| Código SH | 456164 |
| Conteúdo Va | 18,5% |
| Índice De Fusão | 2,5 g /10 min |
| Densidade | 0,940 g /cm³ |
| Ponto De Fusão | 84 ° C |
| Ponto De Amolecimento Vicat | 62 ° C |
| Resistência à Tração Na Ruptura | 20 MPa |
| Alongamento Na Ruptura | 800% |
| Dureza Da Costa | 90 A |
| Temperatura De Fragilidade | -76 ° C |
| Filme Haze | 2% |
| Brilho De Filme | 75 |
Como fábrica credenciada Elevar EF528 EVA Copolímero Resina, 18,5% VA, 2,5 MI, Filme & Tubing Grade, aplicamos protocolos de qualidade rigorosos - cada lote é submetido a testes rigorosos para garantir padrões de eficácia e segurança consistentes.
| Embalagem | A resina de copolímero EVA Elevate EF528 é embalada como pellets de fluxo livre em sacos de papel multiparede de 25 kg, paletizados para produção de filmes e tubos. |
| Carga de contêiner (20' FCL) | Carga FCL de 20 "da resina de copolímero EVA Elevate EF528: sacos de 25 kg, paletizados, envoltos em encolhimento, cerca de 24 toneladas métricas de peso líquido. |
| Envio | Eleve os navios de resina de copolímero EF528 EVA como pelotas sólidas em sacos de 25 kg, sacos a granel ou caminhões /vagões. Mantenha seco e fresco durante o transporte, longe do calor, faíscas e luz solar direta. Use equipamentos limpos e ventilados para evitar contaminação. Siga as diretrizes do SDS; o material não é perigoso, mas requer medidas padrão de controle de poeira e manuseio. |
| Armazenamento | Armazene a resina de copolímero EVA EF528 EVA em uma área fria, seca e bem ventilada, longe da luz solar direta, fontes de calor, umidade e agentes oxidantes. Mantenha os recipientes bem fechados para evitar contaminação e coleta de umidade. Evite o armazenamento prolongado acima de 50 ° C; as pelotas podem amolecer ou bloquear. Mantenha uma boa limpeza para minimizar a poeira e use ventilação adequada. |
| Prazo de validade | Armazene em uma área fria e seca, longe de UV. A vida útil é normalmente de dois anos a partir da data de fabricação. |
Quando a embalagem de carne processada refrigerada é executada a velocidades de tela acima de 180 m/min, a pele selante não pode ser tratada como um simples exercício de diminuição do polietileno. Elevar EF528 EVA resina copolímero com 18,5% em peso acetato de vinilo e um 2,5 g/10 min índice de fusão, medido sob ASTM D1238-20 a 190 °C /2,16 kg, é misturado a 20-30% em peso em um 1,0 MI buteno LLDPE para diminuir a temperatura de iniciação da vedação sem sacrificar a aderência quente. A resina é adicionalmente caracterizada por uma densidade de 0,940 g/cm³ sob ASTM D1505-18 e conteúdo de acetato de vinilo verificado por FTIR calibrado para ASTM D5594-18. Em uma linha de filme soprado de nove camadas com uma extrusora de alimentação ranurada 30:1 L/D e uma lacuna de matriz 1,4 mm, a temperatura de fusão é mantida em 163–172 °C, e a pressão da matriz cai de 32 MPa para o controle LDPE para 26 MPa quando o EF528 está presente. Valores de resistência à vedação obtidos sob ASTM F88/F88M-21 a 82 °C temperatura da barra de vedação, 0,5 s permanência, e 0,35 N/mm² alcance de pressão 38–42 N/15 mm; as mesmas estruturas retêm 31–34 N/15 mm após 30 dias a -18 °C. A película é então laminada em um 12 µm poliéster ou tela externa de nylon orientada biaxialmente e convertida em sacos de vegetais congelados, envoltura de carne processada e laminações de barreira de queijo. A evolução do ácido acético torna-se mensurável como uma queda de pH na água de extinção quando a temperatura de fusão excede 205 °C; portanto, as zonas de adaptador e matriz são limitadas ao máximo de 175 °C, e a linha é purgada com LDPE de baixa MI antes do desligamento para evitar a formação de char.
Elevar EF528 EVA Copolímero Resina, 18,5% VA, 2,5 MI, Filme & Tubing Preços competitivos que se ajustam ao seu orçamento - termos flexíveis e orçamentos personalizados para cada encomenda.
Para amostras, preços ou mais informações, entre em contato conosco em +8615380400285 Ou envie para sales2@liwei-chem.com.
