| Código SH | 168146 |
| Conteúdo De Va Em | 40 |
| Densidade G Cm³ | 0,97 |
| Vazão De Fusão G 10min | 65 |
| Shore A Hardness Tradução | 40 |
| Resistência à Tração Mpa | 10 |
| Alongamento Na Ruptura | 900 |
| Ponto De Fusão C | 68 |
| Ponto De Amolecimento Vicat C | 45 |
| Temperatura De Fragilidade C | -70 |
| Temperatura De Transição Vítrea C | -30 |
Como uma fábrica acreditada EVAFLEX 40W EVA resina de copolímero, ≥40% VA, alta qualidade de elastómero, aplicamos protocolos de qualidade rigorosos - cada lote é submetido a testes rigorosos para garantir padrões de eficácia e segurança consistentes.
| Embalagem | A resina EVAFLEX 40W EVA é fornecida em sacos de papel de parede múltipla de 25 kg com forro de polietileno, paletizados e embalados em retrátil. |
| Carga de contêiner (20' FCL) | FCL de 20 "carregado com sacos de resina EVAFLEX 40W paletizados, presos com esterilização, protegidos contra umidade e contaminação. |
| Envio | A resina EVAFLEX 40W EVA é transportada como pellets sólidos em sacos ou tambores à prova de umidade, paletizados para um manuseio seguro. Armazene longe de fontes diretas de calor e ignição; mantenha seco. Não é perigoso para o transporte, mas use precauções industriais padrão para evitar o acúmulo de poeira e danos mecânicos durante o carregamento e o trânsito. |
| Armazenamento | Guarde o EVAFLEX 40W em uma área fria, seca e bem ventilada, longe da luz solar direta, calor e fontes de ignição. Mantenha os recipientes bem fechados para evitar absorção de umidade e contaminação. Evite o acúmulo de poeira; use aterramento adequado ao manusear. Nessas condições, a resina EVA de alto elastômero permanece estável por até dois anos a partir da entrega. |
| Prazo de validade | Prazo de validade: 2 anos a partir da data de fabricação, quando armazenado fechado, em local fresco e seco, longe do calor e da luz solar direta. |
Competitivo EVAFLEX 40W EVA resina de copolímero, ≥40% VA, preços de alta qualidade de elastómero que se encaixam no 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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E-mail: sales2@liwei-chem.com
Pagamento flexível, preço competitivo, serviço premium - Consulte-nos agora!
EVAFLEX 40W is an ethylene-vinyl acetate copolymer resin designated as a high elastomer grade. The vinyl acetate content is specified at ≥40 wt%, measured by Fourier-transform infrared spectroscopy according to ASTM D5594-18. This compositional threshold moves the resin away from semicrystalline polyethylene behavior and toward an amorphous, rubber-like response. The material is supplied in pellet form for compounding, adhesive formulation, flexible profile extrusion, impact modification, and selected halogen-free cable compounds. Density determined under ISO 1183-1:2019 for commercial 40 wt% VA copolymers typically falls within 0.96–0.98 g/cm³; the lot-specific value is reported on the certificate of analysis. Melt mass-flow rate is determined under ISO 1133-1:2022 at 190 °C with a 2.16 kg load and must be confirmed for EVAFLEX 40W before barrel temperatures, screw speed, and downstream tooling are fixed.
In lot-release documentation, vinyl acetate content is the primary compositional control point because a shift of 2 wt% VA at this loading can alter Shore hardness by 3–5 points and change the low-temperature stiffening behavior. The polar acetate group also increases equilibrium moisture uptake. When storage relative humidity exceeds 60%, pre-drying is required. A residual moisture target of <0.05 wt% is commonly applied before melt processing using desiccant dryers at 60–70 °C for 2–4 h. Published data for the exact EVAFLEX 40W lot may vary; the drying time should be triggered by measured moisture rather than fixed timer alone.
At 40 wt% vinyl acetate, the regular ethylene sequences in the copolymer are interrupted frequently enough that lamellar polyethylene crystallization is strongly suppressed. Differential scanning calorimetry according to ISO 11357-3:2018 commonly shows a broad melting endotherm with peak temperature below 70 °C and a glass transition near or below −30 °C for this VA class. The resin therefore exhibits low room-temperature modulus and pronounced recovery after deformation. Class-level published data for comparable 40 wt% VA copolymers indicate Shore A hardness values of 65–80 under ASTM D2240-15, tensile strength at break of 4.5–9.0 MPa under ISO 527-2:2012, and elongation at break of 700–1000%. These ranges describe the property envelope for the VA class and are not a substitute for EVAFLEX 40W lot-specific certificates.
