| HS Code | 785757 |
| Resin Name | Ateva 3325A EVA Copolymer Resin |
| Resin Type | Ethylene Vinyl Acetate (EVA) Copolymer |
| Vinyl Acetate Content | 33% |
| Melt Index | 43 g/10 min (190°C/2.16 kg) |
| Density | 0.960 g/cm³ |
| Form | Pellets |
| Melting Point | 62°C |
| Glass Transition Temperature | -35°C |
| Tensile Strength | 7 MPa (typical) |
| Elongation At Break | 800% |
| Shore A Hardness | 70 |
| Brittleness Temperature | -70°C |
As an accredited Ateva 3325A EVA Copolymer Resin,33% 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 | Supplied as translucent EVA pellets in 25 kg multi-wall paper bags, 40 bags per pallet, total quantity 1000 kg. |
| Container Loading (20′ FCL) | 20′ FCL: palletized 25kg bags of Ateva 3325A EVA resin, shrink-wrapped, securely loaded to maximize capacity and prevent damage. |
| Shipping | Ship as non-hazardous EVA copolymer resin in sealed multi-wall paper or polyethylene bags on pallets, or in bulk hopper trucks. Protect from moisture, excessive heat, and direct sunlight. No special transport restrictions apply; keep loads dry and well-ventilated to maintain quality and melt-flow consistency. |
| Storage | Store Ateva 3325A EVA copolymer resin in a cool, dry, well-ventilated area away from direct sunlight, heat, flames, and ignition sources. Keep containers tightly sealed to prevent moisture uptake and contamination. Avoid exposure to temperatures above recommended limits, which could cause blocking or degradation. Maintain clean conditions and proper labeling for safe handling. |
| Shelf Life | Shelf life is typically one year from manufacture when stored unopened in a cool, dry area, protected from moisture and heat. |
Ateva 3325A is an ethylene-vinyl acetate copolymer with 33 wt% vinyl acetate and 43 g/10 min melt index at 190°C/2.16 kg under ISO 1133-1:2022, nominal density approximately 0.96 g/cm³ under ASTM D792-20. The application scenarios below isolate downstream processes in which high vinyl acetate content and high melt flow define the formulation boundary. Where published data for a specific configuration is limited, the operational boundary is stated directly rather than generalized.
| Application area | Reference standard / regulation | Test method or clause | Control condition |
|---|---|---|---|
| Carton sealing for food packaging | FDA 21 CFR 175.105; EC 1935/2004/EC | Indirect food-contact adhesive; overall migration under food simulant | Raw resin alone does not constitute compliance; formulated adhesive must be tested |
| Bookbinding | REACH (EC) No 1907/2006; CLP (EC) No 1272/2008 | Candidate List screening; hazard classification for molten handling | No product-specific global chemical standard exists |
| Automotive interior bonding | VDA 278; DIN 75201-A; REACH Annex XVII | VOC/FOG thermal desorption; fogging reflectance | OEM-specific emission budgets determined by part position and air exchange volume |
| Profile wrapping / edgebanding | REACH (EC) No 1907/2006; RoHS 2011/65/EU Annex II | SVHC screening; restricted heavy metals / brominated flame retardants | Filler loading and tackifier choice affect both compliance and process shear stability |
| Foam-fabric lamination | 16 CFR 1633; California TB 117-2013; REACH Annex XVII | Finished-article flammability; smolder resistance | Adhesive is not sole compliance layer; composite testing required |
Ateva 3325A is compounded at 30–40 wt% with C5 hydrocarbon tackifier resin, paraffin wax, microcrystalline wax and a hindered phenolic antioxidant package for high-speed carton sealing on lines running 40–120 cartons/min. The formulated melt is processed in heated reservoir or drum unloaders at 160–180°C, applied through 0.25–0.50 mm nozzles or multi-dot pattern guns, then compressed for 0.5–2 s until fiber-tearing bonds form on recycled corrugated board at more than 90% fiber tear. Viscosity under ASTM D3236-15 at 177°C is controlled in the 1,000–2,500 mPa·s range; the lower half supports long heated hose runs without exceeding gear pump back-pressure limits, while the upper half reduces penetration through thin linerboard and clay-coated carton board. The 33 wt% vinyl acetate content increases polar wetting of heavily recycled linerboard, and the 43 g/10 min melt index permits rapid filling of star wheel applicators without external plasticizer. Thermal degradation becomes measurable above 190°C as vinyl acetate decomposition releases acetic acid, causing viscosity drift and accelerating corrosion of unprotected aluminum melt reservoirs. Field failures on Nordson ProBlue 10/18 melters are most frequently observed when level sensors allow partially empty tanks with char accumulation on heated side walls. Ateva 3325A lots are controlled for melt-index variation under ISO 1133-1:2022, but pellet-to-pellet vinyl acetate variation still influences tack response on recycled board. If pellets are stored at relative humidity above 60%, pre-drying at 55–65°C for 4–6 h prevents steam foaming in the adhesive bead. For carton sealing destined for dry food packaging, the formulated adhesive must be tested under FDA 21 CFR 175.105 and, where the EU market is involved, under EC 1935/2004/EC; raw resin certification alone is insufficient. Finished goods include regular slotted containers, die-cut trays, wrap-around corrugated cartons and beverage multipack carriers. Exact set speed at line speeds above 80 cartons/min is configuration-dependent because set speed is governed more by wax melting point, nip pressure and board porosity than by the EVA base alone.
