PBT Polyplastics 3316
PBT Polyplastics 3316
PBT Polyplastics 3316 is a 30 % glass‑fiber‑reinforced PBT resin with UL94 V‑0 flame‑retardant rating. It delivers excellent strength, rigidity, heat resistance, electrical performance and flame‑retardant property.
Main Applications
Electrical & Electronics (core application): connectors, coil bobbins, small switches, capacitor housings, relays, no‑fuse breakers, electromagnetic switches, flyback transformers.
Automotive industry: door handles, bumpers, distributor covers, fenders, wire harness sheaths, wheel‑cover panels, automotive electronic components.
Industrial parts: OA fans, keyboards, fishing‑reel components, lamp housings, instrument‑meter parts requiring wear resistance, dimensional accuracy and flame retardancy.
Household appliances: food‑processing blades, vacuum‑cleaner components, electric fans, hair‑dryer housings, coffee‑maker parts.
Other fields: office‑equipment & mechanical components.
Physical‑Mechanical‑Thermal‑Electrical Properties
| Property Category | Property Item | Test Standard / Condition | Test Data / Range | Unit |
|---|---|---|---|---|
| Physical Properties | Density | ISO 1183 | 1.54 | g/cm³ |
| Density | ASTM D‑792 | 1.66 | g/cm³ | |
| Water absorption (23 ℃/24h) | ISO 62 | 0.10 | % | |
| Water absorption (23 ℃/24h) | — | 0.50 | % | |
| Molding shrinkage (flow direction) | — | 1.6‑2.0 (estimated) | % | |
| Molding shrinkage (transverse direction) | — | 1.9‑2.3 (estimated) | % | |
| Mechanical Properties | Tensile strength | ISO 527‑1,2 | 113 | MPa |
| Tensile strength | ASTM D‑638 | 147 | MPa | |
| Elongation at break | ISO 527‑1,2 | 2.7 | % | |
| Elongation at break | ASTM D‑638 | 2.7 | % | |
| Flexural strength | ISO 178 | 173 | MPa | |
| Flexural strength | ASTM D‑790 | 225 | MPa | |
| Flexural modulus | ISO 178 | 6050 | MPa | |
| Flexural modulus | ASTM D‑790 | 9610 | MPa | |
| Charpy notched impact | ISO 179/1eA | 7.1 | kJ/m² | |
| Izod notched impact | ASTM D‑256 | 98 | J/m | |
| Izod un‑notched impact | ASTM D‑256 | 680 | J/m | |
| Thermal Properties | HDT @1.82 MPa | ISO 75‑1,2 | 208 | ℃ |
| HDT @1.82 MPa | ASTM D‑648 | 212 | ℃ | |
| Melting point | — | ~220‑225 (typical) | ℃ | |
| CLTE (flow direction) | ISO 11359‑2 | 4.0×10⁻⁵ | /℃ | |
| CLTE (transverse direction) | ISO 11359‑2 | 8.0×10⁻⁵ | /℃ | |
| UL94 rating | UL94 | V‑0 | class | |
| Electrical Properties | Volume resistivity | IEC 60093 | 2×10¹⁶ | Ω·cm |
| Volume resistivity | ASTM D‑257 | 1×10¹⁶ | Ω·cm | |
| Dielectric strength(short‑time,3 mm) | IEC 60243‑1 | 20 | kV/mm | |
| Dielectric strength(short‑time,3 mm) | ASTM D‑149 | 20 | kV/mm | |
| CTI | IEC 60112 | 250 (PLC 2) | V | |
| Arc resistance | — | 92 | s | |
| Surface resistivity | — | 1×10¹⁶ | Ω |
Injection‑Molding Parameters
| Process Stage | Parameter Item | Reference Range / Recommendation | Unit / Remarks |
|---|---|---|---|
| Pre‑treatment | Drying temperature | 110‑120 ℃ / 120 ℃(6‑8h) /150 ℃(2‑4h) | ℃ |
| Drying time | 2‑3 h @110‑120℃ / 6‑8h@120℃ / 2‑4h@150℃ | h | |
| Target moisture content | ＜0.03 % / ＜0.05 % | % | |
| Drying equipment | Desiccant dryer recommended | — | |
| Injection molding | Melt temperature | 250‑270 ℃ / 225‑275 ℃(recommended 250 ℃) | ℃ |
| Mold temperature | 50‑75 ℃ / 40‑60 ℃(unreinforced ref) / 80‑100 ℃(better surface) | ℃ | |
| Injection pressure | 100‑140 MPa / medium(max 1500 bar) | MPa / bar | |
| Hold pressure | 50%‑80% of injection pressure | — | |
| Injection speed | As fast as possible; PBT solidifies rapidly | — | |
| Back pressure | 5‑10 MPa / adjust by melt condition(low normally) | MPa | |
| Screw speed | 70‑90 rpm / adjust by equipment, avoid excessive shear heat | rpm | |
| Mold | Runner type | Round runner recommended(D = part thickness + 1.5 mm) | — |
| Gate type | Multiple options; hot‑runner available(prevent leakage & degradation) | — | |
| Gate dimension | 0.8‑1.0 × t(t = part thickness); sub‑gate ≥0.75 mm | mm | |
| Venting | Sufficient venting required | — | |
| 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.
