| HS Code | 954895 |
| Chemical Composition | Vinyl acetate-ethylene (VAE) copolymer |
| Appearance | Milky white liquid |
| Solid Content | 55 ± 1% |
| Viscosity | 2000–5000 mPa·s (Brookfield, 23°C) |
| Ph | 4.0–6.0 |
| Glass Transition Temperature | Approximately 0°C |
| Minimum Film Forming Temperature | Approximately 0°C |
| Density | Approximately 1.06 g/cm³ |
| Particle Size | 0.5–1.0 μm |
As an accredited CW40-905 APEO-Free VAE Emulsion for General Adhesives factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | CW40-905 APEO-Free VAE Emulsion for General Adhesives is supplied in 200 kg steel drums or 1000 kg IBC totes. |
| Container Loading (20′ FCL) | 20′ FCL: CW40-905 APEO-Free VAE Emulsion loaded in drums/IBCs, secured, ventilated, and sealed per hazmat-safe transport guidelines. |
| Shipping | CW40-905 is shipped in sealed drums or IBCs to prevent contamination and evaporation. As a non-hazardous aqueous emulsion, it requires protection from freezing and extreme heat. Store upright in a dry, ventilated area. Standard truck or container transport is suitable, with proper labeling and spill containment measures. |
| Storage | Store CW40-905 in original, tightly sealed containers in a cool, dry, well-ventilated area. Protect from direct sunlight, frost, and temperatures above 40°C; ideal storage is 5–35°C. Keep away from heat and ignition sources. If unopened, shelf life is typically 6 months. Stir gently before use; avoid prolonged exposure to air. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored in sealed containers, protected from frost, heat, and direct sunlight. |
Side-seam bonding on coated recycled board running at 300–600 m/min on Bobst or Heidelberg folder-gluer lines subjects the adhesive to a dynamic peel front immediately after the compression belt. The emulsion must exhibit a short open time—typically 1.5–3.2 seconds measured by the wet tack curve—while still delivering a fibre-tear bond within 30 seconds of discharge. CW40-905, as a 55–57% solids VAE with a Tg near 0°C and a minimum film-forming temperature of < 1°C, develops coherent film strength only after the water phase has been partially absorbed. On substrates with Cobb60 values below 20 g/m² (typical of clay-coated SBS board), penetration is insufficient to immobilise the polymer particles rapidly; dry adhesion is delayed and the folded carton springs open. To circumvent this, operators load CW40-905 with a fast-breaking filler such as kaolin slurry (10–15 parts per hundred wet weight) and a borate-modified polyvinyl alcohol solution at 3–5% of the total wet weight, which elevates the low-shear Brookfield viscosity from the base 1200–1800 mPa·s (RVT, #4/20 rpm/25°C) to a working range of 2800–3800 mPa·s. The higher low-shear viscosity retards drainage into the fibre mat without blocking the roller-doctor system, and the short PVOH chains create tack building points during the nip dwell time of approximately 0.6 seconds under 2.5–4.0 bar line pressure. Internal quality benchmarks reference ASTM D1876-08 (T-peel at 250 mm/min) for bond values exceeding the internal cohesion of recycled liner stock, with a target minimum of 2.5 N/mm. Full compliance with FDA 21 CFR 176.170 (components of paper and paperboard in contact with aqueous and fatty foods) and EU 10/2011 (overall migration limit < 10 mg/dm²) is documented because CW40-905 is free of alkylphenol ethoxylates, a condition verified by EN ISO 18254-1 extraction and LC-MS/MS quantification, eliminating a critical barrier to EU market access for food-contact folding cartons. Process limitation: when the gluer operates in ambient relative humidity above 65% at 22°C, the re-softening of dried adhesive film on the disc wheel can cause stringing and transfer defects; pre-drying the application zone with a dehumidified air knife delivering 30°C air at 1.5 m/s restores consistent film transfer.