At 6,000–12,000 books/h, perfect-binding lines require open-time and cold-flex control that makes Ateva 3325A the base-polymer choice at 35–45 wt%. The typical formula combines the EVA with rosin ester tackifier, Fischer-Tropsch wax and 0.3–0.8 wt% antioxidant; the high vinyl acetate content lowers the glass-transition response of the spine adhesive so that perfect-bound paperbacks do not crack at -10°C when back-flexed after 24 h curing. The glass-transition onset is measurable by ISO 11357-2:2020; high-VA EVA grades of this composition generally exhibit Tg below -20°C. The downstream process starts with spine milling to expose paper fibers, followed by application of a 0.30–0.50 mm adhesive film via glue wheel or nozzle, cover nipping and hydraulic pressing; the adhesive must maintain sufficient open time for cover registration but set before the books enter the trimmer. Melt viscosity under ASTM D3236-15 at 177°C is typically controlled at 2,500–4,500 mPa·s for bookbinding to avoid excessive penetration into uncoated paper stock, which produces strike-through and brittle spines. Ateva 3325A's 43 g/10 min melt index may require viscosity adjustment with wax rather than filler because calcium carbonate at loadings above 10 wt% increases shear-induced char in closed glue pots. Cover-to-spine adhesion is sometimes evaluated by ASTM D6862-11 90-degree peel in in-house specifications, though no universal global standard governs bookbinding adhesives. Compliance is driven by REACH (EC) No 1907/2006 Candidate List screening and CLP (EC) No 1272/2008 classification for hot-melt handling. Finished product types include perfect-bound trade paperbacks, high-volume catalogs, magazines, notebooks and lay-flat book blocks. The operational limit for this grade is not primarily adhesion failure but low-temperature flexibility: below -10°C, formulated systems based on lower vinyl acetate grades show faster spine cracking, while Ateva 3325A retains compliance when the wax level is kept within the formulation window.
Ateva 3325A-based hot-melt formulations used for door panel fabric lamination, headliner edge bonding and filter end-cap construction are processed through slot-die and rotary spray heads at 150–170°C; process suitability is governed less by adhesion than by emission limits. Ateva 3325A is compounded at 15–30 wt% with hydrogenated hydrocarbon tackifiers, low-volatility waxes and 0.5–1.0 wt% antioxidant. The high vinyl acetate content provides adhesion to polypropylene fabric, PET nonwoven, PVC foam sheet and paper filter media without priming, but the resin itself is not a low-emission material. Formulators must verify VDA 278 VOC and FOG values against OEM part-position budgets, because closed interior air exchange volumes in electric vehicles have tightened the operational boundary. Fogging performance is evaluated by DIN 75201-A, with reflectance loss limits set by each automotive OEM rather than by a single global value. On production-scale rotary slot-die coaters at 150–170°C, shear-induced char accumulates on shim plates when the adhesive is held for more than 8 h without nitrogen blanketing; this accumulation changes bead width and causes inconsistent laminate bond strength. Equipment such as heated gear pumps and wide-slot nozzle manifolds require 316 stainless steel wetted surfaces because acetic acid released by EVA thermal degradation can corrode aluminum at the upper end of the processing window. Compliance includes REACH (EC) No 1907/2006 Annex XVII screening, RoHS 2011/65/EU Annex II for heavy metals and brominated flame retardants, and OEM-specific material specifications such as VDA 278; the raw resin cannot be certified without the full formulation because tackifier and wax dominate the volatile residue. Finished product types include door panel trim, headliner edge wraps, instrument panel soft-touch laminations, cabin filter end caps and acoustic insulation layers. Published data for Ateva 3325A in electric vehicle interior adhesives is limited, so emission testing must be conducted on each final formulated melt rather than inferred from neat resin datasheets.
