PBT (unfilled)
Polybutylene Terephthalate — semi-crystalline polyester with fast crystallization (short cycle times), very low moisture absorption (0.15%), excellent dimensional stability, and good electrical properties. Key advantage over PA: properties nearly independent of humidity. Trade names include Ultradur (BASF), Celanex/Crastin (Celanese/DuPont), Valox (SABIC), Arnite T (DSM). Used for electrical connectors, relay housings, automotive sensors, and any precision part in humid environments.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| ISO | INT | PBT | — | REF | |
| 🇩🇪 | TRADE | Germany | Ultradur B4520 (BASF) | — | 95% |
| 🇺🇸 | TRADE | USA | Celanex 2000 / Crastin S600 (Celanese/DuPont) | — | 95% |
| 🇺🇸 | TRADE | USA | Valox 310 (SABIC) | — | 95% |
Sources: ISO 7792, BASF TDS, Celanese TDS, SABIC TDS
Mechanical properties — Pro
Injection Molded
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| Elastic Modulus | ||
| Density | ||
| Melting Point | ||
| Glass Transition Temp (Tg) | ||
| Water Absorption (24h) |
General
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Tensile Modulus | ||
| Elongation at Break | ||
| Charpy Impact (notched) | ||
| Density | ||
| Melting Point | ||
| HDT/A (1.8 MPa) | ||
| Water Absorption (24h) |
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