| HS Code | 737124 |
| Vinyl Acetate Content | 28 wt% |
| Density | 0.95 g/cm³ |
| Melt Flow Rate | 8 g/10 min (190°C, 2.16 kg) |
| Melting Point | 72 °C |
| Vicat Softening Point | 55 °C |
| Tensile Strength At Break | 14 MPa |
| Elongation At Break | 900% |
| Flexural Modulus | 25 MPa |
| Shore D Hardness | 27 |
| Brittleness Temperature | -76 °C |
| Glass Transition Temperature | -35 °C |
| Refractive Index | 1.49 |
As an accredited ELVAX CM4875 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX CM4875 Ethylene Vinyl Acetate Copolymer is supplied as pellets in 25 kg, polyethylene-lined multi-wall paper bags. |
| Container Loading (20′ FCL) | 20′ FCL container loading of ELVAX CM4875 EVA copolymer, packed in bags on pallets, secured for safe transport. |
| Shipping | ELVAX CM4875 is shipped as solid pellets in moisture-resistant bags or bulk sacks. Protect from excessive heat and humidity to prevent caking. No special hazardous shipping requirements; standard dry freight handling is suitable. Keep packages sealed until processing to maintain quality and consistency. |
| Storage | Store ELVAX CM4875 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep the original container tightly closed when not in use. Protect from moisture and humidity. Avoid contact with strong oxidizing agents. Follow manufacturer guidelines; under proper conditions, shelf life is typically extended. |
| Shelf Life | ELVAX CM4875 has a shelf life of two years when stored in original, unopened packaging in a cool, dry place away from direct sunlight. |
Melt-blending of ELVAX CM4875 in a 150 L jacketed sigma-blade mixer is carried out with 30–40 wt% resin, 30–45 wt% hydrogenated glycerol or pentaerythritol ester tackifier, 15–25 wt% Fischer-Tropsch wax, and 0.5–1.0 wt% hindered phenolic antioxidant. The resin and tackifier are first brought to 150°C, after which the wax is added to trim final viscosity. Discharge viscosity measured by ASTM D3236 is held between 1,500 mPa·s and 3,000 mPa·s at 180°C. The 2.5 g/10 min melt flow index at 190°C/2.16 kg restricts pumpability below 170°C in gear-pump hot-melt units. Air-assisted spiral spray systems are unsuitable for this rheology. Open time and set speed are controlled by Fischer-Tropsch wax chain length instead of resin ratio. Indirect food-contact compliance is referenced under FDA 21 CFR 175.105 and EU Regulation (EC) No 10/2011. Terminal products include corrugated case sealing, bookbinding, and roll-fed label lamination. Reservoir temperatures above 190°C accelerate oxidative chain scission, causing viscosity drift and char formation. Nitrogen blanketing and daily system purging are required. Pre-drying at 60–70°C for 4–6 h is specified when storage relative humidity exceeds 60%. Published data for this exact grade in adhesive formulation is limited, but the cited ranges reflect standard 18 wt% VA EVA compounding practice.
In rigid PVC modification, 5–12 phr of ELVAX CM4875 is charged into a hot-mix cycle with suspension PVC of K value 65–67, calcium-zinc stabilizer at 3–5 phr, and acrylic processing aid at 1–2 phr. The high-speed mixer is held at 115–125°C until torque drops, then the batch is discharged to a cool blender at 40°C to prevent stabilizer degradation. Extrusion of window profiles or conduit is performed at die temperatures of 180–195°C using a single-screw or twin-screw profile line. The vinyl acetate phase disperses under shear and reduces brittle failure at low temperature. Notched Izod impact strength is measured according to ISO 179-1/1eA; tensile yield stress is evaluated per ASTM D638-14. The upper addition limit is constrained by migration. At loadings above 15 phr, EVA exudation appears on extrudate surfaces, and Vicat softening temperature per ISO 306 method A50 falls below 72°C, producing creep under load. This grade is incompatible with amine-based heat stabilizers; mixed-metal systems are required. Pre-drying at 70°C for 4 h prevents moisture-induced surface defects in high-humidity plants. Terminal products include rigid window profile, electrical conduit, and pipe fittings requiring low-temperature impact resistance without complete loss of PVC stiffness.
