| HS Code | 448438 |
| Chemical Name | Ethylene Vinyl Acetate Copolymer |
| Vinyl Acetate Content | 28 wt% |
| Melt Flow Rate | 43 g/10 min at 190°C / 2.16 kg |
| Density | 0.951 g/cm³ |
| Melting Point | 90 °C |
| Glass Transition Temperature | -40 °C |
| Tensile Strength At Break | 12.7 MPa |
| Elongation At Break | 800% |
| Shore A Hardness | 75 |
| Vicat Softening Point | 64 °C |
| Brittleness Temperature | -100 °C |
| Flexural Modulus | 50 MPa |
As an accredited ELVAX 240W Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 240W Ethylene Vinyl Acetate Copolymer is supplied as pellets, packaged in 25 kg multi-layer bags for safe handling and transport. |
| Container Loading (20′ FCL) | 20′ FCL loading: ELVAX 240W ethylene vinyl acetate copolymer in palletized bags, securely stowed, weight-optimized, with moisture and heat protection. |
| Shipping | ELVAX 240W (Ethylene Vinyl Acetate Copolymer) is shipped as a non-hazardous solid resin. Pack in sealed, moisture-resistant containers (polyethylene-lined bags, drums, or boxes) to prevent contamination. Store away from heat, ignition sources, and strong oxidizers. No UN classification required. Ensure dry, ventilated transport to preserve material integrity. |
| Storage | Store ELVAX 240W in a cool, dry, well-ventilated area away from direct sunlight, ignition sources, and strong oxidizers. Keep containers tightly closed to prevent moisture pickup, dust accumulation, or contamination. Avoid prolonged exposure to temperatures above 30°C to prevent pellet sticking or clumping. Ensure proper personal protective equipment when handling. |
| Shelf Life | Store in a cool, dry place. Shelf life is typically two years from manufacture when kept in original, unopened containers. |
High-speed hot-melt adhesive compounding with ELVAX 240W depends on the 28 wt% vinyl acetate monomer content and 43 g/10 min melt index (ASTM D1238, 190 °C/2.16 kg) to maintain solubility parameter compatibility with hydrogenated rosin esters and Fischer-Tropsch waxes. Bulk case-sealing and bookbinding formulations typically load ELVAX 240W at 22–35 wt%, with tackifier at 30–45 wt% and wax at 20–35 wt%; Brookfield viscosity at 175 °C measured per ASTM D3236 is maintained between 1,200 and 2,800 mPa·s. Below 18 wt% EVA, peel adhesion on recycled corrugated fails cohesively; above 38 wt%, gear pump suction pressure becomes unstable in continuous roll coaters. Production-scale vertical mixers with 250–500 kg batch capacity and sigma blades operate at 150–170 °C under a 0.05–0.1 bar nitrogen blanket to minimize acetic acid evolution from vinyl acetate groups; the melt is transferred through heated filters to slot die or roller coaters at 160–175 °C. Indirect food contact compliance relies on FDA 21 CFR 175.105; REACH Regulation (EC) No 1907/2006 requires supplier declarations for any SVHC in tackifier and wax streams. Terminal product types include corrugated case sealing, softcover book spine adhesive, folding carton side seam, and spiral-wound paper tube lamination.
For corrugated board impregnation, addition of ELVAX 240W to refined paraffin wax at 2–8 wt% of the total compound lowers flex cracking at low transport temperatures and reduces blocking on stacking belts without causing the cloud point to drift outside the coating supplier’s process specification; cloud point is measured by ASTM D2500. The production sequence uses a steam-jacketed blend kettle with turbine agitation at 120–140 °C; pellets are introduced after the paraffin reaches full melt, and circulation continues for 30–45 min until a single-phase melt is confirmed by turbidity reading. The compounded wax is then applied by dip coater or curtain coater at 60–120 m/min to corrugated board with 180–250 g/m² base paper. Addition below 2 wt% results in flaking at -10 °C, and addition above 10 wt% produces viscosity instability on metering rolls. Compliance under FDA 21 CFR 176.170 and EC 1935/2004 governs components of paper and paperboard intended for aqueous and fatty food contact; EU 10/2011 Article 3 requires finished coated board migration testing for vinyl acetate monomer before use in food packaging. Terminal finished products include wax-impregnated produce cartons, seafood shipping boxes, and frozen food case liners.
