| HS Code | 642297 |
| Vinylacetatecontent | 28% |
| Meltindex | 2.0 g/10 min (190°C/2.16 kg) |
| Density | 0.951 g/cm³ |
| Tensilestrengthatbreak | 13.8 MPa |
| Elongationatbreak | 700% |
| Flexuralmodulus | 20 MPa |
| Hardnessshored | 35 |
| Meltingpoint | 75°C |
| Vicatsofteningpoint | 45°C |
| Brittlenesstemperature | -110°C |
As an accredited ELVAX 250 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 250 ethylene vinyl acetate copolymer is supplied as free-flowing pellets in 25 kg multi-layer paper bags. |
| Container Loading (20′ FCL) | ELVAX 250 is loaded as a 20-foot full container load, ensuring safe, efficient transport of ethylene vinyl acetate copolymer. |
| Shipping | ELVAX 250 is typically shipped as solid pellets in multi-layer paper bags or FIBC bulk sacks. It is non-hazardous, but avoid high temperatures, prolonged sunlight, and moisture during transit. Keep containers sealed, dry, and well-ventilated to prevent clumping or degradation. Standard dry-cargo transport is suitable. |
| Storage | Store ELVAX 250 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed to prevent moisture pickup and contamination. Avoid dust accumulation and store away from strong oxidizers. Use proper labeling and maintain good housekeeping practices. |
| Shelf Life | Shelf life is indefinite when stored cool, dry, and protected from UV; avoid heat and humidity. |
For medium-speed case and carton sealing lines operating at 40–70 m/min, ELVAX 250 is melt-compounded at 28 wt% vinyl acetate with a melt index of 25 g/10 min under ASTM D1238 (190°C, 2.16 kg). The high melt index reduces mixer torque in 200–500 L sigma-blade mixers and permits lower melt temperatures of 150–170°C when paired with rosin ester tackifiers having softening points between 85°C and 105°C. Packaging-grade formulations are composed of 30–40 wt% ELVAX 250, 30–40 wt% rosin ester or aliphatic hydrocarbon tackifier, 20–30 wt% paraffin or Fischer-Tropsch wax, and 0.5–1.0 wt% hindered phenolic antioxidant. Compounding is completed at a final batch temperature of 170–180°C under nitrogen blanketing; excursions above 200°C for more than 30 min produce a measurable rise in acid number and oxidative gel formation. The adhesive is applied from heated piston-pump systems at 160–180°C, with nozzle-to-substrate open time adjusted by wax volume fraction rather than by EVA grade alone. Adhesion to clay-coated and OCC corrugated board is evaluated with ASTM D1876 T-peel geometry after 24 h conditioning at 23°C and 50% RH. Food-contact carton closure falls under FDA 21 CFR 175.105 when the adhesive is separated from food by a functional barrier; the polymer itself is listed under FDA 21 CFR 177.1350 for EVA copolymers in contact with food. EU converters may additionally verify specific migration limits under Regulation (EU) No 10/2011 and REACH SVHC content under Regulation (EC) No 1907/2006. Operational boundary: ELVAX 250 is not suitable for freezer-grade case sealing in direct contact with high-fat food unless the formulation is blended with a higher-molecular-weight EVA or metallocene polyolefin to maintain low-temperature fiber tear below -18°C.
| Regulatory/technical scope | Standard or code | Application-specific condition |
|---|---|---|
| EVA copolymer in food-contact articles | FDA 21 CFR 177.1350 | Base resin with 28 wt% vinyl acetate |
| Adhesives used as indirect food additives | FDA 21 CFR 175.105 | Functional barrier required in folding cartons |
| Paper and paperboard coatings | FDA 21 CFR 176.170 | Wax-modified corrugated food packaging |
| EU plastics food-contact regulation | Regulation (EU) No 10/2011 | Overall migration and SML verification |
| REACH registration | Regulation (EC) No 1907/2006 | SVHC content disclosure |
| Melt mass-flow rate | ASTM D1238 / ISO 1133-1:2022 | 190°C / 2.16 kg |
Addition of 2–8 wt% ELVAX 250 to a 52–58°C melting paraffin or Fischer-Tropsch base raises low-temperature flex crack resistance and reduces moisture-vapour transmission rate in heavy-duty corrugated boxes. The melt blend is prepared in a heated stainless steel tank at 120–135°C using a high-shear disperser at 1,000–1,500 rpm until a clear single-phase melt is obtained; holding above 150°C for more than 4 h accelerates thermal oxidation of the paraffin and darkens the coating. The modified wax is applied by roll coater or curtain coater at 0.5–2.0 mil dry film thickness. At addition levels above 10 wt%, melt viscosity increases sufficiently to impair curtain stability at the die gap, and low-temperature brittleness can return if the crystallizable wax network is excessively disrupted. This is a critical process boundary, not a formulation limit. Moisture-vapour transmission rate is measured according to TAPPI T464 or ASTM D3833; coating weight is confirmed by solvent extraction or direct gravimetric difference. End uses include waxed produce trays, cold-chain poultry boxes, and water-resistant industrial packaging.