When profile wrapping line speed exceeds 25 m/min, Ateva 3325A at 20–30 wt% allows a 155–165°C application window on PVC and ABS foils over MDF profiles. The formulation for this process includes rosin ester or polar-modified hydrocarbon tackifier at 20–35 wt%, calcium carbonate filler at 10–25 wt% and wax at 5–15 wt%; filler reduces cost and caliper edge build-up but above 25 wt% calcium carbonate the shear viscosity rises enough to increase adhesive pot wear and shorten usable run time before char accumulation. Melts are applied through slot dies or roller coaters at 0.20–0.40 mm coating thickness directly to the foil or profile, followed by wrapping, calibration, pressure rolling and cooling to room temperature. The 33 wt% vinyl acetate in Ateva 3325A improves adhesion to plastisol-laden PVC foils and primed MDF edges compared with lower-VA EVA grades; however, unpigmented rigid PVC foil requires a dedicated polar tackifier or PVC-compatible primer because high-VA EVA alone may not provide sufficient hydrogen bonding to unmodified PVC. Compliance is driven by REACH (EC) No 1907/2006 and RoHS 2011/65/EU Annex II, with additional furniture-specific requirements applied at the finished-article level; no harmonized adhesive-specific standard covers profile wrapping in Europe. Finished product types include edgebanded cabinet doors, profile-wrapped window and door casings, furniture plinths, decorative trim profiles and skirting boards. The operational limit is process speed: above 25 m/min, set speed must be confirmed by low-temperature peel testing because fast cooling can shift the failure mode from cohesive to adhesive when the line runs MDF profiles below 15°C.
Below 140°C, Ateva 3325A-based foam-fabric laminating adhesives develop insufficient wet-out on closed-cell polyurethane foam; above 170°C, the foam substrate begins to degrade. The resin is compounded at 30–40 wt% with hydrocarbon tackifier, microcrystalline wax and antioxidant, then processed by roll coater or controlled-spray systems at 150–170°C. The open time ranges from 3–8 s depending on wax melting point, allowing fusing of low-density polyurethane foam to polyester or polypropylene nonwoven before nip compression. Bond performance is evaluated by ASTM D1876-08 T-peel after 24 h conditioning at 23°C and 50% RH; foam tear rather than adhesive failure is the standard acceptance condition. For mattress and upholstered furniture applications, the finished article must meet 16 CFR 1633 flammability and, for California, TB 117-2013 smolder resistance; the adhesive is not the primary compliance layer but must not promote smolder propagation when positioned between foam and fabric. Compliance testing is therefore performed on the composite laminate, not the adhesive alone. Chemical obligations include REACH (EC) No 1907/2006 Annex XVII and, where relevant, RoHS 2011/65/EU for electrical components in recliner mechanisms if adhesives are applied adjacent to wiring. Finished product types include domestic mattresses, upholstered furniture cushions, automotive seating foam layers, acoustic panels and bedding support laminates. Published data for this specific composition in furniture flame-resistance testing is limited because the adhesive is always tested as part of the full foam-fabric assembly; formulators must not rely on neat resin datasheets for compliance claims.
Competitive Ateva 3325A EVA Copolymer Resin,33% VA,43 MI,Hot Melt Adhesive Grade prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Ateva 3325A is an ethylene-vinyl acetate copolymer resin supplied specifically as a hot melt adhesive grade. The resin carries a nominal vinyl acetate content of 33% by mass and a melt flow index of 43 g/10 min measured at 190°C under a 2.16 kg load in accordance with ISO 1133-1:2022 or ASTM D1238. These two values define the material as a high-VA, high-flow EVA: the vinyl acetate level reduces polyethylene crystallinity and increases polarity, while the melt index indicates low melt viscosity for rapid wetting and application through heated hot melt units. The grade is normally compounded with tackifier resins, waxes, and stabilizers for packaging, bookbinding, and product assembly adhesives. Within the Ateva EVA range, the combination of high VA and high melt flow separates it from lower-VA extrusion grades and from lower-melt-index hot melt grades used when higher cohesive strength or longer open time is required.
