| Código SH | 499766 |
| Conteúdo De Acetato De Vinila | 19% em peso |
| Vazão De Fusão 190 C 2 16kg | 3,0 g /10 min |
| Densidade | 0,94 g /cm³ |
| Ponto De Fusão Dsc | 85 ° C |
| Temperatura De Amolecimento De Vicat | 62 ° C |
| Resistência à Tracção | 17 MPa |
| Alongamento Na Ruptura | 700% |
| Módulo Flexural | 35 MPa |
| Dureza Shore A | 88 |
| Dureza Shore D | 38 |
| Temperatura De Fragilidade | -75 ° C |
| Temperatura De Transição Vítrea | -40 ° C |
Como fábrica acreditada de Copolímero de acetato de vinilo de etileno ELVAX 3190, 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 ELVAX 3190 é embalado como pellets em sacos de papel multiparede de 25 kg para manuseio seguro. |
| Carga de contêiner (20' FCL) | Copolímero ELVAX 3190 EVA embalado em sacos paletizados, carregado como 20 'FCL, protegido para transporte seguro. |
| Envio | ELVAX 3190 é enviado como pellets sólidos em sacos de papel de várias paredes ou FIBCs, paletizados e embalados para proteção contra umidade. Não é perigoso sob os regulamentos de transporte. Armazene em uma área fria e seca, longe de fontes de calor e luz solar direta, evitando aglomeração e degradação durante o trânsito. |
| Armazenamento | Armazene o copolímero de acetato de etileno e vinil ELVAX 3190 em uma área fria, seca e bem ventilada, longe da luz solar direta, fontes de calor e agentes oxidantes. Mantenha os recipientes bem fechados para evitar umidade, poeira e contaminação. Evite criar poeira no ar; use aterramento adequado para evitar descarga estática. Siga as diretrizes do fabricante para vida útil e manuseio. |
| Prazo de validade | O prazo de validade é de dois anos a partir da data de fabrico, quando armazenado em recipientes de origem fechados nas condições recomendadas. |
No conjunto de fusão a quente sem solvente para fechamento de caixas e caixas, o ELVAX 3190 é introduzido em 18-30% em peso do composto adesivo para equilibrar a resistência à flexão a frio contra o controle em tempo aberto. O conteúdo de acetato de vinilo do copolímero 25% em peso e o índice de fusão 2,0 g/10 min medidos sob ISO 1133-1:2022 a 190°C/2,16 kg colocam-no no segmento de polaridade média para adesão a cartão revestido, material revestido com argila e filmes de polietileno. Um ponto de partida típico de selagem de caixa ondulada emparelha o copolímero com 35-50 partes de hidrocarboneto hidrogenado pegajoso e 15-25 partes de parafina ou cera microcristalina por 100 partes EVA; a viscosidade do adesivo acabado é mantida entre 900–1.800 mPa·s a 175°C quando avaliada por ASTM D3236-15, enquanto o ponto de amolecimento de anel e bola é controlado a 95–110°C sob ASTM E28-18. A adesão de T-peel ao Kraft ondulado é medida de acordo com ASTM D1876-08(2023) a 300 mm/min velocidade transversal, com níveis de passagem estabelecidos pelo peso da caixa e porosidade da placa em vez de um único limiar universal. A produção contínua em extrusoras de duplo parafuso co-rotativas com L/D 30:1 ou misturadores de âncora de alto cisalhamento com raspadores de parede é executada a 140-170°C; a falha de produção mais frequente é a fuga térmica na zona de vedação de fusão quando as temperaturas do barril excedem 185°C, causando liberação de ácido acético da clivagem do acetato de vinil, deslocamento de viscosidade e escurecimento que não pode ser corrigido por antioxidante adicional sozinho. Pellets de EVA em bruto são especificados em 0,1% umidade máxima para limitar a hidrólise em temperaturas de fusão acima de 170 ° C; uma purga de nitrogênio no espaço da cabeça do misturador reduz a formação da pele superficial e o transporte de carvão. Para aplicações em caixas alimentares, o adesivo é usado sob as disposições de contato indireto com alimentos da FDA 21 CFR 175.105, enquanto a FDA 21 CFR 177.1350 só se aplica quando o adesivo é um componente de uma camada de contato com alimentos acabada. Os produtos terminais incluem caixa ondulada e fechamento de caixa de cartão, adesivos de ligação de livros, ligação de espuma e fusões quentes de etiquetas de baixa hemorragia.
Preços competitivos do Copolímero de acetato de vinilo de etileno ELVAX 3190 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.
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Pagamento flexível, preço competitivo, serviço premium - Consulte-nos agora!