ELVAX 250 is dissolved in ethyl acetate/methyl ethyl ketone or toluene/MEK blends at 30–40 wt% solids for dry-lamination of paper/foil and paper/PET structures. The 28 wt% vinyl acetate content improves solubility and reduces solution cloud point in aromatic-free blends compared with 18 wt% VA copolymers. Mixing is performed in flameproof stainless steel vessels with variable-speed turbine agitators; dissolution time at 40–50°C ranges from 3 h to 6 h depending on pellet geometry and solvent ratio. The adhesive is applied on gravure cylinders at 1.5–3.0 g/m² dry coat weight, then dried through three-zone ovens with zone set points of 70°C, 90°C, and 105°C to reduce retained solvent below 10 mg/m². Solvent-borne lines require LEL monitoring because ethyl acetate lower explosion limit is approximately 2.0 vol%; nitrogen-inerted drying and catalytic oxidation of exhaust solvent are standard. Final flexible packaging laminates are evaluated by ASTM D1876 T-peel after curing for 7 days at 23°C. This grade is not selected for retort or boil-in-bag structures because the unbranched EVA backbone lacks sufficient high-temperature shear strength; published data for this specific configuration is limited.
Because 28 wt% vinyl acetate depresses crystalline melting below 75°C, ELVAX 250 can be compounded into chemically blown, peroxide-crosslinked foam formulations for footwear midsoles, sports mats, and gasket strip. Typical foam compounds contain 100 phr ELVAX 250, 0.8–1.2 phr dicumyl peroxide, 2.5–4.5 phr azodicarbonamide, 0.5–1.0 phr zinc oxide or zinc stearate as activator, and 2–8 phr calcium carbonate nucleating filler. Mixing is conducted on a two-roll mill at 85–95°C to prevent premature decomposition of the azodicarbonamide blowing agent, whose decomposition onset is approximately 190–205°C and must be preceded by peroxide crosslinking at 160–175°C. The milled sheet is pre-formed and compression molded at 160–170°C under 10–15 MPa for 8–15 min depending on part thickness. The process conflict is narrow: if mold temperature reaches 180°C too rapidly, gas evolution occurs before the peroxide has built a sufficient gel network, causing cell coalescence and density fluctuation. Foam density is controlled between 0.12 g/cm³ and 0.30 g/cm³ by adjusting ADC dosage and mold fill ratio. Cell structure is checked by optical microscopy against internal pore-size distribution limits; tensile properties are measured according to ISO 1798, and compression set according to ISO 1856. Footwear midsole compounds require a 50% compression set below 35% after 24 h at 23°C; if this is not met, the grade is blended with 10–20 phr EVA having higher VA content or lower melt index to raise crosslink density. Published data for ELVAX 250 alone in midsole formulations is limited.
ELVAX 250 is let down at 50–70 wt% filler or pigment loading in polyolefin masterbatch production when the 25 g/10 min melt index permits wetting without excessive torque. The carrier is fed into a co-rotating twin-screw extruder with 40:1 L/D, side feeder at barrel 7, and temperature profile of 90–95°C in the feed zone, 100–120°C in the mixing zone, and 130–140°C at the die. The low processing temperature protects organic red and yellow pigments from heat history above 140°C. Dispersion quality is measured by filter pressure value according to EN 13900-5 and by optical microscopy on extruded film samples. The masterbatch is diluted in LDPE or LLDPE at 2–4 wt% for thin-wall injection molded closures and film. Operational boundary: the polar vinyl acetate group restricts use in high-density polyethylene pipe grades; carrier addition is kept below 8 wt% of the final compound to preserve tensile yield strength according to ASTM D638. Published data for this specific configuration is limited.