Typically, down-gauged heat-seal webs containing 20–50 wt% ELVAX 240W in the skin layer exhibit a measurable reduction in seal initiation temperature compared with octene-LLDPE control films, with hot tack measured according to ASTM F1921. The sealant layer is coextruded onto biaxially oriented PET or polyamide substrates via a cast film line with chill roll held at 15–20 °C; die gap is 0.7–1.0 mm and line speed 80–150 m/min. Addition ratio is constrained by slip additive migration: above 50 wt% EVA, erucamide bloom can reduce seal strength, measured by ASTM F88, after 14 days at 40 °C; below 20 wt%, low-temperature seal initiation needed for vertical form-fill-seal operation is lost. Melt curtain flutter at high draw ratios occurs when melt strength is insufficient; air gap must be reduced to 80–120 mm. Food contact compliance is established under FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers and EU 10/2011 with specific migration limit for vinyl acetate according to Annex I. Finished product types include liquid sachets, snack pouches, lidding film for dairy cups, and sterile barrier overwrap.
At the compounding stage, a co-rotating twin-screw extruder with 36:1–44:1 L/D must be configured with an upstream atmospheric vent and downstream vacuum devolatilization at -0.08 MPa to extract moisture from alumina trihydrate and magnesium dihydroxide prior to pelletizing. Pellets stored at relative humidity above 60% require pre-drying at 70–80 °C for 4–6 h before compounding to avoid void formation in the extrudate. ELVAX 240W is added at 20–35 wt% of the polymer phase alongside 50–65 wt% metal hydrate filler; maleic anhydride-grafted polyethylene at 5–10 wt% reduces filler-polymer interfacial failure. The 28 wt% vinyl acetate content polarizes the matrix, allowing filler dispersion at 140–180 °C barrel temperatures without exceeding the deacetylation threshold of vinyl acetate groups near 190 °C. Die pressure fluctuations on the pelletizing die of the twin-screw extruder are maintained below ±1.5 MPa to avoid screen pack plugging; acid scavenger addition is required when recycled process trim exceeds 15 wt%. Low smoke halogen-free compounds are tested to IEC 60754-1 for halogen acid gas content, IEC 60754-2 for pH and conductivity, and IEC 61034-2 for smoke density during combustion; RoHS Directive 2011/65/EU applies to lead, cadmium, and brominated flame retardants. The material is not recommended for continuous conductor temperatures above 90 °C unless blended with crosslinkable polyethylene and peroxide. Terminal sheathing products include building distribution cables, control cables, and rail transit power cables.
A high melt index of 43 g/10 min (ASTM D1238, 190 °C/2.16 kg) permits EVA/LDPE foam compounders to incorporate ELVAX 240W at 5–15 wt% as a flow modifier without reducing melt strength below the level required for cell nucleation with azodicarbonamide blowing agents. In injection-molded cellular footwear midsole production, the grade is preblended with 15–25 wt% LDPE and 0.5–1.2 wt% dicumyl peroxide; barrel temperatures are maintained at 160–185 °C and injection pressure is set below 80 MPa to prevent premature gas evolution in the plastication zone. The high vinyl acetate content increases compatibility with zinc oxide, zinc stearate, and precipitated silica nucleators, but batch-to-batch variance in pellet surface moisture above 0.1 wt% is a known cause of cell coalescence and shrinkage in parts with wall thickness above 12 mm. Compliance for footwear components exported to the EU is assessed under REACH Regulation (EC) No 1907/2006 and, when specified by the buyer, ASTM D3575 for flexible cellular olefin materials; published data for ELVAX 240W-specific cell morphology under industrial injection molding conditions are limited, and mold trials should include SEM cell-size distribution verification before series release. Terminal product types include injection-molded midsoles, foam insoles, and shock-absorbing padding.
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ELVAX 240W is supplied as a pelletized ethylene-vinyl acetate copolymer with a vinyl acetate content of 28 wt% and a melt flow rate of 43 g/10 min at 190°C under a 2.16 kg load, determined in accordance with ASTM D1238 and ISO 1133-1:2022. The density at 23°C is 0.95 g/cm³ when measured by ASTM D1505. The material is a random thermoplastic copolymer intended for compounding rather than for unsupported extruded film or high-strength injection molding. The 28 wt% vinyl acetate content reduces polyethylene crystallinity, increases polarity, and broadens compatibility with hydrogenated hydrocarbon tackifiers, rosin esters, and paraffin waxes. The resin is soluble in aromatic and chlorinated hydrocarbons at elevated temperature but has limited solubility in pure aliphatic solvents at room temperature.
