PBT Sanfangxiang G20
PBT Sanfangxiang G20
PBT Sanfangxiang G20 is a 20 % glass‑fiber‑reinforced, UL94 V‑0 flame‑retardant engineering plastic. Widely used for its good mechanical strength, dimensional stability, heat resistance, electrical insulation and flame retardancy.
Main Applications
Electrical & Electronics (core application): computer connectors, coil bobbins, capacitor housings, relays, switches, thermostat components, transformer bobbins, electronic connectors.
Automotive industry: automotive component manufacturing. This grade is widely used in electronics & electrical, automotive, communication, home‑appliance and transportation fields.
Household appliances: home‑appliance parts, lighting components such as energy‑saving lamp bases.
Industrial parts: instrument‑meter components and mechanical parts.
Physical‑Mechanical‑Thermal‑Electrical Properties
| Property Category | Property Item | Test Standard / Condition | Test Data / Range | Unit |
|---|---|---|---|---|
| Physical Properties | Density | ASTM D‑792 | 1.56 | g/cm³ |
| Glass‑fiber content | — | 20 | % | |
| Water absorption (23 ℃,50 %RH) | ASTM D‑570 | 0.10 | % | |
| Molding shrinkage | ASTM D‑955 | 0.6‑1.5 | % | |
| Mechanical Properties | Tensile strength | ASTM D‑638 | 100 | MPa |
| Elongation at break | ASTM D‑638 | 3 | % | |
| Flexural strength | ASTM D‑790 | 160 | MPa | |
| Flexural modulus | ASTM D‑790 | 6000 | MPa | |
| Izod notched impact strength | ASTM D‑256 | 60 | J/m | |
| Izod un‑notched impact strength | ASTM D‑256 | 350 | J/m | |
| Thermal Properties | HDT @1.82 MPa | ASTM D‑648 | 200 | ℃ |
| HDT @0.46 MPa | ASTM D‑648 | 215 | ℃ | |
| UL94 (1/16") | UL94 | V‑0 | class | |
| Electrical Properties | Volume resistivity | ASTM D‑257 | 10¹⁶ | Ω·cm |
| Dielectric strength | ASTM D‑149 | 21 | kV/mm | |
| Relative permittivity (10⁶ Hz) | ASTM D‑150 | 3.4 | — | |
| Dissipation factor (10⁶ Hz) | ASTM D‑150 | 0.02 | — |
Injection‑Molding Parameters
| Process Stage | Parameter Item | Reference Range / Recommendation | Unit / Remarks |
|---|---|---|---|
| Pre‑treatment | Drying temperature | 120‑140 | ℃ |
| Drying time | 3‑5 h (material bed thickness＜30 mm) | h | |
| Target moisture content | ＜0.03 | % | |
| Drying equipment | Desiccant dryer recommended | — | |
| Injection Molding | Rear barrel temperature | 220‑240 | ℃ |
| Middle barrel temperature | 230‑250 | ℃ | |
| Front barrel temperature | 240‑260 | ℃ | |
| Nozzle temperature | Slightly lower than or equal to front zone | ℃ | |
| Melt temperature | 240‑260 | ℃ | |
| Mold temperature | 60‑80 | ℃ | |
| Injection pressure | 60‑100 | MPa | |
| Injection speed | As fast as possible (PBT solidifies rapidly) | — | |
| Back pressure | 5‑10 | MPa | |
| Screw speed | 50‑80 | rpm | |
| Mold | Runner type | Round runner recommended | — |
| Gate type | All gate types are applicable | — | |
| Mold cooling | Well‑designed cooling channels for uniform & fast heat dissipation | — | |
| 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.
