PA66 (Nylon 66) vs PBT GF30: 0% composition overlap. Significantly different materials serving different application areas.
PA66 (Nylon 66) vs PBT GF30
Side-by-side chemical composition and mechanical property comparison.
Overview
PA66 (Nylon 66)
Polyamide 66 — stiffer and more heat-resistant than PA6. Higher crystallinity gives better creep resistance and ~40°C higher melting point (260°C vs 220°C). Slightly more brittle. More moisture-sensitive at saturation than PA6. Trade names include Ultramid A (BASF), Zytel 101 (DuPont), Tecamid 66 (Ensinger). Dominant in US/UK markets. Used for automotive engine components, electrical connectors, gears, cable ties, and industrial bushings.
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.
| PA66 (Nylon 66) | PBT GF30 | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 10350 | ISO 10350 |
Chemical composition (wt%) — Pro
| Element | PA66 (Nylon 66) | PBT GF30 | Overlap |
|---|---|---|---|
| Hexamethylenediamine unit | 45–55% | — | — |
| Adipic Acid unit | 45–55% | — | — |
| PBT (Base Polymer) | — | 68–72% | — |
| Glass Fiber Reinforcement | — | 28–32% | — |
Mechanical properties — Pro
| Property | PA66 (Nylon 66) | PBT GF30 | Unit |
|---|---|---|---|
| Tensile Strength | 80–90 | 145–165 | MPa |
| Yield Strength | 80–85 | — | MPa |
| Elongation | 15–40 | 2–3 | % |
| Elastic Modulus | |||
| Density | |||
| Melting Point | |||
| Glass Transition Temp (Tg) | |||
| Water Absorption (24h) | |||
| Tensile Strength | |||
| Tensile Modulus | |||
| Elongation at Break | |||
| Charpy Impact (notched) | |||
| Density | |||
| Melting Point | |||
| Glass Transition Temp | |||
| Water Absorption (24h) | |||
| Water Absorption (saturation) | |||
| hdt_1_8mpa | |||
| HDT/A (1.8 MPa) | |||
| Glass Fiber Content |
Sign up free and get 3 full comparisons immediately.
Sign up free — 3 comparisons/day freeCompatibility Assessment
PA66 (Nylon 66) and PBT GF30 have significantly different compositions (0% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is PA66 (Nylon 66) the same as PBT GF30?
PA66 (Nylon 66) and PBT GF30 have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace PA66 (Nylon 66) with PBT GF30?
Generally not recommended. The compositions differ significantly (0% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between PA66 (Nylon 66) and PBT GF30?
The main differences are in the following elements: overall alloying content. PA66 (Nylon 66) is a Polymers grade, while PBT GF30 is a Polymers grade.
Related Comparisons
View full data for each material:
Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.