Within the ELVAX product family, the numeric grade designation differentiates melt flow rate rank, not vinyl acetate content. ELVAX 240W therefore has the same vinyl acetate content as ELVAX 250 and ELVAX 260 but a higher melt flow rate than both. This distinction governs selection in hot-melt application systems, spray nozzles, and roller coaters where pressure drop, wet-out time, and pump shear constrain viscosity. The 43 g/10 min melt index corresponds to a low melt viscosity favorable for penetration into recycled paperboard and for high-speed slot coating, but it reduces melt tenacity and can produce stringing if the adhesive is overheated or if the elastomer content is too low.
The primary uses are hot-melt adhesives for case and carton sealing, bookbinding, and packaging, secondary wax modification, solvent-borne contact adhesives, and sealant compounding. Because melt flow rate is high relative to ELVAX 250 and ELVAX 260, ELVAX 240W is preferred in spray application systems and in formulations where lower application temperature is required. It is not recommended where high melt strength is needed, such as thick-walled extruded profiles or blown film.
Table 1 compares supplier-typical datasheet values for five EVA grades. The comparison is limited to typical physical properties; final adhesive performance depends on tackifier type, wax melting point, filler content, and processing history.
| Grade | Vinyl acetate content (wt%) | Melt flow rate at 190°C/2.16 kg (g/10 min) | Density at 23°C (g/cm³) |
|---|---|---|---|
| ELVAX 240W | 28 | 43 | 0.95 |
| ELVAX 250 | 28 | 25 | 0.95 |
| ELVAX 260 | 28 | 6 | 0.95 |
| ELVAX 350 | 25 | 19 | 0.95 |
| ELVAX 450 | 18 | 8 | 0.94 |
The data in Table 1 demonstrate that vinyl acetate content and melt flow rate are independent parameters. ELVAX 240W and ELVAX 250 share 28 wt% vinyl acetate but differ by 18 g/10 min in melt index. The lower melt viscosity of ELVAX 240W permits lower application temperature and faster wet-out but reduces cohesive strength at elevated temperature compared with ELVAX 250. ELVAX 260 provides the highest melt strength among the three because of its 6 g/10 min melt index, making it suitable for low-shear extrusion and cable compounding but too viscous for many spray applications. Compared with ELVAX 350 at 25 wt% vinyl acetate, ELVAX 240W improves adhesion to polar substrates such as polyvinyl chloride, corona-treated polyethylene terephthalate, and aluminum foil. Compared with ELVAX 450 at 18 wt% vinyl acetate, ELVAX 240W has lower crystallinity and hardness but greater low-temperature flexibility, tackifier compatibility, and filler acceptance.
In high-speed packaging lines operating at 800–1,200 cartons/min, the hot-melt adhesive is applied by slot-coater or spiral-spray nozzle at 160–170°C. A typical formulation containing 30 wt% ELVAX 240W, 40 wt% hydrogenated hydrocarbon tackifier, and 30 wt% paraffin wax with a congealing point of 65°C is melted in a heated reservoir and pumped through a heated hose to the applicator. Under ASTM D3236, Brookfield Thermosel viscosity at 180°C for such a system is typically between 800 and 1,500 mPa·s, depending on tackifier softening point and wax molecular weight. The high melt index of ELVAX 240W helps wet recycled corrugated board within the short open time, but the molten film remains thermally sensitive if held above 180°C for prolonged periods.
Production-scale compounding of this formulation is carried out in a 200 L sigma-blade mixer heated to 150°C. Antioxidant is added before the resin reaches 130°C to limit chain degradation; 2,6-di-tert-butyl-4-methylphenol is typically used at 0.1–0.5 phr. In continuous operations, a co-rotating twin-screw extruder with an L/D ratio of 40:1 and barrel set points from 120°C to 170°C is used, with screw speed maintained at 250–350 rpm and vacuum devolatilization at -0.08 MPa to remove residual moisture and thermal degradation products. If barrel temperatures exceed 200°C, acetic acid evolution becomes measurable and can corrode uncoated steel contact surfaces; addition of 0.5–1.0 wt% zinc stearate is practiced to scavenge released acid.
A common processing bottleneck occurs when residual pellet moisture exceeds 0.05 wt%, producing bubble entrapment in the hot-melt reservoir and erratic nozzle deposition. Pre-drying at 45–55°C for 4–6 h in a desiccant dryer is required when warehouse relative humidity exceeds 60%.
