| HS Code | 957017 |
| Vinyl Acetate Content | 15% |
| Melt Flow Rate | 2.0 g/10 min (190°C/2.16 kg) |
| Density | 0.938 g/cm³ |
| Melting Point | 95 °C |
| Vicat Softening Point | 67 °C |
| Tensile Strength At Break | 20 MPa |
| Elongation At Break | 800% |
| Hardness | 43 Shore D |
| Brittleness Temperature | -90 °C |
| Glass Transition Temperature | -50 °C |
As an accredited HANWHA EVA 2250 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | HANWHA EVA 2250 Ethylene Vinyl Acetate Copolymer is supplied as virgin pellets in 25 kg polyethylene bags, palletized and shrink-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL loads of HANWHA EVA 2250 in bags on pallets, secured, protected from heat/moisture. |
| Shipping | HANWHA EVA 2250 (Ethylene Vinyl Acetate Copolymer) ships as solid pellets in moisture-proof polyethylene-lined bags or bulk containers. Store in a cool, dry area away from direct sunlight and ignition sources. Non-hazardous, but avoid dust accumulation and static discharge. Handle with standard material handling equipment. |
| Storage | Store HANWHA EVA 2250 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep the original container tightly sealed to prevent moisture absorption and contamination. Maintain storage temperatures below 30°C to avoid clumping or degradation. Avoid stacking excessively to prevent deformation. Ensure proper labeling and segregation from incompatible materials. |
| Shelf Life | Shelf life is typically two years when stored in original unopened packaging, away from heat, moisture, and direct sunlight. |
Adhesive compounders using HANWHA EVA 2250 in high-speed case sealing and bookbinding lines typically pre-blend the copolymer with a hydrogenated C9 tackifier and a Fischer-Tropsch wax before the premix enters a jacketed twin-screw or sigma-blade melt mixer operating at 160–180 °C. The nominal 22 wt% vinyl acetate content increases polar interaction with clay-coated recycled board, while the melt flow rate category of 50 g/10 min at 190 °C/2.16 kg under ISO 1133-1:2022 supports thin, repeatable adhesive deposition through heated slot nozzles at line speeds above 180 m/min on rotary carton erectors. Production-scale formulations commonly fall within 30–45 wt% EVA 2250, 30–50 wt% hydrogenated hydrocarbon tackifier, 15–30 wt% synthetic wax, and 0.5–1.5 wt% hindered phenolic antioxidant with phosphate secondary antioxidant. Open time can be extended by replacing a portion of the Fischer-Tropsch wax with a lower melting paraffin wax, but that shift depresses heat resistance of the final bond. The practical ceiling for pot temperature is 200 °C; batch temperature probes on indirect oil-heated melters routinely record a wall-to-bulk differential of 10–15 °C, and sustained operation above the ceiling accelerates deacetylation, increases colour to Gardner values above 5, and produces acetic acid odour at the application head. Recommended pre-drying is 2 h at 45 °C if pouches are opened at ambient relative humidity above 60%. Bond performance is evaluated using ASTM D4499-20 for heat stability, ASTM D1876-08(2015)e1 for T-peel, and ASTM D3236-15 for apparent melt viscosity at 180 °C. On double-flute corrugated board, fibre tear exceeding 85% at peel speeds of 300 mm/min is regarded as acceptable for case sealing, while bookbinding lines require tensile-shear values above 3.5 MPa measured under ASTM D1002-10(2019). Adhesive applicators typically use slot-width shims of 0.2–0.5 mm and maintain pump discharge pressure below 3.5 MPa. A production-scale molten batch usually circulates through a gear pump with a 200-mesh screen pack, and a pressure rise above 2.5 MPa indicates char or gel from thermal degradation, triggering filter replacement. Failure modes observed on manufacturing lines include streaking caused by unmelted pellets when feed rate exceeds the melting capacity of the platen, and viscosity drift when the pot is held at 180 °C for more than 8 h without nitrogen blanketing.
