| HS Code | 191548 |
| Product Name | Elevate EF539 EVA Copolymer Resin |
| Resin Type | Ethylene Vinyl Acetate (EVA) Copolymer |
| Grade | Thermal Lamination Grade |
| Vinyl Acetate Content | 18% |
| Melt Index | 30 g/10 min |
| Density | 0.940 g/cm3 |
| Melting Point | 88 °C |
| Vicat Softening Point | 68 °C |
| Tensile Strength At Break | 8.3 MPa |
| Elongation At Break | 750% |
| Hardness | 90 Shore A |
| Brittleness Temperature | -70 °C |
| Form | Pellets |
| Appearance | Natural / Transparent |
| Typical Application | Thermal lamination films, hot melt adhesives, extrusion coating |
As an accredited Elevate EF539 EVA Copolymer Resin,18% VA,30 MI,Thermal Lamination Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg polyethylene bags, palletized and stretch-wrapped, with labels showing product name, grade, lot number, and handling instructions. |
| Container Loading (20′ FCL) | Load 20′ FCL with palletized 25kg bags of Elevate EF539 EVA resin; secure cargo, ventilate, and avoid moisture to ensure safe transport. |
| Shipping | Elevate EF539 EVA Copolymer Resin (18% VA, 30 MI, thermal lamination grade) ships as solid pellets in moisture-resistant bags or bulk containers. Store away from heat, ignition sources, and oxidizers. Ensure adequate ventilation; avoid dust accumulation. Transport in dry, covered vehicles, protecting from moisture and physical damage. |
| Storage | Store Elevate EF539 EVA Copolymer Resin in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep the original container tightly closed to prevent moisture pickup and contamination. Avoid contact with strong oxidizers. Maintain moderate temperatures below 40°C (104°F) and ensure area is clean and dry to preserve resin quality and safety. |
| Shelf Life | Store in a cool, dry place away from heat and moisture. Shelf life is two years from date of manufacture. |
In photovoltaic module manufacturing, EVA copolymers are processed into encapsulant films that must survive damp-heat exposure of 1000 h at 85 °C/85% RH under IEC 61215-2:2021 qualification testing. EF539 with 18% VA content and 30 g/10 min melt flow rate measured by ISO 1133-1:2022 at 190 °C/2.16 kg is not positioned as a full-thickness primary front-side encapsulant; conventional primary encapsulant formulations typically use 28%–33% VA to maintain interfacial adhesion to glass after wet exposure and thermal cycling. The lower vinyl acetate content in EF539 reduces equilibrium water uptake and acetic acid evolution but also reduces the population of polar acetate sites available for silane coupling and glass bonding. On production-scale cast film lines, the 30 MI viscosity is suitable for thin tie-layer or backsheet adhesive webs and is frequently processed through 75–90 mm single-screw extruders with 28:1–30:1 L/D ratios and melt pumps to damp pressure fluctuations. Screw speeds above 85 rpm without melt-pump control have been associated in converter reports with pressure variation exceeding ±6 bar and transverse thickness variation at the die, a failure mode that appears later as lamination voids after vacuum bag cycling. Melt temperatures are normally held between 175 °C and 210 °C; above 220 °C deacetylation accelerates, releasing acetic acid that corrodes downstream rolls and creates pinholes. At module lamination, vacuum or roller presses operate at platen temperatures of 135–150 °C. When EF539 is used as a backsheet tie layer rather than a front encapsulant, gel content after peroxide or silane-grafted formulation is checked by xylene extraction and the target range is generally 70–90% for environmental stress crack resistance. Published data for EF539 as the sole front-side encapsulant in a full IEC module stack is limited, so converter qualification must include adhesion after damp heat and peel testing on both glass and backsheet surfaces.
