| HS Code | 536202 |
| Chemical Family | Ethylene Vinyl Acetate Copolymer |
| Vinyl Acetate Content | 9 wt% |
| Melt Flow Rate 190 C 2 16 Kg | 7 g/10 min |
| Density | 0.930 g/cm³ |
| Tensile Strength At Break | 12.4 MPa |
| Elongation At Break | 750% |
| Hardness | 50 Shore D |
| Vicat Softening Point | 77°C |
| Melting Point | 99°C |
| Refractive Index | 1.504 |
As an accredited ELVAX 750 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 750 Ethylene Vinyl Acetate Copolymer, supplied as free-flowing pellets in 25 kg polyethylene-lined multiwall paper bags. |
| Container Loading (20′ FCL) | 20′ FCL: 20-foot full container load of ELVAX 750 Ethylene Vinyl Acetate Copolymer, palletized and secured for safe transport. |
| Shipping | ELVAX 750 is shipped as solid pellets in multi-walled paper bags, fiber drums, or bulk hoppers. Keep dry, avoid direct sunlight, and store away from oxidizers. No hazardous cargo classification typical, but standard industrial hygiene and dust control measures apply during handling. |
| Storage | Store ELVAX 750 Ethylene Vinyl Acetate Copolymer in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep original containers tightly closed to prevent contamination and moisture pickup. Avoid generating dust and static electricity. Maintain moderate temperatures; under proper storage conditions, material remains stable for extended periods. |
| Shelf Life | Shelf life is typically two years from date of shipment when stored in original, unopened packaging under cool, dry conditions. |
ELVAX 750 is classified as an ethylene-vinyl acetate copolymer with 9 wt% vinyl acetate content and a melt flow rate of 7 g/10 min at 190 °C/2.16 kg under ASTM D1238. In case-sealing and perfect-binding hot-melt adhesives, the copolymer is introduced as the polymeric backbone at 18–32 wt%, with the remaining formulation typically consisting of hydrocarbon tackifying resin at 30–50 wt%, wax diluent at 10–25 wt%, and hindered phenol/phosphite stabilizer at 0.1–0.5 wt%. Compounding is executed on twin-screw extruders with L/D 44:1 to 52:1, barrel zones 150–180 °C, and screw speed 300–500 rpm; the blend is then melted in heated application tanks at 160–175 °C for bead or slot-die delivery. Pre-drying at 70–80 °C for 2–4 h is required when incoming moisture exceeds 0.03 wt% or relative humidity is above 60%, because residual water accelerates ester hydrolysis and viscosity drift. Production-scale records show that holding temperatures above 200 °C initiate measurable acetic acid elimination and manifold charring; therefore the high-temperature alarm boundary is set at 195 °C. Melt temperatures below 150 °C produce incomplete tackifier dispersion and poor fibre tear on kraft stock. Adhesive formulations with ELVAX 750 below 18 wt% exhibit reduced cold-flexibility and brittle bond lines, while loadings above 32 wt% elevate applicator manifold pressure and slow set speed on high-speed case erectors. Compliance for food-carton end uses rests on FDA 21 CFR 175.105 for the adhesive and FDA 21 CFR 177.1350 for the ethylene-vinyl acetate polymer, with EU REACH (EC) No 1907/2006 registration obligations. Terminal finished products include corrugated case and carton seams, folded carton side seams, bookbinding spine adhesive, paper bag bottom seams, and tray-erection bonds.
| Constituent | Function | Typical loading (wt%) | Production boundary observed |
|---|---|---|---|
| ELVAX 750 | polymer backbone | 18–32 | above 32 wt% raises manifold pressure and slows set speed |
| Hydrocarbon tackifying resin | substrate wetting | 30–50 | above 50 wt% reduces heat resistance and cohesive strength |
| Fischer-Tropsch or paraffinic wax | viscosity and open-time control | 10–25 | above 25 wt% shortens open time on high-speed lines |
| Hindered phenol/phosphite stabilizer | oxidative and thermal stabilization | 0.1–0.5 | below 0.1 wt% permits viscosity drift after 4 h at 180 °C |
In paraffinic and microcrystalline wax blends used for corrugated board coating, container lid sealing, and waxed paper interleaving, ELVAX 750 is incorporated at 2–8 wt% to reduce crystal size and raise congealing point as measured by ASTM D938. The resin is fluxed in agitated melt tanks at 120–140 °C with a turbine impeller tip speed below 3 m/s to avoid entrainment, then transferred through jacketed screens before curtain or roller coating at 110–130 °C. Published data for this specific grade in curtain-coating service is limited; the 2–8 wt% range represents established industrial use, and the upper boundary is set by viscosity rise and edge re-thread defects rather than by a universal specification. Terminal products include corrugated cases with water-resistant coated barriers, paperboard cartons, paper cups, lids, and waxed paper. Compliance for paper and paperboard food-contact components is anchored to FDA 21 CFR 176.170, with wax congealing point measured by ASTM D938 and EU REACH (EC) No 1907/2006 applying to the compounded wax blend if exported.
