specified. The anti-block property is quantified by stacking coated and uncoated foam sheets under 1 kPa at 40°C for 72 h and measuring the peel force; acceptable force is below 0.5 N/25 mm on ASTM D903-98. Because the substrate is non-polar, corona pre-treatment at a minimum surface energy of 36 dyn/cm is required before coating. If treatment decays below 34 dyn/cm before application, edge retraction and fish eyes appear within 10 s of wetting. The dispersion must not be stored below 5°C, because one freeze-thaw cycle can produce coarse particles that plug the 100-mesh filter after only 5 min of spraying. If the coated sheet is later thermoformed above 150°C, the anti-block coating must remain non-tacky at forming temperature; a heated probe test at 150°C with 0.1 N contact pressure for 30 s is used to rule out transfer to the mould surface.
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Vinavil PW195 is an aqueous polyvinyl acetate homopolymer dispersion stabilized with polyvinyl alcohol. The product is supplied as a white viscous liquid with a non-volatile content of 52 ± 1 % when tested to ISO 3251:2019, a Brookfield RVT viscosity of 25,000–35,000 mPa·s at 25 °C using spindle 5 at 20 min−1 (ISO 2555), a pH of 4.5–5.5 by ISO 976, and a density of 1.08 g/cm³ at 20 °C by ISO 2811. The dispersion is intended for wood-bonding compounds, paper and board lamination, and general assembly adhesives where a hard, transparent, non-blocking dry film is required and where external plasticizers are deliberately excluded.
Because Vinavil PW195 is a plasticizer-free homopolymer, its minimum film formation temperature is approximately 17 °C. This value represents a practical lower limit for unheated lamination and assembly. At substrate temperatures below 17 °C, the polymer particles fail to coalesce completely and the dried film appears turbid and develops low cohesive strength. On flat-bed laminators running above 40 m/min, the web surface is normally raised to 21–23 °C with IR preheaters before the adhesive transfer station. In carton side-seam wheels, the adhesive may be applied at ambient temperature, but the compression section must be kept above the minimum film formation temperature with jacket heating.
Vinavil PW195 is a homopolymer, whereas vinyl acetate-ethylene grades contain ethylene comonomer that lowers the glass transition temperature of the dried polymer. For unplasticized polyvinyl acetate, differential scanning calorimetry typically records a glass transition between 28 °C and 33 °C; vinyl acetate-ethylene copolymers can show glass transition temperatures below 0 °C depending on ethylene content. The practical consequence is that PW195 produces a harder, higher-tensile-strength bond line with lower creep under sustained load, but it has less low-temperature flexibility and lower elongation. In D3 wood adhesive compounding, this hardness contributes to dry shear strength development on beech at 12 ± 1 % wood moisture content, but it does not alone confer water resistance. D3 classification under EN 204 requires tensile shear testing after dry storage and cold-water immersion in accordance with EN 205; a crosslinking additive is usually necessary. Published data for this specific configuration is limited; qualification should therefore include the complete EN 204 sequence on the production adhesive, not on the neat dispersion.
Compounding is carried out in low-shear stainless-steel vessels. A 1000 kg batch is charged with the dispersion, and demineralized water is added slowly to adjust flow; an anchor agitator at 20–30 min−1 is sufficient for dispersion without shear-induced coagulation. High-shear sawtooth impellers above 1500 min−1 are not recommended because they can rupture the polyvinyl alcohol protective colloid and increase foam. If calcium carbonate filler is used, it should be predispersed in water or added after dilution, otherwise the high low-shear viscosity of PW195 can trap filler aggregates. When a polyvinyl alcohol solution is used as a thickener, it is added at 10–15 % solids and the mixture is stirred under vacuum for 30 min to remove entrained air. The final adhesive typically shows a Brookfield viscosity of 40,000–70,000 mPa·s depending on filler and thickener load; roller and nozzle equipment must be sized accordingly.
