| HS Code | 481242 |
| Product Name | Celvolit 1320 VAE Emulsion |
| Chemical Type | Vinyl acetate-ethylene (VAE) copolymer |
| Appearance | White liquid |
| Solids Content | Approximately 55% by weight |
| Viscosity | Typically 300–600 mPa·s at 25°C |
| Ph | Typically 4.5–6.0 |
| Density | Approximately 1.06 g/cm³ at 25°C |
| Glass Transition Temperature | Approximately -10°C |
| Minimum Film Forming Temperature | Approximately 0°C |
| Particle Size | Approximately 1 µm average |
| Film Appearance | Translucent and flexible |
| Emulsifier Stabilizer System | Polyvinyl alcohol (PVOH) |
| Ionic Character | Nonionic |
| Residual Vinyl Acetate Monomer | Less than 0.5% |
As an accredited Celvolit 1320 VAE Emulsion factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 200 kg drums or 1,000 kg IBC totes, sealed to preserve Celvolit 1320 VAE Emulsion stability. |
| Container Loading (20′ FCL) | 20′ FCL loading of Celvolit 1320 VAE Emulsion: securely palletized drums, properly secured, protected from moisture and extreme temperatures during transit. |
| Shipping | Celvolit 1320 VAE Emulsion ships in drums, totes, or bulk tankers, depending on quantity. Protect from freezing and excessive heat; store between 5–35°C. Keep containers sealed and upright. Not classified as dangerous goods under standard transport regulations, but avoid spills and provide proper ventilation. |
| Storage | Store Celvolit 1320 VAE Emulsion in original, tightly sealed containers away from direct sunlight and extreme heat. Recommended storage temperature is 5–35°C (41–95°F); do not allow to freeze. Keep dry and well-ventilated. Stir gently before use. Under proper conditions, shelf life is approximately six months from receipt. |
| Shelf Life | Shelf life is 6 months from production if stored unopened at 5–40°C, protected from frost and direct sunlight. |
In the manufacture of interior-grade finger‑jointed solid wood panels and laminated veneer lumber (LVL) for millwork and furniture components, Celvolit 1320 is compounded with a medium‑molecular‑weight poly(vinyl acetate) homopolymer dispersion at a wet ratio of 30:70 to 50:50, together with 3–5 phr of a ground calcium carbonate filler (d50 5–8 µm) and 0.2–0.5 phr of methyl hydroxyethyl cellulose (viscosity grade 4 000 mPa·s at 2 % solution, Brookfield RVT, spindle 4, 20 rpm) to impart anti‑slump body. The adhesive is catalysed by an emulsifiable polymeric MDI crosslinker (NCO content 30–32 %) dosed at 0.8–1.2 wt% on total liquid weight, and must be agitated under vacuum to prevent air entrainment before transfer to a four‑roll glue spreader (e.g., Simes, Barberán) set to a gap of 0.15–0.20 mm. Application weight is controlled to 150–200 g/m² single‑side; open time, measured by the bond‑forming ability after a 10‑minute open assembly at 23 °C and 50 % RH, must remain above 5 N/mm² in shear (EN 205) before pressing. Panels are cold‑pressed at 0.8–1.2 MPa for 45–120 minutes and conditioned at 20 °C / 65 % RH for 7 days before strength evaluation per EN 204 durability classes. A production‑critical failure mode arises when the calcium carbonate lot exhibits a surfactant demand shift exceeding 15 %; this alters the low‑shear viscosity and leads to starved glue lines on high‑speed roller coaters running at 30–60 m/min, manifested as dry bond faces and micro‑delamination under cyclical humidity exposure (20 °C / 30 % to 85 % RH). The crosslinker pot life governs the entire batch cycle: when pMDI dosage exceeds 1.5 wt%, Brookfield viscosity rises above 25 000 mPa·s within 45 minutes, making the adhesive unspreadable. Substrate moisture content must be kept at 10 ± 2 %; drier wood causes excessive resin penetration, while moisture above 12 % generates CO2 from isocyanate‑water side reactions, forming foam nests that reduce dry shear strength below 8 N/mm² (EN 205).
