EVA Material & Usage

EVA Plastic Resin

EVA (ethylene-vinyl acetate copolymer) plastic resin, abbreviated as EVA, refers to ethylene-vinyl acetate copolymer.
Technical Data Sheet Code: 1314
CAS No.: 24937-78-8
Molecular Formula: (C₂H₄)ₓ·(C₄H₆O₂)ᵧ

Basic Information

• Name: ethylene-vinyl acetate copolymer
• Raw Material: Ethylene-vinyl acetate copolymer
• Average Molecular Weight: 2000

Introduction

This grade exhibits strong adhesion to PE, EVA, and aluminum, with polyolefin-like properties. Additionally, it demonstrates excellent processability. EV-400 is primarily used as an adhesive resin in aluminum composite panels.

Chemical Properties

• Chemical Name (English): ethylene-vinyl acetate copolymer
• Abbreviation: EVA
• Technical Data Sheet Code: 1314
• CAS No.: 24937-78-8
• Density: 0.92–0.98 g/cm³
• Refractive Index: 1.480–1.510
• Brittleness Temperature: < -50°C
• Thermal Decomposition Temperature: 230–250°C
• Stability: Excellent chemical stability, UV resistance, and ozone resistance.
• Molecular Formula: (C₂H₄)ₓ·(C₄H₆O₂)ᵧ
• Average Molecular Weight: 2000

Health and Safety

• Health Hazards: May cause irritation to eyes and skin.
• Flammability/Explosion Risk: Flammable; has irritant properties.
• First Aid Measures:
  • Skin Contact: Remove contaminated clothing; rinse with running water.
  • Eye Contact: Lift eyelids; rinse with running water or saline solution. Seek medical attention.
  • Inhalation: Move to an area with fresh air. Seek medical attention.
  • Ingestion: Drink plenty of warm water; induce vomiting. Seek medical attention.

Key Features

1. Water Resistance: Closed-cell structure prevents water absorption, ensuring moisture resistance and excellent water repellency.
2. Corrosion Resistance: Resists corrosion from seawater, oils, acids, and alkalis. Non-toxic, odorless, and environmentally friendly.
3. Processability: Seamless and compatible with thermal pressing, cutting, gluing, and lamination.
4. Vibration Damping: High resilience and tensile strength provide superior shock absorption and cushioning.
5. Insulation: Excellent thermal insulation, cold resistance, and UV resistance.
6. Soundproofing: Closed-cell structure ensures effective noise reduction.

Typical Characteristics

• When the vinyl acetate content in EVA is below 20%, it can be used as a plastic.
• EVA (PA66) exhibits excellent low-temperature performance, with a thermal decomposition temperature of approximately 230°C.
• As molecular weight increases, the softening point rises, reducing processability and surface gloss but enhancing mechanical strength, impact resistance, and environmental stress crack resistance.
• Compared to PE and PVC, EVA has slightly inferior chemical and oil resistance, with differences becoming more pronounced as vinyl acetate content increases.

Performance Advantages Over PE:

• Improved elasticity, flexibility, gloss, and breathability.
• Enhanced environmental stress crack resistance.
• Better compatibility with fillers, allowing incorporation of additives to offset mechanical property declines.

Modification Methods:

1. Grafting: Use EVA as the backbone for grafting other monomers.
2. Partial Alcoholysis: Modify EVA through controlled hydrolysis.

Note: Ensure compliance with local safety regulations when handling EVA resins.