| Test code | Measured parameter | Relevant condition |
|---|---|---|
| ISO 1133-1:2022 | Melt flow rate | 190 °C / 2.16 kg |
| ASTM D4499-20 | Heat stability | 180 °C, 24 h visual and viscosity change |
| ASTM D1876-08(2015)e1 | T-peel adhesion | 300 mm/min, corrugated board |
| ASTM D3236-15 | Apparent melt viscosity | 180 °C, Brookfield Thermosel |
| ASTM D1002-10(2019) | Tensile shear strength | Bonded metal substrate, 1.3 mm/min |
Carbon black masterbatch production uses HANWHA EVA 2250 as a low-viscosity carrier when the compounding line is built around a 40:1 L/D co-rotating twin-screw extruder with side feed at barrel 6 of 10 and an underwater or strand pelletizer. The polar 22 wt% vinyl acetate segments interact with surface-oxidized carbon black aggregates, lowering the specific energy input required for wetting and enabling carbon black loadings of 40–50 wt% without excessive pellet porosity. A standard carrier blend may contain 70–80 wt% EVA 2250, 10–20 wt% low-density polyethylene, and 5–10 wt% calcium stearate or zinc stearate. Masterbatch processors monitor strand die-face temperature at 160–200 °C and keep melt pressure before the screen changer below 12 MPa to prevent die swell and pellet expansion. Specific mechanical energy input on production extruders generally falls between 0.15–0.25 kWh/kg for this class of carrier resin, and side-feeder speed is ramped only after the main feed has reached stable motor torque. Resulting masterbatch pellet is diluted into LDPE or LLDPE blown film at 3–5 wt%; black dispersion is assessed by ISO 18553:2002 and by pressure-rise testing on a 25 μm extruder screen pack. In food-contact applications, the finished article must comply with 21 CFR 177.1350 for ethylene-vinyl acetate copolymers, and the masterbatch supplier must verify overall migration under EU Regulation 10/2011 because carbon black purity is subject to 21 CFR 178.3297. Process limitations include a requirement for inert-gas blanketing on carbon black feed hoppers to reduce ignition risk, and pre-drying of EVA 2250 at 45–55 °C for 1–2 h if pellet surfaces show condensation after storage at relative humidity above 60%. Extruder barrel temperatures above 220 °C initiate measurable acetic acid evolution and surface defects in the diluted film, so melt temperature is normally capped at 200 °C unless the downstream article is not colour-sensitive.
In modified bitumen operations, HANWHA EVA 2250 is introduced at 2–6 wt% into penetration-grade asphalt that has been preheated to 160–170 °C, and the mixture is sheared in a low-speed high-torque horizontal mixer or a colloid mill for 60–120 min under a nitrogen cap. The vinyl acetate segments associate with asphaltene micelles, raising the ring-and-ball softening point from 45–50 °C to 70–90 °C when measured under ASTM D36/D36M, while penetration at 25 °C under ASTM D5/D5M commonly decreases to 25–45 dmm. A torque spike during the first 15 min of mixing is normal on production-scale units as the EVA phase absorbs low-molecular-weight maltenes and swells; operators usually allow a pre-swell at 150 °C for 30 min before applying high shear to avoid the formation of elastomeric gel nuclei that later appear as surface defects in torch-on membranes. The modified binder is then stabilised with 0.3–0.8 wt% organoclay or 0.5–1.5 wt% styrene-butadiene-styrene block copolymer to slow phase separation under EN 13399:2017 storage testing at 180 °C for 72 h. Laboratory data from published bitumen modification studies indicates that EVA addition at 5 wt% increases complex modulus at 60 °C by approximately one order of magnitude while reducing penetration index; however, phase inversion and coalescence are sensitive to polymer melt flow rate, and grades with melt flow rates above 50 g/10 min may require lower storage temperatures and continuous agitation to prevent surface skinning. The cast membrane is produced by saturating a polyester or fibreglass carrier with 3.0–4.5 kg/m² of modified bitumen, and low-temperature flexibility is evaluated by EN 1109:2013 at -20 °C. Elastic recovery under ASTM D6084-21 above 50% at 25 °C is a practical target for water-proofing membranes in moderate climates, though published data for this specific configuration is limited and a plant-scale qualification trial is required before full substitution of a qualified EVA grade.
