PBT Dow‑DuPont ST820
PBT Dow‑DuPont ST820
PBT Dow‑DuPont ST820 is an unreinforced, high‑impact PBT engineering plastic. It delivers superior impact resistance, excellent lubricity and high flowability.
Main Applications
Automotive industry: automotive component manufacturing.
Sheets & profiles: suitable for sheet and profile production.
Wire & cable: applicable for wire‑and‑cable products.
Electrical & Electronics: general electrical‑electronic parts benefiting from good electrical insulation.
Industrial parts: piping and other industrial applications.
Physical‑Mechanical‑Thermal‑Electrical Properties
| Property Category | Property Item | Test Standard / Condition | Test Data / Range | Unit |
|---|---|---|---|---|
| Physical Properties | Density | ISO 1183 | 1.21‑1.28 | g/cm³ |
| Water absorption (24 h,23 ℃) | ISO 62 | 0.12‑0.31 | % | |
| Equilibrium water absorption (23 ℃) | ISO 62 | 0.12 | % | |
| Molding shrinkage (flow direction) | ISO 294‑4 | 1.7‑1.8 | % | |
| Molding shrinkage (transverse direction) | ISO 294‑4 | 1.7 | % | |
| Mechanical Properties | Tensile strength (yield) | ISO 527‑2 | 35‑37 | MPa |
| Elongation at break | ISO 527‑2 | ＞50‑150 | % | |
| Tensile modulus | ISO 527‑2 | 1600 | MPa | |
| Flexural strength | ISO 178 | 50‑53 | MPa | |
| Flexural modulus | ISO 178 | 1500‑1680 | MPa | |
| Charpy notched impact (23 °C) | ISO 179/1eA | 85‑87 | kJ/m² | |
| Charpy notched impact (-30 °C) | ISO 179/1eA | 12.8 | kJ/m² | |
| Charpy un‑notched impact (23 °C) | ISO 179/1eU | N (no break) | kJ/m² | |
| Izod notched impact (23 °C) | ISO 180/1A | 60 | kJ/m² | |
| Thermal Properties | HDT @1.8 MPa | ISO 75‑2/A | 48‑50 | ℃ |
| HDT @0.45 MPa | ISO 75‑2/B | 100‑145 | ℃ | |
| Melting point | ISO 11357‑3 | 225 | ℃ | |
| Vicat softening temperature | ISO 306 | 123 | ℃ | |
| Coefficient of linear thermal expansion | ISO 11359‑1/‑2 | 1.9×10⁻⁴ | cm/cm/℃ | |
| UL94 (0.8 mm) | UL94 | HB | class | |
| Electrical Properties | Volume resistivity | IEC 60093 | ＞1×10¹³ | Ω·m |
| Surface resistivity | IEC 60093 | 1×10¹⁵ | Ω | |
| CTI | IEC 60112 | 600 | V |
Injection & Extrusion Parameters
| Process Stage | Parameter Item | Reference Range / Recommendation | Unit / Remarks |
|---|---|---|---|
| Pre‑treatment | Drying temperature | 110‑130 | ℃ |
| Drying time (desiccant dryer) | 2‑4 | h | |
| Target moisture content | ＜0.04 | % | |
| Drying equipment | Desiccant dryer recommended | — | |
| Injection Molding | Rear barrel temperature | 210‑240 | ℃ |
| Middle barrel temperature | 235‑250 | ℃ | |
| Front barrel temperature | 235‑250 | ℃ | |
| Nozzle temperature | Slightly lower than or equal to front zone | ℃ | |
| Melt temperature | 240‑260; optimum:250 | ℃ | |
| Mold temperature | 30‑130; optimum:80 | ℃ | |
| Injection / holding pressure | ≥60 (holding) | MPa | |
| Injection speed | Medium‑to‑high | — | |
| Holding time | 3 | s/mm | |
| Back pressure | As low as possible | — | |
| Screw speed | 28 | rpm | |
| Ejection temperature | 170 | ℃ | |
| Extrusion | Melt temperature | 240‑260 | ℃ |
| Mold | Runner type | Round runner recommended | — |
| Gate type | All gate types are applicable | — | |
| Mold cooling | Uniform cavity temperature | — | |
| Post‑processing | Annealing (if required) | Reduce residual stress, improve dimensional stability | ℃ |
| Annealing time | Adjust according to wall thickness | h |
Note: All data above is for reference only.