The comparison below is based on class-level industrial data. In applications where stiffness, creep resistance, and upper service temperature are dominant, lower-VA grades are generally preferred. Where low-temperature flexibility, polar adhesion, and high filler acceptance are dominant, the 40 wt% VA class is used.
| Property | Test method | EVAFLEX 40W class | 18 wt% VA EVA class | POE elastomer class |
|---|---|---|---|---|
| Hardness | ASTM D2240-15 | 65–80 Shore A | 30–45 Shore D | 60–90 Shore A |
| Tensile strength | ISO 527-2:2012 | 4.5–9.0 MPa | 15–25 MPa | 5–15 MPa |
| Elongation at break | ISO 527-2:2012 | 700–1000% | 600–800% | 500–900% |
| Brittleness temperature | ASTM D746-20 | <−70 °C | −30 to −50 °C | <−70 °C |
| Polar adhesion to metal and filler surfaces | No single standard | Higher | Lower | Lower |
Compared with a 14 wt% VA grade, EVAFLEX 40W has higher polarity, lower crystalline melting onset, and greater chain mobility. The penalty is a lower upper service temperature and higher gas permeability. Oxygen transmission of a 40 wt% VA film is above that of an 18 wt% VA film when measured under ISO 15105-2. Water vapor transmission rate under ISO 15106-2 also increases as VA content rises. These differences must be considered before substitution in barrier packaging or electronic encapsulation.
On a corotating twin-screw extruder with 40:1 L/D ratio, EVAFLEX 40W should be introduced through the main throat rather than a side feeder. Because the resin softens at lower temperatures than LDPE, a reverse temperature profile is frequently used: feed zone 120–140 °C, barrel sections 2–4 140–160 °C, and die adapter 130–150 °C. Screw speed is commonly limited to 200–400 rpm, but specific torque input must be monitored because shear heating can drive melt temperature above 180 °C even with barrel set points inside the recommended range. If melt temperature exceeds 210 °C, vinyl acetate begins to release acetic acid, which can corrode nitrided barrel surfaces and increase gel particles. Vacuum venting at −0.08 MPa to −0.05 MPa gauge is applied downstream of the mixing section to remove residual moisture and degradation volatiles. Production-scale failure modes reported for similar high-VA copolymers include vent clogging from low-molecular-weight acetate condensate and screw slippage when the feed zone is too cold; both are corrected by raising feed throat temperature and cleaning the vent port after each 8 h run.
The practical melt temperature window is narrower than that of lower-VA EVA because the gap between softening and deacetylation narrows as VA content rises. A working range of 130–190 °C is commonly cited for the 40 wt% VA class, but published data for the exact EVAFLEX 40W grade is limited. The die adapter should therefore be fitted with a melt-temperature probe, and an alarm should be set at 200 °C. Single-screw extrusion of the neat resin generally uses a barrier screw with an L/D of 24:1 to 30:1 and a melt pump to reduce pulsation. For injection molding, barrel settings of 120–170 °C and mold temperatures of 20–40 °C are typical, but gate size and cooling time must be adjusted because the resin retains low modulus during cooling.
Hot-melt adhesive formulations use EVAFLEX 40W for its capacity to accept high tackifier and wax loadings without crystallizing. Apparent viscosity is measured under ASTM D3236-15 at 180 °C to control batch-to-batch variation. Blend ratios with hydrocarbon tackifiers commonly range from 30/70 to 70/30 by mass. Because EVAFLEX 40W has lower heat resistance than lower-VA EVA, open time and creep resistance must be tested at the final application temperature. Peel adhesion on aluminum and polyethylene is evaluated according to ASTM D1876-08; published data for this specific resin configuration is limited and must be generated on the actual production substrate.
In halogen-free flame-retardant cable compounds, the resin is combined with aluminum trihydroxide or magnesium dihydroxide at filler loadings between 60 wt% and 75 wt%. The resulting compound is evaluated under ISO 4589-2:2017 for limiting oxygen index and under IEC 60811-1-1 or ISO 527-2:2012 for tensile properties. High filler loading reduces melt flow; therefore a two-stage mixing process on a 36:1 L/D twin-screw extruder with side feeder at barrel zone 5 is used. After aging in a forced-air oven at 100 °C for 7 days, the high-VA phase is more susceptible to thermo-oxidative hardening than lower-VA grades, so hindered phenol/phosphate antioxidant packages are required. The polar acetate group contributes to filler wetting, but the resin should not be processed with high levels of zinc stearate because free acetate species can react to form zinc acetate, which promotes ester pyrolysis.
Regulatory assessments under EU REACH Regulation (EC) No 1907/2006 and EU RoHS Directive 2011/65/EU apply to the supplied article, not to the neat resin alone. If the resin is intended for food-contact articles, the finished article must comply with FDA 21 CFR 177.1520 or Commission Regulation (EU) No 10/2011, including overall migration and specific migration limits. EVAFLEX 40W should not be melt-blended with amine-based additives at elevated temperature because amine acceleration of deacetylation can produce color formation and acidic volatiles. When peroxide crosslinking is required, gel content after cure is measured by solvent extraction according to ASTM D2765-16, and peroxide dosage should be adjusted because the acetate side-reactions consume radical species.
Compared with 28 wt% VA encapsulant resins, EVAFLEX 40W gives lower elastic modulus but higher melt tack. It is therefore not automatically interchangeable in photovoltaic encapsulant formulations where creep resistance, gel content, and optical transmission under ASTM D1003-21 are controlled. The higher VA content also increases water vapor and oxygen permeability relative to 18 wt% VA films, as measured under ISO 15106-2 and ISO 15105-2. Conversely, the resin permits higher filler and colorant loading and better low-temperature impact retention in flexible compounds. For injection-molded flexible grips, cooled tooling at 20–40 °C is used to reduce cycle time, while tensile and elongation properties are confirmed on standard specimens according to ISO 527-2:2012.
