TPEE Celanese 4069
TPEE Celanese 4069 (Formerly Dow‑DuPont)
TPEE Celanese 4069 (formerly Dow‑DuPont) is a low‑hardness, low‑modulus thermoplastic polyester elastomer. It delivers high elasticity, excellent flex‑fatigue resistance, impact resistance (especially at low temperature), tear resistance and wear resistance.
Application Fields
Medical Devices: Respiratory mask sealing rings, surgical‑instrument handles, infusion tube connectors.
Food Packaging: Beverage transfer hoses, dairy pump valves.
Aerospace: Fuel‑system seals, damping pads for avionics equipment.
Industrial Precision Parts: Analytical‑instrument pipelines, protective sleeves for robot joints.
Physical Properties
表格
| Parameter | Test Method | Typical Value | Unit | Comparative Advantages |
|---|---|---|---|---|
| Density | D792 | 1.22 | g/cm³ | 5% higher than general‑purpose TPEE |
| Melt Flow Index (220℃/5kg) | D1238 | 5‑9 | g/10min | High shear stability |
| Tensile Strength | D638 | 45 | MPa | 30% higher than medical‑grade TPU |
| Elongation at Break | D638 | 450 | % | Ductility maintained under high rigidity |
| Flexural Modulus | D790 | 350 | MPa | Ideal stiffness for structural supporting parts |
| Shore D Hardness | D2240 | 50 | — | Balanced flexibility and load‑bearing capacity |
| Vicat Softening Point | D1525 | 165 | ℃ | Key indicator for steam sterilization resistance |
| Volume Resistivity | D257 | 1×10¹⁵ | Ω·cm | Preferred choice for electrical‑insulation protection |
Processing Technology
表格
| Process Step | Parameter Range | Failure Risk Control |
|---|---|---|
| Drying Condition | 90℃ × 4‑6 h (dew point ‑40℃) | Moisture content ≤0.02% (prevent hydrolysis & brittleness) |
| Melt Temperature | Injection: 200‑235℃; Extrusion: 190‑220℃ | Molecular‑chain cleavage occurs above 240℃ |
| Mold Temperature | 50‑80℃ | Cold flow marks below 40℃; longer cycle time above 90℃ |
| Injection Pressure | 70‑120 MPa (upper limit for high‑speed thin‑wall parts) | Pressure fluctuation causes batch color difference |
| Screw Speed | 30‑70 rpm | High speed triggers shear overheating (temperature rise ≤10℃) |
| Regrind Ratio | ≤20% (regrind prohibited for medical‑grade parts) | Impact strength drops by 40% after multiple recycling |
Note: All information above is for reference only!
