| HS Code | 302713 |
| Vinyl Acetate Content | 40 wt% |
| Melt Flow Index | 52 g/10 min (190°C, 2.16 kg) |
| Density | 0.965 g/cm³ |
| Melting Point | 104°C |
| Vicat Softening Point | 71°C |
| Brittleness Temperature | -100°C |
| Tensile Strength At Break | 12 MPa |
| Elongation At Break | 800% |
| Flexural Modulus | 55 MPa |
| Hardness Shore A | 78 |
| Hardness Shore D | 30 |
| Volume Resistivity | 1 x 10^16 ohm·cm |
As an accredited ELVAX 40W Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 40W EVA copolymer is supplied as free-flowing pellets in 25 kg multilayer paper bags, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | ELVAX 40W EVA copolymer pellets in 25kg bags, palletized, loaded into a 20-foot full container, secured and protected from moisture. |
| Shipping | ELVAX 40W ships in sealed, moisture-resistant bags or cartons, non-hazardous under standard transport regulations. Store away from heat, ignition sources, and direct sunlight. Avoid compression or rough handling to preserve pellet integrity. Standard freight methods apply; keep dry and ventilated. Refer to SDS for full handling and disposal details. |
| Storage | Store ELVAX 40W (ethylene vinyl acetate copolymer) in a cool, dry, well-ventilated area away from direct sunlight, heat, and open flames. Keep containers tightly sealed when not in use to prevent moisture absorption and contamination. Avoid storage above 50°C (122°F) to prevent blocking or deformation. Maintain adequate ventilation and follow manufacturer guidelines for shelf life. |
| Shelf Life | Store in a cool, dry place away from direct sunlight. Typical shelf life is two years from the date of manufacture. |
In high-speed case and carton closing, the polymer backbone of a hot-melt adhesive is melt-compounded with tackifier resin and wax, then delivered to the substrate by slot-die or wheel application. Elvax 40W is an ethylene vinyl acetate copolymer with a vinyl acetate comonomer level of 40 wt% and a melt flow index of 52 g/10 min when measured at 190°C under a 2.16 kg load in accordance with ISO 1133-1:2022. The high polar acetate content permits high loading of rosin ester tackifiers, but aliphatic hydrocarbon tackifiers tend to phase-separate when they exceed 15 wt% of the total tackifier package. Production compounding is performed in a jacketed sigma-blade mixer or a co-rotating twin-screw extruder with an L/D ratio between 36:1 and 48:1, using melt-zone temperatures of 140°C to 160°C; the lower temperature boundary is set by complete resin melt-out, while the upper boundary limits thermal deacetylation and acetic acid formation. A typical formulation for corrugated tray erection contains 30–35 wt% Elvax 40W, 35–38 wt% rosin ester tackifier, 25–30 wt% paraffin wax, and 0.5–1.0 wt% hindered phenolic antioxidant. Application on high-speed case sealers is run at 160–175°C; Brookfield Thermosel viscosity at 180°C is measured according to ASTM D3236-18 and generally falls between 700 mPa·s and 3,000 mPa·s, depending on wax molecular weight and tackifier softening point. On recycled corrugated board with high porosity, line speeds above 40 m/min require an open time below 1.5 s; increasing Elvax 40W from 28 wt% to 35 wt% extends open time but also raises melt viscosity, which can exceed the pressure limit of unheated slot-die heads. Heat stability is monitored by viscosity drift and colour after 72 h at 175°C under ASTM D4499-07; T-peel adhesion is measured on kraft linerboard per ASTM D1876-08. For food-contact packaging, the adhesive may be evaluated under 21 CFR 175.105; the base resin is listed for food-contact use under 21 CFR 177.1350 where the copolymer falls within specified density and extractables limits. This grade is not recommended for direct adhesion to high-density polyethylene or UV-cured overprint varnish without corona or plasma pre-treatment.
