| HS Code | 813453 |
| Melt Index 190 C 2 16 Kg | 2 g/10min |
| Vinyl Acetate Content | 2.5% |
| Density | 0.927 g/cm³ |
| Melting Point Dsc | 106 °C |
| Vicat Softening Point | 83 °C |
| Tensile Strength At Break | 18 MPa |
| Elongation At Break | 650% |
| Secant Modulus | 127 MPa |
| Shore Hardness D | 44 |
| Haze | 4% |
| Gloss | 80 |
| Clarity | High |
As an accredited Elevate EF437 EVA Copolymer Resin,2.5% VA,2 MI,High Clarity Packaging Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as 25 kg polyethylene bags, free-flowing pellets, sealed, labeled, palletized and stretch-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20' FCL loading: Elevate EF437 EVA resin in 25kg bags, palletized, shrink-wrapped, 20 pallets per container, approximately 20 metric tons. |
| Shipping | Elevate EF437 EVA Copolymer Resin ships as solid pellets in 25 kg moisture-protective bags, bulk boxes, or railcars. Non-hazardous per DOT/IMDG. Store in a cool, dry area away from heat and ignition sources. Avoid dust accumulation; keep packaging sealed to prevent contamination and moisture pickup during transit. |
| Storage | Store Elevate EF437 EVA Copolymer Resin in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition hazards. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid dust accumulation and static discharge. Use proper grounding when handling. Not subject to dangerous storage conditions, but maintain below recommended temperature for optimum clarity. |
| Shelf Life | Elevate EF437 EVA resin has a shelf life of at least one year when stored sealed, dry, and away from heat or direct sunlight. |
Specification sheets for Elevate EF437 are reviewed most frequently for three-layer blown film sealant webs in frozen food packaging. The resin carries a nominal 2.5 wt% vinyl acetate content and a melt flow index of 2 g/10 min measured under ISO 1133-1:2022 at 190 °C with a 2.16 kg load. In IQF vegetable, frozen poultry, and ice cream pouch structures, EF437 is dry-blended with a linear-low-density polyethylene carrier at 15 wt% to 30 wt% and fed to the inner sealant-layer extruder of a coextrusion die with a 1.8–2.4 mm die gap. The primary compliance standard for this food-contact use is FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers, supplemented by Regulation (EU) No 10/2011 as amended, which applies an overall migration limit of 10 mg/dm² for the finished plastic layer. Process conditions on production lines equipped with 55 mm grooved-feed single-screw extruders at L/D 30:1 are maintained at 180–215 °C melt temperature to stay below the deacetylation threshold of approximately 260 °C. Blow-up ratio is held within 2.0:1 to 2.5:1; above 2.5:1, narrow molecular weight distribution blends show haze bands and loss of machine-direction tear resistance measured by ASTM D1922-15. Frost line height is set at 5 to 8 die diameters to stabilize the bubble during high-throughput winding. At 30 wt% addition, bubble stability remains acceptable but torque drops, requiring screw speed adjustment to maintain die pressure; at 15 wt% addition, seal initiation temperature is higher and the hot-tack window narrows on vertical form-fill-seal lines. Terminal products are IQF vegetable bags, frozen poultry overwrap, and ice cream pouches. Heat seal performance is qualified by ASTM F88/F88M-23 seal strength curves and ASTM F2029-16 hot-tack measurements. If storage humidity exceeds 60% RH, the resin should be pre-dried at 60–70 °C for 2–4 hours in a desiccant dryer to prevent surface moisture from generating gel defects. Published data for this specific configuration is limited; each lot must be tested on the target coextrusion die geometry.
Film samples chilled against a polished roll at 15–25 °C show lower haze because the 2.5% VA comonomer disrupts crystalline ordering more effectively than LDPE homopolymer while retaining sufficient stiffness for bag opening. In cast film for bakery and produce applications, 5–15 wt% Elevate EF437 is added to LDPE or LLDPE. The relevant food-contact standard is FDA 21 CFR 177.1350; the EU framework remains Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm². Production uses a slot die with a 0.5–1.0 mm gap and a chill roll polished to <0.05 µm Ra. Melt temperature at the die is kept at 215–245 °C; die lip temperature uniformity of ±3 °C is required to prevent low-viscosity streak lines from the EVA-rich phase. Terminal product types include counter-top bakery bags, perforated produce film, and printed laminated film for snack packaging. Haze is measured per ASTM D1003-21; a 10 wt% addition in LDPE cast film commonly reduces haze from the 5–7% range to 2–4% on a 50 µm film, but the exact value for EF437 depends on chill roll finish and winding tension. Dart impact increases, measured by ASTM D1709-16a, but tear resistance in the machine direction measured by ASTM D1922-15 may decrease when EVA addition exceeds 15 wt% because the comonomer lowers melt strength and promotes unbalanced orientation.