Carbon black masterbatch production uses 55–60 wt% of ELVAX CM4875 as carrier resin, 40–45 wt% N550 carbon black, and 2–4 wt% polyethylene wax. A co-rotating twin-screw extruder with 40:1 L/D is operated from 180°C in the first barrel to 210°C at the strand die. The 2.5 g/10 min melt index provides wetting and strand strength. Filter pressure value is recorded through a 150 mesh screen pack and held below 2.0 bar per 100 kg throughput. Density is verified by ASTM D1505, melt flow index by ISO 1133-1:2022, and dispersion by 44 µm cold-drawn film inspection under transmitted light. Moisture above 0.05 wt% causes strand foaming at the die, so pre-drying at 65°C for 6 h is required. Terminal uses include agricultural mulch film, geotextile masterbatch, and irrigation pipe specification black.
A cast-film sealant layer is modified by dry blending 15–25 wt% of ELVAX CM4875 with LDPE having a melt index of 4 g/10 min. The blend is coextruded on a three-layer cast line with a die gap of 0.6–0.8 mm, melt temperature 230–245°C, and chill roll temperature 15–20°C. Heat seal initiation temperature is reduced to 85–95°C, allowing faster packaging line dwell settings. Seal strength is tested per ASTM F2029-16 and ASTM F88/F88M-21. At let-down ratios above 30 wt%, post-winding blocking increases, static coefficient of friction rises above 0.6, and haze exceeds 8% on 50 µm film unless slip and antiblock additives are included. The 18 wt% vinyl acetate content reduces heat seal initiation less dramatically than 28 wt% grades, but improves heat resistance and lowers extractables. Terminal products include frozen food pouches, liquid packaging film, and medical device overwrap. Purging with LDPE after shutdown is required because carbonized EVA deposits collect at die lips during runs longer than 8 h. Pre-drying is unnecessary below 50% relative humidity.
ELVAX CM4875 is used as the base resin in low-smoke zero-halogen cable sheathing at 100 phr, filled with precipitated alumina trihydrate at 120–160 phr, magnesium dihydroxide at 10–20 phr, aminosilane coupling agent at 1–2 phr, and processing aid at 1–3 phr. Compounding is performed on a Buss co-kneader or co-rotating twin-screw extruder with a screw temperature profile of 140–170°C. The upper limit of 190°C must not be exceeded because alumina trihydrate begins releasing water of hydration near 180–200°C, generating steam-induced porosity. Cable jacket extrusion uses a 25:1 L/D single screw with compression ratio 2.5:1, melt temperature 150–160°C, and water cooling. Tensile strength and elongation at break are tested per IEC 60811-501. Elongation below 150% indicates excessive filler content or poor silane dispersion. The 18 wt% vinyl acetate content is less polar than the 28 wt% grades used in highly filled FR compounds, so filler addition beyond 160 phr reduces tensile strength below 10 MPa and raises screw torque above 90% of drive rating. The compound passes acid gas emission limits under IEC 60754-1 and conductivity limits under IEC 60754-2; flame retardance is verified by IEC 60332-1-2. Terminal products include control cable jacket, building wire sheathing, and marine cable sheathing where halogen-free performance is specified. Incompatibility with zinc borate above 5 phr causes rapid viscosity increase during extrusion; antimony oxide is not used in halogen-free systems.
