| HS Code | 308405 |
| Vinyl Acetate Content | 9.5 wt% |
| Melt Flow Index | 30 g/10 min (190°C/2.16 kg) |
| Density | 0.936 g/cm³ |
| Melting Point | 106 °C |
| Vicat Softening Point | 74 °C |
| Tensile Strength At Break | 17 MPa |
| Elongation At Break | 700% |
| Flexural Modulus | 58 MPa |
| Brittleness Temperature | -100 °C |
As an accredited ELVAX 760 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVAX 760 ethylene vinyl acetate copolymer is supplied as pellets in 25 kg multi-wall paper bags for safe handling. |
| Container Loading (20′ FCL) | 20′ FCL: ELVAX 760 EVA copolymer, 25kg bags on pallets, securely loaded and ventilated for safe transport. |
| Shipping | ELVAX 760 is supplied as solid pellets in multi-layer bags. Shipment is non-hazardous under normal transport conditions, though avoid excessive heat, moisture, and direct sunlight. Keep cargo dry and well-ventilated. No special hazard labeling required if transported below melting temperature, but standard handling, securing, and contamination prevention measures apply. |
| Storage | Store ELVAX 760 Ethylene Vinyl Acetate Copolymer in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and open flames. Keep original containers tightly sealed to prevent moisture absorption and contamination. Avoid contact with strong oxidizers. Proper storage ensures stability and maintains processing performance. Use within a reasonable timeframe under recommended conditions. |
| Shelf Life | Shelf life is typically 2–3 years when stored in original, unopened containers away from heat, moisture, and direct sunlight. |
In three-layer coextruded blown-film lines running a sealant web of ELVAX 760, the copolymer’s vinyl acetate content of 9.3 wt%, density of 0.930 g/cm³ (ASTM D1505), and melt index of 2.0 g/10 min (ASTM D1238 / ISO 1133-1:2022, 190 °C/2.16 kg) place the melt within a viscosity region that supports finite bubble stability at die gaps between 0.8 mm and 2.0 mm. The sealant layer is formulated either neat or as a 20–40 wt% ELVAX 760 blend with LDPE/LLDPE; addition below 20 wt% reduces the seal-initiation contribution to the point where the web reverts to polyethylene-like seal behaviour, while loadings above 40 wt% can lower stiffness sufficiently to affect web handling on high-speed pouch converters. In this structure the sealant web thickness is maintained between 5 µm and 15 µm, and the layer is let down with 0.05–0.20 wt% of a migratory slip concentrate and 0.1–0.5 wt% of synthetic silica antiblock to control blocking on rewind. Production-scale runs on three-layer blown-film equipment using a 30:1 L/D extruder with a 45–65 mm screw diameter typically set barrel temperatures from 150 °C in the feed section to 190 °C at the metering zone, with die zones held at 190–220 °C; melt temperatures above 260 °C should be avoided because deacetylation releases acetic acid, which can corrode downstream winders and generate pinhole defects in the web. The food-contact status of the sealant layer is governed by FDA 21 CFR 177.1350 and Commission Regulation (EU) No 10/2011, with overall migration below 10 mg/dm² under the intended contact conditions; REACH compliance is documented under EC No 1907/2006. Seal strength and hot-tack performance are measured on converted pouches according to ASTM F88 and ASTM F1921, and the resulting terminal product classes include frozen-food pouches, sauce sachets, and non-aseptic liquid packaging with polyolefin-based multi-layer structures.
ELVAX 760 is applied on extrusion-coating lines with a 90–150 mm single-screw extruder and 30:1 L/D at coating weights of 10–25 g/m² as a heat-seal tie or barrier-adhesion layer on foil and paperboard. The melt is processed at 232–260 °C through a slot die with a die gap of 0.5–0.8 mm and an air gap of 100–250 mm; a chill-roll temperature of 15–25 °C is fixed to quench the web and to limit post-extrusion crystallinity. Neck-in on production-scale lines is controlled by adjusting the deckle from 20–40 mm inside the substrate edge, by limiting draw ratio to 2:1–4:1, and by raising melt temperature in 5 °C increments if draw resonance appears. Adhesion to aluminium foil typically requires in-line corona discharge at 2–4 kW or a polyethyleneimine primer at 0.01–0.05 g/m² dry coating; without surface activation, peel strength on foil can fall below the 2 N/15 mm threshold needed for lidding applications. Formulation for the coating includes 10–20 wt% LDPE to modify melt extensibility and to reduce edge waste, with ELVAX 760 constituting 80–90 wt% of the applied layer; a small addition of 0.02–0.05 wt% antioxidant can be used where long residence times at high temperature are expected. The compliance matrix for this converted-structure application appears in the table below, and terminal product types include aseptic beverage cartons, foil lidding membranes for dairy cups, and microwaveable susceptor laminates for bakery snacks. A process boundary is that melt temperatures above 260 °C initiate deacetylation; at this point the web develops a vinegar-like odour, and the resulting acetic acid can attack chill-roll surfaces and downstream slitter blades.