Roofing-membrane and pavement-binder producers incorporate 3–6 wt% ELVAX 250 into 70/100 penetration-grade bitumen using a high-shear Silverson mixer at 3,000–5,000 rpm and 175–185°C for 90–120 min. The EVA phase is dispersed as 2–10 µm droplets; storage stability is assessed by the difference in ring-and-ball softening point between top and bottom thirds after 72 h at 180°C according to EN 13399. Proper dispersion limits the top/bottom softening point difference to below 2°C; above this threshold the formulation requires sulfur or reactive compatibilizer. Low-temperature flexibility is measured by cold flex temperature according to EN 1109, with EVA addition shifting the limiting flexibility temperature downward compared to straight-run bitumen. End products include polymer-modified bitumen waterproofing membranes, torch-applied roofing sheets, and heavy-duty pavement binders. Limitation: continuous storage above 190°C degrades the ethylene sequences by chain scission; storage tanks must be purged with nitrogen and temperature controlled below 190°C to limit viscosity drift. This grade is not used in emulsions without prior pH adjustment because the high VA content increases acid sensitivity in cationic emulsion systems.
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DuPont ELVAX 250 is an ethylene-vinyl acetate copolymer resin supplied as pellets with a nominal vinyl acetate comonomer content of 28 wt% and a melt flow rate of 25 g/10 min when measured under ASTM D1238 at 190 °C and 2.16 kg load. The combination of moderate vinyl acetate content and high melt index places the material in the high-flow segment of the ELVAX range. It is used primarily in hot-melt adhesives, solvent-based coatings, wax modification, and thermoplastic compounding where low melt viscosity and polar substrate wetting are required. Typical published density is 0.951 g/cm³ under ASTM D1505. Because the product is a copolymer rather than a compounded system, its final performance depends heavily on formulation ratios with tackifiers, waxes, plasticizers, and stabilizers.
| Property | Test method | Typical value |
|---|---|---|
| Vinyl acetate content | Manufacturer method | 28 wt% |
| Melt flow rate | ASTM D1238, 190 °C, 2.16 kg | 25 g/10 min |
| Density | ASTM D1505 | 0.951 g/cm³ |
| Shore A hardness | ASTM D2240 | 68 |
| Tensile strength at break | ASTM D638 | ≈5.2 MPa |
| Elongation at break | ASTM D638 | ≈790 % |
In hot-melt adhesive compounding, open time and set speed are not controlled by the polymer alone; they emerge from the melt rheology of the EVA phase, the compatibility limit of the tackifier, and the crystallization rate of the wax diluent. ELVAX 250, with a melt flow rate of 25 g/10 min, produces a relatively fluid EVA phase at application temperatures. On packaging lines, adhesive reservoirs are typically maintained between 150 °C and 180 °C. At the upper end of that range, the absence of nitrogen blanketing can accelerate oxidative gel formation in dead zones such as gear-pump bypass loops and slot-die edges. Gel bodies formed under these conditions can plug screen packs and produce char particles on board stock, a failure mode that is mitigated by reducing hold time and selecting antioxidant loadings matched to the total formulation rather than to the neat resin.
Formulation ranges for corrugated and carton-sealing adhesives commonly include 30–40 wt% ELVAX 250, 30–45 wt% rosin ester or hydrogenated hydrocarbon tackifier, 20–30 wt% paraffin or Fischer-Tropsch wax, and 0.5–1.0 wt% hindered phenol antioxidant. The high vinyl acetate content of 28 wt% provides polar interaction with paper, board, and aluminum foil, while the high melt index reduces the energy required for wet-out on low-surface-energy films. Open time in such systems is usually adjusted by changing the wax melting range and the tackifier softening point rather than by altering the EVA grade alone. For structural evaluation, peel adhesion is typically screened under ASTM D1876, and hot shear resistance can be screened under ASTM D4498; published data for specific ELVAX 250 formulations is limited, so application-specific testing remains necessary.
