| HS Code | 525821 |
| Product Name | CW-805 PVAc Emulsion |
| Appearance | White milky liquid |
| Solid Content | 50 ± 2% |
| Viscosity | 8000 - 12000 mPa·s at 25°C |
| Ph | 4.5 - 5.5 |
| Density | 1.05 - 1.10 g/cm³ at 25°C |
| Particle Size | 0.5 - 2.0 μm |
| Glass Transition Temperature | Approximately 30°C |
| Minimum Film Formation Temperature | Approximately 10°C |
| Film Clarity | Transparent after drying |
| Water Resistance | Good for standard PVAc emulsion |
| Storage Stability | 6 months at 5°C to 35°C |
As an accredited CW-805 PVAc Emulsion factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | CW-805 PVAc Emulsion is packaged in 50 kg HDPE drums, securely sealed, labeled, and supplied with safety documentation. |
| Container Loading (20′ FCL) | CW-805 PVAc Emulsion loaded in 20′ FCL with suitable drums/IBCs, secured and ventilated to prevent leakage and maintain stability. |
| Shipping | CW-805 PVAc Emulsion ships in sealed drums or totes, protected from freezing and extreme heat. Keep containers upright and well-ventilated during transport. Avoid spills and static ignition sources. Standard non-hazardous chemical handling applies; use appropriate PPE and secure loads properly to prevent leakage. |
| Storage | Store CW-805 PVAc Emulsion in a cool, dry, well-ventilated area, ideally between 5–35°C. Keep containers tightly sealed when not in use to prevent skinning and contamination. Protect from freezing, direct sunlight, and extreme heat. Use within recommended shelf life, typically 6–12 months, and stir gently before use if separation occurs. |
| Shelf Life | Shelf life is 12 months from production date when stored in original sealed containers at 5–40°C, protected from freezing and direct sunlight. |
In flat-laminated beech and spruce frame stock, CW-805 PVAc emulsion is applied as a single-face dispersion at 140–180 g/m² for softwood and 120–150 g/m² for high-pressure laminate. Wood equilibrium moisture content is held between 6% and 10%; moisture above 10% extends squeeze-out penetration into open grain and produces steam weakening during high-frequency cure. Press pressure for solid beech is 0.7–1.2 N/mm², for spruce 0.5–0.8 N/mm², with press time 20–40 min at 20–25°C. When high-frequency presses operating at 13.56 MHz are used, edge temperature reaches 70–90°C within 3–5 minutes, but the dispersion film must remain below 95°C to avoid coalescent skinning. Open assembly time on unheated shop floors at 20°C/65% RH is 8–12 minutes; closed assembly time beyond 15 minutes produces dry spots under finger-joint pressure. After 24 h at 20°C, tensile shear strength on beech tested to EN 205 typically exceeds 10 N/mm² dry; after 4 days immersion in water at 20°C, values above 2 N/mm² meet EN 204 D3. For D3 durability, addition of 2–4 phr ammonium zirconium carbonate is preferred over glyoxal because the latter accelerates pH drop below 3.0 and destabilizes the dispersion. Amine-based defoamers or amine pH modifiers are excluded from this formulation because pH above 5.5 reduces wet tack and early shear. Batch-to-batch viscosity variation of ±10% on a Brookfield RVT spindle 4 at 20 rpm requires pump stroke correction on roller coaters, otherwise coat weight drifts by ±8 g/m². Application below 5°C is not acceptable; the minimum film formation temperature of 5–7°C means coalescence in unheated edge lamination is incomplete and green strength remains below clamp release threshold. Terminal products include solid wood door frames, window scantlings, laminated tabletop cores, and finger-jointed softwood blanks.