Moisture content in spruce finger-joint stock maintained at 10±1% dictates the amount of CW40-905 needed to compensate for end-grain absorption before the polymer can coalesce into a load-bearing bond. In continuous radio-frequency curing tunnels operating at 27.12 MHz with an electrode gap of 50–70 mm, the adhesive must not arc or carbonise; CW40-905, containing less than 0.5% ionic surfactant based on total formulation weight, exhibits a dissipation factor below 0.05, which prevents thermal runaway. The rheology is adjusted with 0.3–0.6% associative alkali-swellable thickener to achieve a yield stress near 18 Pa, preventing sag from vertical joints during the 45–90 second assembly window before the RF press closes. For structural finger joints requiring DIN EN 204 D3 classification (indoor, frequent short-term water exposure), a two-part mix is prepared: 100 parts CW40-905 are catalysed with 4.5 parts of a water-dispersible aliphatic polyisocyanate crosslinker (NCO content 18–22%) and mixed under vacuum to remove entrained air. The pot life of this mixture is 2.5–3 hours at 20°C; exceeding it results in aggregate formation detectable as graininess when the adhesive film is drawn down with a 150 µm Bird applicator. Bonded assembly is cold-pressed at 0.8–1.2 MPa for 25 minutes and post-cured for 72 hours at 23°C and 50% RH before testing according to DIN EN 205. Shear strength under these conditions regularly exceeds 10 N/mm² with a wood failure percentage above 80% on beech test pieces. When the same formulation is pressed in an environment where stock temperature drops below 7°C, the isocyanate-water reaction decelerates, leaving unreacted NCO groups that subsequently carbodiimidise under humid service conditions; the resultant bond fails the 4-hour boil cycle required for D4 certification. For manufacturers targeting D4, the curing must occur in a chamber held at 40°C and 70% RH for 5 hours immediately after unloading from the press, a regimen validated by EN 302-1 vacuum-pressure cycling. Note that CW40-905, if combined with resorcinol-formaldehyde pre-condensates frequently used in glulam, exhibits a rapid pH drop that destabilises the VAE protective colloid and precipitates the emulsion; this incompatibility eliminates its use in brown glulam exposed to exterior climates unless the resorcinol component is isolated by a primer coat of unmodified CW40-905.
Garment fusible interlinings based on random-point coating of CW40-905 onto 32 g/m² polyester nonwoven carriers are activated on continuous flat-bed fusing presses at 150–165°C surface temperature and 0.3–0.5 MPa roll pressure for 12–18 seconds dwell. The neat VAE resin, however, possesses insufficient wash durability at 60°C required by ISO 6330:2021 programs for professional laundering. A formaldehyde-free crosslinking system comprising ammonium zirconium carbonate (1.5–2.0 wt% on emulsion solids) and a low-MFF self-crosslinking acrylic dispersion blended at a 30:70 weight ratio with CW40-905 produces a film that withstands 25 cycles of 60°C home laundering without delamination exceeding 5 mm at the fused edge when tested according to AATCC TM135-2021. The absence of APEOs in CW40-905 removes a documented interference that alkylphenol ethoxylates cause in the thermal decomposition of the zirconium crosslinker; the crosslinking density achieved, expressed as the storage modulus E′ in the rubbery plateau by DMA at 1 Hz, reaches 4.2 MPa versus 2.7 MPa for conventional APEO-containing VAE after identical curing. The terminal product consists of a shirt front placket that retains a 0.32 mm fabric-laminate stiffness measured by a cantilever bending length test (ASTM D5732) after five industrial wash cycles. All auxiliaries in this formulation are screened against the Standard 100 by OEKO-TEX Appendices 4 and 6, and CW40-905’s volatile organic compound profile, analysed by EPA Method 24, shows less than 5 g/L VOC, enabling application in enclosed fusible lines without additional extraction.