Rheologically, Vinavil PW195 behaves as a shear-thinning colloid. In a controlled-stress rotational rheometer fitted with a 40 mm cone-and-plate geometry, the low-shear viscosity at 0.1 s−1 can exceed 100 Pa·s, while the viscosity at 100 s−1 falls below 10 Pa·s. This means that transfer from drums through narrow piping requires progressive cavity pumps because centrifugal equipment cannot generate suction against the yield stress. In clean-in-place operations, dried polymer must be softened with warm dilute alkali or organic ester solvents before flushing; the use of steam alone causes crosslinking of the polyvinyl alcohol protective colloid and increases cleaning time.
Before use, incoming lots should be checked against the certificate of analysis. Viscosity drift outside the ± 15 % target window is frequently caused by premature freeze exposure, evaporation during open storage, or post-addition of hard water. pH values below 4.0 may indicate microbial fermentation and should trigger further testing. The following typical values are reproduced from the supplier’s technical literature and are not batch specification limits.
| Property | Typical value | Reference method |
|---|---|---|
| Non-volatile content | 52 ± 1 % | ISO 3251:2019 |
| Brookfield RVT viscosity | 25,000–35,000 mPa·s at 25 °C | ISO 2555 |
| pH | 4.5–5.5 | ISO 976 |
| Density at 20 °C | 1.08 g/cm³ | ISO 2811 |
| Minimum film-forming temperature | 17 °C | ISO 2115 |
| Residual vinyl acetate monomer | <0.1 % | manufacturer’s gas chromatographic method |
Viscosity is strongly shear-thinning. A value recorded at 100 min−1 can be less than half the value recorded at 20 min−1; therefore the spindle number, rotational speed, and temperature must be reproduced exactly. The pH electrode should be standardized with pH 4.01 and 7.00 buffers because the dispersion is acidic.
Storage should be maintained at 5–30 °C. One freeze-thaw cycle can irreversibly coagulate the dispersion; the residue on a 180 µm screen can rise from below 0.05 % to above 1 % and the coagulated material is not re-dispersible. Drums and totes should remain sealed because the polyvinyl alcohol protective colloid can form surface skins that must not be stirred back into the batch. For transfer, progressive cavity pumps are preferred; centrifugal pumps operating at 2900 min−1 can generate foam and reduce pump efficiency. If dilution water is required, it should have a conductivity below 500 µS/cm to minimize interaction with the protective colloid.
Plasticizer-free Vinavil PW195 removes external plasticizer migration from the bond line. In dry lamination of paper-to-paperboard for food-contact packaging, the absence of dibutyl phthalate, diisobutyl phthalate, or benzoate plasticizers simplifies the demonstration that the adhesive does not exceed the overall migration limit of 10 mg/dm² under EU 10/2011 and national food-contact frameworks. The harder dry film also reduces blocking under stacked sheet pressure at warehouse temperatures up to 40 °C. The trade-off is lower wet tack on heavily coated boards; to maintain fiber tear above 90 % at the nip, operators may need to reduce open time by moving the nip closer to the application point or increase the applied wet film weight. On high-speed carton lines above 250 m/min, this change can require rebalancing wheel speed and doctor blade pressure.
Compared with a plasticizer-modified homopolymer, PW195 has a higher minimum film formation temperature, so cold-weather start-ups on unheated lines are more sensitive. If the board temperature is below 17 °C, the lamination may show incomplete film coalescence and reduced water resistance. A heated nip or IR preheater is therefore required when ambient temperatures drop below 15 °C. The product is also less blocking-prone after drying because the absence of liquid plasticizer prevents softened films under stack pressure.
Relative to starch/dextrin adhesives, the synthetic dispersion has higher bond strength and water resistance after drying, but it is less repulpable and can form screen residues in low-consistency paper recycling. This operational boundary should be assessed before substituting PW195 in paper sack bottom pasting for mills that sell recovered furnish to tissue producers.
Vinavil PW195 is not intended for structural joints or continuous water immersion without chemical modification. Wet strength retention after 24 h water soak is typically below 50 % of dry strength in unmodified films, and D4 durability is not claimed for the neat dispersion. The dispersion is incompatible with strong acids, large additions of polyvalent metal salts, and solvents that dissolve polyvinyl acetate. Ammonia and volatile amines can raise the pH above 6.5 and thicken the dispersion through polyvinyl alcohol gelation; they should be prediluted and added slowly if pH adjustment is unavoidable. The product must not be frozen, and containers should be protected from direct sunlight to prevent surface skinning.
