PBT BASF B4500
PBT BASF B4500
PBT BASF B4500 is semi‑crystalline thermoplastic saturated polyester, noted for high stiffness, strength, very low water absorption and good high‑temperature dimensional stability.
Main Applications
Electrical & electronics: connectors, small switches, capacitor housings, relays, coil bobbins, insulating sleeves; excellent electrical insulation and dimensional stability.
Automotive industry: automotive‑electronic parts, exterior door handles, fuel‑system components, wind‑wiper arms, head‑lamp structures; good heat‑resistance, friction‑resistance and chemical‑resistance.
Industrial manufacturing:
- Piping systems: fluid‑transfer pipes for industrial & building fields, good corrosion resistance & dimensional stability.
- Profiles & films: extruded thin‑wall profiles, pipes, cast films for packaging and other industrial uses.
- Food‑contact & medical packaging: food‑contact variant B4500 FC for sterile‑packaging films for medical devices, hot‑fill containers.
Physical‑Mechanical‑Thermal‑Electrical Properties
| Property Category | Property Item | Test Standard | Test Data | Unit |
|---|---|---|---|---|
| Physical Properties | Density | ISO 1183 | 1.30 | g/cm³ |
| MVR (250℃/2.16 kg) | ISO 1133 | 19.0‑21.0 | cm³/10min | |
| Water absorption (23℃/24h) | ISO 62 | 0.5 | % | |
| Water absorption (23℃,50 %RH) | ISO 62 | 0.25 | % | |
| Molding shrinkage (flow direction) | ISO 294‑4 | 1.6 | % | |
| Molding shrinkage (transverse direction) | ISO 294‑4 | 1.9 | % | |
| Mechanical Properties | Tensile strength (yield,23℃) | ISO 527‑2 | 55 | MPa |
| Elongation at break (23℃) | ISO 527‑2 | ＞50 | % | |
| Tensile modulus (23℃) | ISO 527‑2 | 2500 | MPa | |
| Flexural strength (23℃) | ISO 178 | 85 | MPa | |
| Charpy notched impact (23℃) | ISO 179/1eA | 6.0 | kJ/m² | |
| Charpy un‑notched impact (23℃) | ISO 179 | 290 | kJ/m² | |
| Ball indentation hardness | ISO 2039‑1 | 130 | MPa | |
| Shore‑D hardness | ISO 868 | 130 | — | |
| Thermal Properties | HDT (1.8 MPa) | ISO 75‑2/A | 65.0 | ℃ |
| HDT (0.45 MPa) | ISO 75‑2/B | 165 | ℃ | |
| Melting point | ISO 11357‑3 | 223 | ℃ | |
| Vicat softening temperature | — | 165 | ℃ | |
| CLTE | ISO 11359‑2 | 1.3E‑4‑1.6E‑4 | cm/cm/℃ | |
| Thermal conductivity | DIN 52612 | 0.27 | W/m/K | |
| Electrical Properties | Volume resistivity | IEC 60093 | 1.0E+16 | Ω·cm |
| Surface resistivity | IEC 60093 | 1.0E+13 | Ω | |
| Dielectric strength(2 mm) | — | ≥20 | kV/mm | |
| Relative permittivity(100 Hz) | IEC 60250 | 3.2 | — | |
| Dissipation factor(100 Hz) | IEC 60250 | 200×10⁻⁴ | — | |
| CTI | IEC 60112 | 550 | V | |
| Flammability | UL94 | UL94 | HB (0.75 mm) | class |
Processing Parameters
| Process Stage | Property Item | Reference Range / Recommendation | Unit / Remarks |
|---|---|---|---|
| Pre‑treatment | Drying temperature | 120‑150 | ℃ |
| Drying time | 2‑8 h (depends on temp & equipment) | h | |
| Allowable moisture | ＜0.03‑0.05 | % | |
| Injection molding | Rear barrel temp | 220‑240 | ℃ |
| Middle barrel temp | 230‑250 | ℃ | |
| Front barrel temp | 240‑260 | ℃ | |
| Nozzle temp | 240‑260 | ℃ | |
| Melt temperature | 250(recommended) /225‑275(range) | ℃ | |
| Mold temperature | 40‑70;40‑60 ℃ for unreinforced | ℃ | |
| Injection pressure | Medium; max 1500 bar | bar | |
| Hold pressure | Adjust per part geometry & dimension | MPa | |
| Injection speed | As fast as possible(PBT fast‑solidifying) | — | |
| Back pressure | 0.3‑0.6 | MPa | |
| Screw speed | Adjust for equipment & cycle; avoid excessive shear heat | rpm | |
| Extrusion | Processing method | Pipe extrusion, profile extrusion, cast‑film extrusion | — |
| Post‑processing | Annealing temp | 120‑140 (release internal stress, improve dimensional stability) | ℃ |
| Annealing time | 1‑2 h (depends on wall thickness) | h |
Note: All data above is for reference only.