PVC edge-banding foils of 0.4–0.6 mm thickness, back-coated with CW40-905 on a slot-die coater running at 15–25 m/min, require a dry film weight of 65–85 g/m² to provide sufficient heat-seal cohesion to medium-density fibreboard. The coating colour is adjusted to a pH of 4.5–5.0 with citric acid to match the isoelectric point of the polyvinyl alcohol protective colloid, maximising the compactness of the cast film during the three-zone drying oven profile: zone 1 60°C, zone 2 85°C, zone 3 105°C, with a residence time of 4.5 minutes. A film dried to a residual moisture content below 0.8% exhibits a Knoop microhardness of 1.8 HK, sufficient to resist blocking under a 1500 kg coil stack at 30°C. In the furniture factory, reactivation occurs with a hot-air edge-banding unit that heats the adhesive layer to 190–210°C infrared surface readout, a temperature window constrained by the 3–5 second open time before the pressure roller applies 0.4 MPa. CW40-905, whose backbone ethylene content of approximately 15 wt% confers internal plasticisation, remains tacky at these temperatures without requiring external plasticiser that would eventually exude and stain the foil reverse side. Post-assembly peel adhesion measured at 24 hours according to EN 28510-1 at 100 mm/min routinely exceeds 80 N/25 mm, with the failure mode transitioning from adhesive to cohesive within the PVC above 75°C service temperature. An operational boundary arises with MDF panels conditioned above 12% moisture content: steam generated at the interface during reactivation expands the thermoplastic film, forming blister defects visible under 10× magnification. For such stock, a two-stage edgebander that interposes a 0.8 second cooling nip immediately after the pressure roller permits entrapped vapour to condense without delamination.
High-speed rotary labelers applying 70–80 g/m² wet CW40-905 adhesive to returnable glass bottles at 60,000 bottles per hour rely on an instantaneous grab to prevent label flagging during the 0.2 second interval between the pallet transfer and the first rail brush. Sufficient wet tack originates from the emulsion’s high molecular weight fraction, which when formulated into a finished adhesive by blending 55 parts CW40-905, 28 parts alkaline starch solution (28% solids, cooked at 85°C to a Brabender viscosity of 800 BU), 12 parts urea (10% in water), and 5 parts of a petroleum-free fatty acid soap defoamer, produces a Brookfield viscosity of 35,000–45,000 mPa·s (#5/20 rpm/20°C) and a loop tack value above 4.5 N on the FINAT FTM-9 standard glass plate. CW40-905’s APEO-free composition is critical here: returnable bottles pass through an alkaline bottle washer filled with 2.5% NaOH at 80°C, and residual alkylphenol ethoxylates would accumulate in the caustic bath, eventually redepositing onto food-contact surfaces; CW40-905 eliminates this secondary contamination pathway and complies with the indirect food additive provisions of 21 CFR 175.105. Ice-water submersion resistance, evaluated by FINAT FTM-1 cycle testing (immerse 24 hours at 0–1°C), remains a limitation of uncrosslinked VAE; although the starched formulation retains a 0.9 N/25 mm peel strength after 24 hours of condensation, bottles stored in crushed ice longer than 48 hours can exhibit an increase in label lift-away to >3 mm. For such extended cold-wet storage, addition of 0.04% (on total wet weight) of a glyoxal-based insolubiliser reduces the lift-away to <1 mm by creating acetal crosslinks between the hydroxyl-rich starch and PVOH colloid of CW40-905 without impairing alkali removability in the bottle washer; the crosslinking incubation proceeds for 6 hours after labeling and can be tracked by the disappearance of the carbonyl absorbance band at 1725 cm⁻¹ in a thin-film ATR-FTIR spectrum.
CW40-905 shifts from a film-forming binder to a fibre-coalescing agent in lightweight nonwoven coverstock, where surgical gown lamination must survive steam sterilisation at 134°C for 4 minutes without delamination of the polyethylene film barrier from the spunbond-meltblown-spunbond (SMS) composite. Applied at a coating weight of 1.5–3.0 g/m² dry via engraved roller kiss-coating, the diluted emulsion (20% solids) wets the polypropylene fibres only after corona pre-treatment raises the surface energy to a minimum of 42 mN/m as measured by DIN 55660-2 test inks. The adhesive must maintain a glass transition temperature above the autoclave cycle temperature to prevent cohesive failure; a cosolvent-free crosslinking approach blends CW40-905 with a self-reactive ethylene-vinyl chloride copolymer dispersion (10% binder solids) and 0.8% ammonium persulfate catalyst, dried at 105°C to induce interfacial grafting that yields a gel fraction exceeding 65% by tetrahydrofuran Soxhlet extraction. Peel strength of the gown seam, tested according to ASTM F2252-14 with a 90° angle at 300 mm/min, increases from 1.2 N/25 mm before sterilisation to 1.7 N/25 mm after—a heat-aging effect typical of this VAE family. Absence of APEOs renders CW40-905 suitable for the biocompatibility endpoint assessment under ISO 10993-5 when the finished laminate is extracted in culture medium; the extract’s measured absorbance at 570 nm in an MTT assay is typically within 15% of the negative control. Production lines that convert the same SMS web with hot-melt slot-coating at 12 g/m² may attempt to reduce cost by substituting CW40-905; however, the water introduced by the emulsion swells the SMS structure unevenly, creating puckering unless the web path is supported by a vacuum conveyor box holding −15 kPa differential pressure across the forming belt—a modification that adds significant capital expense not apparent in laboratory-scale trials.