When a crosslinked EVA foam producer needs to lower compound viscosity for intricate midsole geometries, HANWHA EVA 2250 can be introduced as a minor rheological diluent at 10–20 wt% into a high-molecular-weight EVA base grade with vinyl acetate content of 28–33 wt%, but the change must be evaluated against a measurable loss in parison strength and gas retention. The compounding process blends EVA 2250, azodicarbonamide blowing agent at 3–6 phr, dicumyl peroxide at 0.4–1.0 phr, zinc oxide at 1.5–2.5 phr, and stearic acid at 0.5–1.0 phr on a two-roll mill at 90–110 °C or in a low-temperature internal mixer, with strict temperature control below 110 °C to prevent premature peroxide decomposition. In compression moulding at 150–170 °C and clamping pressure between 15–20 MPa, the foam expands to density ranges of 0.15–0.25 g/cm³ over cycle times of 15–25 min. Process technicians monitor the blowing-ratio pressure drop rather than a fixed cure time because the lower-molecular-weight EVA fraction reduces viscosity and accelerates bubble growth but also weakens the elastomeric network. At 20 wt% EVA 2250, compression set measured under ISO 1856:2018 may increase by 10–20% relative to a non-diluted foam, and tensile strength and elongation under ASTM D3575-14 typically decline to the lower end of the specification range while the cell structure shifts toward larger, less uniform pores. Mould plate flashing and pre-cure scorch are observed when dump temperature exceeds 120 °C, particularly on multi-cavity compression machines with long chamber residence times. Published data for this specific configuration is limited, so trial runs with cavity thermocouples and a duplex pressure gauge are required before replacing an approved carrier EVA completely. The resulting foam parts are used for insoles, yoga blocks, and marine floatation products where the property trade-off between processability and compression resistance is commercially acceptable.
Molten paraffin systems that require elevated scuff resistance and glue acceptance can be modified with HANWHA EVA 2250 at addition levels of 1–5 wt% in a steam-heated kettle at 120–140 °C, using a low-shear circulation pump rather than a high-speed disperser because mechanical shearing at temperatures below 110 °C can freeze the EVA phase before crystal refinement is complete. The copolymer functions as a wax crystal nucleator in corrugated top-coating and paperboard packaging operations where board is coated by a Mayer rod or air-knife coater at 80–120 m/min; the resulting coatings display higher 60° gloss retention after 200 simulated scuff cycles and lower water vapour transmission rates than straight paraffin coatings. Production units commonly set a crystallization cooling ramp of 5–10 °C/min after application because rapid quenching below 70 °C yields large wax crystals and reduces surface slip. Additive compatibility is constrained: blends containing free amine-based corrosion inhibitors can accelerate deacetylation and discolour the bath from water-white to yellow at 150 °C. Coating weight is generally held between 20–40 g/m² on kraft linerboard, and water vapour transmission rate is measured under ISO 2528:2017 at 38 °C and 90% RH. Compliance for indirect food contact is evaluated under 21 CFR 176.170 for paper and paperboard components, while volatile emissions from the molten wax bath are monitored using ASTM D2369 for non-volatile solids and a photoionization detector for acetic acid above 1 ppm. The final coated board is used for produce trays, frozen food outer wraps, and postal packaging where wax migration resistance and low-temperature flexibility are required.