| Regulatory reference | Specific provision | Boundary for ELVAX 760 layer |
|---|---|---|
| FDA 21 CFR 177.1350 | Ethylene-vinyl acetate copolymers for food contact | VA content ≤ 40 wt%; extraction limits per regulation |
| FDA 21 CFR 176.170 | Components of paper and paperboard in contact with aqueous and fatty food | EVA coating applied to compliant paperboard substrate |
| EU 10/2011 | Plastic materials for food contact | Overall migration below 10 mg/dm² for CE-marked food-contact articles |
| REACH EC No 1907/2006 | Registration, SVHC notification | SVHC content <0.1 wt% in final article |
Compounding 5–20 wt% ELVAX 760 into high-density polyethylene on a corotating twin-screw extruder with 40:1 L/D is used to modify the environmental stress-cracking resistance of injection-moulded crates and cold-chain containers. The blend is prepared with barrel temperatures between 180 °C and 230 °C, a screw speed of 300–600 min−1, and a specific energy input below 0.25 kWh/kg to avoid local overheating; the EVA phase distributes in discontinuous domains when cooled at moderate rates. At the lower end of the loading window, 5 wt% is used to improve notched Izod impact retention at −20 °C by approximately 20–40% over unmodified HDPE in published low-VA EVA compounding studies, while loadings toward 20 wt% are selected for deep-freeze service where slow crack growth is the primary failure mode. For polypropylene-based compounds, the preferred loading is 5–10 wt%; above that level the difference in crystallisation temperature between the phases can reduce weld-line strength measured on dual-gate specimens under ASTM D638-14. The downstream production line is injection moulding with clamp force settings from 3,000 kN to 12,000 kN, mould temperatures of 10–40 °C, and back pressure not exceeding 0.8 MPa to prevent screw slippage. Testing of the moulded parts follows ASTM D638-14 for tensile properties, ASTM D256-10 for notched Izod, and ASTM D1693 for environmental stress-cracking resistance under 10% Igepal CO-630; REACH and RoHS declarations are required for export to EU markets. Terminal product classes include stackable distribution crates, cold-chain fish totes, and industrial tote bins with wall-stiffening ribs. Published data specific to ELVAX 760 at all formulation levels is limited; therefore, trade formulation trials on the actual mould geometry remain necessary before tooling is released for mass production.
Halogen-free wire and cable formulations that incorporate ELVAX 760 at 10–30 wt% in an LLDPE base are processed on crosshead extrusion lines with screw diameters of 45–90 mm and 24:1–30:1 L/D, using melt temperatures from 160 °C to 200 °C to avoid premature peroxide decomposition where crosslinking is not intended. The VA term at 9.3 wt% changes the dissipation factor in a range measurable by ASTM D150 at 1 kHz; the low melt index of 2.0 g/10 min supports the draw-down required for thin-wall insulation on copper conductors from 0.5 mm to 2.5 mm core diameter. In filled sheathing compounds, the addition ratio of ELVAX 760 is kept at 10–15 wt% when the aluminium trihydroxide loading reaches 60–65 wt%; above 15 wt% EVA, the compound viscosity at low shear can drop below the level required for pressure extrusion of flame-retardant jackets. The downstream production sequence is cable extrusion on a single-screw extruder with a pressure-regulation crosshead, followed by water trough cooling with a temperature gradient from 80 °C to 20 °C to control jacket shrinkback. Compliance for low-voltage appliance wiring and automotive single-core cables includes IEC 60332-1-2 for flame spread, UL 1581 for physical properties of thermoplastic insulation, REACH EC No 1907/2006, and RoHS 2011/65/EU; for EU construction-product cables, EN 50575 requires declaration of performance under the CPR. Terminal product types comprise low-voltage appliance wires, automotive primary wires, and halogen-free sheathing layers for data and control cables. The operational boundary is the deacetylation ceiling at 260 °C; barrel residence times above 20 min at 230 °C or above should be avoided because acetic acid generation accelerates when the melt index begins to drift upward.
