| HS Code | 155561 |
| Vinyl Acetate Content | 28% |
| Melt Index | 43 g/10min (190°C/2.16kg) |
| Density | 0.950 g/cm³ |
| Melting Point | 76°C (DSC) |
| Vicat Softening Point | 49°C |
| Glass Transition Temperature | -36°C |
| Hardness | 84 Shore A |
| Tensile Strength | 8.5 MPa |
| Elongation At Break | 900% |
| Brittleness Temperature | -76°C |
| Crystallinity | Approximately 20% |
| Moisture Content | Max 0.05% |
As an accredited Ateva 2825A EVA Copolymer Resin,28% VA,43 MI,Hot Melt Adhesive Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg multi-layer bags, 40 bags per pallet (1,000 kg), shrink-wrapped and labeled for safe handling. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with Ateva 2825A EVA copolymer resin, 28% VA, 43 MI, hot melt adhesive grade. |
| Shipping | Ateva 2825A EVA Copolymer Resin is shipped as free-flowing pellets in 25 kg multi-wall paper bags or 500 kg supersacs. Keep dry, ventilated, and away from heat, sparks, and direct sunlight during transport. Not classified as hazardous, but secure loads to prevent bag damage. Ideal for hot melt adhesive processing. |
| Storage | Store Ateva 2825A EVA copolymer resin in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and open flames. Keep original containers tightly sealed to prevent moisture contamination and dust accumulation. Avoid storing near oxidizers or strong acids. Ideal temperature below 30°C. Properly stored, the hot melt adhesive grade resin remains stable with a long shelf life. |
| Shelf Life | Shelf life is typically two years when stored unopened in a cool, dry area away from heat and sunlight. |
For high-speed corrugated case sealing on packaging lines running at 60–120 m/min and compression belt velocities of 0.8–2.0 m/s, Ateva 2825A is compounded into a case-sealing hot melt at a resin addition of 28–35 wt% alongside a partially esterified rosin tackifier at 35–45 wt%, a Fischer–Tropsch or paraffin wax at 15–25 wt%, and a hindered phenolic antioxidant at 0.3–0.8 wt%. Hot-melt compounding for this segment is typically run on a co-rotating twin-screw extruder with 40:1 L/D and vacuum devolatilization at 130–150 °C to keep residual acetic acid below 50 ppm; batch kneaders are usable only if nitrogen blanketing is maintained. The resin’s 28% VA content provides polar adhesion to sized kraft and clay-coated board, while its 43 g/10 min melt index measured per ISO 1133-1:2022 at 190 °C and 2.16 kg lowers melt viscosity enough for non-contact slot nozzle application at 160–175 °C. Typical molten viscosity in the application head is 1,500–3,500 mPa·s per ASTM D3236-15. Open time is 1–4 s, compression time under 0.1–0.3 MPa belt pressure is 0.5–2.0 s, and the joint reaches fiber-tearing bond strength on virgin kraft below 2 s. Indirect food contact status is assessed under FDA 21 CFR 175.105; the neat resin may be evaluated as an ethylene-vinyl acetate copolymer under 21 CFR 177.1350 when the adhesive is intended for food-packaging laminates. REACH (EC) No 1907/2006 applies to monomer residues and processing aids. Terminal finished articles are corrugated shippers for frozen and chilled foods, beverage multi-packs, and e-commerce consumer-goods cartons. The operational boundary is that heated hose and nozzle setpoints above 185 °C accelerate vinyl acetate elimination and release acetic acid; lines that stop for more than 20 min require recirculation or temperature reduction to 120 °C to avoid char formation.
In bookbinding perfect-binder lines operating at 18,000–25,000 cycles/h, the hot melt is compounded at EVA loadings of 30–38 wt% with rosin ester tackifiers at 35–45 wt%, microcrystalline or Fischer–Tropsch wax at 10–20 wt%, and antioxidant at 0.3–0.8 wt%. The 28% VA repeat-unit polarity improves wetting of clay-filled coated covers and bleached kraft signatures; the 43 g/10 min melt flow value reduces stringing during roller transfer from the heated pot at 150–170 °C. Open time from the dotted applicator roller to the cover nipping station is 1–3 s; set time under 0.3–0.6 MPa clamp pressure is 3–8 s. The finished spine must resist page pullout at 0–5 °C and repeated flexing, evaluated by page-pull methods adapted from ISO 11339:2022 T-peel and heat-fail testing per ASTM D4498-07. Print finishing converters commonly specify page-pull minima above 5 N/cm for 80 g/m² coated paper. Compliance for general softcover books is REACH (EC) No 1907/2006 Annex XVII; for children’s books intended for children under 3 years, EN 71-3:2019 migration limits may apply to the adhesive film if accessible. Terminal products include softcover trade editions, catalogs, directories, and annual reports. A limitation is that this 28% VA grade plasticizes slightly at 45–55 °C, so bound products should not be transported through non-climate-controlled summer rail routes above 60 °C without conditioning.