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Pagamento flexível, preço competitivo, serviço premium - Consulte-nos agora!
Elevate EF528 is an ethylene-vinyl acetate copolymer resin supplied as free-flowing pellets for blown film, cast film, and small-diameter flexible tubing extrusion. The grade carries a nominal vinyl acetate comonomer content of 18.5% by weight, determined by Fourier transform infrared spectroscopy in accordance with ISO 8985 or ASTM D5594, and a melt mass-flow rate of 2.5 g/10 min tested at 190°C under 2.16 kg load per ISO 1133-1:2022 or ASTM D1238. Typical density for this copolymer class is reported near 0.94 g/cm³ under ISO 1183-1. The primary specifications define a mid-range vinyl acetate film and tubing grade that provides a controlled balance between polyethylene-like melt strength and acetate-side-group flexibility; the grade is not classified as a high-flow injection moulding resin or an adhesive tie-layer concentrate.
Because EF528 is a random ethylene-vinyl acetate copolymer, the vinyl acetate comonomer units disrupt polyethylene crystallinity and shift secondary bonding along the polymer backbone. This molecular feature lowers melting point, reduces stiffness, increases toughness at low temperature, and alters polarity-dependent properties such as adhesion, sealing, and permeability. The following sections examine specifications, processing limits, comparative performance, and regulatory verification for this product class.
At 18.5% vinyl acetate by weight, EF528 falls between low-VA grades often used as tough LDPE modifiers and high-VA grades used for elastomeric film and hot-melt adhesive blends. The acetate side groups reduce crystallite size and total crystalline fraction; published representative data for ethylene-vinyl acetate copolymers in the 17–19 wt% VA interval indicate a density of 0.935–0.945 g/cm³, a DSC peak melting temperature of 84–88°C under ISO 11357-3, and a crystallinity of approximately 15–25% relative to the theoretical heat of fusion for polyethylene. These values are class-referenced and do not replace lot-specific certificate-of-analysis values.
The reduction in crystallinity lowers the temperature at which sealant layers begin to fuse. Published comparative data for EVA copolymers indicate that increasing vinyl acetate from 9% to 18% lowers heat-seal initiation temperature by approximately 5–10°C, but direct substitution in a finished structure must be verified with seal-strength testing under ASTM F88 because sealant layer thickness and interface composition influence the response. Hardness is lower than LDPE; Shore D readings under ISO 868 after 15 s are expected in the 40–45 range for this VA class, while an LDPE homopolymer may read above 50. Since EF528 has 2.5 MI, the melt viscosity remains higher than that of a 25 MI EVA, which preserves bubble stability in blown film but restricts throughput in thin-wall tubing dies where high shear rates can cause melt fracture if melt temperature is below 160°C.
Tensile strength at break for melt-pressed or blown film specimens in this VA range is commonly measured in the range of 14–20 MPa machine direction under ISO 527-3 or ASTM D882, while low-density polyethylene can exceed 20 MPa. The same composition provides higher elongation and improved puncture behaviour at cold temperatures; the brittle point is below -70°C for many EVA copolymers at 18–20% VA, but lot-specific low-temperature data should be requested because additive package and orientation affect the result.
Water vapour transmission increases with vinyl acetate content because acetate groups are more polar than ethylene repeat units. Under ASTM F1249, an 18.5% VA film may show higher water vapour transmission than an LDPE film of identical thickness; oxygen transmission under ASTM D3985 may also increase relative to LDPE due to reduced crystallinity. These permeability shifts are design-relevant for breathable packaging and greenhouse film applications, where moisture regulation is operational rather than a defect.
EF528 is intended for single-screw extrusion equipment rather than large-scale injection moulding. Blown film lines with 24:1 to 30:1 L/D, barrier screws or Maddock mixing sections, and spiral mandrel or side-fed dies are appropriate for this grade. Initial melt temperatures should be set between 160°C and 200°C; exceeding 220°C for more than a few minutes initiates deacetylation of the vinyl acetate comonomer, producing acetic acid and causing odour, die-lip deposit, and loss of physical properties. Chrome-plated or nitrided barrel, screw, adapter, and die surfaces are specified for continuous production because the acetic acid released during thermal degradation is mildly corrosive.
Pellets should be pre-dried at 70–80°C for 4–6 hours if storage relative humidity has exceeded 60% or if surface moisture is suspected. Polyethylene-based pellets can carry surface moisture; residual moisture above 0.05% produces bubble defects, reduced gloss, and unstable bubble geometry. Dry-air desiccant drying with a dew point of -40°C or lower is used on production lines where film clarity is critical. When a vented extruder is available, vacuum venting reduces the need for pre-drying but does not eliminate acetic acid formation if melt temperature exceeds the degradation threshold.
