PBT CHANG CHUN 4830‑BK
PBT CHANG CHUN 4830‑BK
PBT CHANG CHUN 4830‑BK is a 30 % glass‑fiber‑reinforced PBT resin with UL94 V‑0 flame‑retardant rating. Glass‑fiber reinforcement greatly improves mechanical strength, rigidity, heat resistance and dimensional stability.
Main Applications
Electrical & Electronics (core application): connectors, switch components, sockets, coil bobbins, rectifiers, TV parts, cooling fans.
Automotive industry: motorcycle & automotive components.
Household appliances: home‑appliance parts.
Industrial parts: power‑tool accessories.
Physical‑Mechanical‑Thermal‑Electrical Properties
| Property Category | Property Item | Test Standard | Test Data / Range | Unit |
|---|---|---|---|---|
| Physical Properties | Density | ASTM D792 | 1.56‑1.64 | g/cm³ |
| Glass‑fiber content | Ash / CCP | 30 | % | |
| Water absorption | ASTM D570 | 0.03 | % | |
| Molding shrinkage | ASTM D955 | 0.2‑1.4 | % | |
| Mechanical Properties | Tensile strength | ASTM D638 | 1100‑1400 | kg/cm² |
| Tensile strength (converted) | — | ~117.6 | MPa | |
| Elongation at break | ASTM D638 | 2.5‑4.5 (or 4‑5) | % | |
| Flexural strength | ASTM D790 | 1500‑2300 | kg/cm² | |
| Flexural strength (converted) | — | ~186.2 | MPa | |
| Flexural modulus | ASTM D790 | 70000‑100000 | kg/cm² | |
| Flexural modulus (converted) | — | ~6860 | MPa | |
| Izod notched impact | ASTM D256 | 7‑11 (or 7.0‑13.0) | kg·cm/cm | |
| Rockwell hardness | ASTM D785 | M94 / R121 | — | |
| Thermal Properties | HDT @1.8 MPa | ASTM D648 | 200‑208 | ℃ |
| HDT @0.45 MPa | ASTM D648 | 218‑220 | ℃ | |
| Melting point | DSC | 225 | ℃ | |
| CLTE | ASTM D696 | 3×10⁻⁵ | cm/cm/℃ | |
| UL94 rating | UL94 | V‑0 (1.6 mm / 3.0 mm) | class | |
| Electrical Properties | Volume resistivity | ASTM D257 | ＞10¹⁵ | Ω·cm |
| Surface resistivity | ASTM D257 | ＞10¹³‑＞10¹⁴ | Ω | |
| Dielectric strength | ASTM D149 | ＞20‑23 | kV/mm | |
| Arc resistance | ASTM D495 | 90‑100 | sec | |
| Relative permittivity (60 Hz) | ASTM D150 | 3.0‑3.5 | — | |
| Dissipation factor (60 Hz) | ASTM D150 | 0.001 | — |
Injection‑Molding Parameters
| Process Stage | Parameter Item | Reference Range / Recommendation | Unit / Remarks |
|---|---|---|---|
| Pre‑treatment | Drying temperature | 120‑150 | ℃ |
| Drying time | 6‑8 h@120 ℃ or 2‑4 h@150 ℃(bed thickness＜30 mm) | h | |
| Target moisture content | ＜0.02‑0.03 | % | |
| Drying equipment | Desiccant dryer recommended | — | |
| Injection Molding | Barrel temperature | 235‑260; keep lower for FR grade to avoid degradation | ℃ |
| Nozzle temperature | 5‑10 ℃ lower than front barrel zone | ℃ | |
| Melt temperature | 240‑260 | ℃ | |
| Mold temperature | 40‑100; commonly 70‑90 ℃; 65 ℃ for FR‑GF grade | ℃ | |
| Injection pressure | 40‑100 | MPa | |
| Injection speed | High speed; prevent surface freezing due to fast PBT crystallization | — | |
| Back pressure | Set according to melt condition, generally low | MPa | |
| Screw speed | Adjust by equipment & cycle; avoid excessive shear heat | rpm | |
| Post‑processing | Annealing temperature (if required) | 120‑150; reduce residual stress & improve dimensional stability | ℃ |
| Annealing time | 1‑2 | h | |
| Regrind material | Reuse ratio | ＜25 %; material must be clean & non‑degraded | % |
Note: All data above is for reference only.
