| HS Code | 574474 |
| Vinyl Acetate Content | 33 wt % |
| Melt Flow Rate 190 C 2 16kg | 25 g/10 min |
| Density | 0.96 g/cm³ |
| Melting Point Dsc | 65 °C |
| Vicat Softening Point | 37 °C |
| Glass Transition Temperature | -46 °C |
| Brittleness Temperature | -70 °C |
| Tensile Strength At Break | 11 MPa |
| Elongation At Break | 750 % |
| Shore A Hardness | 82 |
| Flexural Modulus | 30 MPa |
| Brookfield Viscosity 180 C | 1200 mPa·s |
As an accredited ATEVA 3325ACX Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ATEVA 3325ACX Ethylene Vinyl Acetate Copolymer is supplied as free-flowing pellets in 25 kg multi-wall paper bags. |
| Container Loading (20′ FCL) | 20′ FCL container loading of ATEVA 3325ACX EVA copolymer: palletized bags, securely restrained, ventilated, protected from moisture and direct sunlight. |
| Shipping | ATEVA 3325ACX is shipped as solid pellets in moisture-proof bags or sealed containers to prevent clumping. Avoid exposure to high heat, ignition sources, and humidity. Transport in clean, dry, ventilated vehicles, keeping upright and protected from damage. Handle with standard PPE, ensuring proper labeling and segregation from oxidizers per SDS. |
| Storage | Store ATEVA 3325ACX in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep the container tightly closed to prevent moisture absorption and contamination. Avoid heavy stacking to prevent pellet deformation. Under recommended storage conditions, the material should remain stable for at least one year from delivery. |
| Shelf Life | ATEVA 3325ACX has a typical shelf life of 12 months if stored in a dry, cool place away from direct heat and moisture. |
In high-viscosity hot-melt adhesive formulations for edgebanding, profile wrapping, and board assembly, the 33 wt% vinyl acetate content of ATEVA 3325ACX raises polarity and permits wetting of primed PVC, ABS, aluminium, and coated paperboard without a separately added adhesion promoter. The 2.5 g/10 min melt flow rate recorded under ISO 1133-1:2022 at 190 °C/2.16 kg indicates a relatively high molecular weight fraction, which translates into high melt tension and green strength after the compression nip. A starting formulation for application at 160–180 °C contains 28–38 wt% ATEVA 3325ACX, 30–42 wt% fully hydrogenated rosin ester or C5/C9 aliphatic-aromatic resin, 18–28 wt% Fischer-Tropsch wax or a paraffin/microcrystalline wax blend, and 0.3–1.0 wt% hindered-phenolic antioxidant plus 0.1–0.5 wt% phosphite co-stabiliser. The high-vinyl-acetate EVA phase improves compatibility with polar tackifiers and reduces the tendency for wax bloom during thermal cycling, while the low melt index shifts Brookfield viscosity upward; final viscosity is adjusted through wax loading and resin softening point, measured on a Brookfield Thermosel per ASTM D3236 at 180 °C. For edgebanding, a viscosity window of 1,500–3,000 mPa·s is common, whereas lower-viscosity packaging formulations may require 25 wt% or less polymer. Adhesion is quantified by ASTM D1876 T-peel on aluminium and by fibre-tear percentage on corrugated board. Process boundaries are strict: melt tanks are held at 160–180 °C, and exposure above 200 °C for more than 6 h initiates acetic acid elimination, viscosity drift, and char deposition on heater surfaces. Recirculating gear-pump systems with dead-volume-free manifolds are preferred. Where the compounded adhesive is used in food-service packaging, compliance must be verified under FDA 21 CFR 175.105 for indirect food contact and under Regulation EU 10/2011 for overall migration; the neat resin cannot be self-declared without evaluating the finished formulation. Published data for this specific ATEVA grade with maleated rosin tackifiers is limited, so thermal stability at 180 °C, 190 °C, and 200 °C over 24 h should be part of qualification.
