PBT GF30
Polybutylene Terephthalate with 30% glass fiber — THE connector and electrical component material. Key advantage over PA6 GF30: near-zero moisture absorption (0.02-0.2%), so mechanical and electrical properties are stable regardless of humidity. Lower UTS than PA6 GF30 but consistent. Trade names include Ultradur B4300 G6 (BASF), Valox 420 (SABIC), Celanex (Celanese), Crastin (DuPont). Used for electrical connectors, relay housings, coil formers, automotive sensors, and any part requiring dimensional stability in humid environments.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| ISO | INT | PBT-GF30 | — | REF | |
| 🇩🇪 | TRADE | Germany | Ultradur B4300 G6 (BASF) | — | 95% |
| 🇺🇸 | TRADE | USA | Valox 420 (SABIC) | — | 95% |
| 🇺🇸 | TRADE | USA | Crastin SK605 (DuPont) | — | 95% |
| 🇺🇸 | TRADE | USA | Celanex 3300 (Celanese) | — | 95% |
| 🇩🇪 | TRADE | Germany | TECADUR PBT GF30 (Ensinger) | — | 95% |
Sources: ISO 7792, BASF TDS, SABIC TDS, DuPont TDS, Celanese TDS, Ensinger TDS
Chemical composition comparison (wt%)
Side-by-side: PBT GF30 (COMPOSITION) (ISO 7792) vs Ultradur B4300 G6 (BASF) (TRADE)
| Element | PBT GF30 (COMPOSITION) | Ultradur B4300 G6 (BASF) (TRADE) | Overlap |
|---|---|---|---|
| PBT (Base Polymer) | 68–72% | — | — |
| Glass Fiber Reinforcement | 28–32% | — | — |
Mechanical properties
Dry As Molded
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 145–165 | MPa |
| Elongation | 2–3 | % |
| Elastic Modulus | 9.5–11 | GPa |
| Density | 1.52–1.54 | g/cm3 |
| hdt_1_8mpa | 200–210 | °C |
| Melting Point | 220–225 | °C |
| Water Absorption (24h) | 0.02–0.08 | % |
General
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 130–150 | MPa |
| Tensile Modulus | 10000–12000 | MPa |
| Elongation at Break | 2–4 | % |
| Charpy Impact (notched) | 8–12 | kJ/m² |
| Density | 1.52–1.55 | g/cm³ |
| Melting Point | 223–227 | °C |
| HDT/A (1.8 MPa) | 210–220 | °C |
| Water Absorption (24h) | 0.03–0.06 | % |
| Glass Fiber Content | 30 | % |
Compatibility verdict
PBT GF30 and Ultradur B4300 G6 (BASF): 95% composition match
Close equivalents but NOT identical.
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