During vacuum calibration of flexible profiles made from ELVAX 760 either neat or at 30–70 wt% in LLDPE, the high melt elasticity of the 2.0 g/10 min melt index raises die swell but permits thin wall sections to retain shape after vacuum calibration; the EVA phase forms the continuous matrix above 50 wt% for high-flexibility profiles. The formulation is let down with 0.05–0.15 wt% of a fluoropolymer processing aid where sharkskin appears at shear rates above 500 s−1, and with 0.1–0.3 wt% of an antioxidant for long-run profile extrusion; LDPE-based color concentrates are added at 2–4 wt%. Barrel temperatures in a 45–65 mm single-screw extruder with 24:1 L/D are set at 150–180 °C, while the die and calibrator are maintained at 180–200 °C; vacuum calibration pressure between 0.02 MPa and 0.06 MPa is applied to hold tube ovality below 0.1 mm at line speeds of 10–40 m/min. For flexible industrial tubing, the final wall thickness is typically 0.5–3.0 mm, and the terminal products include pneumatic tubes, wire spiral hose covers, bumper edge profiles, and weatherseals for agricultural equipment cabins. Compliance for non-food industrial profiles is based on REACH EC No 1907/2006 and RoHS 2011/65/EU; where the extrudate is used in electrical-equipment contact, the compound is tested against UL 94 HB or IEC 60695-11-10 for horizontal burn. A processing constraint at the die lip is that moisture absorption from high-humidity storage can produce surface splay and longitudinal microgrooves; if storage above 70% relative humidity is unavoidable, pre-drying at 60 °C for 2 h in a desiccant hopper eliminates the defect without changing the melt index.
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ELVAX 760 ethylene vinyl acetate copolymer is a low-vinyl-acetate copolymer supplied as solid pellets. The copolymer contains 9.3% by weight vinyl acetate monomer units, with the balance ethylene. This composition retains strong polyethylene-like crystallinity while the acetate side groups disrupt chain packing sufficiently to reduce flexural stiffness and to broaden heat-seal response compared with unmodified low-density polyethylene. Melt flow rate is specified at 2.0 g/10 min under ASTM D1238 conditions of 190 °C and a 2.16 kg piston load. Density is specified at 0.93 g/cm³ under ASTM D1505. Typical Vicat softening point is published at 82 °C under ASTM D1525. The low melt flow rate indicates a high-molecular-weight grade with higher melt strength and higher extensional viscosity than high-MFR EVA copolymers. These properties are used in hot-melt adhesive compounding, paraffin wax modification, sealant layers, and polymer modification. The material is differentiated from high-vinyl-acetate grades such as 28% VA copolymers by higher crystallinity, higher Vicat softening point, lower polarity, and reduced solubility in polar tackifiers. It is differentiated from LLDPE by the presence of acetate functionality, which improves adhesion to polar substrates and provides some heat-seal latitude. Processing above 230 °C is not recommended because deacetylation of vinyl acetate units can release acetic acid and induce corrosion in downstream equipment.
The principal constraint in high-shear compounding is thermal stability of the acetate group. At melt temperatures above 230 °C, or at lower temperatures with extended residence time, vinyl acetate units undergo eliminative deacetylation; the liberated acetic acid accelerates chain degradation and attacks carbon steel and copper alloys. In production-scale twin-screw extrusion, barrel zones are therefore set to 150–180 °C, with die temperature held at 190 °C. A co-rotating twin-screw extruder with 44:1 L/D, atmospheric venting, and a vacuum of -0.08 MPa at the final vent port is used to remove residual moisture and low-molecular-weight volatiles. Torque limits are governed by the melt flow rate; because ELVAX 760 is a 2.0 g/10 min grade, screw torque at 180 °C is significantly higher than that of a 25 g/10 min high-VA adhesive grade at the same throughput. Operators monitor specific mechanical energy and barrel pressure because localized viscous heating can raise temperature above the deacetylation threshold even when set-points remain within range. For formulations containing tackifiers and paraffin wax, pre-blending in a sigma-blade mixer below 120 °C is typical before melt compounding. Nitrogen blanketing of the feed hopper is used when ambient relative humidity exceeds 60%. Avoid combination with amine-based additives in high-temperature compounding; residual acetic acid can react with amines to form amides and water, causing viscosity drift, foaming, and premature color development.