For blown film, die gaps of 0.8–1.5 mm and blow-up ratios between 1.8:1 and 3.0:1 are typical starting points for similar melt-index EVA film grades. Frost-line height should be controlled within stable limits; a frost-line positioned too low can generate high film tension and machine direction orientation, while a high frost line can reduce bubble stability. Cast film lines may use chill-roll temperatures of 15–25°C to limit roll blocking. For small-diameter tubing, crosshead dies with air or water cooling are used; melt pressures at the die are generally lower than high-flow EVA but require stable extrudate temperature to avoid flow marks.
Production-scale failure modes reported for EVA film grades with 17–19% VA include melt fracture at die land temperatures below 150°C, port-line film blocking on warm slitting surfaces, and bubble instability when die pressure or cooling airflow is not matched to the resin’s melt strength. Scheduled die cleaning is required because low levels of additives can accumulate over continuous runs exceeding 48 hours.
Published data for this exact EF528 configuration is limited; therefore, these processing windows are starting parameters derived from standard EVA film and tubing practice and should be adjusted against the line’s actual die geometry, haul-off speed, and temperature profile.
Optical properties for EVA film in the 17–19% VA class are controlled by quench rate, die gap, and cooling air temperature. Higher VA content lowers crystallinity and generally improves clarity relative to LDPE, but blocking may increase unless antiblock or slip additives are included. For greenhouse film, UV stabilisation is not a function of the base resin and must be introduced through a masterbatch suitable for the intended exposure period; long-term weathering claims require testing under ISO 4892-2 or ASTM G154 with defined irradiance and wetting cycles. The 18.5% VA resin itself does not confer sufficient UV resistance for multi-season agricultural service without formulation.
Heat-seal performance can be evaluated on film specimens under ASTM F88 at seal temperatures typically 15–25°C lower than those required for LDPE of similar MI. The seal plateau for EF528 is broader than for a 28% VA grade because the material remains dimensionally stable at higher temperatures, but the seal initiation is higher than high-VA resins. These differences are product-specific and must be established on the actual film line with a seal-temperature ladder every 10°C.
Compared with a 9 wt% VA EVA of the same 2.5 MI, EF528 exhibits lower crystallinity, lower heat resistance, lower tensile modulus, and better low-temperature flexibility. The higher vinyl acetate content also increases polarity, which improves adhesion to polar substrates and compatibility with some fillers, but reduces resistance to moisture vapour and may increase blocking tendency on film surfaces. For applications in which high clarity and a soft surface are required at refrigeration temperatures, the 18.5% VA grade is selected; where heat resistance or stiffness is the limiting design parameter, a low-VA grade may be preferred.
Compared with a 28 wt% VA EVA, EF528 shows higher hardness, lower elongation, lower blocking, and higher melting point. The 28% VA copolymer is more elastomeric and more frequently used in hot-melt adhesive concentrates, foam, and high-tack film layers; EF528 remains sufficiently polyethylene-like for self-supporting film and tubing without the high screw torque and melt-temperature sensitivity of high-VA materials. In blown film, the 2.5 MI viscosity of EF528 contributes more bubble stability than a 25 MI EVA but limits drawdown to very thin gauges under high-speed haul-off.
Against LDPE homopolymer, EF528 has a lower melting peak, lower flexural modulus, higher low-temperature crack resistance, and a broader heat-seal window. The polar vinyl acetate content also changes surface energy, which affects printability and lamination performance; corona treatment or flame treatment may still be required, but surface wetting retention can differ from LDPE. Film produced from EF528 typically has higher cling and toughness than LDPE at equivalent gauge, but lower moisture-barrier capability and lower tensile yield.
Oscillatory shear rheology may show a shear-thinning index consistent with linear EVA resins: at 150°C, complex viscosity at 0.1 rad/s is higher than at 100 rad/s by approximately one-to-two orders of magnitude; the 2.5 MI grade exhibits higher zero-shear viscosity than a 25 MI EVA, which improves low-sag bubble stability but increases extruder back pressure. Capillary rheometry under ISO 11443 at 190°C can be used to verify melt fracture limits, particularly for thin-gauge tubing.
