🧩 EVAC – Ethylene-Vinyl Acetate Copolymer
(Soft, flexible, and weldable material, very close to EVA; used in gaskets, caps, insulation, and elastic automotive components for sealing and vibration damping.)
🔹 What is EVAC
EVAC (Ethylene-Vinyl Acetate Copolymer) is the technical and industrial form of the EVA material, featuring a controlled composition for precision applications. It is a thermoplastic copolymer made from ethylene (PE) and vinyl acetate (VA), where the VA content (10–40%) determines the degree of elasticity and clarity.
In the automotive industry, EVAC is used for gaskets, liners, caps, electrical protectors, and soft supports, due to its reliable adhesion and long-term elastic behavior.
🔧 Composition
- Ethylene (PE) – 60–80 %
- Vinyl Acetate (VA) – 20–40 %
- Additives – UV stabilizers, antioxidants, anti-static agents.
- Density: 0.93–0.96 g/cm³
- Melting Point: ≈ 85–100 °C.
- Shore A Hardness: 25–90 (depending on the formula).
🚗 Where EVAC is used in the automotive industry
| Component | Example parts | Observations |
| Gaskets & Caps | Sleeves, corners, mudguards | Elastic, watertight, anti-noise |
| Interior / Comfort | Pads, soft inserts, protections | Soft and vibration resistant |
| Exterior / Protections | Flexible caps, supports | Good cold and impact resistance |
| Electrical / Sensors | Insulation, tubes, electrical caps | Good dielectric, non-brittle |
🔧 Welding Temperature and Methods
| Method | Optimal Temperature | Observations |
| Hot Air | 230 – 250 °C | Clean and uniform weld |
| Heat Plate (Mirror) | 220 – 240 °C | Ideal for flat joints |
| Manual Extrusion | 210 – 230 °C | Recommended for high thicknesses |
🔩 What to Weld EVAC With (Material Compatibility)
The question “what to weld EVAC with” often arises for flexible automotive parts. EVAC, being an olefinic copolymer, welds very well with EVA, PE, and TPO.
✅ Compatible:
- EVAC ↔ EVAC – ideal combination.
- EVAC ↔ EVA / PE-LD / EBA / EMA – very good compatibility.
- EVAC ↔ TPO / POE – good compatibility.
❌ Incompatible:
- ABS, ASA, PC, PA, PVC – different melting points, no adhesion.
💡 ReplastMD Recommendation:
Use EVAC or EVA rods at a temperature of 240–250 °C with slow heating. Apply moderate pressure with a soft scraper for a full bond and smooth finish. For aesthetic areas, use a narrow nozzle for precise thermal control.
🏭 Manufacturers and Trade Names
- DuPont: Elvax® EVAC
- ExxonMobil: Escorene™ EVAC
- SABIC: EVAC Copolymer
- Dow: Elvaloy™ EVAC
- Arkema: Lotryl® EVAC
🧠 How to Identify EVAC
- Engraved marking: >EVAC<, >E/VA<, >PE-VA<, >ELVAX<.
- Soft, slightly rubbery, glossy surface.
- Yellow-blue flame, sweet-acetic smell.
- Softens completely at ≈ 240 °C, without bubbles.
- High elasticity and full recovery after deformation.
🛠️ EVAC Welding at ReplastMD:
At our service center in Chisinau (Ciocana sector), ReplastMD performs professional EVAC welding for:
- gaskets, caps, mudguards, and automotive corners;
- flexible protectors and insulators;
- aesthetic repairs without losing elasticity;
- clean, soft, and perfectly watertight finish.