Halogen-free flame-retardant cable compounds based on EVA/PE blends frequently incorporate HANWHA EVA 2250 as a polar, low-viscosity compatibilizer fraction at 5–15 wt% to offset the viscosity increase caused by aluminium trihydrate or magnesium dihydrate loadings of 120–170 phr. In a 44:1 L/D co-rotating twin-screw extruder with side feeding, the EVA phase lowers compound melt temperature by 5–10 °C at constant screw speed and permits filler dispersion without exceeding 190 °C, the boundary above which aluminium trihydrate releases water and creates porosity in the extrudate. The downstream cable extrusion line then processes the compound through a 90 mm single-screw extruder with a 25:1 L/D low-compression barrier screw at temperature settings between 140–180 °C; manufacturers use pressure transducers before the screen pack to detect filler agglomerates and maintain a melt pressure below 20 MPa. Finished sheathing is tested under IEC 60754-1:2011 for halogen gas emission, IEC 61034-2:2019 for smoke density, and ISO 4589-2:2017 for limiting oxygen index, with values above 34% O₂ normally required for this class of material. Tensile properties must meet 9–11 MPa tensile strength and elongation at break above 150% according to IEC 60811-501 after ageing 168 h at 100 °C. A recognised process limitation is the reduction of heat deformation resistance when EVA 2250 is added above 15 wt%; deformation at 90 °C under load rises, and compounders frequently blend the grade with a lower-melt-flow-rate EVA or an ethylene-octene elastomer to recover mechanical integrity. The compounder must also dry the EVA if silo condensation occurs at relative humidity above 60% to prevent surface voids in the final cable jacket. This application segment is more sensitive to shear heating than adhesive compounding because the filled system approaches adiabatic conditions inside the metering zone, and barrel thermocouple set points alone do not reflect the actual melt temperature at the die exit.
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Hanwha EVA 2250 is an ethylene vinyl acetate copolymer supplied by Hanwha Solutions as a pelletized resin for melt-extrusion and injection-molding operations. The grade designation encodes a nominal vinyl acetate content of 22.5 wt% and a nominal melt mass-flow rate of 5.0 g/10 min when determined at 190 °C under a 2.16 kg piston load in accordance with ASTM D1238. The polymer is produced in a high-pressure ethylene copolymerization process in which vinyl acetate insertion disrupts polyethylene crystallinity, producing a semicrystalline resin with a density near 0.94 g/cm³ when measured by ISO 1183-1:2019 or ASTM D1505. Differential scanning calorimetry under ISO 11357-3 typically resolves a broad melting endotherm with a peak near 84 °C, although the exact peak temperature varies with cooling rate and comonomer distribution. The material combines lower flexural modulus and higher elongation than low-density polyethylene with polar adhesion to fillers, cellulosic substrates, and polyurethane coatings. It is therefore positioned between lower-vinyl-acetate stiffness grades and higher-vinyl-acetate elastomeric grades in the Hanwha EVA portfolio.
Lot-to-lot verification should rely on the resin certificate of analysis, because narrow property ranges are controlled during polymerization and subsequent pelletization. The following table lists commonly applied test methods and representative target values for a 22.5 wt% vinyl acetate EVA with a melt flow rate near 5.0 g/10 min. The values are not a substitute for Hanwha Solutions lot-specific data and should be confirmed against the stated standards.
| Property | Standard / method | Representative value |
|---|---|---|
| Melt mass-flow rate | ASTM D1238, 190 °C/2.16 kg | 5.0 g/10 min |
| Vinyl acetate content | ASTM D5594 (FTIR) | 22.5 wt% |
| Density at 23 °C | ISO 1183-1:2019 / ASTM D1505 | 0.94 g/cm³ |
| Peak melting temperature | ISO 11357-3, 10 °C/min | 84 °C |
| Tensile strength at break | ISO 527-2 type 1A, 50 mm/min | Certificate of analysis dependent |
| Elongation at break | ISO 527-2 type 1A, 50 mm/min | Certificate of analysis dependent |
The melt flow rate of 5.0 g/10 min places EVA 2250 in a medium-flow region suited to both single-screw extrusion and injection molding without plasticizer addition to achieve processable viscosity. The melt is pseudoplastic, and branched EVA melts of this composition class commonly exhibit a power-law index of approximately 0.35 to 0.45 across shear rates from 10 s⁻¹ to 1000 s⁻¹; this range should be confirmed on the specific lot by capillary rheometry. The reduced crystallinity also lowers melt elasticity compared with high-density polyethylene, which reduces die swell and improves draw-down control in thin film and coating lines. Because secondary crystallization can continue for several hours after molding, mechanical comparison testing should be preceded by conditioning at 23 °C and 50% relative humidity for at least 40 h according to ISO 291 or ASTM D618.