Extrusion coating lines running paper, foil, and oriented substrates integrate ELVAX 750 into the sealant skin at 10–30 wt% of the LDPE matrix to lower seal initiation temperature and preserve seal strength measured by ASTM F88/F88M. The polymer blend is plasticated in single-screw extruders with L/D 30:1, barrel zones 160–260 °C, and a slot die gap of 0.5–0.8 mm; the melt temperature at the die lip should remain below 290 °C, and total residence time should not exceed 5 min to limit acetate degradation. Adhesion to unprimed aluminum foil is influenced by foil surface energy; a minimum wetting tension of 38 dyn/cm is required, and corona treatment or aqueous primer is used on reverse-printed structures. Draw resonance and edge tearing occur at line speeds above 200 m/min if melt strength is insufficient; when the copolymer loading approaches 30 wt%, line tension control should be kept within ±3% to prevent web breaks. Terminal finished products include aseptic cartons, foil sachets, laminated pouch structures, paper/foil lidding, and medical packaging webs. Compliance is anchored to FDA 21 CFR 177.1350, EU Regulation (EU) No 10/2011 for plastic food-contact materials, and ASTM D1238 for incoming melt flow verification.
When ELVAX 750 is dry-blended with LLDPE at 5–15 wt% in monolayer blown-film and cast-film operations, the copolymer modifies the heat-seal initiation response of the film without requiring a separate coextruded seal layer. The blend is processed through a grooved-feed extruder with L/D 30:1 and a barrier screw at melt temperatures of 180–210 °C; in blown-film lines the frost line is maintained at 3–6 times the die diameter to control bubble stability and haze. Published data for this specific grade loading in blown-film extruders is limited; the 5–15 wt% range represents industrial practice rather than a universal specification. Terminal finished products include overwrap film, collation shrink film, agricultural film, and stretch wrap. Compliance for food-contact film rests on FDA 21 CFR 177.1350, ISO 1133-1:2022, and ASTM D1238. The process boundary is defined by thermal stability: polypropylene extrusion at temperatures above 210 °C is not recommended because the acetate segment degrades, and combinations with amine-based additives are not used because ester hydrolysis is accelerated in humid processing environments.
Masterbatch production uses ELVAX 750 as a carrier resin for pigment and additive concentrates destined for polyethylene blown film, cast film, and extrusion coating. The carrier phase loading is 60–80 wt% of the masterbatch, with final let-down ratios of 2–5 wt% in the finished polyethylene article. Melt compounding is performed on co-rotating twin-screw extruders with L/D 40:1, screw speed 400–600 rpm, and barrel zones 120–160 °C; pellets are formed after melt filtration through screens of 100–200 µm, and residual moisture is controlled to below 0.03 wt% before packaging. Terminal finished products include colour masterbatch, slip/antiblock additive masterbatch, and processing-aid masterbatch for polyethylene film applications. Compliance is anchored to ISO 1133-1:2022, ASTM D1238, and FDA 21 CFR 177.1350 where the final film may contact food. Let-down into polypropylene is not advisable due to phase incompatibility and the thermal degradation threshold of the acetate moiety.
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ELVAX 750 is a low-vinyl-acetate ethylene-vinyl acetate copolymer supplied in pellet form, with a manufacturer-nominal vinyl acetate content of 9 wt% and a melt mass-flow rate of 7 g/10 min when tested at 190 °C under a 2.16 kg load according to ISO 1133-1:2022 or ASTM D1238. The solid-state density is 0.930 g/cm³ by ISO 1183-1:2019, and the material belongs to the semi-crystalline EVA class in which polyethylene crystallinity is only partly disrupted by the acetate comonomer. This composition places ELVAX 750 between high-stiffness low-comonomer plastomers and the high-tack, flexible EVA grades containing 18–32 wt% vinyl acetate. It is used as a base resin or rheology modifier in hot-melt adhesives, wax-based compounds, and polyolefin modification, and as a component in sealant and coating formulations where low acetate polarity is required for hydrocarbon wax compatibility.