In wax-blend applications, ELVAX 250 is added to paraffin and microcrystalline waxes at loadings of 5–30 wt% to raise melt viscosity, reduce brittleness, and improve adhesion to paper and board. The effect is more pronounced with 28 wt% vinyl acetate than with lower-VA grades because the polar acetate groups disrupt wax crystal networks and increase cohesive strength. Compounding is usually performed in heated low-shear mixers at 130–150 °C until visual homogeneity is achieved. Batch-to-batch variation in wax melting range can shift the required mixing time, and excessive temperature can cause phase separation if the tackifier is insufficiently compatible.
Solvent-borne adhesives based on ELVAX 250 are prepared by dissolving the resin in aromatic or chlorinated solvents such as toluene, xylene, or methylene chloride. Ketone and ester solvents may also be used at lower solids loadings. The resin is not fully soluble in alcohol or aliphatic hydrocarbon carriers, which limits the use of purely aliphatic diluents in low-VOC formulations. Solution viscosity at equal solids is lower than that of an EVA grade with a melt flow rate below 10 g/10 min because the lower molecular weight of ELVAX 250 reduces chain entanglement. Typical coating solids for roll-applied adhesives range from 20 wt% to 40 wt%, depending on the solvent blend and the required wet film thickness.
Coating lines using reverse roll, wire-wound rod, or slot-die application usually dry EVA films at 80–120 °C. Residual solvent retained in the film depresses the heat-seal initiation temperature and can cause blocking in stacked finished goods. The manufacturer’s handling guidance recommends forced-air drying with sufficient exhaust volume to maintain the solvent concentration below the lower explosive limit. Because the 28 wt% vinyl acetate content increases solubility in polar solvents compared with lower-VA EVA grades, ELVAX 250 can be incorporated into solvent-based inks and coatings where conventional low-polarity polyolefins require aromatic solvent systems. Published data for solvent retention as a function of coating speed and film thickness in ELVAX 250 systems is limited; line-specific drying studies are normally required.
When a formulator moves from a lower melt index EVA resin to ELVAX 250, the primary trade-off is a reduction in melt viscosity and an increase in flow-related substrate wetting, offset by lower cohesive strength and reduced high-temperature shear resistance. Compared with an EVA resin of similar vinyl acetate content but a melt flow rate below 10 g/10 min, ELVAX 250 produces lower extruder torque and faster injection or metering cycles, but tensile strength at break and heat resistance decline. Conversely, compared with a 20 wt% vinyl acetate resin of similar melt index, ELVAX 250 gives higher adhesion to polar surfaces and greater low-temperature flexibility, while exhibiting lower Shore hardness and higher gas and moisture permeability.
The selection is therefore governed by the dominant failure mode on the production line. Where bond formation speed is controlled by wet-out at high line speed, the high flow of ELVAX 250 is advantageous. Where the finished adhesive must maintain shear strength at 50 °C or above, a lower melt index grade or a partially crosslinked system may be required. The material is also used as a viscosity modifier in blends with higher molecular weight EVA grades, added at low percentages to reduce melt pressure in twin-screw compounding without eliminating the cohesive contribution of the high-molecular-weight fraction.
As a polymer modifier, ELVAX 250 is used in olefin masterbatch and cable compounds at loadings of 2–10 wt% to adjust flexural modulus and improve filler wetting. The high melt index allows melt blending in twin-screw extruders with length-to-diameter ratios of 40:1 or higher, and it can assist dispersion of carbon black, mineral fillers, and pigment concentrates. Published data for this specific configuration in ELVAX 250 is limited; processability and dispersion must be validated on the target extrusion line because screw configuration and barrel temperature profile alter the residence-time distribution.
Food-contact status is not intrinsic to the raw resin; compliance must be verified under FDA 21 CFR 177.1350 or analogous regional regulations for the specific formulation and end-use condition. REACH registration is maintained by the manufacturer for the European Union market. The product contains no intentionally added heavy metals and is generally considered suitable for RoHS-restricted electrical and electronic applications, but certification remains the responsibility of the finished-article producer.