In hot-melt adhesive formulations containing rosin ester tackifiers, cloud-point measurements at 180 °C are used to detect incompatibility. ELVAX 760 at 9.3% VA typically requires more hydrocarbon-modified tackifier than high-VA grades because its solubility parameter is closer to polyethylene. A starting formulation of 30 wt% ELVAX 760, 35 wt% hydrocarbon tackifier, and 35 wt% paraffin wax is mixed in a heated planetary mixer at 160–180 °C under nitrogen. Open time and set time are measured with a rheometer at 30 °C; higher crystallinity shortens set time compared with 28% VA EVA. Peel adhesion on aluminum is measured according to ASTM D1876; failure mode shifts from cohesive to adhesive when tackifier loading is too low. Because low-VA EVA produces a stiffer adhesive film, low-temperature flexibility is sacrificed. This grade is therefore selected when short set time and elevated-temperature resistance outweigh low-temperature ductility.
When ELVAX 760 is coextruded as a sealant layer on oriented polypropylene or polyester films, the low vinyl acetate content drives heat-seal initiation to a higher temperature than 18% or 28% VA sealant grades. Published low-VA EVA sealant formulations typically initiate acceptable seal strength above 90 °C, while higher-VA copolymers can initiate below 80 °C. The exact seal-initiation temperature depends on substrate, coat weight, dwell time, and seal-bar pressure; published data for this specific configuration is limited. Seal strength is measured according to ASTM F88/F88M after a flat-jaw seal at defined temperature, pressure, and dwell. The 2.0 g/10 min melt flow rate provides high melt strength in the coextrusion die, permitting stable curtain or blown-film geometry without melt resonance. Single-screw extruders with 25:1 L/D and a barrier screw are typically used for sealant layers; melt temperature is maintained at 190–210 °C. Screen packs of 40/80/120 mesh remove gels. The acetate group increases adhesion to foil and polyester compared with LLDPE, but the low acetate content limits adhesion to highly polar substrates such as nylon and aluminum under wet conditions. Film haze is controlled by rapid quenching; high crystallinity in the low-VA grade can otherwise produce spherulitic scattering. Unlike high-VA EVA, ELVAX 760 does not require high levels of antiblock masterbatch because its surface is less tacky; however, blocking can still occur on rewind if winding tension exceeds 150 N/m on thin-gauge film.
In paraffin wax modification, ELVAX 760 is added at 2–5 wt% to increase melt viscosity, improve flexibility, and raise the tensile strength of wax-based coatings and candles. The low vinyl acetate content gives strong compatibility with paraffinic and microcrystalline waxes; phase separation is less likely than with 18% or 28% vinyl acetate copolymers at the same addition level. However, the low MFR of 2.0 g/10 min produces a much larger viscosity build than a 25–40 g/10 min EVA at equivalent concentration. In a 3 wt% blend with fully refined paraffin wax, Brookfield viscosity at 120 °C can increase by a factor of 3–10 depending on wax molecular weight; exact values should be measured with ASTM D3236 using a Thermosel spindle because published data for this specific wax type is limited. If viscosity must remain below 100 mPa·s at 120 °C, the formulator either reduces ELVAX 760 concentration to 1–2 wt% or blends it with a higher-MFR grade such as an 18% VA EVA. High-shear mixing with a sawtooth impeller at 500–1000 rpm is used until a clear melt is obtained; incomplete dispersion of the high-molecular-weight copolymer can leave visible gel particles. Cooling rate affects crystalline network formation: fast cooling produces small wax crystals and lower opacity, while slow cooling below 1 °C/min can allow EVA-rich domains to co-crystallize with wax and reduce flexibility. Unlike oxidized polyethylene waxes, ELVAX 760 does not contain acid functionality, so adhesion to polar metals in wax coatings is lower; coupling agents or polar co-additives may be required.