The morphological consequence of the 9 wt% vinyl acetate distribution is retention of long crystallizable ethylene sequences. In differential scanning calorimetry performed under ASTM D3418, a melting peak is observed in the 95–100 °C range; published data for this specific grade's exact peak and enthalpy may vary with heating rate and thermal history. The higher crystalline fraction relative to 18 wt% VA EVA raises the Vicat softening temperature and reduces the tendency for room-temperature surface tack. Peel adhesion to polar substrates is therefore lower than for ELVAX 450 or ELVAX 250; adhesion to nonpolar polyethylene and polypropylene substrates is retained because interfacial diffusion is governed more by the ethylene backbone and less by the acetate group concentration. Tensile and elongation data generated under ASTM D638 or ISO 527-2:2012 should be obtained on the final formulated compound rather than on the neat pellet, because the semicrystalline morphology is modified by tackifier, wax, and processing thermal history.
Hot-melt adhesive mixing in a 100 L horizontal sigma-blade mixer with thermal-oil heating at 170–180 °C begins with the wax and antioxidant phase. ELVAX 750 is added after the wax melts; the torque profile shows a sharp initial rise that decays as the pellets fuse. Compared with ELVAX 760 at 2 g/10 min, the 7 g/10 min melt index reduces peak torque and allows higher solids loading before the motor reaches its rated amperage. Viscosity of the finished compound is checked by ASTM D3236 at 180 °C using a Brookfield Thermosel system; for a typical 30 wt% ELVAX 750 / 40 wt% hydrocarbon tackifier / 30 wt% paraffin wax formulation, viscosity in the 1,000–5,000 mPa·s range is common, but specific viscosity depends on tackifier softening point and wax molecular weight. Published data for this exact blend ratio is limited; the stated viscosity window is based on general EVA hot-melt compounding practice under ASTM D3236 and must be verified for each tackifier lot. Filtration through a 200 µm screen is recommended; a filter pressure increase above 0.3 MPa over an 8 h shift indicates dispersion breakdown, crosslinked gel, or char formation from wall contact.
During long residence or high-shear processing, ethylene-vinyl acetate copolymers can undergo deacetylation, liberating acetic acid and generating unsaturation in the backbone. For ELVAX 750, melt temperatures above 230 °C should be avoided in production to limit this reaction; the rate accelerates with localized shear heating in kneading sections. Published kinetic data for this exact grade under twin-screw conditions is limited, but EVA degradation studies indicate that ester thermolysis is measurable above 220–250 °C and becomes rapid above 300 °C under inert conditions. Vacuum venting at −0.08 MPa gauge after the plastication zone removes acetic acid and low-molecular-weight products. The vent port must be maintained because condensed acetic acid corrodes carbon steel; stainless steel or nickel-plated internal surfaces are specified for extended campaigns. Residual moisture in pellets should be below 0.05 wt% before extrusion or hot-melt mixing; when ambient relative humidity exceeds 60%, a desiccant dryer set at 60 °C for 4 h reduces surface moisture and prevents steam-induced bubbles in the melt.
Wax compatibility is a defining usage difference between ELVAX 750 and higher-VA grades. In paraffin wax blends, the 9 wt% VA content permits homogeneous single-phase melts above 120 °C, while 18–28 wt% VA EVA grades may require microcrystalline wax or polar tackifier to prevent phase separation. Cloud point testing under ASTM D2500 or hot-stage microscopy is used to quantify wax compatibility; a lower-cloud-point blend indicates better compatibility and reduced viscosity hysteresis during cooling. This behavior supports use in paper saturating compounds, corrugated board coatings, and mould release waxes where high-VA EVA would provide excessive tack and block resistance failures.
Polyolefin compounding uses ELVAX 750 as an impact modifier and processing aid at addition levels of 2–10 wt% in polyethylene or polypropylene systems. The low vinyl acetate content minimizes gross phase separation while the melt flow index of 7 g/10 min is close enough to many polyethylenes to allow distributive mixing without excessive viscosity mismatch. In a 40:1 L/D co-rotating twin-screw extruder with a barrel profile of 150–200 °C, the grade disperses without requiring wetting agent; impact improvement is measured by ISO 179-1:2023 Charpy notched tests or ASTM D256 Izod tests. Addition above 15 wt% typically reduces tensile modulus, and the compound moves toward flexible EVA blend territory; the exact transition depends on the host polyolefin and the crystalline compatibility of the two ethylene-rich phases. Published data for specific polyolefin/ELVAX 750 blend ratios is limited; laboratory screening on the intended production twin-screw configuration is required.