| Downstream circuit | Primary U.S. standard | Primary EU/ISO standard | Terminal product classes |
|---|---|---|---|
| Frozen food three-layer blown film | FDA 21 CFR 177.1350; ASTM F88/F88M-23 | Regulation (EU) No 10/2011, OML 10 mg/dm² | IQF vegetable pouches, frozen poultry bags, ice cream overwrap |
| Cast film for bakery and produce | FDA 21 CFR 177.1350; ASTM D1003-21 | Regulation (EU) No 10/2011, OML 10 mg/dm² | Bakery film, produce bags, printed laminates |
| Extrusion coating for paperboard | FDA 21 CFR 176.170; FDA 21 CFR 177.1350 | Regulation (EU) No 10/2011, OML 10 mg/dm² | Gable-top cartons, spiral-wound containers, ingredient sachets |
| Shrink collation film | FDA 21 CFR 177.1350 | ISO 14616:1997 | Bottle multipacks, tamper-evident sleeves, frozen turkey overwrap |
| Injection molded lids | FDA 21 CFR 177.1350; ASTM D256-10(2018) | Regulation (EU) No 10/2011, OML 10 mg/dm² | Dairy cup lids, closures, dosing cups |
| Medical sterile barrier packaging | ISO 11607-1:2019; ASTM F88/F88M-23 | ISO 10993-5:2009; ISO 11135:2014 | Chevron pouches, header bags, IV kit overwrap |
Coating lines producing liquid packaging cartons run at die temperatures of 220–260 °C; the low-VA EVA sealant layer is coextruded or monolayer coated onto paperboard at thicknesses of 15–25 µm. In this application, 15–30 wt% EF437 is blended into LDPE for the sealant layer. The food-contact architecture invokes FDA 21 CFR 176.170 for paper and paperboard in contact with aqueous and fatty foods and FDA 21 CFR 177.1350 for the EVA polymer; EU compliance is under Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm². On tandem extrusion coating lines, the die gap is 0.4–0.8 mm and die-to-nip distance is maintained below 150 mm to control neck-in below 35 mm at line speeds above 300 m/min. The critical thermal boundary is 260 °C; above this threshold, the acetoxy side groups undergo deacetylation, releasing acetic acid, which corrodes die lips, shifts pH in the cooling water, and reduces adhesion to aluminum foil. Therefore melt temperature is capped at 260 °C, and residence time in the extruder is kept below 10 minutes to limit degradation. Seal initiation temperature of the coated substrate is typically 85–95 °C, measured by ASTM F88/F88M-23. Terminal products are gable-top cartons, spiral-wound containers with induction-sealed foil membranes, and dry-ingredient sachets. The chill roll is run at 10–20 °C; higher chill roll temperatures reduce gloss and increase blocking in reel form, while lower temperatures may cause brittleness at the paperboard interface.
Shrink film for bottle multipack collation uses 10–25 wt% Elevate EF437 in an LDPE/LLDPE base to lower orientation stress and widen seal temperature latitude. The industry compliance standard for food-contact collation film is FDA 21 CFR 177.1350; free shrink and shrink tension are tested per ISO 14616:1997. A double-bubble line is used: the primary bubble is extruded at 180–210 °C and quenched in water at 10–15 °C, then reheated to 90–115 °C for simultaneous biaxial orientation at a blow ratio of 3:1 to 5:1. The orientation window is narrow; below 90 °C transverse-direction bubble puncture occurs at line speeds above 80 m/min, and above 115 °C shrink tension at 120 °C drops below 0.2 MPa, producing loose collation in high-speed shrink tunnels. Terminal products include bottle multipack overwrap, printed tamper-evident sleeves, and frozen turkey overwrap. The final shrink tunnel is operated at 120–150 °C for 4–8 seconds, but residual stress values for this specific blend require measurement under ISO 14616:1997. Because 2.5% VA EVA has lower oxygen permeability than high-VA grades, it is not selected for applications requiring high respiration, such as fresh-cut produce.