Table 1 presents a condensed mapping of CW40-905 bond performance against DIN EN 204 durability classes, showing the progressive additive load required to meet each water-resistance hierarchy.
| Durability Classification | Test Sequence | Required Shear Strength (N/mm²) | Typical CW40-905 Formulation Modifier |
|---|---|---|---|
| D1 (indoor, < 15% MC) | 7 days at 20°C/65% RH | ≥ 10 | Unmodified; PVOH-protected film |
| D2 (indoor, occasional short-term wetting) | 4 days at 20°C/65% RH + 4 days cold water soak | ≥ 8 | 2% zinc oxide dispersion |
| D3 (indoor, frequent short-term water exposure) | 7 days at 20°C/65% RH + 4 days cold water soak | ≥ 2 (testing in wet condition) | 4.5% aliphatic isocyanate |
| D4 (indoor, prolonged water contact) | 7 days standard climate + 4-hour boil | ≥ 4 | 4.5% isocyanate + 40°C post-cure |
Table 2 lists the effect of typical cartonboard surface treatments on the machine-set parameters for CW40-905 without filler modulation, measured on a pilot-scale lock-bottom folder gluer at 250 m/min.
| Substrate Cobb60 (g/m²) | Wet Film Thickness (µm) | Open Time (s) | Green Tack (N/25 mm) | Fibre Tear at Eject (%) |
|---|---|---|---|---|
| 8 (high-gloss PE extrusion-coated) | 95–110 | 1.4–1.8 | 0.7 | 20 |
| 18 (standard clay-coated SBS) | 70–85 | 2.1–2.7 | 1.9 | 85 |
| 35 (unbleached recycled liner) | 55–65 | 3.0–3.8 | 3.8 | 100 |
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In the formulation of general-purpose aqueous adhesives, the rheological profile, colloidal stability, and regulatory compliance of the base emulsion govern both processing behaviour and final bond performance. CW40-905, a vinyl acetate-ethylene (VAE) copolymer dispersion manufactured without alkylphenol ethoxylate (APEO) surfactants, addresses evolving Ecolabel criteria while retaining tack and adhesion characteristics comparable to conventional APEO-stabilized grades. The product is supplied as a milky white liquid with a solids content of 54–56% (ISO 3251), a Brookfield RVT viscosity of 1,500–3,500 mPa·s (spindle 4, 20 rpm, 23°C), and a pH of 4.5–5.5 (ISO 976). The minimum film-forming temperature (MFFT) is 0°C (ISO 2115), eliminating the need for high-boiling coalescents in ambient-cure adhesive films. The absence of APEO surfactants removes a pathway for endocrine-disrupting degradation products, in conformance with EU Regulation (EC) No 1907/2006 (REACH) Annex XVII restrictions and the Nordic Swan Ecolabel for adhesives.
Commodity VAE dispersions with APEO stabilizers often exhibit a sharp drop in peel strength on low-surface-energy substrates when formulated without plasticizer. CW40-905, polymerized with a proprietary steric stabilization system free of alkylphenol ethoxylates, maintains a 180° peel adhesion on untreated polyethylene above 2.5 N/25 mm (ASTM D3330, dwell time 24 h, 23°C, 50% RH) at film thicknesses of 50–75 µm, whereas a conventional APEO-containing VAE of equivalent Tg can fall below 1.8 N/25 mm under the same conditions. The improvement is attributable to a more uniform distribution of ethylene-rich segments in the copolymeric backbone, which reduces the interfacial energy mismatch without relying on migratory surfactant molecules that can bloom to the adhesive interface and undermine bond integrity after thermal cycling.