| Test parameter | Method | Acceptance limit |
|---|---|---|
| pH of combustion gases | IEC 60754-1 | ≥ 4.3 |
| Conductivity of combustion gases | IEC 60754-2 | ≤ 10 µS/mm |
| Limiting oxygen index | ISO 4589-2 | ≥ 35% |
| Tensile elongation at break | IEC 60811-501 | ≥ 150% |
Closed-cell crosslinked EVA foam for shoe midsoles and sports mats is compounded from 100 phr ELVAX CM4875, azodicarbonamide blowing agent at 2–5 phr, dicumyl peroxide at 0.8–1.2 phr, zinc oxide at 1–2 phr, and stearic acid at 0.5–1 phr. Mixing is performed in an internal mixer with ram pressure 6–8 bar and discharge temperature 100–110°C to avoid premature peroxide decomposition. The compound is sheeted on a two-roll mill at 80–90°C, then pelletized. Compression molding at 170–180°C under 150–200 kg/cm² for 8–12 min produces expansion ratios between 1.8 and 2.2. Physical properties are tested according to ASTM D3574-17; compression set at 23°C after 22 h is typically below 20%. The 2.5 g/10 min melt index raises compound viscosity at processing temperature, which is compensated by adding 2–4 phr plasticizer or selecting a higher-shear mixer. Residual moisture above 0.05 wt% creates irregular cell coalescence and surface pinholes. Terminal products include sports shoe midsoles, marine flotation mats, and protective knee pads.
Bituminous membrane modification uses 4–8 wt% EVA in oxidized bitumen for roofing felt and bridge deck membranes. High-shear mixing at 175–185°C with a 3000 rpm rotor-stator disperser is maintained for 90–120 min until the EVA phase is dispersed. Viscosity is measured by ASTM D4402 cone-and-plate at 135°C. Softening point according to ASTM D36 rises above 120°C, and low-temperature flexibility per EN 13398 is retained to −15°C. Upper modification levels are limited to 10 wt% because higher loadings cause phase inversion, storage instability, and excessive mixing viscosity. The modified bitumen is applied to polyester carrier mats and coated with mineral granules for roofing membranes. Compliance is specified under EN 14023 for polymer-modified bitumen and ASTM D6084 for storage stability. The 18 wt% vinyl acetate content provides greater compatibility with bitumen than lower-VA polyethylene, but less than SBS elastomer grades. Rutting resistance therefore improves moderately rather than elastomerically. Terminal products include heat-welded roofing membranes, self-adhesive base sheets, and bridge deck waterproofing. External heating above 200°C during processing degrades the EVA phase and must be avoided.
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ELVAX CM4875 is an ethylene vinyl acetate copolymer supplied by DuPont as a pelletized thermoplastic resin within the ELVAX portfolio. The polymer chain consists of ethylene repeat units with randomly distributed vinyl acetate comonomer; the polar acetate pendant groups reduce crystallite thickness, lower the peak melting endotherm relative to low-density polyethylene homopolymer, and increase interaction with rosin ester tackifiers, ester plasticizers, and polar substrates such as aluminium foil, corona-treated polyethylene terephthalate, and sized paperboard. The material is not a ready-to-use adhesive but a base polymer intended for compounding into hot-melt adhesives, wax blends, sealants, polymer modification, and crosslinked foam or cable compounds. Release specifications are lot-specific and include melt mass-flow rate, vinyl acetate content, density, thermal transition data, and tensile properties.
The designation CM4875 refers to a specific grade identity within the manufacturer’s system and is differentiated by a controlled vinyl acetate comonomer content and melt mass-flow rate. Because the acetate pendant group disturbs polyethylene crystallinity, the grade exhibits a lower melting onset, higher amorphous fraction, and greater polar interaction than low-vinyl-acetate extrusion grades. These structural changes influence solubility parameter, surface wetting, cohesion at elevated temperature, and low-temperature flexibility. The resin is not a standalone adhesive; it is compounded with tackifiers, waxes, plasticizers, and stabilizers to produce end-use formulations.
