| Código SH | 670626 |
| Família Química | Copolímero de etileno e acetato de vinilo |
| Conteúdo De Acetato De Vinil | 18% |
| Taxa De Fluxo De Fusão 190c 2 16kg | 3 g /10min |
| Densidade | 0,938 g /cm³ |
| Ponto De Fusão | 85 ° C |
| Vicat Amolecimento Ponto | 63 ° C |
| Dureza Da Costa | 84 Shore A |
| Força De Tração Na Ruptura | 20 MPa |
| Alongamento Na Ruptura | 800% |
| Temperatura De Transição Vítrea | -30 ° C |
| Brittleness Temperatura | -70 ° C |
Como fábrica acreditada de Copolímero de acetato de vinilo de etileno ATEVA 2803W, aplicamos protocolos de qualidade rigorosos - cada lote é submetido a testes rigorosos para garantir padrões de eficácia e segurança consistentes.
| Embalagem | O copolímero de acetato de etileno e vinil ATEVA 2803W é fornecido como pellets de fluxo livre em sacos de papel multiparede de 25 kg para manuseio seguro. |
| Carga de contêiner (20' FCL) | Carregamento do recipiente FCL de 20 'para o copolímero ATEVA 2803W EVA, garantindo transporte seguro e eficiente e utilização ideal do espaço. |
| Envio | ATEVA 2803W (Copolímero de Etileno Vinil Acetato) é fornecido como pelotas de resina não perigosas. Proteja da umidade, luz solar direta e altas temperaturas. Use recipientes secos, limpos e ventilados. Mantenha as embalagens seladas para evitar contaminação. O manuseio padrão com controle de poeira é recomendado. Evite impactos ou perfurações durante o transporte. |
| Armazenamento | Armazene o copolímero de acetato de etileno e vinil ATEVA 2803W em uma área fria, seca e bem ventilada, longe da luz solar direta, fontes de calor e chamas abertas. Mantenha os recipientes bem fechados para evitar a absorção de umidade e contaminação. A temperatura de armazenamento recomendada é inferior a 30 ° C. Evite empilhamento excessivo para evitar deformação. Em condições adequadas, a vida útil é normalmente de 12 meses a partir da data de fabricação. |
| Prazo de validade | O prazo de validade é normalmente de 2 anos quando armazenado em embalagem original fechada em local fresco e seco, longe do calor e da luz solar. |
Preços competitivos Copolímero de acetato de vinilo de etileno ATEVA 2803W que se ajustam ao seu orçamento - termos flexíveis e orçamentos personalizados para cada pedido.
Para amostras, preços ou mais informações, entre em contato conosco em +8615380400285 Ou envie para sales2@liwei-chem.com.
Responderemos a você o mais rápido possível.
Telefone: +8615380400285
E-mail: sales2@liwei-chem.com
Pagamento flexível, preço competitivo, serviço premium - Consulte-nos agora!
ATEVA 2803W is an ethylene-vinyl acetate copolymer with a nominal vinyl acetate content of 28 wt% and a melt flow rate of 3 g/10 min when determined at 190 °C under a 2.16 kg piston load per ASTM D1238-20 and ISO 1133-1:2022. The grade belongs to the ATEVA EVA portfolio; the W suffix indicates a specific stabilizer and additive configuration, and lot-specific additive levels are documented in the supplier certificate of analysis. Base polymer density is near 0.950 g/cm³ by ASTM D1505. The vinyl acetate comonomer disrupts crystallinity in the polyethylene backbone, producing a low crystalline melting range, typically 70–80 °C by differential scanning calorimetry per ISO 11357-3, and reduced flexural modulus relative to lower-VA EVA grades. Tensile elongation at break in compression-molded specimens frequently exceeds 700% at 500 mm/min per ASTM D638-14, while Shore A hardness is commonly 75–80 per ISO 868. These values are nominal guide data and do not replace lot-specific quality testing.
| Property | Test method | Nominal value | Data status |
|---|---|---|---|
| Vinyl acetate content | ASTM D5594 | 28 wt% | Specification |
| Melt flow rate | ASTM D1238-20, 2.16 kg, 190 °C | 3 g/10 min | Specification |
| Density | ASTM D1505 | 0.950 g/cm³ | Nominal |
| Tensile strength at break | ASTM D638-14, 500 mm/min | 18–25 MPa | Typical |
| Elongation at break | ASTM D638-14, 500 mm/min | >700% | Typical |
| Shore A hardness | ISO 868 | 75–80 | Typical |
| Melting range | ISO 11357-3 | 70–80 °C | Typical |
| Vicat softening temperature | ASTM D1525, 10 N | 60–70 °C | Typical |
Thermal instability in EVA hot melt systems arises primarily from deacetylation of vinyl acetate segments. Sustained melt temperatures above 200 °C can liberate acetic acid, producing viscosity drift, corrosive vapor, and die-lip deposit formation. For hot melt formulations containing paraffin wax and rosin ester tackifier, the practical mixing window is typically 150–165 °C, and control within ±5 °C is required to prevent phase separation and wax skinning. Jacketed sigma-blade kneaders with scraped walls and nitrogen blanketing at 0.2–0.5 bar are commonly used to minimize oxidative yellowing. Addition of 2.5 wt% hydrocarbon resin can extend open time but reduces heat resistance; this trade-off should be evaluated by ring-and-ball softening point per ASTM E28-99 and Brookfield thermosel viscosity at 180 °C.
