Typical PET
- Used in packaging and bottle adjacent molded parts
- Moisture sensitive before molding
- Can be clear in specialty grades
Material comparison
PET vs PBT: Polyester Resins for Connectors and Structural Parts
PBT is the default for many electrical connectors. PET appears where clarity, barrier, or specific electrical specs matter.
Material comparison
Polyesters with different moisture stories
Dry both correctly. Moisture shows up as splay and property drift.
PBT balances stiffness, electrical properties, and moldability for connectors.
PET can be chosen for packaging adjacent parts or when a PET grade matches an existing validation.
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 PBT
- Standard for electrical connectors and housings
- Good surface for low profile connectors
- Glass filled grades for structural brackets
Decision table
Where each resin usually wins
Qualitative tradeoffs for molded parts. Confirm shrink, fill, and tooling details on the material guide.
| Factor | PET | PBT |
|---|---|---|
| Moisture | Must be dried aggressively | Must be dried aggressively |
| Electrical | Grade specific | Common in connectors |
| Heat | Moderate | Moderate to higher with fill |
| Applications | Packaging, structural PET parts | Connectors, E/E housings |
Before you quote
Send this context with your CAD
The instant quote uses your material choice for fill, gate, and steel assumptions.
Connector standard or creep requirement
Reflow or assembly temperature
Glass fill level
Color and laser mark need
Continue exploring
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Open a sibling guide or jump to the full material library.
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Higher heat step up.
PEEK vs UltemNylon vs acetal
Alternative structural pair.
Nylon vs acetalFAQ
Common questions
Are PET bottle grades used for structural parts?
Structural molded PET uses injection molding grades, not bottle resin. Specify the molding grade 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.