| Scenario | EVA addition ratio | Critical process parameter | Terminal product type |
|---|---|---|---|
| Frozen food blown film | 15–30 wt% | Melt temperature 180–215 °C, BUR 2.0:1–2.5:1, die gap 1.8–2.4 mm | IQF pouches, ice cream overwrap |
| Cast film | 5–15 wt% | Melt temperature 215–245 °C, chill roll 15–25 °C | Bakery bags, produce film |
| Extrusion coating | 15–30 wt% | Die temperature 220–260 °C, line speed >300 m/min, chill roll 10–20 °C | Aseptic cartons, sachets |
| Shrink film | 10–25 wt% | Orientation temperature 90–115 °C, tunnel 120–150 °C | Bottle multipacks, sleeves |
| Injection molding | 5–15 wt% | Melt temperature 190–230 °C, mold 15–30 °C, injection pressure 60–90 MPa | Dairy lids, dosing cups |
| Medical packaging | 10–30 wt% | Melt temperature 170–210 °C, seal jaw 100–130 °C | Sterile barrier pouches, IV kit overwrap |
Injection molding of flexible, transparent lids uses 5–15 wt% Elevate EF437 dry-blended into LDPE or metallocene LLDPE. Food-contact compliance is FDA 21 CFR 177.1350 and Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm². The process employs a reciprocating screw injection molding machine with clamp force from 800 kN to 2,500 kN, melt temperature 190–230 °C, mold temperature 15–30 °C, and injection pressure 60–90 MPa. The addition ratio is limited to 15 wt% because higher concentrations reduce melt strength and increase sink marks at thick hinge sections. Terminal product types include dairy cup lids, tamper-evident closures for cold-form containers, and dosing cups. Izod impact is measured by ASTM D256-10(2018); for thin-wall lids, puncture resistance per ASTM D5748-19 is more relevant. A documented incompatibility is melt-phase blending with polypropylene; without a compatibilizer, EVA/PP dry blends delaminate and produce visible haze, so EF437 must be used as the sole polyolefin phase or co-fed with a metallocene LLDPE carrier. Mold release is typically improved by the acetate content, but vent depth and gate size must be adjusted to avoid flash at the EVA-modified viscosity.
Medical device sterile barrier packaging is a validated downstream use when EF437 is blended at 10–30 wt% with LLDPE or MDPE in monolayer blown or cast film. Industry standards are ISO 11607-1:2019 for terminally sterilized medical device packaging and ISO 10993-5:2009 for cytotoxicity; if ethylene oxide sterilization is specified, ISO 11135:2014 applies to the sterilization process. The film is produced on a cleanroom blown film line with melt temperature 170–210 °C and die gap 1.2–2.0 mm; after printing and slitting, it is converted on form-fill-seal equipment with seal jaws at 100–130 °C and dwell times of 0.5–1.5 seconds. Terminal product types are chevron pouches for syringes, header bags for catheters, and IV kit overwrap. Seal strength is tested per ASTM F88/F88M-23; a typical acceptance threshold for 50–75 µm film is 1.0–1.5 lbf/in, but published data for this specific configuration is limited and must be generated under ISO 11607-2:2019 validation protocols. EVA content above 30 wt% is avoided because low molecular weight fractions migrate and may affect ISO 10993-18 chemical characterization results. Pre-drying at 60–70 °C for 2–4 hours is required if storage humidity exceeds 60% RH.
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Elevate EF437 is a low-vinyl-acetate ethylene-vinyl acetate copolymer resin classified as a high-clarity packaging grade. The grade is defined by a vinyl acetate comonomer content of 2.5% by weight and a melt index of 2.0 g/10 min when measured at 190 °C under a 2.16 kg load according to ASTM D1238 or ISO 1133-1:2022. Vinyl acetate content may be verified by Fourier transform infrared spectroscopy using ASTM D5594 or ISO 8985. The resin sits in a narrow compositional band between unmodified low-density polyethylene and EVA copolymers containing 9% to 18% VA. At 2.5% VA, the copolymer retains a largely polyolefinic crystalline architecture, but the comonomer disrupts crystallite growth enough to raise optical clarity and to reduce heat-seal initiation temperature relative to LDPE homopolymer.