| Property or compliance area | Test method | Application relevance |
|---|---|---|
| Melt flow rate | ISO 1133-1:2022 | Viscosity control at 190 °C/2.16 kg for extrusion lamination die flow and web penetration |
| Vinyl acetate content | ASTM D5594 | Confirms 18% polar comonomer level for adhesion and thermal stability boundaries |
| Density | ISO 1183 | Converts film gauge to coating weight on lamination lines |
| Film tensile and elongation | ASTM D882 / ISO 527-3 | Cast film qualification for roll-to-roll lamination and die cutting |
| Haze and clarity | ASTM D1003 / ISO 14782 | Graphic arts laminates and glass tie layers requiring optical grading |
| T-peel adhesion | ASTM D1876 / ISO 11339 | Aluminum foil, textile, and automotive substrate bond strength after lamination |
| PV module qualification | IEC 61215-2:2021 | Damp heat, thermal cycling, and wet leakage current for encapsulated modules |
| Food contact | FDA 21 CFR 177.1350 / EU 10/2011 | Migration verification in flexible packaging laminates |
Flexible packaging converters use extrusion lamination to bond aluminum foil to paper, oriented polyester, or bi-oriented polyamide webs. In this process, EF539 is melted and extruded through a slot die at melt temperatures between 200 °C and 230 °C, drawn through a controlled air gap, and pressed into a chilled nip. The 30 MI melt flow supports low-viscosity wetting of oxidized aluminum, but the process window is bounded by thermal degradation. Above 230 °C, EVA begins deacetylation, releasing acetic acid that causes die-lip deposit formation, pinholes in the extrudate, and inconsistent peel strength. The critical operator-controlled parameters are melt temperature, air gap, nip pressure, corona treatment, and web speed. On a 1200 mm-wide lamination line, coating weights from 12 g/m² to 20 g/m² are common; below 10 g/m² the melt curtain tends to neck in and gauge variation causes peel forces to fall below 2.0 N/15mm when measured by ASTM D1876. Aluminum foil adhesion does not rely solely on vinyl acetate content because an inline corona discharge unit at 3–5 kW/m² oxidizes the metal surface before the nip, and ozone treatment of the melt curtain creates additional polar species at the polymer surface. EVA with 18% VA is not an acid-copolymer tie resin; it does not generate the same adhesion level to unprimed foil as maleic anhydride grafted materials, so converters should not use it for retort-heavy or aggressive acidic food packages without adhesion qualification. For laminates intended for food, migration of vinyl acetate monomer is evaluated under FDA 21 CFR 177.1350 and EU Regulation 10/2011, and specific migration limits apply to the finished package rather than the raw resin alone. Seal integrity after lamination is commonly tested by ASTM F88 for heat seal strength; if the EVA layer does not provide the required seal strength, a separate sealant layer must be used. Production failure modes include surging from pellet feed bridging, which appears as repeating transverse gauge bands, and roll blocking of the laminate when take-up reel tension exceeds 400 N/m on thin substrates.
When thermal laminating films are downgauged below 30 µm, the viscoelastic response of the adhesive layer at nip temperature determines whether curl, optical haze, and delamination develop within the first 24 h after converting. Document finishing and book-cover lamination use biaxially oriented PET or BOPP films coated or coextruded with EVA; EF539 can function as the adhesive layer because the 18% VA content raises the softening point relative to 28% VA grades, reducing blocking of pre-coated roll stock during warehouse storage. The 30 MI flow supports slot-die coating and cast film coextrusion at die temperatures of 190–210 °C. During roll-to-roll thermal lamination, heated roller temperatures between 90 °C and 120 °C activate the EVA surface; the required setting is a function of web speed, calender pressure, and substrate surface energy. A minimum nip dwell of 1.5–3.0 s is typically needed to wet uncoated paper and avoid speckling defects. Film haze after lamination is sensitive to quench roll temperature; chill roll settings below 15 °C increase surface smoothness but may introduce condensation defects when ambient relative humidity exceeds 60%. Optical performance is specified by ASTM D1003 and ISO 14782 for haze, while tensile elongation on the thin adhesive film is measured by ASTM D882. Because the vinyl acetate content is at the lower boundary, cold lamination without thermal activation generally produces insufficient fiber tear on uncoated cover stock, and the converter must verify peel strength after low-temperature storage at −20 °C if the finished document is shipped in winter conditions.
