PA66 Nylon 66 Unfilled: Standard Engineering Thermoplastic for Mechanical Components
Published: 2026-06-08
PA66 unfilled offers higher strength, stiffness, and heat resistance than PA6, making it the preferred nylon for automotive under-hood and industrial mechanical components.
Technical Properties
| Density | 1.14 g/cm³ |
|---|---|
| Tensile Strength | 80 MPa (dry) |
| Melting Point | 260 °C |
| Shrinkage Rate | 1.5-2.0% |
| Flexural Modulus | 3.0 GPa |
| Hdt | 95 °C at 1.82 MPa |
| Continuous Service Temp | 120 °C |
Engineering Tool: Shrinkage & Cost Estimator
Calculate part weight, mold cavity dimensions accounting for shrinkage, and material cost — all locally in your browser.
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| BASF Ultramid A3K | |
| DuPont Zytel 101L | |
| Radici Radilon A |
Frequently Asked Questions
PA66 vs PA6 — when to use which?
PA66: higher strength, stiffness, melting point (260°C vs 220°C), and better creep resistance. PA6: better impact at low temperature, better surface finish, 15-20% lower cost. For automotive engine bay components, PA66 is standard. For consumer goods and general engineering, PA6 is usually sufficient.
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References & Industry Standards
- ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
- UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
- MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
- ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org