The grade is specified by melt mass-flow rate determined under ISO 1133-1:2022 at 190°C with a 2.16 kg piston load. Density is measured according to ISO 1183-1:2019 or ASTM D792-20 at 23°C. Vinyl acetate content is measured by Fourier transform infrared spectroscopy using ASTM D5594-18a or an equivalent internal method on a cast film of approximately 25 µm thickness. Thermal transitions are recorded by differential scanning calorimetry using ISO 11357-3:2018 at 10 K/min on the second heating cycle. Tensile properties are obtained on moulded sheets using ISO 527-2:2012 or ASTM D638-14; Shore hardness is tested after a 15 s delay on 6 mm plaques according to ISO 7619-1:2022 or ASTM D2240-15.
Within the ELVAX portfolio, CM-series grades are positioned for compounding applications in which controlled rheology and polar adhesion must be balanced. The comonomer level is the primary differentiator: lower-vinyl-acetate grades such as ELVAX 770 have a more polyethylene-like thermal profile and higher crystalline modulus, while higher-vinyl-acetate grades such as ELVAX 150 show more amorphous character, lower heat resistance, and broader compatibility with polar tackifiers. ELVAX CM4875 occupies an intermediate design space where polar adhesion and elevated-temperature cohesive strength are balanced. Published data for this specific configuration is limited, so procurement specifications should be taken from the manufacturer’s certificate of analysis rather than inferred from standard numeric grades.
| Supply specification | Test method | Test condition |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 190°C / 2.16 kg |
| Density | ISO 1183-1:2019 / ASTM D792-20 | 23°C, method A |
| Vinyl acetate content | ASTM D5594-18a / internal FTIR | Cast film, 25 µm |
| Melting peak temperature | ISO 11357-3:2018 | 10 K/min, second heat |
| Shore hardness | ISO 7619-1:2022 / ASTM D2240-15 | 15 s delay, 6 mm plaque |
| Tensile stress at break | ISO 527-2:2012 / ASTM D638-14 | 50 mm/min |
In hot-melt adhesive compounding, ELVAX CM4875 is dry-blended with hydrocarbon or rosin ester tackifiers, paraffin or microcrystalline wax, and a hindered phenolic antioxidant before melt mixing in a sigma-blade kneader or a corotating twin-screw extruder with an L/D of 40:1. Mixing zones are typically held between 130°C and 180°C; the melt is then transferred through heated hoses to slot-die coaters, roll coaters, or spray applicators. The higher vinyl acetate content relative to low-VA extrusion grades increases specific adhesion to aluminium foil, corona-treated polyethylene terephthalate, sized paperboard, and glassine release liners. The controlled melt index determines wet-out and penetration into porous substrates. At addition levels of 25–35 wt% tackifier, melt viscosity decreases and fibre-tear adhesion improves; wax at 5–15 wt% reduces open time and accelerates set, but above 15 wt% wax cohesive strength at 60°C may decline below acceptable values. Bond performance is evaluated by T-peel adhesion using ASTM D1876-01, shear adhesion failure temperature using ASTM D4498-07, and ring-and-ball softening point using ASTM E28-18.
Production-scale bottlenecks include viscosity drift when the melt is held at 180°C under atmospheric oxygen, char accumulation on tank walls, and insufficient wet-out at application temperatures below 150°C. These failure modes are observed on continuous tank-melt adhesive lines where residence time exceeds 2 h. Nitrogen blanketing and stainless steel wetted surfaces reduce oxidation; copper and brass fittings should be avoided because they can accelerate oxidative degradation. If pellets have been stored at relative humidity above 60%, surface moisture can introduce steam and melt heterogeneity; pre-drying at 50–60°C for 2–4 h in a desiccant dryer with a dew point below −20°C is recommended before prolonged melt processing.
Vinyl acetate copolymers undergo acetic acid elimination at elevated temperatures. The reaction is autocatalytic and becomes industrially significant above 200°C; above 230°C, acetic acid evolution is rapid and can corrode downstream tooling, create voids in cast films, and shift adhesive pH. Closed-loop temperature control with alarm setpoints at 200°C is mandatory on high-temperature hot-melt lines. Acrylate copolymers such as ethylene-methyl acrylate do not release acetic acid and may be processed to higher temperatures, but they generally show lower polarity per unit comonomer and different tackifier compatibility. Compared to amorphous polyalphaolefins, EVA-based compounds provide higher room-temperature cohesive strength but narrower open time and a steeper viscosity-temperature curve.