The polymer is a random ethylene-vinyl acetate copolymer with CAS registry number 24937-78-8. Its vinyl acetate content is typically verified by Fourier transform infrared spectroscopy per ASTM D5594; melt flow rate is determined by ISO 1133-1:2022 or ASTM D1238; and density is approximately 0.95–0.96 g/cm³ when measured at 23°C by ISO 1183-1:2019 or ASTM D1505. The resin is supplied as pellets and is generally stored in sealed containers away from direct heat and strong oxidizers. Although the polymer is not strongly hygroscopic, surface moisture on pellets can generate steam porosity when the resin is melted above 100°C; if outdoor storage has occurred, warm-air drying below the pellet softening point is used before compounding. Thermal decomposition becomes measurable above 200°C and accelerates above 220°C, releasing acetic acid. Closed hot melt tanks therefore require local exhaust, temperature controllers set below 200°C, and avoidance of long residence time at elevated temperature. The product is generally supplied without the slip and antiblock additive packages used in film-grade EVA; its stabilization approach is selected for melt mixing and hot melt pot life rather than surface finish.
The significance of 33% VA becomes clearer when the copolymer is compared with lower-comonomer grades. At 18% VA, the EVA still retains a substantial crystalline fraction and behaves more like a modified low-density polyethylene, with higher stiffness, higher melting point, and weaker specific adhesion to polar boards. At 33% VA, the resin is amorphous enough to be soft at room temperature, tacky when formulated, and compatible with the resin and wax phases in hot melt adhesives. This composition also reduces heat seal initiation temperature and improves low-temperature impact resistance, but it lowers modulus and increases permeability to non-polar solvents.
At 33% by mass, the copolymer contains approximately 14 mol% vinyl acetate, calculated from the molecular masses of ethylene (28.05 g/mol) and vinyl acetate (86.09 g/mol). At this comonomer level, the average crystallizable ethylene sequence length is short, so the main melting endotherm is broad and shifted well below the melting range of low-density polyethylene. Differential scanning calorimetry according to ISO 11357-3:2018 typically places the peak melting temperature for EVA of this composition between 55°C and 75°C, with a broad shoulder rather than a sharp crystalline transition. The crystalline heat of fusion is correspondingly reduced; published data for this specific Ateva 3325A configuration is limited, and incoming lots should be checked against the supplier certificate of analysis. The acetate side groups increase polarity, which expands compatibility with polar tackifiers and improves wetting of cellulosic and corona-treated surfaces relative to 18% VA EVA. The trade-off is a lower maximum service temperature under load because the crystalline network that resists creep is reduced.
A 43 g/10 min melt flow index corresponds to a low-molecular-weight distribution tail sufficient to reduce melt viscosity at application temperature. In finished hot melt formulations, apparent viscosity is normally measured with a viscometer under ASTM D3236; the resin contributes low viscosity but the final value depends on tackifier and wax dilution. The high flow allows thin adhesive films to wet porous board at low coat weights and reduces pump pressure in gear-pump hot melt systems. The 33% VA level shifts solubility toward rosin ester and aromatic-modified tackifiers; aliphatic hydrocarbon tackifiers may require lower addition levels to avoid phase separation. Compared with 18% or 28% VA EVA, Ateva 3325A generally improves low-temperature adhesion to paper, clay-coated board, and corona-treated polyolefin films, although final peel adhesion must be verified by T-peel testing such as ASTM D1876 on the actual substrate. Heat resistance of the formulated adhesive is evaluated by a shear adhesion failure temperature method such as ASTM D4498, not on the neat EVA, and the high melt index should be expected to reduce SAFT relative to a lower-MI EVA of the same VA content.
In production hot melt equipment, Ateva 3325A is typically processed at 160–180°C through heated reservoirs of 60–300 kg, gear pumps, heated hoses of 6–15 m, and slot-die, roller, or spiral-spray applicators. At these temperatures the resin forms a clear, low-viscosity melt that can be sprayed into fine patterns for case and carton sealing. A 10°C increase between 160°C and 180°C can reduce apparent viscosity enough to alter spray pattern from coarse splatter to fine mist, so closed-loop temperature control is used. Extended residence time above 190°C produces gel formation, color rise, and acetic acid odor in ordinary melt tanks; shifting the set point downward by 5–10°C or adding a hindered phenolic antioxidant may be required. The resin has limited utility in cast film or extrusion coating because its low melt strength and low crystallinity reduce bubble and web stability compared with 25–28% VA film grades.
Gear pumps used with EVA hot melts require inlet pressure control because low melt viscosity can cause cavitation at high pump speeds. On a twin-screw compounding line for hot melt, EVA is often fed downstream after the tackifier and wax are molten, because the resin’s low melting range allows mixing at moderate temperatures. Co-rotating twin-screw extruders with L/D ratios of 40:1 or greater can disperse the resin without excessive shear heating; temperature zones are typically set below 180°C to avoid deacetylation. Single-screw extruders may also be used for hot melt compounding, but high-MI EVA can slip on the barrel wall if the feed throat is not cooled, causing output instability. These processing characteristics are observed on production-scale hot melt lines and are not captured by the melt index value alone.