In architectural laminated glass, interlayer films are normally specified with vinyl acetate contents closer to 26–33% to maintain adhesion and acoustic damping. EF539 at 18% VA is therefore not used as the primary structural interlayer; it occupies a narrower function as an edge-seal or thin tie layer within multi-layer interlayer constructions where lower water absorption and higher creep resistance reduce edge clouding and delamination propagation. Glass layup processing uses nip-roll pre-lamination followed by autoclave cycles at 120–135 °C and 1.0–1.2 MPa for 30–60 min, conditions that are sufficient to wet glass but require surface treatment or a silane-primed interface when low-VA EVA is used. Adhesion to glass is measured by compressive shear, pummel, or bake tests following the relevant parts of EN ISO 12543. The lower equilibrium moisture uptake of EF539 compared with higher-VA grades is a measurable advantage for edge stability in humid climates, but this benefit does not offset the reduced intrinsic adhesion to bare glass. Pre-drying of film rolls at 60–70 °C for 4–6 h is recommended when layup is conducted at relative humidity above 60%, because residual moisture generates bubbles during the autoclave cycle. Published data for bare EF539 as the sole glass interlayer is limited, and fabricators using it in structural glass must qualify weathering adhesion independently.
Automotive interior lamination converts rigid substrates such as ABS, polycarbonate, or thermoplastic olefin into soft-touch instrument panels, door bolsters, and consoles. EF539 can be extruded as unsupported film or coextruded as a tie layer to bond PVC, TPO, or nonwoven skins under vacuum forming. The 30 MI melt flow provides low activation energy in vacuum lamination presses with surface temperatures of 110–140 °C; however, the low melt viscosity also increases the risk of grain read-through when textured skins are pressed into heated substrates. Multi-zone infrared preheating arrays must control peak surface temperature within ±3 °C across a 1.8 m-wide tool because the processing window between initial tack and excessive flow is narrow. When substrate temperature exceeds 150 °C, EF539 can flow into the grain valleys of PVC or TPO skins, creating gloss variation and visible read-through after cooling. The 18% VA content is relevant for interior air quality: lower vinyl acetate content reduces acetic acid evolution during heat aging compared with higher-VA copolymers, and emissions are measured by thermodesorption methods such as VDA 278. Flammability of the laminated assembly is evaluated under FMVSS 302; fogging behavior is measured according to ISO 6452 or OEM-specific condensing surface methods. Adhesion after heat aging at 90 °C for 240 h is commonly required to detect interfacial delamination before the lamination process is released for production.
Technical textile and membrane lamination bonds woven or nonwoven fabrics to breathable films or open-cell foams for filtration media, medical drapes, and sports applications. In hot-melt film or web form, EF539 can be cast at 15–30 g/m² and nipped to fabric at 100–130 °C. The 18% VA content creates a narrower melting range than EVA grades with 28% VA, reducing strike-through into low-density nonwovens. Because the 30 MI viscosity is low, excessive nip pressure can drive the molten adhesive into lightweight scrims and create stiff fabric; engraved application rolls with 20–40% land area limit surface contact and control adhesive transfer. Peel adhesion is tested according to ASTM D1876 or ISO 11339; adhesion above 6 N/25mm is achievable on corona-treated polyester and polyamide fabrics when surface energy exceeds 44 mN/m. Washing durability depends on the substrate and the lamination pattern; medical fabric laminates may be required to pass laundering protocols based on ISO 6330 or ISO 105-C06. The EVA layer itself is not the sole determinant of seam strength, and when the textile is intended for autoclave sterilization at 121 °C, the converter must verify that the adhesive film does not soften beyond the required peel retention. Published data for this specific EF539 configuration in reusable textile systems is limited, so pilot-scale wash testing is necessary before production release.