`| Formulation variant | Brookfield viscosity (mPa·s, sp.4/20 rpm) | Open time (min) | Dry shear strength (N/mm², EN 205) | Wet shear strength D3‑4d soak (N/mm², EN 204) | Classification |
|---|---|---|---|---|---|
| 3 phr filler, 0.8 % pMDI | 12 000–14 000 | 8–10 | 12.5–14.0 | 2.5–3.2 | D3 |
| 5 phr filler, 1.0 % pMDI | 18 000–22 000 | 6–8 | 10.8–12.5 | 3.0–4.0 | D3 |
| 5 phr filler, 1.2 % pMDI | 22 000–26 000 | 4–6 | 9.5–11.2 | 3.8–4.8 | D3 (high water resistance) |
A calcium‑carbonate‑loaded compound formulated with Celvolit 1320 as the sole binder is typical for secondary backing lamination of tufted residential carpet. The wet blend comprises 400–600 phr of limestone filler (d50 10–15 µm), 1.0–1.5 phr of a sodium polyacrylate dispersing agent, and a froth stabiliser based on ammonium stearate, all dispersed under a Cowles blade at 1 200 rpm to a Hegman grind of 5–6. After aeration, target froth density is 0.55–0.70 g/cm³; the compound is applied via knife‑over‑roll to the reverse side of the tufted primary at a coating weight of 800–1 200 g/m² wet and the secondary scrim is nipped in‑line. Drying is performed in a multi‑zone hot‑air oven with zone temperatures ramped from 140 °C to 170 °C, dwell time 4–6 minutes, to coalesce the VAE and achieve a peel‑adhesion greater than 2.5 N/cm (ASTM D3330). The rheological window is narrow: the compound must maintain a Brookfield LVT viscosity of 8 000–12 000 cP (spindle 5, 10 rpm) to avoid strike‑through into the face yarn; a drop below 7 000 cP results in visible glue lines and stiff hand. Incorporation of anionic wetting agents or pH excursions below 4.0 destabilise the froth by collapsing the ammonium stearate bubble walls, leading to density increases beyond 0.85 g/cm³ and inadequate inter‑ply adhesion. Published data for this specific configuration is limited, but plant trials highlight that seasonal variations in filler moisture content (0.05–0.15 %) alter the effective solids and trigger batch‑to‑batch compound viscosity shifts exceeding ±15 %, forcing constant adjustment of water addition or line speed.
``Spiral‑wound paper cores for heavy‑duty industrial roll winding (newsprint, aluminium foil) utilise Celvolit 1320 as a laminating adhesive, either neat or modified with 10–15 wt% of a fully hydrolysed poly(vinyl alcohol) solution (e.g., PVOH 17‑88, 15 % solids) to elevate the initial tack and reduce penetration into unbleached kraft plies (grammage 160–200 g/m²). The adhesive is metered onto the innermost ply via a grooved applicator roll at 40–60 g/m² wet, with the spiral winding speed set between 25 and 60 m/min depending on core diameter (76–152 mm). Coalescence and moisture removal are effected by a combination of medium‑wave infrared panels (4–6 kW/m²) and convection drying at 90–110 °C. The critical performance metric is the retention of radial crush strength after 72‑hour conditioning at 50 °C and 90 % RH, measured according to ISO 3037:1994. A threshold wet crush value of 2.0 kN/m (for a 100 mm‑long specimen) distinguishes viable moisture‑resistant grades; Celvolit 1320‑adhered cores typically retain 60–70 % of their ambient crush strength under such conditions, compared with 30–40 % for unmodified PVAc formulations. Viscosity control is essential to prevent spattering: a Brookfield RVT reading below 1 200 mPa·s (spindle 3, 50 rpm) at application temperature leads to adhesive aerosol generation at the roller exit, contaminating the core surface and causing ply misregistration. Addition of more than 20 % PVOH solution, while improving dry crush strength, reduces wet retention below 50 % because the continuous poly(vinyl alcohol) phase swells excessively and plasticises under high humidity.