For radio-frequency welding, higher VA grades absorb energy more readily because of increased polarisable acetate groups. A 28% VA EVA welds with lower power or shorter cycle time than EF528; an 18.5% VA resin is generally suited to seal-layer use but may require power adjustment in RF-welded medical or industrial products. For conventional thermal sealing, EF528 can provide a broader sealing window than LDPE, but slower than high-VA grades.
| Property class | Low-VA EVA (9% /2.5 MI) | EF528 class (18.5% VA /2.5 MI) | High-VA EVA (28% /2.5 MI) | Test method |
|---|---|---|---|---|
| Density | 0.925–0.935 g/cm³ | 0.935–0.945 g/cm³ | 0.950–0.960 g/cm³ | ISO 1183-1 |
| DSC peak melting temperature | 95–100°C | 84–88°C | 70–74°C | ISO 11357-3 |
| Shore D hardness after 15 s | 48–52 | 40–45 | 32–36 | ISO 868 |
| Flexural modulus | 70–90 MPa | 50–70 MPa | 25–40 MPa | ISO 178 |
| Tensile strength at break, film | 20–26 MPa | 14–20 MPa | 8–12 MPa | ISO 527-3 |
The values in this table are representative literature ranges for ethylene-vinyl acetate copolymer classes, not specification limits for the Elevate EF528 lot. Batch-specific values are provided in the certificate of analysis and may vary with additive package and test specimen preparation.
Grade selection therefore hinges on whether the product requires the low-temperature flexibility of 18.5% VA without the blocking and torque limitations of 28% VA. For greenhouse films, lower VA may be used when thermal retention and stiffness dominate; 18.5% VA is used where clinging, puncture resistance, and flexibility in cold conditions are desired. For medical-style tubing, the 2.5 MI grade supports uniform wall thickness at small dimensions, while higher-flow grades may be required when cycle time or very thin walls are the controlling production factor.
Film and tubing produced from EF528 intended for food-contact use should be evaluated for compliance under EU Regulation 10/2011 and, in the United States, the resin falls within the scope of food-contact ethylene-vinyl acetate copolymers under 21 CFR 177.1350. The regulation permits use in repeated-use and single-use food-contact articles, provided that the finished article’s overall migration test results meet the applicable limits and the resin supplier provides a declaration of compliance or equivalent documentation. Lot-specific CofA should be retained as part of the quality record.
For packaging applications in the European Union, the finished article is tested under the EN 1186 series for overall migration in food simulants. For medical or laboratory tubing, the resin itself is not a medical grade; suitability must be established through finished-device biological evaluation according to ISO 10993-1. Sterilisation mode and post-sterilisation physical integrity are part of the end-user validation.
Under REACH, the resin must be covered by a registration or exemption, and the absence of candidate-list substances of very high concern should be confirmed in the safety data sheet. Restricted substances under RoHS recast 2011/65/EU are not expected above threshold levels in this type of unstabilised EVA base resin, but testing of finished electronic accessories may be required under IEC 62321 methods. No phthalate plasticisers are required for flexibility because the vinyl acetate comonomer itself reduces rigidity.
EF528 may contain processing stabilisers and slip/antiblock additives depending on the intended film function. Additives that generate acidic or reactive intermediates, such as certain amine-based stabilisers, may interact with residual acetic acid during thermal processing and should be evaluated in advance. If the resin is supplied as a base polymer, formulators commonly add antioxidants approved under food-contact regulations at levels below 0.1 wt% to maintain thermal stability.
Incoming resin lots should be tracked for density and melt index because batch-to-batch variation can shift extrusion pressure and gauge control. A melt mass-flow rate deviation of ±0.5 g/10 min can be managed through screw speed adjustment, but larger deviations may require die-gap or temperature profile changes. VA content variation affects heat-seal initiation and film modulus more strongly; a change of 1 wt% VA may shift melting point by approximately 1–2°C, so exact composition control is important for converting consistency.
Occupational exposure during extrusion should be controlled with local exhaust ventilation because low-level acetic acid can form if melt temperature exceeds 220°C; this is detectable by odour and is a reliable process excursion indicator. Storage should be maintained in closed containers at temperatures below 35°C, away from direct sunlight and moisture; exposure to high humidity for more than 72 hours may increase surface moisture and affect film clarity unless pre-drying is reinstated.
Quality control should compare incoming lot melt index under ISO 1133-1:2022, vinyl acetate content under ISO 8985, and density under ISO 1183-1 with the supplier CofA. Drift in melt index beyond ±0.5 g/10 min or VA beyond ±0.5% within a production campaign can shift film gauge consistency and heat-seal performance, requiring adjustment of extruder speed or seal temperature. Published data for this specific configuration is limited; therefore, process capability studies on the actual line should be the basis for final control limits.