Addition of Elvax 40W to fully refined paraffin wax at 2–6 wt% alters wax crystal growth in curtain-coated and roller-coated paperboard for wet-pack seafood boxes, produce cartons, and freezer-grade wraps. The copolymer is dissolved into molten paraffin in a low-shear melt tank at 130–145°C; complete clarification generally occurs within 30–60 min when the wax is held 10–15°C above its final coating temperature. Coating is performed on a curtain coater or reverse-roll coater at 120–160°C, followed immediately by contact with chilled rolls to lock the surface and prevent blocking. At 4 wt% addition, Brookfield viscosity at 135°C typically increases to 120–250 mPa·s, though the exact value depends on paraffin carbon-number distribution and the presence of residual paraffin oil. The modified wax coating resists oil bleeding from the board and improves crease resistance when the package is handled at 2–7°C; needle penetration may be tested by ASTM D1321-16a. Above 8 wt% copolymer addition, curtain stability can deteriorate on coaters with narrow slot gaps because elongational viscosity growth at the edges produces uneven splitting and edge necks; melt filter pressure may also rise in closed-loop wax recirculation systems. Moisture-vapour transmission of coated board is determined by ISO 2528:2017 or ASTM F1249-20, with the copolymer addition generally reducing WVTR. For food-contact use, the coated paperboard is assessed under 21 CFR 176.170 for aqueous and fatty food contact and 21 CFR 176.180 for dry food; the ethylene vinyl acetate copolymer is also referenced under 21 CFR 177.1350. Wax bases containing more than 10 wt% processing oil should be pre-screened for oil compatibility because the 40% vinyl acetate phase absorbs certain low-MW oil fractions, which may alter film hardness and blocking characteristics.
For heat-seal aluminium lidding and medical pouch structures, heat-seal lacquers are produced by dissolving Elvax 40W in aromatic/alcohol or ketone/alcohol blends at solids contents of 18–30 wt%. The solution is diluted to a flow time of 30–60 s on a DIN 4 mm flow cup; higher solids may overfill direct gravure cells and cause comet-tailing or streaks. Coatings are applied by direct gravure or reverse-roll coating onto aluminium foil, polyester film, or paper, then dried in multi-zone ovens with zone temperatures from 50°C to 85°C. Residual solvent is a critical process parameter because retained solvent above 10 mg/m² can create voids in the heat-seal interface and produce off-odour in the finished pouch. Seal initiation on aluminium foil begins near 80°C at a dwell of 0.5–1.5 s and jaw pressure of 0.3–0.6 MPa; seal strength is measured according to ASTM F88/F88M-21. For porous medical packaging, dye penetration testing is performed per ASTM F1929-15. EU food-contact compliance for the final dry coating is evaluated under Regulation (EU) No 10/2011, where the specific migration limit for vinyl acetate is 12 mg/kg food simulant; US compliance may be established under 21 CFR 175.300 for resinous and polymeric coatings. The coated structure is not intended for high-temperature retort peelable seals above 121°C, because softening and roll-blocking of the polar copolymer reduce reliable peel-open forces and increase fibre tear incidence on paper-backed structures.
Elvax 40W is dispersed into penetration-grade bitumen to increase high-temperature softening point, reduce cold-flow, and rigidify self-adhesive waterproofing membranes and repair mastics. Addition levels of 3–7 wt% are common; the copolymer is metered into a stirred tank equipped with a high-shear rotor-stator mixer operating at 3,000–5,000 min−1, while the bulk temperature is held at 170–190°C for 60–180 min. At copolymer contents above 7 wt%, melt viscosity at 180°C can exceed the filling-line pump limit, and prolonged hot storage without agitation can promote asphaltene flocculation. Ring-and-ball softening point is measured by ASTM D36/D36M-14; in a 70/100 penetration-grade base, a 5 wt% addition typically raises softening point by 12–25°C, but the published data for this specific configuration is limited because asphalt source, saturate content, and maltene phase composition dominate the response. Storage stability is evaluated by the softening-point difference between top and bottom samples after 72 h at 163°C using ASTM D7173-20; a difference below 2°C indicates that the modified bitumen can be held in vertical storage tanks without excessive phase separation. Low-temperature flexibility of finished waterproofing sheets is tested by cold bending according to EN 1109:2013; tensile properties of the sheet are measured by EN 12311-2:2013. EVA modification raises stiffness more efficiently than it improves elastic recovery; as a sole modifier, the material may yield elastic recovery below 70% when tested per ASTM D6084/D6084M-21. Crosslinked SBS or SBR is therefore added when high recovery after elongation is required.