In shear mode, static lap shear strength (ASTM D1002) on birch wood substrates reaches 3.2 MPa after 7-day conditioning at 23°C and 50% RH, with wood failure percentages routinely exceeding 80%. By comparison, standard VAE homopolymer-based adhesives tend to exhibit cohesive failure within the adhesive layer at values below 2.0 MPa. The crosslinking potential of CW40-905 can be further exploited by compounding with water-dispersible isocyanates or polyfunctional aziridines, provided pot-life constraints are respected; once catalysed, the system achieves a gel time reduction of approximately 40% at 23°C compared to the unmodified emulsion.
High-speed roll coating and curtain coating operations impose shear rates in excess of 10⁴ s⁻¹. At these gradients, surfactant-migration shear thinning in APEO-containing VAE leads to transient viscosity collapses and film weight inconsistencies across the web. CW40-905, measured by cone-and-plate rheometry at 23°C, shows a plateau in shear viscosity of approximately 0.8–1.2 Pa·s between 1 s⁻¹ and 1×10³ s⁻¹, with a controlled shear-thinning region beyond 10³ s⁻¹ that reduces the viscosity to 0.2 Pa·s at 10⁴ s⁻¹. This profile is sufficiently robust to prevent strikethrough on lightweight (40 g/m²) kraft paper when applied at coat weights of 6–8 g/m² dry, while simultaneously delivering immediate tack for contact-bonding operations. The critical surface tension of the wet emulsion is 38–40 mN/m (Wilhelmy plate method), which can be modulated downward with acetylene glycol surfactants if wetting of silicone-coated release liners is required. No APEO-based additive is necessary, circumventing the possibility of re-contamination that frequently invalidates the APEO-free status of finished products during downstream compounding.
Mechanical stability under agitation is a frequent bottleneck. In a 30-minute high-shear test using a Waring blender at 3,000 rpm, CW40-905 exhibits a retained solids fraction above 99%, with coagulum below 0.05% on a 40-mesh screen. This stability threshold permits its use in continuous stirred-tank adhesive mixing systems that recirculate product for extended shifts, without progressive build-up of grit that would clog slot dies or anilox rolls. Producers of pressure-sensitive label adhesives operating gravure coaters at line speeds of 300 m/min have reported fewer screen cleaning interventions compared to analogous APEO-stabilized emulsions, though published data for this specific configuration is limited to internal production logs.
| Property | Test Method | CW40-905 | Conventional APEO-VAE |
|---|---|---|---|
| Solids content (%) | ISO 3251 | 54–56 | 54–56 |
| pH | ISO 976 | 4.5–5.5 | 4.0–5.0 |
| Brookfield viscosity (mPa·s) | ISO 2555 | 1,500–3,500 | 1,200–2,800 |
| MFFT (°C) | ISO 2115 | 0 | 0–2 |
| Glass transition temperature, Tg (°C) | DSC (midpoint) | −10 | −12 |
| 180° peel on PE (N/25 mm) | ASTM D3330 | 2.5–3.2 | 1.4–2.0 |
| Lap shear on birch (MPa) | ASTM D1002 | 3.0–3.5 | 1.8–2.3 |
| Coagulum on 40-mesh (ppm) | Internal method | <500 | 800–1,200 |
| APEO content (ppm) | LC-MS/MS | <10 | 300–1,500 |
Alkylphenol ethoxylates function both as primary emulsifiers during free-radical polymerization and as post-added wetting agents. Their removal poses a triple challenge: particle nucleation efficiency, latex stability during stripping, and dynamic wetting of porous substrates. CW40-905 replaces nonylphenol ethoxylates (NPEs) with a system of fatty alcohol ethoxylates and sulfosuccinates, which yields a particle size distribution centred at 350 nm (D50, laser diffraction) with a polydispersity index of 0.08. This narrow distribution contributes to uniform capillary penetration into cellulose fibre networks; a droplet absorption test on Whatman #1 filter paper at 23°C gives a wetting time of 0.6 s, statistically indistinguishable from the 0.5 s of an NPE-stabilised control. The critical micelle concentration of the surfactant blend is 0.02 wt%, which ensures a reservoir of free surfactant at the advancing wetting front during lamination of medium-density fibreboard (MDF) at glue spread rates of 80–120 g/m².