The acetate ester side group is the primary thermal vulnerability of EVA copolymers. Under thermogravimetric analysis at 10 °C/min in inert atmosphere, acetic acid elimination becomes detectable near 200 °C and accelerates above 250 °C; the onset shifts lower in the presence of oxygen, copper ions, or acidic residues. Melt processing should therefore avoid melt temperatures above 220 °C, and hot-runner injection tools should limit residence time at such temperatures to less than 5–10 min to avoid yellowing, gel formation, and loss of adhesion. On a single-screw extruder with a 30:1 L/D ratio, a barrel profile from 150 °C at the feed throat to 180–200 °C at the die is suitable for film and sheet lines. Screws with a compression ratio of 2.5:1 to 3.0:1 and a barrier section improve melting uniformity because the high-comonomer resin softens more readily than linear low-density polyethylene. Downstream pressure at the breaker plate should be monitored; sustained melt pressure above 300 bar may indicate unmelts or gel accumulation causing output instability. If acetic acid is liberated during a machine fault or purge, stainless-steel downstream equipment and local exhaust ventilation are required because the acid can corrode carbon steel and copper alloys.
Drying and storage conditions are not severe for EVA 2250, but surface moisture after humid storage can generate splay in cast film and reduce foaming uniformity. If pellets have been exposed to relative humidity above 60%, a desiccant-bed dryer set at 60 °C for 4 h is recommended before processing. Drying temperatures above 70 °C should be avoided because pellet surface tack can initiate hopper bridging. The resin should be stored indoors below 35 °C, away from ultraviolet light and oxidizing agents; photooxidative chain scission at the acetate group can shift the melt flow index and reduce heat-seal strength. Processors should not combine EVA 2250 with amine-based additives when a peroxide cure is planned later, because amine radicals consume peroxide and retard crosslinking.
Lower-vinyl-acetate copolymers in the 12–18 wt% range retain greater polyethylene crystallinity and therefore exhibit higher flexural modulus, higher tensile strength, and better dimensional stability, but lower clarity, lower adhesion to polar surfaces, and reduced low-temperature impact resistance. EVA 2250 at 22.5 wt% vinyl acetate reduces crystalline sequence length sufficiently to shift behavior toward elastomeric response: elongation at break rises, Shore hardness decreases, and the material remains flexible below -40 °C. The property change is not linear with vinyl acetate content. The largest changes often occur between 15 wt% and 25 wt% vinyl acetate because crystalline lamellae are disrupted beyond a threshold where secondary crystallization can no longer restore stiffness. A converter choosing between an 18 wt% vinyl acetate grade and EVA 2250 can expect the higher-vinyl-acetate material to accept higher filler loadings, produce softer foam, and bond more reliably to polyurethane cements, but it will exhibit greater creep under load and lower resistance to hydrocarbon solvents. These trade-offs should be evaluated with ISO 527-2 for tensile properties, ISO 178 for flexural modulus, ASTM D2240 for durometer, and ASTM D1693 for environmental stress-crack resistance.