Hot-melt pressure-sensitive label coating with a slot die at 15–30 g/m² dry adhesive weight uses Ateva 2825A at lower loadings of 18–25 wt% in a formulation where 45–55 wt% rosin ester or C5/C9 tackifier and 15–25 wt% naphthenic oil or low-aromatic process oil provide room-temperature tack, while the EVA domains contribute cohesion and clean die-cut release. The resin’s 28% VA content broadens compatibility with polar tackifier resins and reduces phase separation during extended run times in a 120–150 °C heated slot die coater with a 0.3–0.5 mm shim gap. Coating onto 60–90 μm silicone release liner at 50–150 m/min requires melt viscosity between 2,000 and 8,000 mPa·s at 130 °C per ASTM D3236-15; the 43 g/10 min melt index permits this without solvent. Peel adhesion on stainless steel evaluated by PSTC-101 typically ranges 4–10 N/25 mm; loop tack is assessed by FINAT FTM 1; static shear is assessed by FINAT FTM 8 at 1 kg, 23 °C, 50% RH. Indirect food label applications fall under FDA 21 CFR 175.105; EU Regulation 10/2011 applies only if the adhesive becomes a plastic layer in final contact, which is not the case for most paper labels. Terminal products include barcode labels, logistics labels, and double-coated transfer tapes used on recyclable corrugated boxes. The limitation is thermal resistance: unmodified EVA hot-melt pressure-sensitive systems generally show shear adhesion failure below 70 °C; high-temperature label stocks require acrylic or rubber solution systems.
| Downstream segment | EVA addition range | Tackifier loading | Application temperature | Reference standard |
|---|---|---|---|---|
| Corrugated case sealing | 28–35 wt% | 35–45 wt% | 160–175 °C | FDA 21 CFR 175.105 |
| Perfect binding | 30–38 wt% | 35–45 wt% | 150–170 °C | ISO 11339:2022 |
| Pressure-sensitive label coating | 18–25 wt% | 45–55 wt% | 120–150 °C | PSTC-101 |
| Edgebanding | 30–42 wt% | 25–40 wt% | 180–200 °C | EN 204:2016 D2 |
| Automotive interior lamination | 25–35 wt% | 30–40 wt% | 150–170 °C | VDA 278:2011 |
| Foam-to-fabric lamination | 25–38 wt% | 35–45 wt% | 130–160 °C | ISO 11339:2022 |
When converting low-energy edging tapes on high-speed edgebanding machines with dual-mode EVA/PUR capability, this 28% VA, 43 MI grade is used in filled hot-melt edge adhesives at resin loadings of 30–42 wt%, rosin-modified hydrocarbon tackifier at 25–40 wt%, paraffin wax at 3–10 wt%, and 10–20 wt% calcium carbonate filler. Filler levels above 20 wt% increase viscosity and reduce wetting on low-energy edging tapes below 38 mN/m. Application takes place from a heated reservoir at 180–200 °C through a roller or slot applicator directly onto 1–3 mm ABS, PVC, melamine, or veneer banding; pressure rollers immediately follow at 0.2–0.5 MPa and line speeds range from 15 to 80 m/min depending on panel geometry. The heated reservoir must maintain ±3 °C temperature control to avoid char formation at the roller applicator. Compliance for interior furniture adhesives is often referenced to EN 204:2016 durability class D2 for thermoplastic wood adhesives; finished panel emission requirements are governed by EN 13986:2004 + A1:2015, not by the adhesive alone, but low-VOC formulations are required for indoor use. REACH (EC) No 1907/2006 applies to monomer and plasticizer residues. Finished articles comprise kitchen cabinet doors, office desktops, wardrobe side panels, and store fixture panels. On dark laminate panels with surface temperature above 70 °C under direct sunlight, a 28% VA EVA edge adhesive may show heat-fail below 80 °C unless blended with lower-VA or maleated polyolefin grades; published data for this specific 43 MI grade in filled high-heat edgebanding adhesives is limited, so converters should validate on their actual banding stock before production release.