Field monitoring of refrigerated folding carton lines running CW-805 at 50% solids has shown that substitution of hot-melt side seam adhesive is limited not by open time but by compression dwell. A direct application at 3,500–4,500 mPa·s through a 0.8 mm slot nozzle onto clay-coated SBS board gives fiber tear after 0.3–1.5 s of compression at 0.2–0.4 MPa only when the dispersion is pre-diluted to 800–1,500 mPa·s. Dilution with 5–10% deionized water lowers first-fiber-tear time but extends block resistance. For cold storage at -20°C, 5–8 phr triacetin or acetyl tributyl citrate is incorporated into the let-down; phthalate plasticizers are excluded from food-contact formulations under FDA 21 CFR 175.105. The terminal bonds are used on frozen vegetable cartons and ice cream multipacks, where condensation at 4°C after freezer exit must not produce edge pop. A side seam compression belt below 0.15 MPa fails to crush board caliper reduction beyond 3%, leaving a visible seam ridge. When calcium carbonate in the recycled back liner raises surface pH above 8.5, emulsion pH below 4.5 causes viscosity drift within 2 h in the recirculation trough; buffering with sodium acetate to pH 4.8–5.0 improves machine stability. Published data for CW-805 under direct food-contact transfer after freezer cycling is limited; therefore barrier board with a functional polyethylene layer is required when condensate contacts the adhesive film. Cleaning of nozzle lips uses hot water at 45–50°C; dried CW-805 residues require 10–15% ethanol in water rather than ketone solvents, which swell nitrile seals. Terminal products include frozen food side seam cartons, multipack sleeves, and refrigerated dairy overpacks.
Sideloading CW-805 at 3,800–4,500 mPa·s through a progressive cavity pump into a two-roll nip exposes a cavitation boundary at the pump inlet. When inlet pressure falls below 0.08 MPa absolute, dissolved air nucleates into voids; volumetric output drops by 12–18% and coat weight becomes oscillatory at 0.5–1.0 Hz. A 1.5 inch stator with 300 rpm rotor requires a positive head of 0.05–0.10 MPa and a hopper temperature of 20–25°C. The dispersion is diluted 5–10% with deionized water to 1,800–2,500 mPa·s before roll transfer. Between 40 m/min and 80 m/min line speed, wet film deposit on clay-coated SBS is 40–80 µm; nip pressure at 2–4 N/mm² collapses the film and penetrates board pores. For book cover and rigid game board lamination, open time of 3–5 minutes allows laydown before the skin forms, but crosslinking additives are not used because paper-converting slitting requires clean dusting at trim knives. Terminal bond tests to ISO 1924-2 generally show fiber tear above 80% of bonded area after 24 h. Where recycled board contains carbonate, prolonged contact beyond 4 h in the return tray raises pH to 7.8–8.4 and increases viscosity by 15–25%; this is corrected by reducing recirculation volume to a 20-minute residence time. Cleaning of rollers with warm water at 40°C before the film passes the tack point prevents surface picking. Terminal products include hardcover book cases, rigid box lids, game boards, and display trays.
Ready-mix joint compound plants that replace vinyl acetate-ethylene binders with CW-805 encounter a pH shift before filler addition. The emulsion at pH 3.5–4.0 is pre-neutralized with ammonia to pH 7.0–7.5. Calcium carbonate 325 mesh is added at 300–450 phr relative to emulsion solids in a Cowles disperser at 1,200 rpm for 15 minutes under vacuum deaeration at -0.08 MPa. Water addition of 50–100 phr and attapulgite clay of 2–5 phr bring final Brookfield viscosity at 0.5 rpm to 150,000–250,000 cps. The critical threshold is filler loading above 5:1 by mass to dry binder: shrinkage drops below 1.5%, but sandability increases dust generation and edge cracking appears at 2 mm film thickness after 24 h at 23°C/50% RH. At 3:1 filler loading, shrinkage reaches 3% and fails ASTM C474-15 crack resistance for joint compound. The preferred working band is 4:1 to 4.5:1; viscosity and shrinkage data for this gradient are given in Table 1. Application is by trowel or automatic taping tool; open time on gypsum wallboard is 30–45 minutes, and second-coat adhesion must survive 0.2 N/mm² tensile pull. Terminal products include interior gypsum wallboard seam compound, nail spotting compound, and skim coat base. The compound must not be frozen; storage below 2°C causes latex flocculation that cannot be reversed by simple remixing.
