Key takeaway: Choosing PA6, PA66, PA12, or PA1010 requires balancing moisture behavior, strength, heat, chemicals, toughness, dimensional stability, cost, and service conditions.
Choose from the service environment
PA6, PA66, PA12, and PA1010 are families with many grades, not four interchangeable specifications. Compare moisture exposure, temperature, load, impact, wear, chemicals, dimensional stability, electrical or regulatory needs, color, reinforcement, and cost over the actual service life.
BASF identifies PA6 and PA66 families within Ultramid, while Arkema describes PA12 as a material with lower moisture absorption than shorter-chain polyamides. Evonik’s VESTAMID Terra DS identifies PA1010 as a bio-based polyamide 1010. These references help frame the selection, but the exact grade datasheet and application approval remain decisive.
- Define dry, conditioned, hot, cold, chemical, and load conditions.
- Compare reinforced and unreinforced grades separately.
- Request the exact grade’s data sheet, processing guidance, and compliance documents.
Understand the practical tradeoffs
PA6 and PA66 can provide strong engineering performance, but moisture conditioning can change dimensions and mechanical behavior. PA12 is often considered when toughness, chemical resistance, and lower moisture sensitivity are important. PA1010 can be attractive where its specific property, sourcing, or bio-based content fits the design, but it still needs grade-specific validation.
Do not choose from a generic property table alone. Mold temperature, drying, gate, shrinkage, fiber orientation, wall thickness, and post-conditioning can change the part result.
- Make moisture conditioning part of dimensional validation.
- Review shrinkage and fiber orientation if reinforced.
- Test the actual grade in the actual geometry.
Lock the material decision with evidence
Create a material selection record linking requirements to grade, supplier, lot, drying or handling limits, mold and process settings, tests, and approvals. If the grade changes, recheck flow, shrinkage, dimensions, appearance, strength, and chemical or thermal performance before release.
- Use a controlled approved-material list.
- Keep certificates and lot traceability with production records.
- Define change-control and requalification triggers.
Frequently Asked Questions
Are PA6, PA66, PA12, and PA1010 interchangeable?
No. They differ in moisture behavior, thermal and mechanical performance, chemical resistance, toughness, shrinkage, processing, and grade availability.
Why is the exact grade important?
Reinforcement, additives, color, flame retardance, viscosity, and supplier formulation can change processing and part performance substantially.
What should be validated after a polyamide change?
Flow, drying, shrinkage, dimensions, conditioning, appearance, strength, chemical or thermal performance, and the applicable release documents.
Need a part-specific review? Share the 3D model, resin or grade, annual volume, finish requirement, tolerance concerns, and target launch date through our contact page. We can then align DFM, mold design, process, inspection, and delivery assumptions.
Sources and further reading
Related Cavity Mold Services
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Select polyamide by service condition
PA6, PA66, PA12, and PA1010 belong to the same broad family but can behave differently in moisture uptake, stiffness, toughness, temperature exposure, chemical contact, shrinkage, and processing. Start with the part’s environment.
| Decision | Evidence to review | Boundary |
|---|---|---|
| Environment | Map moisture, temperature, chemicals, electrical exposure, and service time. | Dry-as-molded data may not represent conditioned part behavior. |
| Mechanical function | Define stiffness, impact, fatigue, wear, creep, and fastening loads. | Property data must match the test direction and conditioning. |
| Geometry and tolerance | Review wall, ribs, bosses, flow direction, warpage, and assembly fit. | Fiber, moisture, and orientation can alter dimensions. |
| Processing route | Check drying, melt and mold conditions, residence, gate, cooling, and regrind policy. | Use the selected grade supplier’s current data and limits. |
Polyamide selection checkpoints
- Write the service and test conditions.
- Shortlist grades using supplier data, not polymer name alone.
- Mold representative geometry and condition samples.
- Approve the grade with dimensional and functional evidence.
Bring the environment and CTQs to engineering before requesting a grade-specific RFQ.