In crosslinked closed-cell foam sheet for midsoles, insoles, and cushioned mats, Elvax 40W is blended with lower-vinyl-acetate EVA grades and low-density polyethylene to lower compound hardness and support high inorganic filler levels. Mixing is performed in an internal mixer or two-roll mill at 100–120°C, which is below the decomposition onset of azodicarbonamide. The blowing agent is loaded at 3–7 phr depending on target density; dicumyl peroxide is added at 0.5–1.0 phr as the crosslinking agent, with zinc oxide and stearic acid as cure activators. The compounded sheet is expanded and cured in a hydraulic press at 150–170°C for 8–15 min under 10–15 MPa. The high melt flow index of 52 g/10 min reduces compound viscosity during the initial plastication stage, but gas retention requires the peroxide network to build rapidly before complete azodicarbonamide decomposition; if cure lags gas evolution, cell coalescence produces internal density gradients and collapsed sections near the sheet centre. Foam density is typically controlled from 0.08 g/cm³ to 0.25 g/cm³; apparent density is measured according to ISO 845:2006 and compression set according to ISO 1856:2018. Calcium carbonate loadings of 30–70 phr are possible, but above 50 phr tensile and tear loss become significant; published data for this specific grade in high-filler foam systems is limited. The use of the copolymer in footwear, matting, and packaging foams is assessed under REACH Annex XVII and, where applicable, California Proposition 65 for residual blowing agent residues.
Colour and additive masterbatch production uses Elvax 40W as a carrier when a high-flow, polar ethylene copolymer is required for pigment wetting and rapid letdown in polyolefin film, sheet, and injection moulding compounds. Compounding is run on a co-rotating twin-screw extruder with an L/D ratio of 40:1 to 48:1, a screw temperature profile of 100–140°C, and a vacuum vent of -0.08 MPa to remove volatiles; the low melt temperature range reduces thermal yellowing of organic pigments and preserves diketopyrrolopyrrole reds and phthalocyanine blues. Pigment loading ranges from 20–60 wt% for organic and carbon black concentrates, with a processing wax or oil level of 5–15 wt%. Melt flow index of the carrier is checked by ISO 1133-1:2022; the 52 g/10 min value supports strand pelletizing at low die pressure, but die drool and water-bath sticking occur when the strand bath temperature exceeds 20°C. A chilled water loop at 10–15°C and air knives are used to dry strands before pelletizing. Letdown in blown film is typically 2–5%, with filter pressure rise monitored across screen packs of 100–250 µm. Dispersion quality is assessed by filter pressure values and microscopic pellet cross-sections; colorimetric batch-to-batch variance is controlled under ISO 11664-4:2019 or customer-specific CIELab tolerances. For food-contact colour concentrates, the selected pigments and additives must comply with 21 CFR 178.3297 and the relevant articles in Regulation (EU) No 10/2011; the carrier resin is subject to 21 CFR 177.1350. Masterbatches based on Elvax 40W are generally not suitable for high-temperature engineering resins that process above 250°C because the carrier degrades before the matrix melts.
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ELVAX 40W ethylene vinyl acetate copolymer is a high vinyl acetate content grade supplied as pellets for adhesive compounding, solvent-based adhesive manufacture, polymer modification, and wax-blend toughening. The model designation identifies a nominal vinyl acetate comonomer content of 40 wt% and a melt index of 52 g/10 min determined by ASTM D1238 at 190 °C under 2.16 kg load. Typical density is 0.965 g/cm³ measured according to ASTM D1505. The high vinyl acetate content disrupts polyethylene crystallinity and produces lower Shore A hardness under ASTM D2240, lower tensile modulus under ASTM D638, and greater polarity than EVA grades with vinyl acetate contents below 20 wt%. Differential scanning calorimetry under ASTM D3418 shows a broad melting endotherm below 100 °C; the broad melting range reduces the sharp crystal melting typical of low-density polyethylene and lower vinyl acetate EVA grades.
Because the amorphous fraction is comparatively high, the resin yields greater conformability and substrate wetting in adhesive films. Adhesion tests are required for any particular substrate. Bond strength on corona-treated polyester, aluminium foil, paperboard, and primed polyolefin substrates is commonly measured by ASTM D1876 T-peel or ASTM D903; published data for this specific configuration is limited. The low crystallinity also increases blocking tendency in cast films; blocking force should be checked under ASTM D3354 if the film is wound before complete cooling.
