🧩 PET – Polyethylene Terephthalate

PET is a thermoplastic polyester material with high mechanical and chemical resistance, dimensional stability, and full recyclability. It is widely used in technical parts, housings, frames, and automotive components, as well as in packaging and technical fibers. In its crystalline form, PET is tough, rigid, and resistant to high temperatures.

🔹 What is PET PET (Polyethylene Terephthalate) is an aromatic polyester obtained by the polycondensation of terephthalic acid (PTA) with ethylene glycol (EG). It features a dense crystalline structure, offering hardness, tensile strength, and wear resistance, alongside excellent chemical resistance to oils and solvents. In the automotive industry, it is valued for its dimensional stability and smooth finish.

🔧 Composition and Properties

• Composition: 100% Polyethylene Terephthalate (aromatic polyester).
• Density: 1.37–1.40 g/cm³.
• Melting Point: ≈ 250–260 °C.
• Chemical Resistance: Excellent (oils, solvents, fuels).
• Continuous Thermal Resistance: 120–150 °C.

🚗 Automotive Applications

• Housings / Covers: Connectors, sensor covers, frames (rigid, dimensionally stable).
• Engine / Technical: Supports, guides, brackets (excellent chemical resistance).
• Headlights / Lighting: Bezels, reflector supports (glossy finish, no warping).
• Technical Interior: Aesthetic parts, small covers (good gloss, low shrinkage).

🔧 Welding Temperature and Methods

• Hot Air: 260 – 280 °C (slow, controlled melting).
• Heat Plate: 250 – 270 °C (clean joint, no bubbles).
• Manual Extrusion: 250 – 270 °C (suitable for thick parts).

🔩 Welding Compatibility

• ✅ Compatible: PBT, PBT+PET, PBT+GF, PBT+PC, PC+PBT, PET+GF.
• ❌ Incompatible: PP, PE, PS, ABS, PMMA, PVC, PA (completely different melting points).

💡 ReplastMD Recommendation: Use PET or PBT welding rod at 270 °C. Heating must be gradual – PET tends to crystallize on the surface. Avoid overheating, which can lead to a matte or porous appearance.