Ethylene Vinyl Acetate, commonly abbreviated as EVA, is a copolymer of ethylene and vinyl acetate. It is known for its excellent adhesion, flexibility, toughness, and low-temperature properties. Melt index range from 6 – 800 gr/10 minutes. EVA is a versatile material used in various industries, mainly in the hotmelt adhesives industry due to its ease of processing and compatibility with a wide range of tackifier resins and additives such as waxes and in bitumen modification.
| Grade | VA Content | Melt Index | Break Point Tensile Strength | Hardness Shore A |
|---|---|---|---|---|
| UE 633 | 19 | 20 | 130 | 88 |
| UE 634-04 | 28 | 6 | 180 | 78 |
| UE 639-04 | 28 | 150 | 150 | 67 |
The choice of using EVA depends on specific application requirements, including flexibility, cushioning, and chemical resistance. Alternatives may include other thermoplastic elastomers like thermoplastic polyurethane (TPU) or styrene block copolymers (SBCs), depending on the desired characteristics and cost considerations. The selection is influenced by factors such as the operating environment, regulatory requirements, and the need for specific material properties. EVA is preferred when its unique combination of flexibility, shock absorption, and ease of processing aligns with the application’s needs, particularly in industries where these properties are critical, such as footwear and packaging.
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