The primary difference is thermodynamic and rheological. Vinyl acetate units introduce polar acetate side groups that reduce interchain crystallinity and increase free volume. As comonomer content rises from 9–18 wt% toward 40 wt%, the melting point, yield stress, and Shore A hardness decrease, while elongation and compatibility with rosin esters, phenolic tackifiers, and polar plasticizers increase. A lower-VA EVA such as a 28 wt% grade retains more crystallinity and can be suitable for some packaging sealants, but typically displays lower room-temperature tack on metalized films and higher melt viscosity when melt index is comparable. The 52 g/10 min melt index of ELVAX 40W lowers application viscosity in hot-melt coating heads without external plasticizer, but reduces cohesive strength relative to a lower-MI EVA of similar vinyl acetate content.
Wide-angle X-ray scattering data on ethylene vinyl acetate copolymers show that vinyl acetate units are excluded from the polyethylene crystal lattice and disrupt the orthorhombic crystalline structure. At 40 wt% vinyl acetate, the crystalline weight fraction is lower than 20%, although the exact value depends on thermal history and cooling rate. Slow cooling from melt increases crystallite perfection and raises the melting endotherm. Rapid quenching used in hot-melt coating lines suppresses crystallinity and increases immediate tack but can produce dimensional instability if the film is wound hot. This relationship makes ELVAX 40W more sensitive to cooling rate than lower-VA EVA grades; chill-roll temperature set point and line speed must be validated against final peel and creep performance.
The polar acetate group raises the Hansen polar solubility parameter of the copolymer, which improves solubility in ketones, esters, and aromatic solvents and increases compatibility with polar tackifier resins. This solubility shift is useful in solvent-borne adhesives but also lowers resistance to polar oils and plasticizers in the bonded assembly; oil resistance should be tested under the relevant immersion conditions. Differences from other ethylene copolymers are concentrated in thermal stability and polarity. Compared with ethylene methyl acrylate resins of similar comonomer content, the vinyl acetate unit provides a sharper polarity response in oxygenated solvents but is more prone to acetic acid liberation when overheated.
In hot-melt adhesive production, ELVAX 40W is commonly dry-blended with rosin ester tackifiers, aliphatic or aromatic hydrocarbon resins, paraffin or microcrystalline wax, and a hindered phenolic antioxidant before melt compounding. Production-scale lines often use co-rotating twin-screw extruders with L/D ratios between 32:1 and 48:1 and modular screw elements; barrel set points are typically profiled from 90 °C to 170 °C to limit thermal deacetylation. Direct manufacturing experience shows that excessive residence time above 180 °C can liberate acetic acid, which raises melt acidity and accelerates wear on unlined carbon steel equipment, while under-melted polymer can raise motor torque and reduce tackifier dispersion. High-shear dispersion is required to wet the tackifier particles into the molten EVA; screw speeds above 300 rpm are common on 40:1 L/D machines, but the exact speed depends on throughput and melt temperature limits.
Because the melt index is comparatively high, the copolymer exhibits lower melt viscosity than structural EVA grades. Slot-die and roll-coating systems can run at lower application temperatures, but the lower molecular weight restricts use in high-peel-strength structural assemblies where cohesive failure is the limiting mode. Hot-melt viscosity is evaluated by ASTM D3236 at the intended application temperature, typically between 120 °C and 160 °C for high-VA EVA adhesive formulations. Typical hot-melt formulations contain 30–45 wt% ELVAX 40W, 30–50 wt% tackifier, 10–25 wt% wax, and 0.5–1.5 wt% antioxidant. The precise ratio is adjusted so that the processing viscosity remains within the range of the application equipment, often 500–5,000 mPa·s at 160 °C for roll coaters and slot-die systems. Excessive wax loading can cause wax blooming after cooling, detected as haze and reduced peel strength after 48 h.