Halogen-free flame-retardant cable jacket compounds based on ATEVA 3325ACX are built around the resin’s ability to accept high loadings of aluminium trihydroxide without losing tensile integrity. The 33 wt% vinyl acetate segments lower crystallinity and create polar interaction sites for ATH and magnesium dihydroxide surfaces, but the 2.5 g/10 min melt flow rate demands high-torque mixing and tight thermal control because ATH releases water from about 180 °C. Compounding is performed on a co-rotating twin-screw extruder with L/D 40–48, segmented screws, side stuffing of fillers at the melt seal, and vacuum devolatilisation at a port pressure below −0.08 MPa. A production formulation typically contains 55–70 wt% ATH, 0–15 wt% MDH, 0.5–1.5 wt% vinyltrimethoxysilane or vinyltriethoxysilane coupling agent, 0.2–0.8 wt% internal lubricant, 0.1–0.5 wt% antioxidant/process stabiliser, and 2–5 wt% LLDPE or LLDPE-g-MAH to control elongation and surface roughness. Barrel temperatures are kept at 120–135 °C in the intake zone, 140–155 °C in mixing zones, and 150–165 °C at the die, with melt temperature monitored at the die adapter; exceeding 175 °C for more than a few minutes initiates filler dehydration, surface pitting, and volatile evolution through the vacuum port. Strand pelletising is used with immediate cooling to below 45 °C in a water bath at 15–25 °C. Peroxide-crosslinked jackets require 0.8–1.8 phr dicumyl peroxide, but effective peroxide yield depends on filler surface moisture and adsorbed metal ions; acid groups in the EVA or acidic degradation products quench peroxide radicals and increase scorch. The compound is characterised on an oscillating disc rheometer per ISO 3417 at 170 °C for minimum torque, maximum torque, and ts2 scorch time. Flame spread is graded under IEC 60332-1-2, acid gas generation under IEC 60754-2, and mechanical ageing under IEC 60811-501. Tensile strength above 10 MPa and elongation at break above 150% are common acceptance limits for filled jacket compounds. Grade-specific filler-loading curves are not fully published; plant-scale trials should therefore record screw torque, melt pressure at the screen pack, tensile strength, and elongation at break simultaneously across 55, 60, 65, and 70 wt% ATH levels.
| Standard | Measured property | Typical requirement |
|---|---|---|
| IEC 60332-1-2 | Vertical flame spread on single wire or cable | No propagation beyond specified char height; no flaming drips igniting cotton |
| IEC 60754-2 | pH and conductivity of combustion effluents | pH ≥ 4.3; conductivity ≤ 10 µS/mm |
| IEC 60811-501 | Tensile strength and elongation before and after thermal ageing | Retained elongation generally ≥ 100% of jacket class limit |
| ISO 4589-2 | Limiting oxygen index | Typically ≥ 30% O₂ for flame-resistant HFFR grades |
At the pre-sheet stage, the amorphous-rich morphology of ATEVA 3325ACX sustains gas expansion before the network gel point is reached. The low melt index contributes high elongational viscosity, which resists cell-wall rupture when azodicarbonamide decomposes and forms nitrogen, carbon monoxide, and ammonia. A conventional compound is mixed in an internal mixer or two-roll mill at 100–110 °C with 1.5–4.0 phr azodicarbonamide, 0.5–1.2 phr dicumyl peroxide, 0.5–1.5 phr zinc oxide, 0.5–1.0 phr zinc stearate, and 0–10 phr calcium carbonate. Zinc oxide and zinc stearate lower the effective decomposition onset of ADC from about 205–215 °C toward 155–170 °C, overlapping with the peroxide cure window. The mixed compound is formed into a pre-sheet on a calender or single-screw extruder at 90–105 °C, then expanded in a hydraulic press or continuous double belt press at 160–180 °C under 10–15 MPa initial pressure. Cure time for a 10 mm preform is typically 12–20 min; thick sections above 25 mm require staged heating to avoid a high-density skin caused by premature crosslinking at the surface. Foam density is determined by ISO 845, hardness by ISO 868, and compression set by ISO 1856. Production grades in this class typically fall within 90–250 kg/m³ density and Shore A 30–60 hardness, with an expansion ratio between 4 and 9. The largest process hazard is thermal overshoot above 185 °C; this accelerates surface cure, traps gas below the skin, and produces blow holes or lamination defects. Poor dispersion of dicumyl peroxide creates local gel nodules that appear as hard spots in the expanded sheet. Published data for this specific ATEVA grade under nitrogen-pressurised mat curing is limited; industrial qualification should evaluate gel content by solvent extraction per ASTM D2765, density at 23 °C, and cell size by stereomicroscopy.