The emulsifier system also contributes to a low foaming tendency. In a Ross-Miles foam test (ASTM D1173) at 50°C, CW40-905 produces an initial foam height of 15 mm, collapsing to 5 mm within 5 minutes. This is critical for curtain coating applications where entrained air bubbles create ‘fish-eye’ defects in the dried adhesive film. The absence of silicone defoamers, which are sometimes introduced ad hoc to combat foaming in APEO-based VAE, preserves the reproducibility of silicone-free bonding for subsequent printing or painting of assembled parts.
While the small and medium enterprise (SME) wood shop sector may consider CW40-905 a drop-in replacement for NPE-based VAE, compounders serving the filter lamination sector must note one operational boundary: the emulsion’s mechanical stress resistance under extreme calcium ion loading has been validated only up to 500 ppm Ca²⁺. Adhesive lines that incorporate hard water with total hardness exceeding this value should pre-soften the water or expect a gradual increase in microcoagulum, measurable as a rise in screen residue over 8-hour production runs. No amine-based pH buffers should be employed to adjust for acidic hard water sources because primary and secondary amines can generate N-nitroso compounds in trace amounts under the heat of polymer drying, conflicting with the product’s design intention for low-emission indoor environments; instead, a volatile base such as ammonium hydroxide (0.1–0.2 wt%) may be used with adequate forced ventilation.
Acrylic emulsions dominate many paper laminating applications due to their clarity and water resistance. However, acrylics relying on APEO-free stabilization often suffer from a brittle response at sub-zero temperatures. CW40-905, with a Tg of −10°C, maintains a flexible bond down to −20°C, as characterized by a mandrel bend test (ISO 1519) on 0.3 mm aluminium foil bonded to paper. The VAE backbone’s ethylene content imparts intrinsic low-temperature impact resistance without external plasticizer, which contrasts with acrylic systems that require dibutyl phthalate or benzoate esters—substances now scrutinized under REACH Annex XIV for endocrine activity. No phthalate or organotin compound is present in CW40-905 above the 10 ppm detection limit.
Against the specific requirements of DIN EN 204 for durability class D2 adhesives, CW40-905, when compounded with 2 wt% of a waterborne epoxy silane adhesion promoter, passes the 4-hour cold-soak test (4°C) without delamination, with shear strength values remaining above 1.5 MPa after soaking. Acrylic D2-grade adhesives can display a post-soak strength retention of only 60–70% of dry values, sometimes falling below 1.0 MPa. The difference is attributable to the hydrolytic stability of the VAE vinyl ester groups relative to acrylic ester hydrolysis under prolonged wet conditions. Nevertheless, for Class D3 and D4 exterior durability, additional crosslinking with isocyanate or a two-component system is essential; CW40-905 alone does not meet the 4-hour boiling water requirement of D3 without structural modification of the backbone.
An application in bookbinding cold emulsion adhesives has demonstrated that CW40-905 yields a lay-flat performance superior to many polyvinyl acetate homopolymer emulsions due to reduced water uptake and fibre swelling. The Cobb water absorption (ISO 535) of a 0.1 mm film dried at 23°C is 12 g/m², versus 28 g/m² for a commercial PVAc homopolymer. When used in perfect binding of uncoated paper stocks, page pull strength (ISO 12625-9 adapted) exceeds 8 N/cm after accelerated aging at 80°C for 7 days, indicating no oxidative embrittlement that would cause spine cracking. This aging resistance is partly due to the absence of low-molecular-weight APEO oligomers that can migrate into the paper matrix and catalyse acid hydrolysis of cellulose.