Manufacturer-published lot-specific technical data should be consulted for exact product certification limits. Published data for the exact EF437 configuration are limited; the processing windows, comparative ranges, and application statements in this document refer to commercial 2.5% VA, 2.0 MI EVA resins unless otherwise indicated.
The 2.0 MI rheology produces a higher-viscosity melt than 6.0 MI or 8.0 MI EVA grades used for thin-gauge cast film and extrusion coating. On single-screw extruders with an L/D ratio of 24:1 to 30:1 and barrier screws intended for LDPE, EF437 develops a stable melt film at barrel temperatures of 160–190 °C and die temperatures of 175–195 °C. Melt temperatures above 230 °C should be minimized because EVA undergoes deacetylation at elevated temperatures, liberating acetic acid and increasing the probability of gel formation, die-lip deposit, and odour in the finished film. Blown-film lines with a die gap of 0.8–1.5 mm and a blow-up ratio of 2.0:1 to 3.0:1 are typical. The frost-line height should be set to quench the bubble rapidly; slow cooling increases polyethylene crystallite dimensions and degrades the clarity that the comonomer otherwise provides.
Moisture control on production-scale equipment is a routine requirement. Although 2.5% VA content is only mildly polar, condensation on cold pellets stored or transferred at relative humidity above 60% can create bubble defects and reduce film appearance. Pre-drying at 60–70 °C for 4 h or the use of desiccant hoppers is standard before extrusion of high-clarity film. For cast film, melt temperatures of 200–220 °C are common. The 2.0 MI grade is not the first-choice flow index for extrusion coating at line speeds above 150 m/min; high-flow grades of 7 MI or 8 MI are typically specified for low coating weights and fast draw-down. EF437 is therefore positioned for blown film, cast film, and sheet processes in which melt strength and bubble stability are more important than low-viscosity draw-down.
In high-clarity packaging, EF437 is run as a monolayer or as the outer skin of a coextruded structure. The 2.5% VA groups reduce haze relative to LDPE by reducing spherulite size, but the effect is smaller than that obtained with 9% VA or 18% VA copolymers. Wide-angle X-ray scattering of analogous low-VA copolymers shows a slight reduction in crystallinity relative to LDPE, but not the broad amorphous halo observed in 18% VA grades. Film produced at 50 µm thickness on a standard LDPE blown-film line with rapid bubble cooling typically shows haze below 8% when measured according to ASTM D1003; melt temperature, die gap, and blow-up ratio can shift haze by several absolute percentage points. Gloss is controlled by die-lip cleanliness and quench rate. This resin class is specified in fresh produce overwrap, baked goods packaging, and display films in which product visibility must be maintained without the low modulus of high-VA copolymers.
For frozen food packaging, EF437 is frequently coextruded or dry-blended with linear low-density polyethylene to improve low-temperature puncture resistance. The resin alone has lower low-temperature ductility than 9% VA EVA; therefore, a 2.5% VA grade is appropriate when the package requires stiffness and reduced deflection rather than extreme low-temperature impact toughness. Heat-seal initiation temperature is reduced by the VA fraction relative to LDPE, but the reduction is less than that of 9% VA resins. Vertical form-fill-seal machines typically require seal jaw temperatures of 110–140 °C for 50 µm monolayer film at 0.3 MPa sealing pressure and 0.5 s dwell; the exact setting depends on line speed, film gauge, and seal bar geometry.
The structural differentiation of EF437 appears most clearly in modulus and softening behaviour. Because the VA content is only 2.5%, the secant modulus of the resin remains within roughly 15% of an equivalent 2.0 MI LDPE grade when tested under ASTM D882. In contrast, a 9% VA EVA may exhibit a 40–50% reduction in secant modulus, and 18% VA EVA can lose more than 70% of LDPE stiffness. The stiffening benefit is accompanied by higher Vicat softening point and better blocking resistance than high-VA grades. In coextruded structures, EF437 is therefore used as a gloss and stiffness skin over LLDPE or metallocene LLDPE cores, where it reduces blocking while preserving the overall puncture and seal performance of the structure.