Modification of linear low-density polyethylene with 10–30 wt% ATEVA 3325ACX is carried out in a co-rotating twin-screw extruder to produce tough films and puncture-resistant geomembranes. The vinyl acetate comonomer disrupts polyethylene crystallisation, reduces secant modulus, and increases dart impact and slow crack growth resistance. Because the two phases are partially miscible, phase coarsening is limited when the blend is rapidly cooled; slow cooling of thick sections permits co-continuous EVA domains that raise haze and lower tensile yield. Standard characterisation uses secant modulus per ISO 527-2, tear resistance per ISO 6383-2, and dart drop per ASTM D1709/A. At loadings above 20–25 wt% in polypropylene, the same polar-vinyl acetate structure reduces interfacial adhesion and can generate surface transfer to chill rolls; maleated polypropylene at 1–3 wt% is required to stabilise morphology. The low 2.5 g/10 min melt flow rate increases extruder head pressure relative to conventional flexibiliser grades, so screw speed, melt temperature, and breaker plate pressure must be monitored continuously. Published grade-specific toughness data for this exact copolymer in LLDPE-rich blown films is limited, and plant trials should compare film samples at 10, 20, and 30 wt% addition against the base LLDPE on the same line.
At addition levels between 4 and 8 wt%, ATEVA 3325ACX increases softening point and improves low-temperature flexibility in bituminous waterproofing membranes and road crack sealants. The polymer is pre-dried to below 0.05 wt% moisture and added to oxidised or polymer-compatible bitumen at 160–180 °C under high-shear rotor-stator agitation; the low melt index requires either prolonged mixing or pre-masticated pellets to avoid undispersed gel flecks. Softening point is measured by ring-and-ball method per ASTM D36, and penetration by ASTM D5. A 5 wt% addition shifts the softening point upward; the exact magnitude depends on bitumen source and is measured per ASTM D36. The blend is not equivalent to SBS-modified bitumen in dynamic mechanical performance, but it can reduce penetration without the higher cost of styrenic block copolymers. Phase separation occurs if the base bitumen contains high asphaltene content or if mixing is stopped before polymer swelling is complete; storage tanks must maintain circulation and an inert gas blanket below 185 °C. Exposure above 185 °C for more than 24 h initiates EVA chain scission and produces acetic acid, which accelerates corrosion in carbon steel tanks. Published data for this specific ATEVA grade in oxidised-bitumen systems is limited; qualification should include hot storage stability at 180 °C for 72 h and softening-point retention.
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The ethylene-vinyl acetate copolymer grade ATEVA 3325ACX is supplied by Braskem as a high-acetate, low-crystallinity pellet for compounding, hot-melt adhesive, extrusion, and crosslinked foam applications. The grade is specified with a vinyl acetate comonomer content of 33% by weight, a melt flow rate of 2.5 g/10 min at 190 °C/2.16 kg per ASTM D1238 or ISO 1133-1:2022, and a nominal density of 0.957 g/cm³ per ASTM D1505. The 33% VA fraction reduces crystalline melting enthalpy and increases molecular polarity relative to 18% VA ethylene-vinyl acetate copolymers. Those two shifts govern the product’s position in adhesive, sealant, mineral-filled, and flexible-foam applications. The same shifts also define the boundaries: the grade is not a direct substitute for 18% VA materials where high heat resistance is required, nor for 40% VA materials where maximum low-temperature tack is obtained at the expense of cohesive strength. The following sections describe the processing envelope, formulation windows, and comparative data that control use on production equipment.
Thermally induced deacetylation is the primary melt-processing constraint. Sustained melt temperature above 220 °C liberates acetic acid, accelerates yellowness, and can corrode standard low-alloy steel barrels and screws. On corotating twin-screw extruders with 25:1 to 40:1 L/D ratios, barrel set points are commonly maintained between 150 °C and 190 °C, with the die held below 200 °C. Melt residence time in the hot zone should not exceed 10–15 min during line interruption; longer hold times at 190 °C can generate gel-like defects and surface roughness. Screw configurations with low-shear distributive mixing and compression ratios of 2.5:1 to 3.0:1 are preferable to high-intensity kneading blocks, because shear heating above 220 °C accelerates deacetylation. For injection molding, general-purpose screws with 18:1 to 22:1 L/D and injection pressures of 60–80 MPa are adequate for typical flow paths; the required clamp force scales with projected area and gate design rather than melt flow alone.