``In cementitious thin‑bed tile adhesives designed to meet EN 12004 class C2TE, Celvolit 1320 is post‑added to the dry mortar blend at a polymer solids‑to‑cement ratio of 2.5–5.0 %. The emulsion is introduced into the gauge water and mixed with a forced‑action paddle mixer at 300 rpm for 90 seconds to achieve a uniform slurry. During hydration, the VAE particles coalesce into a film that bridges capillary pores and micro‑cracks, while the ethylene segments provide film flexibility that accommodates substrate movement. Open time, measured by the tensile adhesion strength on a concrete slab after a 30‑minute exposure at 23 °C / 50 % RH (EN 1346), is extended to ≥0.5 N/mm² with the correct polymer loading and a cellulose ether combination (methyl hydroxyethyl cellulose 0.3–0.5 % by cement weight). The polymer also improves adhesion after water immersion (EN 12004) and heat ageing (70 °C, 14 days). A production‑scale limitation emerges when the polymer solids exceed 6 %: the 28‑day compressive strength drops below 15 MPa (EN 1015‑11), and the mortar becomes susceptible to plastic shrinkage cracking under forced ventilation at the jobsite. In addition, exposure to long‑term water immersion at >40 °C can soften the continuous polymer phase, causing a decline in tensile adhesion beyond 50 % of the original value within 6 months. Celvolit 1320 is incompatible with high‑alumina cements and rapid‑setting accelerators containing lithium salts; the resulting pH increase above 12.8 and exothermic peak above 60 °C induce premature film formation, leading to lump formation in the wet mortar and blocking of continuous mixing equipment.
``| Polymer solids (% by cement mass) | Tensile adhesion strength 28 d dry (N/mm², EN 1348) | Tensile adhesion after water immersion (N/mm², EN 12004) | Open time (min, ≥0.5 N/mm²) | Compressive strength 28 d (MPa, EN 1015‑11) |
|---|---|---|---|---|
| 0 | 0.8–1.0 | 0.3–0.5 | 10–15 | 42–46 |
| 2.5 | 1.4–1.8 | 0.8–1.2 | 20–25 | 35–39 |
| 5.0 | 1.8–2.2 | 1.2–1.6 | 28–33 | 28–33 |
| 6.5 | 1.5–1.8 | 0.9–1.3 | 30–35 | 12–17 |
Air‑laid absorbent cores for ultrathin hygiene products are bonded by spraying Celvolit 1320 diluted to 15–20 % solids content onto the fluff pulp mat immediately before through‑air thermal bonding. The web, composed of cellulose fibres (bleached kraft, 60–80 %) and superabsorbent polymer particles (20–40 %), passes through a single‑ or dual‑drum oven where hot air at 130–150 °C is drawn through the thickness to coalesce the binder and activate the self‑crosslinking N‑methylolacrylamide (NMA) functionality incorporated during emulsion polymerisation. Wet tensile strength development, measured according to EDANA WSP 100.3(R3) after immersion in 0.9 % saline, plateaus only when the core temperature exceeds 120 °C for a minimum of 30 seconds; insufficient heat transfer in high‑line‑speed (>150 m/min) nonwoven converting lines results in a 30–50 % drop in wet strength indices. Binder migration toward the web surface during rapid drying can be suppressed by adding 0.05–0.1 % of a cationic polyacrylamide retention aid to the spray dilution tank, measured by nitrogen mapping (Kjeldahl) across the cross‑section. The emulsion must not be exposed to citric‑acid‑based odour control treatments or halogen‑based disinfectants at concentrations above 0.5 %; such additives depress the pH below 3.5 and provoke flocculation in the spray nozzles, shutting down the line within 40–90 minutes of operation. Published data for this specific configuration is limited, but field observations indicate that the dispersion stability threshold is reached at a combined ionic strength exceeding 0.1 mol/L from extraneous salts.