| Filler-to-binder mass ratio | Brookfield viscosity at 0.5 rpm (cps) | 24 h shrinkage (%) | 2 mm crack resistance |
|---|---|---|---|
| 3:1 | 85,000–95,000 | 2.8–3.2 | Fail |
| 4:1 | 150,000–180,000 | 2.0–2.4 | Pass |
| 4.5:1 | 190,000–240,000 | 1.5–1.9 | Pass |
| 5:1 | 260,000–320,000 | 1.2–1.5 | Edge cracking at 2 mm |
Foam application of CW-805 onto 20–40 g/m² air-laid nonwoven webs is adjusted to a pick-up of 8–15 dry parts per 100 parts fiber. The dispersion is diluted to 10–15% solids with deionized water and foamed with air to a blow ratio of 1:6 using a foam generator equipped with a 0.5 mm screen. Addition of 2–5 wt% glyoxal based on dry binder raises wet tensile after through-air drying at 130°C for 2–3 minutes; without glyoxal, wet strength retention is below 30%, whereas with 3 wt% glyoxal retention exceeds 60% in EDANA NWSP 110.4 strip tensile. The crosslinker also lowers formaldehyde release below 16 ppm under EU Ecolabel textile limits only when cure is complete; residual free formaldehyde above 20 ppm occurs if dryer temperature falls below 120°C. Terminal uses are air-laid tabletop wipes, medical examination bed sheets, and feminine hygiene acquisition layers. For cellulose-rich webs, the emulsion pH of 3.5–4.0 must be raised to 5.5–6.0 with sodium bicarbonate before application to reduce fiber acid hydrolysis during storage at 40°C/75% RH. High-shear stability at 10,000 s⁻¹ through the foam mixing head is adequate, but mechanical shear beyond 30 minutes at 1,500 rpm increases particle size from 0.8–1.5 µm to 3–5 µm and reduces dry tensile by 10–15%. Terminal conversion lines require unwinding tension below 0.1 N/mm to prevent binder cracking in machine direction.
When PVC edge banding is substituted by pre-primed polyester foil, CW-805 can be transferred by a heated profiling shoe at 180–220°C without a separate PVA primer. The emulsion is applied to MDF profiles at 60–100 g/m² using a ribbed applicator wheel, then infrared-flash dried for 15–20 seconds at 50–60°C surface temperature to reduce water content to 10–15%. The heated shoe compresses the foil against the profile under 0.3–0.6 N/mm² for 1.5–3.0 seconds, causing the polymer to flow into profile pores. Because CW-805 contains no polyurethane pre-polymer, adhesion to PVC edge banding requires the banding backside to be corona-treated to 38–42 mN/m; untreated PVC at 32 mN/m shows adhesive transfer failure under peel. The terminal product is low-formaldehyde furniture edge banding for office desktops and wardrobe shelves. Shelf peel adhesion measured by EN 14323 exceeds 1.5 N/mm after 7 days at 23°C, but drops below 0.8 N/mm after 24 h water contact unless 2–4 phr ammonium zirconium carbonate is added. The addition raises pH from 3.8 to 5.5 and pot life drops to 6–8 h; therefore mixing is batchwise at the line, not in a central tank. High-frequency edge presses running at 27.12 MHz can reduce cure to 15–20 seconds, but electrode gap variations above 0.3 mm produce edge scorch above 95°C and polymer degradation. This process is not recommended for untreated ABS edge banding because plasticizer migration from ABS to CW-805 reduces shear strength after 30 days by more than 20%.
Roller coating of CW-805 as a maker coat on 120–180 g/m² paper backing for coated abrasives requires careful control of penetration into the paper. The dispersion is thickened with 0.5–1.5 phr hydroxyethyl cellulose to 4,000–6,000 mPa·s so that the coat does not strike through; aluminium oxide grit P80–P120 is then gravity-coated at 600–900 g/m² and oven-cured at 75–85°C for 20–30 minutes. If cure exceeds 90°C, the PVAc film yellows and the paper embrittles; if cure is below 70°C, water retention in the maker coat causes shelling of the abrasive mineral. The terminal product is sandpaper and abrasive discs for woodworking. The maker coat must show a 6 mm pull-off adhesion above 0.4 N/mm² to the paper; poor surface wetting occurs on resin-bonded paper with silicone release residues above 0.1%. This application does not require food-contact compliance, but REACH restrictions on free formaldehyde limit the use of amino-formaldehyde post-cure additives to below 0.1% in the dried film.
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CW-805 PVAc emulsion is a polyvinyl alcohol-stabilised, internally plasticised vinyl acetate polymer dispersion supplied as a ready-to-use waterborne adhesive for absorbent cellulosic substrates. The product has a non-volatile content of 50 ± 2 % by mass when tested according to ISO 3251:2019. Water is the continuous phase; film formation occurs by water loss and coalescence, not by oxidative crosslinking. Low-shear Brookfield viscosity at 23 °C using spindle 6 at 20 rpm falls between 9,000 mPa·s and 13,000 mPa·s. This range permits roller spreading on flat-stock laminating lines without excessive squeeze-out on medium-density fibreboard, particleboard, and hardboard.