Hot melt formulations based on Ateva 3325A are commonly built around 25–40 wt% EVA, 30–50 wt% tackifier, 10–30 wt% wax, and 0.1–1.0 wt% antioxidant. These ranges are adjusted by open time, set speed, and heat resistance; high-MI resin is chosen for rapid wetting of difficult boards and thin bond lines at high line speeds. Slot-die coaters running 100–300 m/min may require open times below 1 s; the resin’s low viscosity assists adhesive transfer within the compression nip. However, excessively low viscosity at high temperature can cause starved bonding on porous substrates and increased adhesive penetration into the fibers. Wax selection controls set speed: paraffin wax reduces viscosity and cost, while Fischer-Tropsch wax gives a sharper crystallization and higher heat resistance in the formulated melt. In bookbinding, this resin is used to produce flexible spine adhesives; at high resin loadings the page pull and flex properties are highly dependent on the formulation, and final bind strength should be tested on the actual paper stock rather than predicted from the neat resin.
The glass transition temperature of the neat resin and of the formulated adhesive can be evaluated by dynamic mechanical analysis per ISO 6721-6 or by differential scanning calorimetry. Tackifier resins with high glass transition temperatures raise the adhesive’s storage modulus and heat resistance but may reduce low-temperature flexibility; wax crystallinity shortens set time and increases modulus. Because Ateva 3325A already has a low crystalline fraction, wax and tackifier levels control much of the final mechanical performance. The neat resin’s low modulus is thus not a direct predictor of the adhesive strength; the formulated blend must be tested on the intended substrate.
Choosing Ateva 3325A over a 33% VA grade with a melt index of 10–25 g/10 min changes the adhesive’s cohesive failure mode; the lower-MI analogue generally provides higher tensile creep resistance and higher SAFT but slower wetting and higher application viscosity. Compared with lower-VA EVA, the 33% VA grade provides more polar adhesion and low-temperature flexibility but lower resistance to non-polar oils and heat. Compared with 40% VA EVA, Ateva 3325A typically shows a higher crystallization onset and improved resistance to blocking after coating, although published data for this specific comparison is limited. These differences appear in the formulated adhesive rather than in neat resin tensile values, which is why raw polymer tensile strength per ISO 527-2 or hardness per ISO 868 is not the primary selection criterion for hot melt compounding.
Within a hot melt selection matrix, the choice between Ateva 3325A and another EVA is usually made by comparing vinyl acetate content, melt index, melt viscosity at application temperature, and the resulting SAFT of the finished adhesive. A lower-VA resin such as 28% VA at similar melt flow is less expensive and may give better heat resistance but lower adhesion to polar substrates. A lower-MI resin at 33% VA gives more cohesive strength for heavy cartons or deep-freeze packaging but requires higher processing temperature and may string more at the nozzle. Ateva 3325A occupies the high-flow, high-polarity segment of the EVA hot melt range, which makes it suitable for high-speed case sealing, bookbinding, and general packaging adhesives where low-temperature adhesion and fast wetting are valued over high-load service temperature. The final grade selection should be confirmed with the finished adhesive under the production application method, because tackifier type, wax content, substrate porosity, and line speed can change the performance ranking.
For food packaging, the finished hot melt formulation—not the neat resin alone—must satisfy the applicable regulatory framework. Ethylene-vinyl acetate copolymers may be referenced under FDA 21 CFR 177.1350 when used as articles intended for food contact, subject to extractives limitations; adhesives used in packaging may also be evaluated under FDA 21 CFR 175.105. European users should assess the product under REACH, and electrical or electronic applications may need verification of restricted substance content under RoHS. These regulatory assessments are formulation- and application-dependent and cannot be transferred from the neat resin certificate to the final adhesive without testing.
Ateva 3325A is not recommended for melt processing above 200°C because deacetylation releases acetic acid and may corrode unlined carbon steel equipment. Avoid combining the resin with unneutralized acidic fillers or amine-based additives without compatibility testing; alkaline species can catalyze deacetylation and shorten pot life. In high-humidity environments, surface moisture on pellets can be removed with warm air at temperatures below the pellet softening point, generally not exceeding 60°C, to avoid sintering. These operational boundaries define the practical envelope for this hot melt adhesive resin and distinguish it from higher-viscosity or higher-service-temperature EVA and polyolefin hot melt grades.