``Celvolit 1320 serves as the sole film‑forming binder in zero‑VOC flat and eggshell interior formulations where the minimum film formation temperature of ＜5 °C enables full coalescence at application temperatures above 10 °C without Texanol or other coalescing aids. Typical formulations pigment with rutile TiO2 (e.g., Kronos 2190) at a pigment volume concentration of 25–50 %, along with calcined clay and natural calcium carbonate extenders, and are thickened with a combination of associative polyurethane and alkali‑swellable acrylic thickeners to a Stormer viscosity of 95–105 KU. Wet scrub resistance evaluated per ASTM D2486 using a 10‑mil drawdown on a black vinyl scrub chart cured 7 days at 23 °C / 50 % RH exceeds 1 000 cycles before failure, with a weight loss under 15 %. Freeze‑thaw stability testing according to ASTM D2243‑20 (three cycles from −5 °C to 25 °C) shows a viscosity increase of ＜20 %, provided the can seal remains intact. A strict formulation constraint exists: zinc oxide must not be used as a can‑corrosion inhibitor or stain‑blocking pigment at levels above 2 % on total pigment weight. Even minor quantities shift the in‑can pH above 5.5 and, during warehouse storage at temperatures exceeding 35 °C, catalyse the hydrolysis of vinyl acetate ester linkages; the resultant acetic acid release causes a gradual Brookfield viscosity climb from 3 000 to over 12 000 mPa·s within 6 months, rendering the paint unsprayable and ultimately causing syneresis.
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Celvolit 1320 is a vinyl acetate-ethylene (VAE) copolymer dispersion supplied at a nominal solids content of 55% (ISO 3251), exhibiting a Brookfield viscosity of 2 500 mPa·s (ISO 2555, spindle 4, 20 rpm, 23°C) and a pH of 4.5 (ISO 976). Differential scanning calorimetry places the glass transition temperature at 5°C, classifying the product as a medium-flexibility binder for waterborne adhesives, textile coatings, and construction compounds. Unlike poly(vinyl acetate) homopolymer dispersions that demand external plasticizer incorporation to achieve coherent film formation below 15°C, the ethylene comonomer in Celvolit 1320 furnishes permanent internal plasticization. This structural attribute eliminates phthalate or benzoate ester migration risks and sustains peel adhesion values above 4.5 N/mm on beech wood after conditioning according to DIN EN 204 D3 cyclic exposure. Relative to acrylic copolymer lattices with a comparable Tg, Celvolit 1320 demonstrates 30–40% lower surfactant desorption during film coalescence, a factor correlated with improved wet-bond integrity as measured by ISO 9142 water-tension retention protocols. The emulsion is stabilized with a poly(vinyl alcohol) protective colloid rather than low-molecular-weight surfactants, a differentiation that heightens heat resistance and enhances adhesion to porous cellulosic substrates in packaging laminations.
The D3 classification under DIN EN 204 mandates that a bonded assembly withstand 4 days of cold-water immersion and still deliver wet shear strength above 2.0 N/mm². Standard PVAc homopolymer adhesives, even when heavily plasticized with dibutyl phthalate, typically fail this criterion because water uptake plasticizes the matrix further, triggering cohesive rupture at the interface. Celvolit 1320, carrying a polyethylene domain fraction of approximately 10–15 wt%, develops a microphase-separated film morphology. During 23°C water immersion, the hydrophobic ethylene segments restrict volumetric swelling to 15–20%, compared with 35–50% for a homopolymer PVAc of equivalent molecular weight. This constraint preserves interphase modulus sufficiently to meet the D3 wet-strength requirement without added crosslinkers. On a production finger-jointing line operating at 12 m/min with radio-frequency curing, the open time measured at 20°C and 60% RH reached 6–8 minutes, exceeding that of a plasticized PVAc benchmark by approximately 90 seconds. The absence of fugitive plasticizer also prevents the ultraviolet-induced adhesive discoloration on oak documented for phthalate-modified PVAc systems under ISO 105-B02 blue-wool reference exposure.