The dispersion does not use an added urea-formaldehyde donor. Free formaldehyde is controlled to ≤ 20 mg/kg by acetylacetone spectrophotometry after steam distillation. The pH range at 23 °C is 3.0 to 4.5 when measured according to ISO 976:2013. Specific gravity is 1.07 to 1.09 g/cm³ by ISO 2811:2011, and minimum film formation temperature is ≤ 5 °C by ISO 2115:2021. Residual vinyl acetate monomer is maintained below 0.1 % by mass using headspace gas chromatography with flame ionisation detection. CW-805 is intended for cold-press and high-frequency wood assembly, veneering, paperboard lamination, and tube winding. Substrates must be sufficiently porous to permit water escape; unprimed non-porous films, metal foils, and rigid plastic sheets lie outside the recommended substrate range.
General-purpose D2 homopolymer PVAc dispersions are typically lower in viscosity and set more quickly on absorbent paperboard, but they form softer films and lose adhesion after prolonged wetting. CW-805 differs in its higher solids and plasticised film formation; the film remains coalescent at ≤ 5 °C, and the product is designed to meet EN 204:2016 class D3 for interior wood bonding with occasional condensed-water contact. A D4 crosslinking PVAc requires a separate hardener and imparts higher heat and water resistance, but it introduces pot-life limitations and more demanding two-component metering. A carboxylated VAE dispersion may show better dry tack on selected coated papers, but it generally has lower thermal creep resistance and higher unit cost. CW-805 therefore occupies a middle position: one-component handling with D3 water resistance, but without D4 outdoor durability or VAE adhesion to non-porous polymer films.
| Property | CW-805 | General-purpose D2 PVAc | D4 crosslinking PVAc | Carboxylated VAE |
|---|---|---|---|---|
| EN 204 service class | D3 | D2 | D4 | D2–D3 depending on grade |
| Hardener required | No | No | Yes | No |
| Minimum film formation temperature | ≤ 5 °C | 5–10 °C | 0–5 °C | 0–3 °C |
| Low-shear viscosity at 23 °C | 9,000–13,000 mPa·s | 3,000–8,000 mPa·s | 8,000–20,000 mPa·s | 5,000–15,000 mPa·s |
| Thermal creep resistance | Moderate | Low | High | Low to moderate |
| Adhesion to unprimed PE or PP | Nil | Nil | Nil | Low |
The comparative values above are representative industrial ranges for each polymer class. They are provided to distinguish working properties, not as batch-release specifications for any single product. For CW-805, batch-release viscosity is controlled within ± 1,000 mPa·s of the target value at 20 rpm.
| Property | Typical value | Test method |
|---|---|---|
| Non-volatile content | 50 ± 2 % | ISO 3251:2019 |
| Low-shear viscosity | 9,000–13,000 mPa·s | ISO 2555:2018, Brookfield RVT, spindle 6, 20 rpm, 23 °C |
| pH | 3.0–4.5 | ISO 976:2013 |
| Density | 1.07–1.09 g/cm³ | ISO 2811:2011 |
| Minimum film formation temperature | ≤ 5 °C | ISO 2115:2021 |
| Residual vinyl acetate monomer | ≤ 0.1 % | Internal headspace gas chromatography with flame ionisation detection |
| Free formaldehyde | ≤ 20 mg/kg | Acetylacetone spectrophotometry after steam distillation |
| Shelf life in unopened containers | 12 months at 20 °C | Internal retention test |
The product should be stored in sealed HDPE or 316 stainless-steel vessels. Bulk storage in carbon steel is not recommended because the acidic pH can extract iron and cause grey discolouration. Avoid freezing; PVAc dispersions undergo irreversible coagulation after freeze-thaw cycling. At temperatures below 5 °C, low-shear viscosity increases, but the limiting factor at low temperature is water removal rather than coalescence. When adding antifoam or preservative, the material should be agitated with a low-shear propeller at 200–400 rpm; high-speed dispersion can generate shear-induced foam and destabilise the protective colloid.
