🧩 PET-G – Glycol-Modified Polyethylene Terephthalate
PET-G is a transparent, impact-resistant, and easy-to-process material obtained by modifying standard PET with glycol to reduce brittleness and increase flexibility. PET-G offers optical clarity, chemical resistance, and high impact strength, being used in transparent housings, covers, frames, and decorative components in the automotive and technical industries.
🔹 What is PET-G PETG (Polyethylene Terephthalate Glycol) is a thermoplastic copolyester. This modification:
- prevents rapid crystallization of the PET,
- makes it more malleable and impact-resistant,
- allows processing at lower temperatures (230–250 °C) without deformation. It is very popular in modern automotive applications where a clear, smooth, and durable finish is desired—similar to acrylic (PMMA), but more flexible.
🔧 Composition and Properties
- Composition: 90–95 % PET, 5–10 % Glycol modifier.
- Density: 1.25–1.30 g/cm³.
- Melting Point: ≈ 230 °C.
- Chemical Resistance: Excellent (oils, detergents, mild solvents).
- Continuous Thermal Resistance: 80–100 °C.
🚗 Automotive Applications
- Decorative Interior: Transparent frames, diffusers, illuminated covers (high gloss).
- Technical Housings: Transparent protectors, sensor covers (high impact).
- Panels / Protectors: Small shields, protective windows (good shock and vibration resistance).
- Display Parts: LED panels, protective screens (transparency and quality finish).
🔧 Welding Temperature and Methods
- Hot Air: 240 – 260 °C (uniform melting, avoids air bubbles).
- Heat Plate: 230 – 250 °C (clean joint, no whitening).
- Manual Extrusion: 230 – 250 °C (suitable for thick parts).
🔩 Welding Compatibility
- ✅ Compatible: PET, PETG, PBT, PBT+PET, PC+PET, PMMA+PETG.
- ✅ Good compatibility: PC, PC+PBT, ASA+PMMA.
- ❌ Incompatible: PP, PE, PS, PA, PVC.
💡 ReplastMD Recommendation: Use PETG or PET welding rod at 250 °C. Heat uniformly without direct flame. After welding, the area can be lightly polished to restore transparency.