Typical published values from the manufacturer technical data sheet are listed below. These values are typical and are not specification limits.
| Property | Test method | Typical value | Unit |
|---|---|---|---|
| Vinyl acetate content | Manufacturer analytical method | 9.3 | wt% |
| Melt flow rate | ASTM D1238, 190 °C, 2.16 kg | 2.0 | g/10 min |
| Density | ASTM D1505 | 0.93 | g/cm³ |
| Vicat softening point | ASTM D1525 | 82 | °C |
Thermogravimetric analysis of ethylene vinyl acetate copolymers in nitrogen shows a two-step mass-loss profile; the first mass loss between 300 °C and 400 °C is assigned to deacetylation, and the second above 450 °C to main-chain scission. The activation energy for deacetylation is reported in peer-reviewed polymer literature in the range of 150–200 kJ/mol, depending on acetate content and atmosphere. In extrusion, the practical risk is not bulk degradation temperature but local viscous heating; melt temperature is measured with an infrared probe at the die exit and maintained below 210 °C. If acetic acid is detected by a pH probe in the vacuum-vent condensate, screw speed is reduced by 10–20% or barrel temperatures are lowered in the compression zone. Stainless steel contact surfaces are preferred over carbon steel. The vent port must be kept open and vacuum-tight; plugging from low-molecular-weight wax or tackifier condensation is a common production-scale failure mode. A vacuum level below -0.08 MPa at the vent is maintained; loss of vacuum correlates with pellet porosity and moisture entrapment. The same deacetylation chemistry separates ELVAX 760 from non-polar LLDPE: the acetate group provides functionality but requires thermal discipline.
Regulatory assessments are end-use dependent. The matrix below lists applicable frameworks; inclusion does not establish automatic compliance for every formulation.
| Framework | Scope and test designation |
|---|---|
| REACH (EC) No 1907/2006 | Registration obligations for polymer and monomer; vinyl acetate monomer is registered. |
| RoHS Directive 2011/65/EU | Lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE are not intentionally added; verify by IEC 62321. |
| FDA 21 CFR 177.1350 | Ethylene-vinyl acetate copolymers may be used in food-contact articles subject to extractives and end-use limits. |
| EU Regulation (EU) No 10/2011 | Compliance depends on overall migration limit and specific migration of vinyl acetate; not all formulations are covered for all food simulants. |
ELVAX 760 is let down into polyolefin compounds at 2–10 wt% to improve environmental stress-crack resistance and filler compatibility. In injection molding, the low vinyl acetate content preserves stiffness better than high-VA grades. A 30 mm reciprocating screw with a general-purpose polyolefin check ring is acceptable; melt temperature is set at 200–220 °C to avoid short shots in thin-wall tools. Clamp force settings of 6–8 kN/cm² projected area are typical for high-flow polyolefins, but the 2.0 g/10 min MFR may require higher melt temperature. Differences from metallocene-catalyzed plastomers are significant: ELVAX 760 has broader molecular weight distribution and higher crystallinity, so it provides less impact modification per unit addition but better retention of heat resistance. The acetate content allows some interaction with fillers, whereas nonpolar LLDPE does not. In wire-and-cable compounds, ELVAX 760 can increase filler loading capacity; however, low-VA grades are less flame-retardant-compatible than high-VA grades because char formation is lower.
ELVAX 760 is compared with ethylene butyl acrylate and ethylene methyl acrylate copolymers when low-temperature flexibility is required. ELVAX 760, with 9.3% VA, has higher crystallinity and lower low-temperature impact performance than acrylate copolymers; however, it provides better thermal stability in non-acidic environments and lower surface tack. In solvent-based adhesive systems, ELVAX 760 dissolves in toluene or xylene at 50–70 °C; aliphatic solvents require higher temperature. Toluene solutions at 15 wt% solids typically require mixing at 50–70 °C. Kinematic viscosity can be measured with ASTM D445 or ASTM D789, but published data for this specific grade and solvent is limited. Compared with high-VA EVA, ELVAX 760 produces a harder, more crystalline film and exhibits lower tackifier compatibility; it is therefore chosen when the final article must resist blocking and retain dimensional stability.
Because the copolymer is hygroscopic only to a limited extent, drying is generally not required if packaging remains sealed and storage is below 40 °C. If pellets are exposed to relative humidity above 60% for more than 24 h, pre-drying at 60–70 °C for 4 h in a desiccant dryer is used before extrusion. Pellets should be conveyed with clean dry air to avoid fines accumulation. In solvent-based adhesive systems, solids above 15 wt% can become difficult to stir with low-torque agitators. The material is not recommended for service environments containing strong acids, strong bases, or oxidizing agents at elevated temperature because residual ester groups undergo hydrolysis or oxidation.