Automotive interior trim lamination with hot-melt web or swirl spray application uses Ateva 2825A at 25–35 wt% in a formulation containing 30–40 wt% hydrogenated C9 tackifier, 5–15 wt% paraffinic plasticizer, and 0.5–1.0 wt% hindered phenolic/phosphite antioxidant. Melt is sprayed at 150–170 °C with a 0.2–0.6 mm swirl nozzle onto polyurethane foam or nonwoven backing, then nipped to ABS, PC/ABS, or polyolefin substrate at 0.05–0.2 MPa within 5–30 s. The high VA content improves polar adhesion to ABS and PVC, but the processing ceiling is 190 °C; above this, vinyl acetate thermal elimination liberates acetic acid and raises odor. Fogging is measured by VDA 278:2011 thermodesorption, with condensable fractions typically required below 250 μg/g for OEM approvals; odor is assessed per VDA 270:2018, often with a target ≤3 for interior applications. REACH (EC) No 1907/2006 and the EU End-of-Life Vehicles Directive 2000/53/EC restrict certain plasticizer and heavy metal residues. Terminal parts include door panel insert laminates, A- and B-pillar cover fabrics, and acoustic underlayment composites. A production-scale failure mode observed on laminating lines is hot-melt stringing at high line speed when melt viscosity falls below 1,000 mPa·s at 160 °C; adding 2–5 wt% wax to increase viscosity must be balanced against fogging risk.
Foam-to-fabric lamination for mattress ticking, upholstery panels, and acoustic panel facing applies this 28% VA resin at an addition of 25–38 wt% with 35–45 wt% hydrocarbon/rosin ester tackifier, 10–20 wt% naphthenic oil, and 0.3–0.8 wt% antioxidant. The adhesive is applied by roll coater or slot die at 130–160 °C to polyurethane foam at 15–50 g/m², then immediately nipped to polyester, cotton, or olefin textile at 0.1–0.4 MPa line pressure and 10–60 m/min line speed. Automatic coat weight control is maintained by positive displacement gear pumps with ±2% flow variance. The 43 g/10 min melt index enables single-pass kiss coating without foam burn-through; the 28% VA content increases plasticizer migration resistance relative to EVA grades below 18% VA. Aged peel adhesion is assessed by ISO 11339:2022 after conditioning at 45 °C and 80% RH for 14 days; minimum values are often specified by contract laminators at 2.0 N/cm. Compliance requirements depend on end use: REACH (EC) No 1907/2006 Annex XVII applies, and for upholstered seating sold in North America, composite foam/textile samples may be tested to CAL TB 117-2013 for smolder resistance, with the adhesive layer not contributing to open-flame propagation. Terminal finished products include innerspring mattress foam covers, removable upholstery panels, and auditorium seat back laminates. The operational boundary is that coat weights above 50 g/m² on low-density polyurethane foam below 20 kg/m³ can cause adhesive strike-through and stiff hand; pre-trials at 130 °C with a 0.4 mm slot gap are required when substituting from a lower-MI EVA grade.
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Ateva 2825A is specified as an ethylene-vinyl acetate copolymer resin with a vinyl acetate comonomer content of 28% by weight and a melt flow rate of 43 g/10 min determined under ASTM D1238 or ISO 1133-1:2022 at 190°C/2.16 kg. The grade is supplied in pellet form for formulation into thermoplastic hot-melt adhesives, where comonomer content governs polarity, crystallinity, low-temperature flexibility, and compatibility with tackifying resins. Vinyl acetate content is normally verified by FTIR spectroscopy using ASTM D5594 or ISO 8985. Density, where reported, is determined by ASTM D1505 or ISO 1183-1; thermal transitions are evaluated by differential scanning calorimetry under ISO 11357-3 or ASTM D3418. Standard adhesive evaluations include peel adhesion under ASTM D1876, loop tack under ASTM D6195 or PSTC-16, and shear adhesion failure temperature under ASTM D4498. These designations provide comparative data only when substrate, coating weight, thermal history, and additive package remain fixed.
