⟡ EVA Copolymers / Thermoplastic Polymers
Poly(ethylene/vinyl acetate) [72:28 (wt)]
Poly(ethylene-co-vinyl acetate) (EVA) [72:28 (wt)] is a thermoplastic copolymer composed of approximately 72 wt% ethylene and 28 wt% vinyl acetate. This composition provides a balance of flexibility, toughness, adhesion, and processability, making EVA useful across coating, adhesive, film, and polymer modification applications.
The vinyl acetate content reduces crystallinity relative to polyethylene, improving softness, low-temperature flexibility, and compatibility with other formulation components. At the same time, the higher ethylene fraction maintains cohesive strength and durability. This grade also contains approximately 500 ppm BHT antioxidant for improved processing stability.
Key Features & Benefits
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72:28 ethylene-to-vinyl acetate ratio: balances flexibility and mechanical strength
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Thermoplastic EVA copolymer: suitable for melt processing and polymer blending
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Improved flexibility: lower crystallinity compared to polyethylene
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Good adhesion properties: useful in hot-melt and pressure-sensitive systems
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Low-temperature toughness: maintains flexibility under demanding conditions
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Contains ~500 ppm BHT antioxidant: supports thermal and oxidative stability during processing
Product Details
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Product name: Poly(ethylene/vinyl acetate) [72:28 (wt)]
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Common abbreviation: EVA
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Composition: ~72 wt% ethylene / ~28 wt% vinyl acetate
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Polymer type: Thermoplastic copolymer
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Additive: ~500 ppm BHT antioxidant
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Function: Flexible polymer, binder, modifier
Typical Applications
Hot-melt adhesives and sealants
EVA is widely used in adhesive systems due to its flexibility, cohesive strength, and compatibility with tackifiers and waxes.
Polymer modification and blending
Used to modify flexibility, toughness, and impact resistance in polymer formulations and composite systems.
Flexible films and packaging materials
The balance of softness and durability makes EVA useful in film applications requiring flexibility and sealability.
Foams and cushioning materials
EVA copolymers are commonly incorporated into lightweight cushioning and shock-absorbing materials.
Precursor to poly(vinyl alcohol) systems
EVA can serve as a precursor material in the production of poly(vinyl alcohol)-related chemistries through hydrolysis processes.
Functional Role
This EVA copolymer functions as a flexible thermoplastic modifier and binder. Ethylene segments contribute structural integrity and toughness, while vinyl acetate units reduce crystallinity and improve elasticity, adhesion, and compatibility with other materials. The resulting balance of properties makes EVA suitable for formulations requiring both flexibility and durability.
Why Vinyl Acetate Content Matters
The ratio of ethylene to vinyl acetate significantly influences EVA performance. Increasing vinyl acetate content generally improves flexibility, softness, adhesion, and optical clarity while reducing stiffness and crystallinity. At 28 wt% vinyl acetate, this grade offers a balanced property profile suitable for adhesive, film, and modification applications.
For a broader overview of how polymer composition influences performance, see our polymer molecular weight selection guide.
Handling & Storage
- Store in a cool, dry environment away from excessive heat.
- Keep container tightly sealed when not in use.
- Avoid prolonged exposure to strong oxidizing conditions.
- Consult the SDS for detailed handling and safety information.
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FAQ
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What is EVA polymer used for?
EVA is used in adhesives, flexible films, foams, sealants, and polymer modification applications where flexibility and toughness are important.
What does 72:28 mean in EVA?
It refers to the approximate weight ratio of ethylene to vinyl acetate in the copolymer.
How does vinyl acetate affect EVA properties?
Higher vinyl acetate content generally increases flexibility, softness, adhesion, and compatibility while reducing crystallinity and stiffness.
Is EVA flexible?
Yes. EVA is valued for its flexibility, elasticity, and low-temperature toughness compared to standard polyethylene.
Why is BHT included?
BHT acts as an antioxidant to help improve thermal and oxidative stability during storage and processing.
