PBT SABIC VALOX 325
PBT SABIC VALOX 325
PBT SABIC VALOX 325 is a well‑balanced, unreinforced injection‑molding general‑purpose engineering plastic. It features good toughness, excellent electrical performance and chemical resistance.
Main Applications
Industrial parts: sprayers, nozzles, pumps.
Automotive components: door handles, housing covers.
Consumer goods: stationery such as pens and pencils.
Electrical & Electronics: general electrical‑electronic parts due to favorable electrical‑insulation property.
Physical‑Mechanical‑Thermal‑Electrical Properties
| Property Category | Property Item | Test Standard / Condition | Test Data / Range | Unit |
|---|---|---|---|---|
| Physical Properties | Density | ASTM D792 | 1.31 | g/cm³ |
| Reinforcement content | — | 0 | % | |
| Water absorption (24 h,23 ℃) | ASTM D570 | 0.08 | % | |
| Equilibrium water absorption (23 ℃) | ASTM D570 | 0.34 | % | |
| Molding shrinkage (flow,2.3‑4.6 mm) | ASTM D955 | 0.9‑1.6 | % | |
| Molding shrinkage (flow,＞4.6 mm) | ASTM D955 | 1.5‑2.3 | % | |
| Molding shrinkage (transverse,2.3‑4.6 mm) | ASTM D955 | 1.0‑1.7 | % | |
| Molding shrinkage (transverse,＞4.6 mm) | ASTM D955 | 1.6‑2.4 | % | |
| Mechanical Properties | Tensile strength (yield) | ASTM D638 | 52 | MPa |
| Elongation at break | ASTM D638 | 200 | % | |
| Flexural strength (yield) | ASTM D790 | 83 | MPa | |
| Flexural modulus | ASTM D790 | 2343 | MPa | |
| Rockwell hardness (R‑scale) | ASTM D785 | 117 | — | |
| Izod notched impact (23 ℃) | ASTM D256 | 53 | J/m | |
| Thermal Properties | HDT @1.8 MPa | ASTM D648 | 54 | ℃ |
| HDT @0.45 MPa | ASTM D648 | 154 | ℃ | |
| UL RTI (electrical / impact) | UL 746B | 120 | ℃ | |
| UL RTI (no impact) | UL 746B | 140 | ℃ | |
| UL94 rating (0.8 mm) | UL94 | HB | class | |
| Electrical Properties | Volume resistivity | ASTM D257 | ＞4.0×10¹⁶ | Ω·cm |
| Dielectric strength (3.2 mm,in air) | ASTM D149 | 400 | V/mil | |
| Relative permittivity (100 Hz) | ASTM D150 | 3.30 | — | |
| Relative permittivity (1 MHz) | ASTM D150 | 3.10 | — | |
| Dissipation factor (100 Hz) | ASTM D150 | 0.0020 | — | |
| Dissipation factor (1 MHz) | ASTM D150 | 0.0200 | — |
Injection‑Molding Parameters
| Process Stage | Parameter Item | Reference Range / Recommendation | Unit / Remarks |
|---|---|---|---|
| Pre‑treatment | Drying temperature | 120‑140 | ℃ |
| Drying time | 6‑8 h@120 ℃; 2‑4 h@140 ℃ (bed thickness＜30 mm) | h | |
| Target moisture content | ＜0.02 | % | |
| 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; do NOT exceed 280 ℃(decomposition) | ℃ | |
| Mold temperature | 70‑80 ℃, ΔT ≤10 ℃ | ℃ | |
| Injection pressure | 50‑100 | MPa | |
| Injection speed | Relatively fast(PBT fast‑cooling characteristic) | — | |
| Back pressure | 10‑15 % of injection pressure | MPa | |
| Screw speed | 25‑60; max ≤80 | rpm | |
| Mold | Runner type | Round runner recommended | — |
| Gate type | All gate types are applicable | — | |
| Mold cooling | Uniform mold temperature, temperature difference ≤10 ℃ | — | |
| Post‑processing | Cycle time | 15‑60 | s |
| 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.