ELVAX 3190 ethylene vinyl acetate copolymer is a random thermoplastic copolymer of ethylene and 25 wt% vinyl acetate. The grade is supplied in pellet form and is specified by a melt flow rate of 2.0 g/10 min measured at 190 °C under a 2.16 kg load in accordance with ASTM D1238 and ISO 1133-1:2022. The nominal density is 0.95 g/cm³ when tested under ASTM D1505. These coordinates place the material in the medium-vinyl-acetate, low-melt-flow region of the ELVAX grade slate. That combination is selected for hot-melt adhesives, wax modification, sealants, and polymer compounding where polar adhesion and cohesive strength are more important than very low melt viscosity.
Vinyl acetate comonomer disrupts polyethylene crystallinity, lowering the crystalline melting peak, increasing polarity, and improving compatibility with rosin ester and hydrocarbon tackifier resins. These changes appear as reduced heat-seal initiation temperature and enhanced wetting on polar substrates such as aluminum, poly(ethylene terephthalate), and primed paper. Because the resin contains no carboxylic acid groups, the adhesion mechanism differs from acid-modified ethylene copolymers and is not dependent on ionic neutralization.
At 25 wt% vinyl acetate, ELVAX 3190 has a lower melting peak and lower flexural stiffness than extrusion-grade EVA copolymers containing 9–18 wt% vinyl acetate. The higher polar comonomer concentration increases the solubility parameter of the polymer phase, which promotes interaction with polar tackifiers and metal oxide surfaces but also increases water vapor transmission and reduces resistance to nonpolar solvents. In heat-seal applications, the reduction in crystallinity lowers the seal initiation temperature by approximately 10–20 °C relative to an 18 wt% vinyl acetate copolymer of comparable melt flow. Exact values depend on seal dwell time, pressure, and film gauge.
Compared with acid-functionalized ethylene copolymers, ELVAX 3190 does not contain carboxylic acid functionality. Adhesion to aluminum foil and polyester film therefore arises from polar vinyl acetate dipole interactions rather than ionic or acid-base bonding. This distinction is operationally significant in formulations containing amine-based tackifiers or fillers that could neutralize acid groups; the neutral copolymer does not undergo the same acid-catalyzed ring-opening reactions with epoxy resins.
Against hot-melt grades with 28–33 wt% vinyl acetate and melt flow rates above 25 g/10 min, ELVAX 3190 exhibits lower melt flow, higher molten viscosity, longer open time, and higher cohesive strength at equivalent coating weight. Those properties are advantageous in profile wrapping, edge banding, and slower assembly operations; they are disadvantageous in high-speed noncontact spiral spray or fiberization where low melt viscosity is required. Grade selection between ELVAX 3190 and a higher-flow EVA should therefore be based on application temperature, wet-out time, and coating head geometry.
| Parameter | ELVAX 3190 | Low-VA extrusion class representative | High-VA high-MFR hot-melt class representative |
|---|---|---|---|
| Vinyl acetate content | 25 wt% | 18 wt% | 28 wt% |
| Melt flow rate at 190 °C/2.16 kg | 2.0 g/10 min | 2.5 g/10 min | 25 g/10 min |
| Adhesion to polar surfaces | Higher than low-VA class | Lower than ELVAX 3190 | Higher than ELVAX 3190 |
| Melt viscosity and open time | Higher melt viscosity, longer open time | Similar melt viscosity, lower tack | Lower melt viscosity, shorter open time |
The low-VA and high-VA columns are generalized industrial EVA categories for comparison and do not correspond to a named commercial grade.
The following table consolidates representative values from the manufacturer’s published technical data. Values are typical and should not be used as release specifications without reviewing a certificate of analysis for the specific lot.
| Property | Test protocol | Typical value |
|---|---|---|
| Vinyl acetate content | Manufacturer FTIR internal method | 25 wt% |
| Melt flow rate | ASTM D1238 /ISO 1133-1:2022, 190 °C, 2.16 kg | 2.0 g/10 min |
| Density | ASTM D1505 | 0.95 g/cm³ |
| DSC melting endotherm peak | ASTM D3418 | approximately 76 °C |
Because the melt flow rate is nominally 2.0 g/10 min, the melt is relatively viscous for hot-melt operations. In a gear-pump-assisted slot die, changes in melt flow rate of 0.2–0.3 g/10 min between production lots can shift pump discharge pressure and coat weight stability. Lot-to-lot viscosity variation should be monitored via ISO 1133-1:2022 and matched to line calibration. Published mechanical data for neat compression-molded specimens in specific end-use film geometries is limited; designers should generate application-specific peel, shear, and tensile data according to ASTM D1876 and ASTM D638-14 rather than relying on resin-only values.
Under ASTM D3418, the melting endotherm is broad and shifted to lower temperature relative to polyethylene homopolymer. The reduction in crystallinity decreases tensile modulus and increases elongation at break, but the exact mechanical response depends on specimen preparation and thermal history. Annealed specimens show higher crystallinity than quenched specimens, so comparative data must be generated under controlled cooling rates. The density of 0.95 g/cm³ is higher than low-density polyethylene because vinyl acetate contributes mass and polarity. This density should be used in gravimetric feeding and inventory calculations; bulk density of pellets may be different and should be measured for silo design.