| Property | Test method | Specification or basis |
|---|---|---|
| Vinyl acetate content | ASTM D5594, ISO 8985 | 28% by weight |
| Melt flow rate | ASTM D1238, ISO 1133-1:2022 | 43 g/10 min at 190°C/2.16 kg |
| Density | ASTM D1505, ISO 1183-1 | Supplier datasheet value |
| Melting and crystallization behavior | ISO 11357-3, ASTM D3418 | Broad endotherm typical of 28% VA EVA |
At 28% vinyl acetate by weight, the molar comonomer content is approximately 11 mol%. This level of random comonomer insertion disrupts polyethylene crystallinity sufficiently to suppress the sharp melting point and lower the glass transition temperature relative to low-density polyethylene, while residual ethylene sequences continue to contribute green strength and strain hardening. The resulting morphology broadens the melting endotherm observed under ISO 11357-3 and reduces the brittle-fracture tendency at low temperatures. These structural features are directly relevant to freezer-grade packaging and cold-climate assembly where bond deformation should occur without crack propagation.
At 28% vinyl acetate, random comonomer insertion increases overall polarity and reduces crystallite size. Shore hardness and tensile modulus are lower than values obtained from an 18% VA grade at equivalent melt flow rate, while elongation and low-temperature flexibility are higher. Adhesion to polar substrates such as clay-coated paperboard, aluminum foil, hardwood, and corona-treated polyolefins is improved by dipolar interactions and improved molten substrate wetting. Peel adhesion measured under ASTM D1876 on low-energy substrates may show higher values relative to an 18% VA copolymer at equivalent coating weight, but the result is substrate-specific and cannot be predicted from the resin specification alone. Low-temperature bond performance should be verified by lap shear testing under ASTM D4501 or ISO 4587 using the production substrate and coating weight; published data for this specific configuration is limited.
The higher polarity of a 28% VA copolymer shifts its solubility parameter closer to rosin ester and hydrogenated rosin tackifiers, reducing haze and improving room-temperature tack relative to nonpolar polyethylene-rich grades. On untreated polyolefin surfaces, however, even a polar EVA melt may wet incompletely; corona or plasma pretreatment is commonly specified to raise substrate surface energy to the level required by the substrate and measured under ASTM D2578. In high-speed packaging and bookbinding formulations, open time and set speed are adjusted primarily through tackifier type, wax type, and loading level, with the base resin VA content fixing the polarity and cohesion envelope.
Melt flow rate is an inverse flow indicator, not a direct viscosity measurement. A value of 43 g/10 min under ASTM D1238 conditions of 190°C/2.16 kg indicates relatively low molten viscosity compared with hot-melt EVA grades in the 6–25 g/10 min range. Capillary rheometry under ASTM D3835 is required to generate shear viscosity curves across the shear-rate range of 10² s⁻¹ to 10⁴ s⁻¹ encountered in roll coaters, slot-die coaters, and spiral spray applicators. The 43 MI specification reduces backpressure in heated transfer lines and promotes rapid substrate wetting and penetration into porous materials such as corrugated board and nonwoven webs. Lower melt viscosity also reduces melt strength and may increase stringing, misting, or splatter in high-speed fiberized spray application unless the formulation is modified with suitable wax or viscosity control additives. Equipment parameters such as heated hose temperature, gear pump speed, and die gap must be matched to the low-viscosity profile; published data for this specific production configuration is limited.
On a high-speed adhesive coating line, the 43 g/10 min melt flow rate allows a lower application temperature to be employed compared with a 25 g/10 min grade of equivalent VA content, while maintaining a workable viscosity for transfer and metering. Hot-melt processing temperatures for EVA-based adhesives generally range from 150°C to 180°C; within this range, the molten resin can be delivered through heated hoses and gear pumps with reduced thermal stress and lower energy input. In slot-die coating configurations, the lower viscosity improves melt leveling and reduces the pressure required to pump material through the die manifold, permitting thinner adhesive films at elevated line speeds. In spiral spray and fiberized spray systems, atomization depends on the balance among viscosity, surface tension, and air temperature; low-viscosity resins can produce finer droplets but may narrow the application window for avoiding overspray and misting. Production equipment should include thermocouple-controlled melt tanks, continuous circulation loops, and inert gas blanketing to minimize residence time at the upper end of the processing range and to limit char formation in dead zones.
Two EVA resins with identical 43 MI values can differ in high-shear viscosity because melt index does not capture full molecular weight distribution or long-chain branching. Compounding with wax and tackifier further modifies shear-thinning behavior. For this reason, the 43 MI value is a specification control point rather than a complete rheological profile; capillary rheometry under ASTM D3835 and dynamic mechanical analysis under ASTM D4440 or ISO 6721-1 are required for equipment sizing and for predicting nozzle pressure drops.