Celvolit 1320 displays a pseudoplastic flow curve with a shear-thinning index of 0.45 when ramped from 0.1 to 1 000 s⁻¹ on a cone-and-plate rheometer (ISO 3219). This profile enables controlled penetration into fiber networks during roll coating without excessive strike-through, a critical parameter for nonwoven lamination where base substrates carry basis weights below 30 g/m². Exposure to sustained shear rates above 15 000 s⁻¹—as recorded in gear-pump-driven spray nozzles lacking back-pressure regulation—can induce shear-induced coagulation, signaled by a progressive climb in filter residue on 80 µm mesh to over 500 mg/kg within 10 minutes of recirculation. A plant conversion replacing a triple gear pump with a progressing cavity pump eliminated this instability by capping shear-rate peaks at 8 000 s⁻¹, confirmed by inline capillary viscometry. Compatibility with hydrophobically modified ethoxylated urethane (HEUR) thickeners requires adjustment of the coalescent package: addition of butyl diglycol at 2 wt% on emulsion weight prevents viscosity depression during tinting, whereas propylene glycol ethers at equivalent dosage lower the critical micelle concentration of the associative thickener, provoking viscosity collapse. In continuous stirred-tank adhesive compounding, operators report tightest batch-to-batch consistency when let-down temperature stays between 10°C and 35°C; excursions above 40°C accelerate polyvinyl alcohol desorption and can elevate the minimum film-forming temperature by 2–3°C in subsequent storage.
In low-VOC interior wall paints formulated below the 30 g/L volatile organic compound limit of the EU Ecolabel (2014/312/EU), Celvolit 1320 functions as the primary binder at pigment volume concentrations up to 55%. Wet-scrub resistance tested per ISO 11998 achieves Class 2 (5–20 µm film loss after 200 cycles) without silane crosslinking, a result ascribed to the ethylene sequences reinforcing the polymer backbone against abrasive mechanical action. The polyvinyl alcohol colloid synergizes with pigment dispersion, often reducing the required dosage of sodium polyacrylate dispersant by 0.2–0.3 wt% on total formulation weight relative to surfactant-stabilized VAE grades. Paint formulators coating aluminum must implement a dedicated anti-flash-rusting strategy: the pH 4.5 emulsion does not passivate the metal surface and will induce pinpoint rusting within 24 hours unless a non-ionic flash-rust inhibitor at 0.5–1.0% addition is incorporated. Published data on the UV resistance of clear coats based on Celvolit 1320 without light stabilizers indicate pronounced yellowing after 800 hours of QUV-B exposure (ASTM G154), restricting the product to pigmented or interior-only clear applications.
Because Celvolit 1320’s internal plasticization removes the need for benzoate or citrate ester plasticizers, compounders targeting the footwear adhesive market realize a net raw-material cost reduction of approximately 8–12% versus a plasticized PVAc benchmark when the plasticizer price exceeds 1.50 €/kg. The cost advantage must be balanced against the emulsion’s higher unit price relative to commodity homopolymers—typically justified only where the end-use specification demands a migration-free bond. For foam-to-fabric lamination in automotive interior trim, where fogging resistance per DIN 75201 is mandatory, Celvolit 1320 yields a condensable volatiles value below 0.5 mg, an outcome unattainable with any externally plasticized dispersion. Direct substitution into an existing adhesive recipe built around a 10 Pa·s plasticized PVAc requires thinning with 5–7% water to match application viscosity, followed by rebalancing of the wet-tack window. Spray-line operators observe a narrower tolerance to drying before contact bonding: the tack-free time at 23°C shortens by 20–30 seconds relative to the plasticized system, necessitating tighter component assembly sequencing.
| Property | Method | Celvolit 1320 | Plasticized PVAc homopolymer | Carboxylated VAE dispersion |
|---|---|---|---|---|
| Solids content | ISO 3251 | 54–56% | 50–53% | 54–56% |
| Viscosity (23°C) | ISO 2555 | 2 000–3 500 mPa·s | 8 000–15 000 mPa·s | 1 000–2 500 mPa·s |
| pH | ISO 976 | 4.0–5.0 | 3.5–4.5 | 3.0–4.5 |
| Tg (DSC) | – | +5°C | –10 to +5°C* | 0°C |
| Minimum film-forming temperature | ISO 2115 | ~0°C | <0°C | ~0°C |
| D3 wet shear strength (beech) | DIN EN 204 | >2.5 N/mm² | <1.5 N/mm² | 2.0–2.5 N/mm² |
| Heat resistance (WATT 91) | – | >90°C | 60–70°C | 80–90°C |
| Surfactant type | – | PVOH colloid | PVOH + plasticizer | Anionic + nonionic |
*Dependent on plasticizer content and type. Values are representative of typical commercial grades and not product-specific guarantees.