ELVAX CM4875 is let down into candle waxes, paraffin blends, and investment casting patterns. At 2–10 wt% addition, it reduces brittleness, improves surface gloss, and increases adhesion to wick and paperboard; above 15 wt% addition, melt viscosity increases and may require reformulation of the wick stand-up additive. The polymer also functions as a carrier resin for colour masterbatch and as a modifier in polyethylene cable compounds to increase environmental stress-crack resistance and filler acceptance. In these systems, the key mixing variable is the viscosity ratio between the EVA phase and the host polyethylene phase. When the viscosity ratio exceeds 3:1, dispersion quality can decline in a single-screw extruder, and a corotating twin-screw extruder with side feeding or a pre-dispersed batch is required.
Compared with low-VA grades used in film and profile extrusion, ELVAX CM4875 has a lower crystalline modulus and greater polar fraction; compared with high-VA grades used in low-application-temperature adhesives, it has higher melt strength and better blocking resistance. Compared with ethylene-methyl acrylate and ethylene-butyl acrylate copolymers, EVA has higher hydrogen-bonding character but lower thermal stability and higher moisture sensitivity in the melt. These differences define the substitution logic in compounding plants when formulations are transferred between polymer bases.
When processing conditions exceed 230°C, the EVA backbone degrades by deacetylation and main-chain scission; the released acetic acid attacks steel and aluminium equipment and can reduce the effectiveness of acid-neutralizing additives. The practical processing window for ELVAX CM4875 therefore remains below 230°C. If an application requires sustained temperatures above this limit, a maleic anhydride-modified polyethylene or an ethylene-alkyl acrylate copolymer is frequently substituted. The selection between ELVAX CM4875 and alternative chemistries is made on the basis of adhesion to polar substrates, thermal stability, elongation at break, and final-article food-contact requirements.
When crosslinkable compounds are formulated, ELVAX CM4875 can be thickened with organic peroxides such as dicumyl peroxide; the vinyl acetate comonomer alters peroxide half-life requirements and generates acetic acid during cure. Foamed crosslinked EVA is used in shoe midsoles, seals, and cushioning. Blowing agents such as azodicarbonamide are typically added at 2–5 phr and decompose near 200–210°C, creating a narrow processing window between peroxide initiation, blowing-agent decomposition, and EVA degradation. Batch-to-batch variance in EVA molecular weight and vinyl acetate content can shift this window; published data for this specific configuration is limited, and pilot-scale cure trials are required before production scale-up.
Regulatory status for food-contact applications is formulation-dependent. Unmodified ethylene vinyl acetate copolymers are listed in FDA 21 CFR 177.1350 for food-contact articles, subject to total extractives limitations and end-use restrictions. In the European Union, ethylene-vinyl acetate copolymers are authorised under Regulation (EU) No 10/2011; vinyl acetate monomer is assigned a specific migration limit of 12 mg/kg food simulant, with the overall migration limit of 10 mg/dm² for the finished plastic article. The neat resin does not contain intentionally added phthalates or heavy metals; certification under EU RoHS 2011/65/EU is article-dependent. REACH compliance under Regulation (EC) No 1907/2006 requires confirmation that no substance of very high concern is present above 0.1% w/w in the supplied resin.
| Regulatory area | Reference | Neat resin status |
|---|---|---|
| Food contact | FDA 21 CFR 177.1350 | Listed; final article extractives apply |
| European plastics | Regulation (EU) No 10/2011 | Authorised; vinyl acetate SML 12 mg/kg |
| Heavy metals | EU RoHS 2011/65/EU | Not intentionally added; article-dependent |
| REACH SVHC | Regulation (EC) No 1907/2006 | No SVHC above 0.1% w/w |
These statements are not self-standing certificates; final compliance is the responsibility of the converter and requires testing of the finished article under its specific conditions of use.