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Elevate EF539 is categorized as an ethylene-vinyl acetate copolymer resin with a nominal vinyl acetate content of 18% by weight and a melt flow rate of 30 g/10 min determined at 190 °C under a 2.16 kg piston load in accordance with ISO 1133-1:2022 or ASTM D1238-23a Condition 190/2.16. The resin is designated for thermal lamination, a process in which the polymer is either extrusion-coated directly onto a web or supplied as a pre-formed film that is activated under heated nip rolls. The 18% vinyl acetate fraction introduces random acetate pendant groups that interrupt polyethylene crystallinity, lowering the peak melting endotherm and reducing the energy needed for substrate wetting. Reported density for comparable 18% VA EVA copolymers typically falls near 0.940 g/cm³ when measured by ISO 1183-1:2019. The melt flow rate of 30 g/10 min corresponds to a molecular weight distribution and viscosity curve designed for thin-gauge melt application; it permits draw-down to typical thermal lamination coating weights between 8 g/m² and 20 g/m² while avoiding the excessive melt pressure associated with lower-MFI extrusion grades. The material is differentiated from low-VA EVA grades by its lower melting plateau and from high-VA tackifier-rich compounds by its cleaner film release and lower blocking tendency. In thermal lamination, EF539-type resins are used to bond porous paper, coated board, and polymer films without solvent-borne adhesives. The resulting laminate develops its full interfacial adhesion after the polymer cools below the crystallization temperature, which for this VA level is typically in the range of 55 °C to 62 °C. The polymer is not intended for structural adhesive applications where a thermosetting crosslinked bond is required; it remains thermoplastic and therefore retains a measurable softening point.
The pendant acetate group in EVA contributes both polar attraction and free volume. At 18% VA, the copolymer develops measurable dipole-dipole interactions with polyester and polyamide surfaces, as well as hydrogen bonding with oxidized aluminum foil and corona-treated polyolefin. In thermal lamination, these interactions reduce the need for solvent-based primers and allow direct melt contact to paper and board. Hot-seal testing of EVA with 18% VA generally shows seal initiation near 72 °C to 78 °C at 0.4 N/mm² sealing pressure and 1 s dwell when measured according to ASTM F1921-18 or ASTM F88/F88M-23. The exact initiation temperature for EF539 on a given substrate depends on corona treatment level, surface energy, and coating weight; published data for this specific configuration is limited, so converter-level trials are required for final specification. Compared with a 9% VA EVA, the 18% VA grade reduces seal initiation temperature by approximately 10 °C to 15 °C and improves wetting on polar substrates. The polar modification also increases surface friction in unmodified form; anti-block additives are commonly present. Peel adhesion of EVA laminates to aluminum foil is frequently measured by ASTM D1876-08 T-peel or ASTM F904-16; for a 18% VA, 30 MI grade, converter data on foil often fall between 0.4 N/mm and 1.5 N/mm depending on coating weight and foil pretreatment, though EF539-specific values require supplier confirmation. The VA content also lowers the glass transition temperature to a reported range of -25 °C to -20 °C by dynamic mechanical analysis; this supports lamination flexibility but sets a practical lower service boundary near -25 °C for high-speed flexing. The amorphous acetate-containing phase is softer at room temperature than a low-VA grade, which can increase blocking if the laminated roll is stored at temperatures above 35 °C.