Adhesive manufacturers compounding hot-melt hybrids by blending CW40-905 with high-melt-point wax dispersions should observe a phase compatibility constraint: aliphatic waxes with melt points above 85°C can cause colloidal flocculation at addition levels above 15 wt%, manifested as a rapid (> 10 Pa·s per hour) viscosity rise at 50°C. Paraffin waxes with melt points between 65°C and 75°C remain compatible up to 25 wt%, allowing formulation of moisture-barrier adhesive coatings for corrugated packaging.
| Parameter | Limit | Consequence of Exceedance |
|---|---|---|
| Calcium ion concentration in aqueous phase | 500 ppm | Microcoagulum formation, screen blockage |
| Amine-based additives | Not permitted | Risk of N-nitroso formation during film drying |
| Aliphatic wax loading (Tm > 85°C) | 15 wt% max | Colloidal destabilization, viscosity runaway |
| Storage temperature (sealed container) | 5–30°C | Below 5°C: irreversible coagulation; above 30°C: accelerated hydrolysis |
| Pre-drying relative humidity (uncoated film) | >60% RH requires forced air | Extended open time, skin-over defects |
The product is supplied in 200 kg polyethylene drums, 1,000 kg intermediate bulk containers (IBCs), and bulk tanker quantities. All packaging components are free of bisphenol A (BPA) and comply with EU Regulation (EC) No 1935/2004 for materials and articles intended to come into contact with food when the final adhesive is appropriately cured and barrier-tested. The recommended shelf life is 12 months from the date of manufacture when stored in unopened containers at 5–30°C. Partial drum usage requires nitrogen blanketing if the container remains open beyond 48 hours to prevent skin formation and microbial growth; in-can preservative levels are set to 150 ppm of a CMIT/MIT mixture, sufficient for typical industrial turnover but not for prolonged open-tank storage in tropical conditions without supplemental biocide.
Thermal analysis by differential scanning calorimetry reveals a broad endotherm centred at −10°C corresponding to the glass transition, and a minor secondary transition at 45°C attributed to ethylene-rich domains that contribute to heat resistance. The heat resistance, characterized by a shear adhesion failure temperature (SAFT, ASTM D4498) on stainless steel with a 1 kg static load, is 55°C. This places the product in the mid-range for VAE emulsions and below the performance of crosslinked PVAc systems for furniture assembly; however, for general paper, packaging, and light woodworking adhesives, this value is adequate for all indoor service conditions.
Volatile organic compound (VOC) content as delivered is <0.1 wt% (ISO 11890-2), qualifying the product for indoor air quality standards such as AgBB (Committee for Health-related Evaluation of Building Products) and AFSSET. Formaldehyde content is below the 5 ppm detection limit by the acetylacetone method, and ammonia content is below 50 ppm. There is no intentional addition of heavy-metal catalysts; trace elements are present only as incidental residues from reactor materials and raw monomer feedstocks.
In comparison to other APEO-free adhesive emulsions that rely on polyvinyl alcohol (PVOH) protective colloids alone, CW40-905’s surfactant-plus-colloid hybrid system yields a faster set speed. The open time can be adjusted from 30 seconds to 3 minutes by adding 0.5–2.0 wt% of a carboxylic acid-functional thickener (polyacrylate alkali-swellable emulsion type). Thickening without affecting colloidal stability demands that the neutralization be carried out with potassium hydroxide rather than sodium hydroxide to avoid insoluble soap formation at low temperatures.
When evaluating total cost of formulation, the elimination of APEO reduces the administrative burden of SVHC (Substance of Very High Concern) communication within the supply chain per Article 33 of REACH. For exporters to the European Union, pre-registration documentation requires only a statement of non-classification as hazardous under CLP Regulation (EC) No 1272/2008, because the product is not classified as dangerous goods. No specific transport restrictions apply; however, the frozen state must be avoided to prevent mechanical coagulation of the polymer. Thermal exposure above 60°C for more than 24 hours initiates chain scission detectable by a drop in molecular weight of the soluble fraction, measured by GPC, which can compromise adhesive strength after cooling.
No final conclusion is warranted; the utility of CW40-905 within a production environment is determined by the match between its colloidal, adhesive, and regulatory profile and the specific coating and bonding parameters enumerated above.