The low-VA chemistry also reduces surface tack and film-to-film blocking at ambient warehouse temperatures. This is an operational advantage on high-speed packaging lines where high-VA EVA skins may require additional slip or antiblock additives to prevent reel blocking. The lower polarity of 2.5% VA resin reduces compatibility with polar tie resins and inks compared with 9% or 18% VA grades; therefore, surface treatment such as corona discharge is often necessary for lamination or print adhesion. The corona treatment level for this class is commonly specified between 38–42 mN/m when measured by ASTM D2578 for solvent-based inks and lamination adhesives.
The following table provides typical property ranges for commercial resin classes at equivalent 2.0 MI. The ranges are not EF437 lot certifications, but they indicate the structural position of 2.5% VA EVA between LDPE and higher-VA copolymers.
| Property | Test method | EF437 class (2.5% VA, 2.0 MI) | EVA 9% VA, 2.0 MI | EVA 18% VA, 2.0 MI | LDPE 2.0 MI |
|---|---|---|---|---|---|
| Vinyl acetate | ASTM D5594 / ISO 8985 | 2.5% | 9% | 18% | 0 |
| Melt index | ASTM D1238 / ISO 1133-1:2022 | 2.0 g/10 min | 2.0 g/10 min | 2.0 g/10 min | 2.0 g/10 min |
| Density | ASTM D1505 / ISO 1183-1 | 0.924–0.928 g/cm³ | 0.926–0.932 g/cm³ | 0.937–0.943 g/cm³ | 0.918–0.922 g/cm³ |
| Crystalline melting peak | ASTM D3418 / ISO 11357-3 | 104–109 °C | 98–103 °C | 84–89 °C | 109–113 °C |
| Vicat softening point | ASTM D1525 / ISO 306 | 86–92 °C | 76–84 °C | 58–68 °C | 88–96 °C |
| Secant modulus, film | ASTM D882 | 170–210 MPa | 90–120 MPa | 30–60 MPa | 180–230 MPa |
| Heat seal initiation | ASTM F88 seal curve | 105–115 °C | 85–95 °C | 65–75 °C | 110–120 °C |
The data show that EF437-class resin is closer to LDPE in thermal resistance and film stiffness than to 9% or 18% VA EVA. The principal selection trade-off is that the lower VA content provides only a modest reduction in heat seal initiation and lower clarity enhancement than 9% VA EVA. In return, the resin retains a higher service temperature envelope, lower extractable potential, and better dimensional stability under load.
Product handling of regrind also differs from high-VA EVA. In monolayer packaging, regrind from EF437 can be re-introduced at levels up to 20% without measurable haze increase if the regrind is free from gel and contamination. In coextruded structures, regrind blending must account for the presence of tie resins and sealant layers, which can change the VA concentration of the recycle stream and shift seal initiation temperature.
Food-contact use of EF437 should be validated under the appropriate regulatory framework. Ethylene-vinyl acetate copolymers are addressed in FDA 21 CFR 177.1350 for food-contact articles, subject to extractive limitations and end-use conditions. In the European Union, compliance is assessed under Regulation (EU) No 10/2011, with overall migration limits of 10 mg/dm². Because EVA can release acetic acid when over-processed, organoleptic testing is normally required for sensitive foods. The 2.5% VA content reduces the concentration of acetate-derived migrants relative to 9% or 18% VA grades, but it does not eliminate the requirement for migration testing on the finished package.
Operational boundaries apply during extrusion and purging. EF437 should not be mixed with polymers that degrade exothermically or with strongly acidic purge agents at melt temperatures above 230 °C. Extended residence time in the extruder should be avoided. Degraded carbonaceous deposits on screw roots, die channels, and screen packs can detach and appear as gel specks in high-clarity film. For transitions, a low-MI LDPE purge or a commercial purging compound is preferred. The use of high-VA EVA or adhesive tie resins in the same system may require longer transition times because of differences in melt viscosity and compatibility.
For packaging converters requiring both clarity and stiffness in a single resin, EF437 provides a defined balance. The grade is selected when a 2.0 MI viscosity is acceptable for the extrusion line and when the package does not require the adhesion, low-temperature toughness, or very low seal initiation temperature of 9% VA or higher copolymers. In multi-layer packaging, it is most often positioned as an outer skin or as a blending resin with LLDPE to improve clarity and processability while retaining structural rigidity.