Tackifier compatibility is not uniform across resin chemistries. Rosin esters generally show better clarity and lower cloud point with 28 wt% VA EVA than aliphatic hydrocarbon resins, while aromatic-modified hydrocarbon resins can increase high-temperature adhesion at the expense of melt color. Migration kinetics in polymer matrices require evaluating glass transition shift by differential scanning calorimetry or visual clarity after 24 h at 150 °C. Formulations intended for low-temperature adhesion should be screened below −10 °C because paraffin wax crystallization can create brittle failure surfaces even when the base EVA remains flexible.
Twin-screw compounding of ATEVA 2803W uses barrel profiles from 120 °C to 180 °C with screw speeds between 200 rpm and 400 rpm on corotating extruders with L/D ratios of 30:1 to 40:1. Vacuum venting at −0.08 MPa removes residual moisture and trace acetic acid. Feed throat temperature should not exceed 50 °C, and screw compression ratio is typically held between 2.5:1 and 3.5:1 to limit shear heating. The copolymer is not hygroscopic, but condensation on cold pellets entering a warm plant at relative humidity above 60% can introduce surface moisture; a desiccant dryer at 50–60 °C for 2–4 h is advised under such conditions.
Compared with an 18 wt% vinyl acetate EVA, ATEVA 2803W exhibits higher polarity, stronger adhesion to aluminum foil, polyester film, and polar paper coatings, and a lower crystalline melting range. The reduced crystallinity lowers flexural modulus and improves low-temperature flexibility; however, it also reduces upper service temperature and can increase blocking in thin films. Compared with high-MFR EVA grades such as 400 g/10 min hot melt grades, ATEVA 2803W provides higher melt viscosity and higher cohesive strength at ambient temperature, but it requires higher processing temperatures or added wax to achieve the same coating weight. The grade therefore occupies a middle-viscosity position: low enough for compounding and profile extrusion, high enough for heat resistance in adhesive joints.
| Comparison basis | ATEVA 2803W | Representative low-VA EVA | Representative high-MFR EVA |
|---|---|---|---|
| Vinyl acetate content | 28 wt% | 18 wt% | 28 wt% |
| Melt flow rate | 3 g/10 min | 7–10 g/10 min | 400 g/10 min |
| Melt viscosity at compounding temperature | Moderate-high | Moderate | Low |
| Polar substrate adhesion | High | Moderate | High but low cohesive strength |
| Crystalline melting range | 70–80 °C | 85–95 °C | 70–80 °C |
| Upper heat resistance in adhesive joints | Moderate | Higher | Lower |
Direct substitution of lower-VA EVA with ATEVA 2803W in extrusion coating reduces melt temperature settings and improves adhesion to aluminum foil, but it can lower heat seal initiation temperature and may require antiblock modification. Compared with metallocene polyolefin elastomers, the polar acetate groups provide ink adhesion and paintability but reduce thermal oxidative stability and restrict processing temperature. Published data for this specific configuration is limited; pilot-line validation on a 40 kg/h flat-die coextrusion line is recommended before commercial replacement.
For wire and cable or footwear foam formulations, blowing agent decomposition kinetics should be matched to the 70–80 °C melting range. Azodicarbonamide-based foaming systems can be activated at 160–180 °C; melt viscosity in that range remains sufficient for cell morphology if expansion ratio remains below 2.0. Published data for ATEVA 2803W in high-expansion foam is limited, so process development should be conducted on laboratory twin-roll mills or small-batch internal mixers before scale-up.
Extrusion coating lines processing this grade should use barrel settings from 120 °C to 180 °C and a flat die temperature of 180–190 °C. At line speeds above 150 m/min, draw resonance and edge neck-in should be evaluated on the specific die; because melt strength of 28 wt% VA copolymer is lower than that of LLDPE, air gap is typically reduced to 10–20 cm. Injection molding melt temperatures should not exceed 200 °C, with mold temperature maintained at 20–40 °C. Clamp force requirements depend on melt flow length, but the moderate viscosity does not require the high injection pressures typical of filled engineering thermoplastics.
Combining the grade with amine-based stabilizers or strongly alkaline fillers is not recommended; such additives can catalyze ester hydrolysis and accelerate deacetylation. Peroxide crosslinking is possible, but cure rate and scorch time must be established by moving die rheometry per ISO 6502 or ASTM D5289-19a. Because vinyl acetate increases polarity, storage stability in humid environments is acceptable if pellets remain sealed, but prolonged exposure to direct sunlight may induce surface oxidation and should be avoided.
Moisture uptake is not the primary storage concern for ATEVA 2803W; rather, condensation during cold-to-warm transfer at relative humidity above 60% can create surface moisture and minor melt pressure fluctuation. Pellets should be stored in sealed packaging below 40 °C and protected from UV exposure. When bulk handling equipment is used, line purging with dry air at −20 °C dew point reduces condensation in hopper-car unloading. Lot-to-lot melt flow rate variation should be tracked for critical hot melt formulations, with incoming inspection per ASTM D1238-20 recommended before use in automated adhesive lines.
Regulatory compliance must be confirmed with the supplier for the specific stabilizer package. The base ethylene-vinyl acetate polymer falls under FDA 21 CFR 177.1350 for food contact clausure only when the additive package and total extractives satisfy the applicable limitations. EU food contact status should be evaluated under EU 10/2011. REACH SVHC status and RoHS 2011/65/EU compliance should be documented through supplier declaration because additive composition varies by suffix designation. These boundary conditions are operational, not exhaustive; process qualification on production equipment is required before specifying ATEVA 2803W in a regulated article.