Capillary rheometry per ASTM D3835 across 10–1,000 s⁻¹ shows a shear-thinning response typical of high-VA copolymers, with a measurable viscosity reduction beginning near 100 s⁻¹. The shear-thinning behavior supports high-output extrusion but can produce melt instability in oversized dies. Die pressure and melt temperature should be monitored simultaneously during scale-up, because pressure transducers placed before the breaker plate detect viscosity changes associated with deacetylation earlier than visual inspection of the extrudate. Vacuum venting with an acid-resistant trap is recommended on long L/D machines, particularly when reclaimed material is introduced or when residence time is variable. The grade should not be blended with polyamide or polyethylene terephthalate without a compatibilizer, because viscosity mismatch and interfacial tension create large-phase domain separation.
Storage and drying define a secondary processing envelope. The grade absorbs less moisture than polyamide or polyester, but surface moisture produces splay in extruded profiles and pinholes in cast films. When pellet storage at relative humidity above 60% is suspected, drying at 60–70 °C for 2–4 h in a desiccant dryer with a dew point below -20 °C is required. Drying above 80 °C should be avoided because pellet surface blocking may occur. In outdoor silos, condensation cycles that introduce free water at the feed throat should be prevented by maintaining constant material flow and by insulating hopper magnets and feed tubes.
In hot-melt adhesive systems, viscosity drift at 180 °C is governed by deacetylation and thermo-oxidative attack on the polyethylene backbone. Brookfield viscosity per ASTM D3236 can be held within ±10% over 8 h when hindered phenolic and phosphite antioxidant packages are used; without stabilization, viscosity may fall from chain scission or rise from crosslinking depending on oxygen availability and mixing configuration. The grade should not be combined with strongly acidic unneutralized rosin tackifiers or metal stearate systems that promote acid-catalyzed degradation. Amine-based additives can react with acetic acid released during processing, consuming stabilizer and forming salts; their use should be evaluated separately rather than assumed compatible. Ring-and-ball softening point per ASTM E28 and open-time measurements on chilled substrates are required to set machine parameters, because 33% VA copolymers show longer open times and lower softening points than 18% VA grades. Shear adhesion failure temperature should be measured per ASTM D4498 when the adhesive is intended for carton-sealing lines with heated conveyor sections.
Hot-melt formulations typically combine 20–40 wt% ATEVA 3325ACX, 30–60 wt% tackifier resin, and 10–30 wt% wax. The 33% VA content broadens compatibility with polar rosin ester and terpene phenolic resins, but excessive tackifier plasticization reduces shear adhesion failure temperature. Melt viscosity at 180 °C generally falls between 500 mPa·s and 5,000 mPa·s depending on wax type and resin ratio. Slot-die coaters, multi-bead applicators, and roll coaters require viscosity control to limit stringing and misting; shear-rate sweeps on a controlled-stress rheometer should be used instead of single-point viscosity when high-shear application heads are used. T-peel adhesion per ASTM D1876 values for 33% VA EVA hot-melts typically fall between 2 N/mm and 8 N/mm depending on substrate, coat weight, and cooling rate. Corona-treated polyolefin and aluminum substrates generally exhibit higher peel values than untreated polyethylene.
In coextruded sealant layers, ATEVA 3325ACX can be used as a sealant resin for flexible packaging. The seal initiation temperature is lower than polyethylene; heat-seal strength per ASTM F88 should be measured because dwell time and sealing pressure affect interfacial interdiffusion. At 33% VA content, a low-molecular-weight tackifier is not always required, but the sealant layer may show blocking at storage temperatures above 35 °C if not compounded with antiblock. Low surface-energy substrates require corona treatment; dyne level should be verified per ASTM D2578. This application benefits from the same melt-temperature limits described for extrusion: die temperature should remain below 200 °C to minimize acetic acid odor in film.
Flame-retardant and low-smoke compounds use ATEVA 3325ACX as a polar matrix for aluminum trihydrate or magnesium hydroxide. Filler loadings up to 65 wt% are feasible on twin-screw equipment, but torque rheometry at 160 °C and 30 rpm shows a sharp viscosity increase when filler surface area exceeds the wetting capacity of the 33% VA matrix. Two-step compounding is preferred for formulations above 60 wt% filler: the polymer is melted first, and filler is introduced via a side-stuffer downstream to reduce screw slippage and improve dispersion. Atmospheric venting is required to remove surface moisture released by aluminum trihydrate. Limiting oxygen index per ASTM D2863 values above 30% are commonly reported for EVA/ATH systems with adequate dispersion; cone calorimeter data per ISO 5660-1 indicate reduced peak heat release rate. Tensile properties should be tested per ASTM D638-14; elongation at break typically decreases below 150% when filler loading surpasses 70 wt%. The compound should not be processed above 190 °C because aluminum trihydrate releases water and the polymer may undergo simultaneous deacetylation. Plate-out on die lips has been observed when stearic acid processing aids exceed 1.0 phr; partially esterified montan wax at 0.3–0.6 phr is a lower-plate-out alternative.