| Grade | Nominal vinyl acetate content (wt%) | Nominal melt mass-flow rate (g/10 min) | Density (g/cm³) | Test method for flow |
|---|---|---|---|---|
| ELVAX 750 | 9 | 7 | 0.930 | ISO 1133-1:2022 |
| ELVAX 760 | 9 | 2 | 0.930 | ISO 1133-1:2022 |
| ELVAX 650Q | 12 | 8 | 0.933 | ISO 1133-1:2022 |
| ELVAX 450 | 18 | 8 | 0.941 | ISO 1133-1:2022 |
| ELVAX 250 | 28 | 25 | 0.951 | ISO 1133-1:2022 |
The tabulated values are nominal comparison values reported in publicly available manufacturer grade data; lot-specific values may differ. The property difference relevant to selection is that equal melt-index grades at higher VA content provide greater polarity, lower crystallinity, and lower heat resistance, while ELVAX 750 retains more polyethylene-like stiffness and wax compatibility. Capillary rheometry under ISO 11443:2021 at 190 °C is used to measure shear viscosity; EVA materials with 9 wt% VA and 7 g/10 min melt index exhibit shear-thinning behavior typical of branched ethylene copolymers. At apparent shear rates between 100 s⁻¹ and 1,000 s⁻¹, viscosity falls by roughly one order of magnitude compared with zero-shear conditions; melt fracture may occur above critical wall shear stress. Published data for ELVAX 750's specific capillary curve is limited; extrusion coating lines use die-lip temperature and land-length adjustment to control surface melt fracture.
Incoming quality control should include ISO 1133-1:2022 melt flow and ISO 1183-1:2019 density. When switching from a previous lot, hot-melt compounders should monitor motor torque and final ASTM D3236 viscosity because a melt flow shift of only 1 g/10 min at the resin level can move final blend viscosity by 10–20%. Published data for this grade's lot-to-lot variance is limited; however, typical EVA production lots have melt-flow certificates with tolerance ranges stated by the manufacturer. Incoming resin stored in rail cars or silos may stratify by pellet size; sampling from multiple locations in the hopper is required for representative QC.
| Standard or regulation | Relevant designation | Application criterion |
|---|---|---|
| FDA food-contact | 21 CFR 177.1350 | Ethylene-vinyl acetate copolymers; final article must meet extraction limitations under 21 CFR 176.170(c) if used in contact with aqueous or fatty foods. |
| REACH | EC 1907/2006 | Grade-specific monomer and additive registration; SVHC content must be confirmed by supplier documentation. |
| RoHS | 2011/65/EU | Expected compliance for unfilled natural resin; pigmented or flame-retardant compounds require separate verification. |
| Melt flow | ISO 1133-1:2022 | Procedure A; 190 °C; 2.16 kg; 7 g/10 min nominal. |
| Density | ISO 1183-1:2019 | Immersion method or gas pycnometer; 0.930 g/cm³ nominal. |
Solvent-borne laminating adhesives and sealants using ELVAX 750 as a film former are prepared at 10–20 wt% solids in toluene or methylcyclohexane. The low VA content reduces solution viscosity at equivalent molecular weight compared with high-VA EVA, allowing higher solids at application viscosity. Solution viscosity is measured by ASTM D2196 Brookfield methods at 25 °C; resin dissolution requires high-shear dispersion with a Cowles blade tip speed above 10 m/s to avoid gel-like fragments remaining in the lacquer. Published data for this exact solvent-borne formulation is limited; solvent selection must account for EVA solubility parameters and local emission limits.
Extrusion coating and laminating trials using ELVAX 750 in a 90 mm single-screw extruder with a 30:1 L/D barrier screw and flat die at 190–210 °C demonstrate that the 9 wt% VA grade can be drawn at line speeds typical of low-acetate EVA sealant layers; published data for this specific grade's neck-in and draw-down on commercial coating lines is limited. The lower acetate content reduces adhesion to aluminium foil and oriented polyester film relative to 18 wt% VA EVA, so corona treatment or a tie-layer is required for lamination bonding above 0.5 N/15 mm adhesive strength as measured by ASTM F88 on the final laminate. The low VA content also reduces seal initiation temperature in multilayer structures compared with unmodified polyethylene, but not to the level achieved by higher VA grades. Storage in closed original packaging at ambient temperature below 35 °C with UV protection retains melt-flow stability for 24 months; material that has been rewound or conveyed through hot-air dryers should be re-tested for melt flow and moisture prior to use.