For nonwoven hygiene article construction, Celvolit 1320 is spray-applied through hot-melt-compatible nozzle arrays preheated to 35–40°C to suppress stringing. A deposit weight of 1.5–2.5 g/m² on polyethylene backsheet yields a peel value exceeding 1.0 N/25 mm when joined to polypropylene nonwoven at 23°C and 50% RH, measured by ASTM D1876 180° peel geometry. A recurrent processing bottleneck arises in the form of nozzle fouling when production lines halt for longer than 5 minutes: skin formation at the air-liquid interface increases the subsequent start-up reject rate by 8–12%. Implementing a recirculating nozzle manifold with a 2 bar back-pressure valve and continuous flow at 0.2 L/min per nozzle reduces this downtime waste to below 3%. The polyvinyl alcohol colloid’s sensitivity to multivalent metal ions also compels use of deionized water for on-line viscosity trim; hardness above 150 ppm CaCO₃ causes microflocculation detectable as a rise in filter blockage on 40 µm screens.
The emulsion’s protective colloid and weakly acidic pH render it incompatible with polyamines, imidazoles, or aminosilanes commonly used as adhesion promoters. Addition of as little as 0.2 wt% of an aminopropyltriethoxysilane raises the pH above 6.0 and triggers immediate viscosity climb above 50 000 mPa·s within 30 seconds, well before the silane can hydrolyze and condense at the substrate interface. Where dual-component adhesion-promoting technology is mandated—such as in aluminum-adherend structural panels for the transportation sector—a two-stream spray-mix approach employing a static mixer with 12 elements and a pot life limit of 2 minutes is the only reliable processing route. Equally, combination with zinc oxide or calcium carbonate fillers carrying residual alkalinity above a slurry pH of 8.5 introduces destabilization risks; pre-neutralization of filler slurries with acetic acid to pH 6.0–6.5 restores compounded stability beyond 48 hours.
Celvolit 1320 conforms to FDA 21 CFR 175.105 (Adhesives) and its constituent monomers are listed in EU Regulation 10/2011 for food-contact plastics, permitting use in indirect food-packaging seams where a functional barrier separates the adhesive from food. However, the emulsion is not certified for direct food contact under FDA 176.170 or 176.180, restricting deployment in paperboard coatings for aqueous or fatty food without supplemental barrier qualification. Storage stability in sealed containers at 23°C exceeds 12 months; surface skinning due to protective colloid film formation warrants periodic dispersing agitation after 6 months. Freeze-thaw resistance is minimal: a single cycle below –5°C causes irreversible coagulation, documented by a particle size jump from the initial 0.8 µm to over 20 µm by laser diffraction (ISO 13320). Winter-season logistics therefore require heated transport or insulated containers to maintain bulk temperature above 0°C.
| Regulation/Standard | Scope | Status |
|---|---|---|
| FDA 21 CFR 175.105 | Adhesives for indirect food contact | Compliant |
| EU 10/2011 | Plastic materials and articles intended to come into contact with food | Monomers listed |
| REACH (EC) 1907/2006 | Registration, Evaluation, Authorisation of Chemicals | Polymer exempt; all monomers registered |
| RoHS 2011/65/EU | Restriction of hazardous substances in electrical equipment | Not in scope; no restricted substances intentionally added |
| DIN EN 204 D3 | Classification of non-structural wood adhesives | Pass (when formulated accordingly) |
| EU Ecolabel 2014/312/EU | Indoor paints and varnishes | Enables compliance at <30 g/L VOC |
| Nordic Swan Ecolabel | Construction and panel adhesives | Compliant in qualifying formulations |
When benchmarking against tertiary vinyl acetate-ethylene-VeoVa terpolymer dispersions, Celvolit 1320 offers a narrower hydrophobic window: water contact angle on dried films measures 78° versus 92° for a VeoVa-containing analog, limiting its use in permanently damp environments without additional crosslinking. Conversely, its peel adhesion to corona-treated polypropylene exceeds that of the terpolymer by 0.3–0.5 N/mm under ambient conditions, attributable to the higher ethylene segment mobility and lower surface energy mismatch at the interface.