Ethylene-vinyl acetate copolymers degrade thermally through deacetylation, a reaction that liberates acetic acid and generates unsaturation in the polymer backbone when the melt is held at elevated temperature for extended periods. The rate accelerates significantly above 180°C in air; molten reservoirs held above this temperature risk viscosity drift, darkening, and corrosion of downstream metal components. Ventilation is required to remove acetic acid vapor from melt tanks and coating heads. Nitrogen blanketing reduces oxidative degradation but does not stop deacetylation. Pre-drying is generally not required for pelletized EVA hot-melt grades stored under dry conditions; however, surface condensation or storage above 60% relative humidity may introduce sufficient water to cause foaming or hydrolysis during melting. If drying is necessary, a desiccant dryer at 60°C to 70°C for 3 h to 4 h is preferred, with the temperature kept safely below the pellet softening point to prevent agglomeration. Wetted surfaces containing copper alloys should be avoided because acetic acid released during degradation can corrode these materials; austenitic stainless steel or nickel-alloy construction is preferred for extended service life.
Residence-time control is more important for a 28% VA grade than for an 18% VA grade because vinyl acetate units participate in deacetylation. Molten adhesive should be processed on first-in-first-out circulation rather than in dead-leg batch tanks where older material can remain at temperature and form char. If the melt viscosity drifts beyond the specification range or the color shifts from water-white to amber during a production shift, thermal degradation has progressed and the system should be drained. Heat-stability screening under ASTM D4499 is used to compare formulations and to monitor viscosity stability, skinning, and color change under controlled conditions.
In case and carton sealing, the 43 MI resin is formulated for wheel, slot-die, or extrusion application, forming compression bonds on corrugated board. The low melt viscosity supports rapid penetration into linerboard fibers before wax crystallization and polymer solidification produce the initial set. In bookbinding, the resin contributes to spine flexibility and page pull strength; adhesive formulations based on 28% VA EVA are processed in heated tanks and applied through nipped rollers, with performance judged by page pull and flex testing rather than tensile testing alone. In product assembly and filter bonding, the 43 g/10 min melt flow enables wetting of metal, plastic, and treated substrates at lower application temperatures, reducing thermal distortion of heat-sensitive components. Published data for this specific configuration is limited; end-use qualification under the relevant assembly and aging protocols is required before production release.
The selection of Ateva 2825A over a lower VA grade is driven primarily by adhesion and low-temperature flexibility. An 18% VA EVA at the same melt flow rate generally exhibits higher crystallinity, higher Shore hardness, higher tensile modulus, and greater resistance to nonpolar oils, but lower peel adhesion on polar surfaces and less tack. A further increase to 33% VA or higher may enhance adhesion to difficult substrates and reduce application temperature, but it typically reduces cohesive strength, heat resistance, and creep resistance at elevated service temperatures. The 28% VA level is therefore positioned as an intermediate balance for general packaging, bookbinding, and product-assembly adhesives requiring both hot tack and final bond strength.
The 43 MI specification differentiates the product from a lower melt index EVA of equivalent VA content, which would provide higher melt viscosity, longer open time, higher melt strength, and generally higher shear adhesion failure temperature, but at the cost of slower wetting and higher processing pressures. Conversely, a 150 MI or higher EVA grade may be used for low-temperature application but may produce adhesives with reduced shear resistance and higher cold flow. Melt index alone cannot predict shear thinning or viscous heating under production-scale shear rates; capillary rheometry under ASTM D3835 and dynamic mechanical analysis under ASTM D4440 or ISO 6721-1 are required for robust grade comparison.
Formulations based on Ateva 2825A are mixed with tackifiers and waxes at loadings dictated by open time, set speed, and adhesion requirements. Phase separation can occur when aliphatic-rich tackifiers with low polar contribution are used at high addition levels; this limitation appears as surface haze, reduced tack, and peel adhesion loss after aging. Heat-stability trials conducted under ASTM D4499 are used to monitor viscosity drift, color change, and surface skinning. Additive packages that rely on basic amine chemistry are generally avoided because acidic degradation products from EVA may interact with these additives to form salt residues that can plate out on coater dies. No single additive formulation should be inferred from the resin specification alone; all hot-melt formulations require end-use qualification.