On a production-scale single-screw extrusion coating line, EF539 is processed with a screw of L/D 24:1 to 30:1 and a compression ratio of 2.8:1 to 3.5:1; grooved-feed extruders are not required because the resin does not present the high melting pressure of a 2 MI polyethylene. Barrel profiles are typically ramped from 120 °C to 140 °C at the feed section to 210 °C to 230 °C at the metering and die sections. The melt temperature measured at the adapter should be held between 210 °C and 230 °C. At these temperatures, a 30 MI EVA exhibits low melt viscosity and can be drawn through a flat die with a 0.5 mm to 0.8 mm die gap. For a 90 mm extruder running EF539 at 150 kg/h, die pressure at 220 °C is commonly between 5 MPa and 10 MPa for a 1,200 mm die, depending on die design. The air gap between die lip and chill roll is normally kept between 10 cm and 25 cm; shorter air gaps improve adhesion but reduce oxidation time. Chill roll temperatures of 10 °C to 20 °C are typical. If the chill roll is held above 30 °C, the amorphous phase may retain sufficient tack to create blocking on the rewound laminate. The vacuum or nip pressure at lamination is set between 0.3 MPa and 0.6 MPa depending on calender roll hardness and substrate compressibility. For pre-formed film thermal lamination, heated nip rolls are run at 90 °C to 120 °C; dwell time is controlled by line speed and roll wrap angle. At line speeds above 150 m/min, heating must be increased or film thickness reduced because residence time becomes less than 1 s and interfacial wetting may be incomplete. Moisture on paper substrates can generate steam bubbles at the nip; therefore paper moisture should be below 8% by weight before lamination.
Deacetylation is the principal thermal degradation pathway for EVA. The reaction eliminates acetic acid from pendant acetate groups, generating unsaturation and later crosslinking. At melt temperatures above 220 °C, acetic acid formation can be detected by odor and downstream metal corrosion; above 240 °C, the deacetylation rate increases sharply. In production-scale thermal lamination, the die-lip melt temperature should therefore be maintained at 210 °C to 230 °C, and total residence time at melt temperature should not exceed 15 min for conventional screws. When line stoppages last longer than 10 min, barrel temperatures near the die should be trimmed below 180 °C or the screw purged with a low-MFI polyethylene. Failure modes observed on industrial lines include brown gel particles at the die lip, vinegar-like odor, fluctuating melt pressure, and a drop in peel adhesion to foil and polyester. The adhesion loss is caused by chain branching and incipient crosslinking, which broaden molecular weight distribution and reduce interfacial diffusion. If gel content measured by extraction in boiling xylene exceeds 0.5% by weight, the extruder adapter, feedback, and screen packs should be inspected for dead zones. Acetic acid concentration in the melt film can be monitored indirectly by pH measurement of condensed volatiles at the die. A condensate pH below 3.5 during stable operation indicates significant thermal degradation. The screw should be purged if condensate pH falls below 3.0 or if melt pressure variation exceeds ±0.5 MPa at constant screw speed.
Screw designs with poor mixing can create local hot spots even when the adapter melt temperature is within the stated range; therefore, low-shear barrier screws with static mixers are preferred over high-shear Maddock sections at residence time near the upper limit. The presence of free acetic acid in the melt also accelerates corrosion of carbon steel surfaces; stainless steel or chrome-plated flow paths are recommended for long campaigns. In cast-film thermal lamination, preheating rolls above 120 °C should not be used with dwell times longer than 5 s because surface deacetylation can generate bubbles and reduce optical clarity. The processor should monitor the vinyl acetate content of degraded samples by Fourier transform infrared spectroscopy or saponification; a reduction in VA content of more than 1% absolute indicates thermal history beyond the intended operating envelope.
Differences between EF539 and adjacent resin classes become visible in melt pressure, edge-neck-in, and adhesion to polar substrates. Compared with a 12% VA / 20 MI EVA often used for general extrusion coating, EF539 lowers the peak melting temperature by roughly 10 °C and allows adhesive lamination at lower melt temperatures. Compared with a 18% VA / 7 MI grade, the 30 MI version generates lower melt pressure at a given screw speed and better thin-gauge draw-down, but it also has lower melt strength and may exhibit wider edge-neck-in on high-speed lines. On a 1,200 mm flat die, a change from 7 MI to 30 MI can increase total edge-neck-in by 10 mm to 20 mm per side at 220 °C and 150 m/min line speed; die opening and air gap must be re-optimized to maintain edge stability. The table below summarizes typical comparative values from resin class data used in converter evaluations.