In cast film and sheet extrusion, EVA 2250 is usually processed at chill-roll temperatures between 10 °C and 25 °C. The low crystallinity reduces blocking and permits high-clarity sheet when appropriate antiblock is included. Heat-seal initiation temperature is lower than that of low-density polyethylene, and peel strength on heat-sealed films should be measured according to ASTM F88 when sealing jaws are being optimized. In chemically cross-linked foam, the resin can be compounded with azodicarbonamide blowing agent and dicumyl peroxide crosslinking agent on a two-roll mill or internal mixer at temperatures below 110 °C to prevent premature cure. The compounded sheet is then expanded in a press or continuous foaming oven at 160–190 °C. Cure and expansion must be balanced: premature gas release before sufficient gelation produces cell collapse, while excessive crosslinking restricts expansion and increases foam density. Zinc oxide or other acid acceptors can shift azodicarbonamide decomposition downward from its unactivated onset near 205 °C, keeping expansion closer to the EVA processing window. A continuous foaming line often requires a zoned oven and belt-speed control so that the compound reaches gelation before full blowing-agent decomposition. On production-scale equipment, cure is characterized by moving-die rheometry at 180 °C, and foam density is measured according to ISO 845. For injection-molded foam components such as midsoles, the melt is injected at reduced shot size so that foaming fills the cavity; vents must be machined to allow gas escape, and clamp force must resist mold opening from internal blowing pressure. Published data for EVA 2250-specific foaming formulations is limited, so the resin manufacturer’s technical service recommendations should be used for initial formulation work.
Hot-melt adhesive and wax-blend operations use the 5.0 g/10 min melt flow index to balance wet-out and cohesive strength. On a twin-screw extruder with 40:1 L/D, tackifier dispersion can be conducted at 120–170 °C, but a temperature gradient after the feed zone prevents low-melting tackifier from forming a separate liquid phase that reduces shear. EVA 2250 has a polar acetate group, so its molten surface wets paper and boardstock with a lower contact angle than metallocene polyethylene; the practical result is faster fiber-tear adhesion in hot-melt bonding. However, head-space extraction is required when melt temperatures exceed 200 °C because acetic acid and oligomeric fractions are volatile at those temperatures. The resin should not be held over copper or copper-alloy hot-melt tank surfaces for extended periods because heat plus liberated acetic acid accelerates corrosion.
Ethylene methyl acrylate and ethylene butyl acrylate copolymers provide polarity without the acetic acid elimination pathway. They can be processed at higher temperatures with less risk of acid-catalyzed degradation, but they often exhibit higher surface tack and different mechanical strength at equivalent comonomer content. EVA 2250 provides a different adhesion-to-cost position in packaging and footwear compounds, but comparative selection depends on service temperature and ultraviolet exposure. Metallocene linear low-density polyethylene offers higher puncture resistance and better organoleptic properties, but it lacks the polar adhesion and filler-carrying capacity of EVA 2250. Where a converter requires low-temperature flexibility plus adhesion to paper, polyethylene fiber, or polyurethane coatings, EVA 2250 is commonly evaluated first; where sustained service above 150 °C is required, polyamide-based systems or crosslinked hydrocarbon elastomers are more appropriate. These differences are quantified by ISO 527-2 tensile modulus, ASTM D1003 haze, ASTM D1693 environmental stress-crack resistance, and ISO 1133-1:2022 melt mass-flow rate.
EVA copolymers may be evaluated for food-contact articles under FDA 21 CFR 177.1350 when the finished article meets the extractables limitations specified in that section. The converter, not the resin supplier, is responsible for end-use compliance. For European Union applications, overall migration testing should be performed on the finished article according to the applicable parts of EN 1186-1 and the relevant annexes of Commission Regulation EU 10/2011. No specific compliance should be inferred without a letter of guarantee from Hanwha Solutions for the purchased lot. The product is not recommended for continuous load-bearing service above 80 °C, because creep and compression set increase as crystallinity declines. Strong acids, strong bases, and ketone-containing cleaning solvents should be avoided because they attack the acetate group or swell the amorphous phase. Pro-oxidant masterbatches intended for degradable polyolefin films should not be blended with EVA 2250 unless accelerated aging is an explicit performance requirement.