In halogen-free wire and cable compounds, the grade is used with magnesium hydroxide and aluminum trihydrate. Volume resistivity per ASTM D257 and hot-set elongation per IEC 60811-507 are used to screen formulations. The 33% VA content improves low-temperature flexibility compared with 18% VA grades, but compound density and moisture uptake increase with filler loading. Pre-drying of the mineral filler, not only the polymer, is required because aluminum trihydrate can contain up to 0.5% free moisture. The resulting surface moisture is a source of gross voids and reduced dielectric strength if the filler is fed directly without atmospheric venting.
Peroxide-crosslinked foams and footwear midsoles represent a second major conversion route. Dicumyl peroxide levels of 0.8–1.2 phr and azodicarbonamide blowing agent at 2.0–3.0 phr are typical starting points for compression-molded EVA foams. Actual loadings require optimization because residual peroxide creates surface tack and odor. Gel content per ASTM D2765 and compression set per ASTM D395 verify cure state. Mold temperature should be held at the decomposition threshold of the selected peroxide with a tolerance of ±5 °C to prevent premature blowing or incomplete cure. Published data for this specific configuration is limited; pilot-scale trials on the target compression press are required to transfer laboratory gel-content values to production.
Relative to 18% VA ethylene-vinyl acetate grades, ATEVA 3325ACX provides higher molecular polarity, better adhesion to polar substrates, a lower crystalline melting range, and greater filler acceptance. The trade-off is a lower Vicat softening point and reduced tensile strength at room temperature. Relative to metallocene polyethylenes, the grade provides lower processing temperature and improved low-temperature flexibility but lower cohesive strength and lower barrier performance to oxygen and water vapor. These differences should be quantified on the intended processing line rather than inferred from resin data alone.
| Property / attribute | ATEVA 3325ACX (33% VA) | Typical 18% VA EVA | Typical metallocene polyethylene |
|---|---|---|---|
| Polar comonomer content | 33% vinyl acetate | 18% vinyl acetate | 0% vinyl acetate |
| Melt flow rate, 190 °C/2.16 kg (ASTM D1238) | 2.5 g/10 min | 2.5 g/10 min typical | often 1–5 g/10 min depending on grade |
| Nominal density (ASTM D1505) | 0.957 g/cm³ | 0.940 g/cm³ typical | 0.902–0.918 g/cm³ |
| Crystalline melting range | low, broad | medium, more defined | high, narrow |
| Adhesion to polar substrates | high | moderate | low without surface treatment |
| Filler acceptance | high | low to moderate | low |
| Heat resistance | lower | higher | higher |
Numerical differences in heat-seal initiation, shear adhesion failure temperature, and set time require confirmation on the target line because additive packages, tackifier chemistry, and thermal history shift comparative rankings. The polarity and melt viscosity of ATEVA 3325ACX position it between lower-VA EVA grades and high-VA copolymers: adhesion and filler wetting are improved over 18% VA products, while heat resistance and cohesive strength may be lower than metallocene polyolefins at elevated temperatures. Selection should therefore be based on the specific balance of polar adhesion, softness, and thermal resistance measured on production equipment.
Compliance verification for the base resin is performed against the following standard designations.
| Property | Method / standard | Reported value or status |
|---|---|---|
| Melt flow rate | ASTM D1238 / ISO 1133-1:2022 | 2.5 g/10 min at 190 °C/2.16 kg |
| Density | ASTM D1505 | 0.957 g/cm³ |
| Vinyl acetate content | manufacturer specification | 33% by weight |
| Food-contact status | 21 CFR 177.1350 | subject to end-use extraction limits |
| RoHS | Directive 2011/65/EU recast | no intentionally added lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE in base resin |
| REACH | Regulation (EC) No 1907/2006 | polymer exempt from registration; monomer substances registered |