Solvent-borne adhesives based on ELVAX 40W are produced by dissolving the copolymer in toluene, methyl ethyl ketone, or xylene mixtures. The high vinyl acetate content increases solubility in oxygenated solvents and lowers solution viscosity relative to lower-VA EVA at the same solids loading. Coaters must control the solids level to maintain Brookfield viscosity within the range required by roller-coater or knife-coater equipment; solution viscosity is measured by ASTM D2196 at 25 °C. Solids content is generally maintained between 20 wt% and 40 wt% to balance drying time and coating weight. At equal solids, methyl ethyl ketone-rich solutions of ELVAX 40W produce lower viscosity than toluene-rich solutions because of the polar acetate group interaction with oxygenated solvents. This solvent selectivity allows formulators to reduce total solvent content or maintain low viscosity at higher solids, but requires careful control of drying-lane air temperature to avoid skin formation that traps residual solvent.
A process limitation of solvent systems is the flammability of hydrocarbon and ketone solvents; explosion-proof mixing and coating equipment is required. The copolymer should not be blended with amine-functional additives in solvent systems where residual acid from thermal processing can form amine acetates, which may raise ionic content and reduce electrical insulation performance in coated films. When the adhesive is used in laminating applications, bond strength is evaluated by ASTM D1876 T-peel after conditioning for 24 h at 23 °C and 50% RH. In flexible packaging trials, heat-seal strength is evaluated by ASTM F88, but ELVAX 40W is usually incorporated as a blend component rather than as the sole sealant resin because its high vinyl acetate content can reduce hot-tack strength at elevated temperatures. Residual solvent in laminates is measured by gas chromatography; typical targets for food-packaging laminates are below 5 mg/m², though the final limit depends on the regulatory condition of use.
Polymer modification and paraffin wax blending use ELVAX 40W as a flexibilizing polar additive. Addition levels of 5–20 wt% in paraffin wax coatings reduce brittleness and improve elongation at break when tested according to ASTM D638; the magnitude of the improvement depends on oil content, cooling rate, and wax melting point. Direct melt blending in a high-shear mixer is more common than concentrate addition. Mixing temperature is held between 110 °C and 140 °C to disperse the polymer into the molten wax without degrading the wax or forming gel particles. The melt viscosity of the blend increases non-linearly with polymer content; above 20 wt%, shear thinning becomes pronounced and requires a controlled-shear viscometer or capillary rheometer to generate process-relevant data. Crystallization temperature of the wax phase is depressed by the polymer, which can increase blocking time on coated paperboard; blocking resistance is evaluated by a converter-specific method, often a modified ASTM D3354 procedure.
Food-contact use of ELVAX 40W requires formulation-specific confirmation. US compliance may be assessed under FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers, and EU food-contact materials are evaluated under EU 10/2011 with migration testing according to the EN 1186 series. The resin does not by itself provide food-contact clearance; migration of vinyl acetate monomer, processing aids, and tackifiers must be verified in the final article. REACH and RoHS Directive 2011/65/EU declarations are supplier-specific and should be requested from the resin producer for the shipped batch. Electrical insulation applications require additional testing for volume resistivity and dielectric strength according to IEC 60093 and IEC 60243, because residual acetate groups and ionic contaminants from compounding can affect electrical properties.
Typical property values reported in producer technical documentation:
| Property | Test method | Typical value |
|---|---|---|
| Vinyl acetate content | Internal pyrolysis/gas chromatography | 40 wt% |
| Melt index | ASTM D1238 | 52 g/10 min (190 °C, 2.16 kg) |
| Density | ASTM D1505 | 0.965 g/cm³ |
| Shore A hardness | ASTM D2240 | 40 |
| Tensile strength at break | ASTM D638 | 5.2 MPa |
| Elongation at break | ASTM D638 | 1100% |
| Ring and ball softening point | ASTM E28 | 104 °C |
Storage and handling limits for ELVAX 40W include keeping the resin in closed containers at ambient temperature below 40 °C and away from direct sunlight. If the resin has been exposed to humidity above 60% RH for extended periods, pre-drying at 50–60 °C for 2–4 h in a dehumidified-air drier is recommended before extrusion to prevent surface defects in films and coatings. Thermal processing equipment should not be purged with halogenated solvents or strong oxidizers; purging compounds based on low-MI polyethylene are preferred. Amine-based additives should be avoided in high-temperature hot-melt formulations because residual acetic acid can form amine acetates and destabilize viscosity; in reactive systems amines can accelerate deacetylation.