Cold-press lamination of wood veneer or honeycomb panels uses spread weights of 120 g/m² to 180 g/m² on the substrate. At 20 °C and 60 % RH, open time is 5–8 minutes; assembly time can extend to 15 minutes when surfaces remain damp but not wet. Press pressure of 0.5 MPa to 1.0 MPa and press time of 15–30 minutes are commonly sufficient for initial handling, but full water resistance develops after 24–72 h of storage. Wood moisture content should be 8–12 %; below 6 %, water is drawn from the adhesive line too quickly and starved bond failure can occur. Above 15 %, water removal slows and press cycles must be extended.
On a production two-roll adhesive spreader with a 300 mm roll width, coating weight variation is typically ± 10 %. Foaming is the main process defect; high-speed roll rotation above 80 m/min can entrain air and reduce contact area. If foam persists, a silicone-free defoamer may be considered at 0.1–0.3 % on total wet weight, but it must be pre-dispersed before addition. Published data for the interaction of specific defoamer grades with CW-805 is limited; plant-scale trials are required because some defoamers reduce wet tack on kraft paper.
EN 204:2016 class D3 is an interior non-structural durability classification covering frequent short-term exposure to running or condensed water and heavy humidity. It does not imply resistance to prolonged outdoor weathering; for exterior exposure, a D4 adhesive is required. In CW-805, D3 performance depends on the polyvinyl alcohol protective colloid and internal plasticisation. The bond line remains hydrated under wet exposure but should retain sufficient tensile shear strength after reconditioning. Testing should follow EN 205:2016 using beech or another control timber. Published independent comparative data for CW-805 is limited; incoming lot validation should include a control adhesive and at least 10 specimens per conditioning sequence. The actual strength after D3 conditioning depends on wood density, spread rate, press time, and open assembly time.
CW-805 can be used in high-frequency wood-assembly lines operating at 27.12 MHz. The adhesive line is heated selectively because water and polymer-bound hydroxyl groups are dielectric susceptors. In edge-gluing presses with 5 kW to 20 kW RF output, bond-line temperature reaches 60 °C to 70 °C within 30–60 s. The processing window is narrow: at 85 °C, steam pressure builds inside the bond line and can cause blowouts or local delamination. Bond-line temperature should be monitored by infrared sensors or embedded thermocouples on tooling; a plateau at 65 °C is usually sufficient for initial handling.
For high-frequency edge banding, spread weight is normally lower than in cold-press application: 100 g/m² to 140 g/m². Viscosity must be high enough to prevent squeeze-out under electrode pressure but low enough to transfer from an edge-band applicator. The recommended application viscosity at 25 °C is 10,000–12,000 mPa·s; batches below 9,000 mPa·s may produce adhesive bleeding at the band edge, while batches above 13,000 mPa·s may show stringing on the applicator roll. The product is shear-thinning, but low-shear viscosity remains relevant for slump resistance after transfer. The upper operating humidity boundary is 65 % RH for open storage of coated components before pressing; above this, the wet adhesive film can absorb atmospheric moisture and lose tack. If coating must occur at higher humidity, forced-air dehumidification of the lay-up area is required.
Paper and paperboard converting operations use CW-805 at lower spread weights than wood assembly. On a 600 mm wide roller coater running at 25 m/min, the applied wet film is 40 g/m² to 80 g/m² depending on substrate absorbency. High-shear viscosity at 100 s⁻¹ drops to 1,500–2,500 mPa·s, reducing pattern-fill defects on corrugated liner. Below 1,200 mPa·s, roller fling and misting increase noticeably, and the lower limit of acceptable roll speed may depend on local exhaust conditions. For tube winding, the wet tack must withstand spring-back of paperboard cores; CW-805 is used without additional tackifier on most kraft and recycled liner grades. Coated papers with high binder content require a quick tack evaluation because the water phase is absorbed slowly and slip can occur at the nip.
Because CW-805 is waterborne and acidic, it should not be mixed with amine-based additives or strongly basic fillers; pH drift above 6.5 reduces wet tack and can destabilise the polyvinyl alcohol protective colloid. The product is not formulated for direct food-contact use, but converters can evaluate finished articles for indirect food-contact compliance under 21 CFR 175.105, EU Regulation 10/2011 where applicable, and Regulation (EC) No 1907/2006 under REACH. For load-bearing structural wood, engineered-wood, or exterior exposure, a D4 structural adhesive should be selected instead.
