Typical nylon 6
- Easier flow in thin wall parts
- Lower melting window than 66
- Moisture still requires drying and dimensional planning
Material comparison
Nylon 6 vs Nylon 66: Heat, Moisture, and Moldability
Nylon 66 runs hotter and stiffer when dry. Nylon 6 can be easier to fill in thin walls with slightly higher moisture sensitivity.
Material comparison
Same family, different heat and moisture curves
Both need drying. Spec the grade that matches continuous use temperature.
Nylon 66 is common when heat and stiffness matter under the hood or in electrical devices.
Nylon 6 appears where molders want easier flow in thin sections without switching to a different polymer family.
Resin choice
Typical versus Typical at a glance
Use this routing before you lock the BOM. NetProto molds both once the resin is specified on the quote.
Typical nylon 66
- Higher heat deflection when conditioned dry
- Preferred for structural brackets and connectors
- Can be more sensitive to gate and vent design on large parts
Decision table
Where each resin usually wins
Qualitative tradeoffs for molded parts. Confirm shrink, fill, and tooling details on the material guide.
| Factor | nylon 6 | nylon 66 |
|---|---|---|
| Heat | Moderate HDT | Higher HDT |
| Moisture | Absorbs, plan dimensions | Absorbs, plan dimensions |
| Flow | Often easier in thin walls | Can need higher fill pressure |
| Cost | Often lower resin cost | Often higher resin cost |
Before you quote
Send this context with your CAD
The instant quote uses your material choice for fill, gate, and steel assumptions.
Continuous use temperature
Glass fill percentage if any
Humidity during assembly and storage
Connector or snap tolerance stack
Continue exploring
Related comparisons
Open a sibling guide or jump to the full material library.
Compare hub
All comparison guides.
Compare hubMaterials library
Deep guides per resin family.
Materials libraryNylon vs acetal
Leave nylon family versus POM.
Nylon vs acetalGlass filled vs unfilled
Stiffness from fill.
Glass filled vs unfilledFAQ
Common questions
Are they interchangeable on the quote?
No. Tooling shrink and fill differ. Pick one before steel is cut and keep it on the PO.
Next step
Quote both options with the same CAD
Upload once, switch resin in the quote flow, and compare piece price on the same tool. NetProto manufacturing is ISO 9001 certified.