When ELVAX 3190 is compounded into hot-melt adhesives, the resin is normally let down with tackifier and wax in a heated mixer or 40:1 L/D co-rotating twin-screw extruder. Barrel temperatures are profiled from 120 °C in the feed zone to 160 °C at the die to limit heat history. Processing at the high end of the range improves wet-out but shortens thermal lifetime; residence time at melt temperature in batch mixers should be limited to 30–45 minutes.
Typical hot-melt formulations use 20–40 wt% ELVAX 3190, 30–50 wt% tackifier, and 10–30 wt% paraffin or Fischer-Tropsch wax. The wax addition lowers formulation viscosity and shortens set time, while the EVA provides cohesive strength and peel adhesion. For slot-die coatings, line speeds of 30–150 m/min are attainable only after viscosity adjustment. For spiral spray, the formulation viscosity at 175 °C is often reduced below 2 Pa·s by using higher wax loadings or adding a higher-MFR EVA grade. Viscosity measurements should follow ASTM D3236 for hot-melt adhesives.
Tackifier compatibility is not unlimited. Aliphatic hydrocarbon resins with low polarity may phase-separate from the vinyl acetate-rich phase, causing haze and loss of peel strength. Rosin esters and aromatically modified hydrocarbon resins generally show better compatibility with 25 wt% vinyl acetate; the selection should be confirmed by measuring glass transition temperature and peel adhesion after 7 days at 40 °C.
Adhesion failures on production lines are frequently caused by inadequate substrate preheating rather than by resin properties. When applied to aluminum foil at coat weights below 20 g/m², the molten film can freeze before wetting. Heated nip rolls set at 40–60 °C are used to maintain contact and improve peel adhesion measured by ASTM D1876. On converting lines, lot-to-lot variations in melt flow rate should be recorded against coat weight and pump speed. A lot shift of 0.2 g/10 min can change the pressure drop across a slot die and produce visible streak defects if the die temperature is not trimmed.
Compounding of ELVAX 3190 into paraffin and microcrystalline waxes is carried out at loadings of 3–15 wt% to harden wax, reduce crystal size, and improve adhesion to kraft paper and corrugated board. In asphalt and modified-bitumen roofing compounds, the copolymer acts as a polymeric modifier that increases softening point and low-temperature flexibility when blended at levels of 5–12 wt%; published data for specific asphalt source compatibility is limited because bitumen composition varies by crude source and oxidation level.
Sealant formulations using ELVAX 3190 often combine the resin with polyisobutylene, butyl rubber, or tackifying resins. The 25 wt% vinyl acetate content improves adhesion to glass and coated metal. The material has no reactive silane functionality; for moisture-curing sealants it must be blended with silane-grafted polymers or used as a non-crosslinked component. In solvent-borne sealants, the resin is dissolved in toluene or xylene at solids levels of 20–40 wt%; final viscosity is controlled by solvent selection and resin concentration.
Food-contact status for ELVAX 3190 is governed by FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers. The resin may be used as a component of articles intended for food contact provided that the finished article meets the extraction limitations and end-use conditions described in the regulation. For the European market, compliance is assessed under EU Regulation (EU) No 10/2011 as amended, with overall migration testing performed according to EN 1186 or equivalent. The unfilled resin is not formulated with intentionally added lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers; conformity with RoHS Directive 2011/65/EU Annex II should be documented by the supplier for each lot.
REACH registration status and candidate list content should be confirmed through the safety data sheet. The absence of phthalate plasticizers and bisphenol A in the base polymer does not exempt a converted article from substance-specific restrictions if the formulation includes external plasticizers, tackifiers, or colorants.
Thermal processing of ELVAX 3190 is constrained by the onset of vinyl acetate deacetylation at approximately 230 °C. Above this threshold, acetic acid is evolved, melt viscosity drifts, gel particles may form, and carbon steel process components are subject to accelerated corrosion. Extruder vent ports should be connected to acid-resistant vacuum lines, and melt temperature sensors should be positioned near the die to detect shear-induced temperature overshoot. The recommended melt temperature for extended runs is 160–180 °C; short excursions to 190 °C are tolerated, but residence time above 200 °C should be minimized.
Pre-drying is required when pellet surface moisture exceeds 0.05 wt% or when packaging has been exposed to relative humidity above 60%. Drying in a desiccant dryer at 60–70 °C for 4–6 hours reduces bubbles and surface defects in extrudate. The resin should be kept away from strong oxidizing agents and chlorinated solvents. In compounding, amine-based additives should be evaluated separately because they can function as deacetylation catalysts or form acetate salts that affect color and adhesion.
Processors should not combine ELVAX 3190 with highly basic fillers such as sodium hydroxide or calcium oxide at melt temperatures; these materials can accelerate ester cleavage and embrittle the final compound. Process vent condensate should be treated as dilute acetic acid and handled in corrosion-resistant scrubbers or waste-treatment systems.