| Characteristic | EF539 targeted range | Low-VA extrusion coating EVA | Low-MI thermal lamination EVA | Test method |
|---|---|---|---|---|
| Vinyl acetate content | 18% | 9% to 12% | 18% | FTIR/TGA |
| Melt flow rate | 30 g/10 min | 20 g/10 min | 7 g/10 min | ISO 1133-1:2022 |
| Density | 0.940 g/cm³ | 0.930 g/cm³ | 0.940 g/cm³ | ISO 1183-1:2019 |
| Peak melting temperature | 84 °C to 86 °C | 92 °C to 96 °C | 84 °C to 86 °C | ASTM D3418-21 |
| Vicat softening temperature | 54 °C to 60 °C | 65 °C to 72 °C | 55 °C to 62 °C | ISO 306:2022 |
Retortable structures often combine an aluminum foil barrier with a heat-sealant film. A thermoplastic EVA tie layer can be used between foil and cast polypropylene or between foil and polyethylene, but EVA is not a high-temperature retort adhesive. Steam retort at 121 °C for 30 min imposes a thermal load that softens EVA and can promote interfacial creep. Published data for EF539 under these exact retort conditions is limited; therefore, qualification requires post-retort T-peel testing per ASTM F904-16 and visual inspection for tunneling. Ester-containing polymers are susceptible to hydrolysis when combined with moisture-retaining substrates and high temperature. This limitation excludes EF539 from direct substitution into amine-cured polyurethane adhesive applications without full lamination qualification. Continuous service temperature should remain below 60 °C for most non-crosslinked EVA laminates; exposure above this boundary can produce progressive blocking, delamination, and acetic acid release.
In food-contact applications, the grade must comply with the applicable regulatory framework. In the European Union, Regulation (EU) No 10/2011 and amendments apply to plastic materials and articles intended to come into contact with food; in the United States, ethylene-vinyl acetate copolymers are referenced in 21 CFR 177.1350. These citations are regulatory references, not processing instructions; specific migration limits and overall migration limits must be evaluated on the final laminate. The resin should not be blended with amine-terminated adhesion promoters, strong alkaline fillers, or high levels of unneutralized stearate salts because these components accelerate ester hydrolysis and can generate metal carboxylate gels. If corona treatment of the primary web exceeds 48 dyn/cm surface energy in the presence of EF539, oxidative species at the interface may reduce peel adhesion after aging. When EF539 is used as a foil-to-polypropylene tie layer, the converter should measure post-retort bond strength after 24 h and after a 7-day aging period at 40 °C in 75% relative humidity to detect latent deacetylation effects.
Quality control of incoming EF539 should include melt flow rate per ISO 1133-1:2022 or ASTM D1238-23a, vinyl acetate content by Fourier transform infrared spectroscopy or saponification, and density per ISO 1183-1:2019. Moisture content should be below 0.05% by weight for thin-gauge lamination; if storage occurs above 60% relative humidity, pre-drying at 60 °C to 70 °C for 4 h to 6 h in a desiccant dryer is recommended. EVA is not highly hygroscopic, but surface moisture on pellets can generate voids in coatings below 10 g/m². For extrusion coating, the resin should be processed under inert gas in the feed hopper if the line is located in a high-humidity environment, or if the hopper residence time exceeds 8 h. The final laminate should be tested for heat-seal strength and adhesion after 24 h maturation because EVA adhesion to aluminum foil and polyester can continue to develop during cooling and crystallization. A minimum sampling plan of 10 specimens per reel is common when following ISO 2859-1 or the converter’s internal SPC procedure. The difference between EF539 and a solvent-based polyurethane laminating adhesive is that EF539 provides a thermoplastic bond with no post-cure dwell; however, the bond remains thermoplastic and lacks the crosslinked network of a two-component polyurethane. Therefore, EF539 is appropriate for standard thermal lamination applications where processing efficiency and moderate temperature resistance are required, while high-temperature retortable or aggressive chemical-resistant structures require a thermoset system or specialized tie-layer resin.