Open-time and set-time measurements are formulation-specific; a packaging adhesive based on ELVAX 240W typically has open times of 3–8 s and set times of 0.5–1.5 s at 25°C substrate temperature. The melt viscosity at application temperature must be controlled within ±10% of nominal to maintain nozzle deposition weight. High-speed lines use positive-displacement gear pumps and pressure transducers to maintain adhesive delivery; viscosity excursions above 2,000 mPa·s can cause nozzle starvation and inconsistent bond line thickness. Thermal stability is assessed by sealing a 50 g sample in a glass jar under nitrogen at 180°C for 72 h; viscosity should not increase by more than 5%, and char or gel should not form.
Selection of ELVAX 240W instead of a lower-VA grade such as ELVAX 450 is justified when the finished adhesive must remain flexible at frozen-food temperatures while accepting high filler volume. The 28 wt% vinyl acetate content lowers the brittle point relative to low-VA EVA; differential scanning calorimetry per ASTM D3418 typically shows a melting peak below 80°C for high-VA grades, while low-temperature brittleness is qualified by ASTM D746 at -20°C or -40°C on the finished compound. In filled systems, the polar vinyl acetate segment interacts with calcium carbonate, barium sulfate, and hydrated alumina, permitting filler loadings up to 40 wt% without complete loss of cohesive strength.
The tensile strength at break of unfilled compression-molded ELVAX 240W sheet tested under ASTM D638-14 is below 10 MPa, consistent with high co-monomer content. Elongation at break typically exceeds 700%, but published data for this specific configuration is limited and should be obtained from the supplier certificate of analysis. ELVAX 240W is not selected for structural adhesives requiring shear adhesion failure temperature above 100°C; a lower-MI grade or a reactive polyurethane system is used instead.
In wax-based investment casting and paraffin modification, addition of 5–15 wt% ELVAX 240W to paraffin and microcrystalline wax increases toughness and reduces cracking of thin patterns. At addition levels above 15 wt%, surface tack and blocking can become unacceptable for handling. The high-VA content also reduces the blocking point of the wax blend and increases oil binding capacity in candle and coating applications.
Solvent-borne contact adhesives based on ELVAX 240W are compounded at 15–20 wt% solids in toluene, xylene, or a toluene/methyl ethyl ketone blend. High-shear dissolution at 1,000–1,500 rpm in a cowles dissolver is maintained below the solvent flash point; after complete solvation, viscosity at 25°C is adjusted with additional solvent to meet the coating head specification. The high melt index of ELVAX 240W yields lower solution viscosity at equal solids than ELVAX 260, allowing higher solids application and shorter drying time. The high vinyl acetate content increases susceptibility to polar solvent attack and limits use with pure aliphatic solvent systems at room temperature.
For food-contact hot-melt adhesives, compliance is assessed on the finished formulation rather than on the polymer alone. Under 21 CFR 177.1350, ethylene-vinyl acetate copolymers may be used as articles or components of articles intended for food contact provided the extractive limits and end-use conditions of the regulation are met. Under EU Regulation 10/2011, the vinyl acetate and ethylene monomers are subject to specific migration limits, and an overall migration limit is established for finished plastic articles. For electrical and electronic applications, a RoHS compliance statement under Directive 2011/65/EU is required when the compounded EVA is used as an encapsulant or coating.
| Regulation/Standard | Scope | Typical status for ELVAX 240W containing formulation |
|---|---|---|
| FDA 21 CFR 177.1350 | Repeated food-contact articles | Compliant when finished article meets extractives limits and use conditions |
| EU Regulation 10/2011 | Plastic food-contact materials | Monomer-specific migration limits and overall migration limit apply; formulation-specific testing required |
| RoHS Directive 2011/65/EU | Heavy metal restrictions | No heavy metals intentionally added; supplier certification and ICP-OES verification required |
| REACH Regulation 1907/2006 | Polymer registration exemption | Monomers and additives must be registered; polymer as such is exempt |
ELVAX 240W should not be combined with amine-based alkaline additives during melt processing, because residual acidity from vinyl acetate hydrolysis accelerates chain scission and yellowing. Strong oxidizing agents and halogenated solvents at elevated temperature can cause dehydrohalogenation and gelation. The compound is not suitable for continuous service at 70°C or above under load without crosslinking, because the crystalline network is lost near the melting point. If the finished adhesive is exposed to outdoor weathering, ultraviolet stabilizers are required because the vinyl acetate segment is sensitive to photo-oxidative degradation.
