Definition & Chemical Basis
PA12 (Polyamide 12 or Nylon 12) is a semi-crystalline thermoplastic belonging to the nylon family, synthesized from laurolactam monomers. It exhibits a lower density (1.01–1.02 g/cm³) compared to other polyamides like PA6 or PA66.
Key Properties
- Low Moisture Absorption
- Absorption rate of ~0.25% (vs. 1.5–3.0% for PA6/PA66), ensuring dimensional stability in humid environments.
- Flexibility & Toughness
- High impact resistance and elongation at break, retaining ductility at temperatures as low as −40°C.
- Chemical Resistance
- Resistant to oils, fuels, hydraulic fluids, and alkalis; suitable for automotive and industrial fluids contact.
- Processing Fluidity
- Low melt viscosity enables easy injection molding, extrusion, and blow molding.
- Thermal Performance
- Melting point: 178°C; continuous service temperature: 80–90°C.
Comparison vs. Common Nylons
|
Property |
PA12 |
PA66 |
PA6 |
|
|
Moisture Absorption |
0.25% |
2.5–3.0% |
3.0%+ |
17 |
|
Density (g/cm³) |
1.01–1.02 |
1.14 |
1.13 |
46 |
|
Flexibility |
High |
Moderate |
Moderate |
18 |
Primary Applications
Automotive
Fuel lines, brake hoses, pneumatic tubing (resistance to hydrocarbons and abrasion).
Industrial
Cable sheathing, bearings, sliding mechanisms (low friction coefficient).
Consumer Goods
Sports equipment, toothbrush bristles (flexibility and safety).
Electronics
Insulating components for sensors/connectors (dielectric properties).
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