Material focus
TPO selection, applications, and sibling resin routing on this page.
TPO
TPO Injection Molding: Properties, Applications and Design Guide
Thermoplastic polyolefin (TPO) is a blend of polypropylene with an elastomer phase, and often talc or mineral filler, that keeps PP processing while adding low-temperature impact strength.
TPO
When to specify TPO
How procurement and design teams use TPO on injection molded programs.
Thermoplastic polyolefin (TPO) is a blend of polypropylene with an elastomer phase, and often talc or mineral filler, that keeps PP processing while adding low-temperature impact strength. It is a common choice for automotive exterior and interior parts such as bumper fascias, cladding, rocker panels, and trim, where weathering, cold impact, and low weight matter together. TPO is not a soft elastomer like TPE; it sits between rigid PP and flexible materials, and painted TPO parts usually need an adhesion promoter or surface treatment. At NetProto, programs run from first-article validation through production on one hardened steel tool with no minimum order quantity. Upload CAD on the instant quote platform for DFM feedback before tooling release.
Key traits
Why buyers specify TPO
Engineering and sourcing highlights. No NetProto processing numbers on this page.
Sourcing
Grade and compliance context travels with CAD on the instant quote platform.
Program fit
First articles through production on one steel tool, no MOQ.
NetProto platform
Instant CAD quoting and DFM feedback before tooling release.
Tooling lead time
Hardened steel tool build in about 10 business days on qualified programs (part complexity dependent).
Applications
Where this resin shows up on BOMs
Typical molded parts and what to specify on the purchase order.
| Application | Why this resin | Specify on the PO |
|---|---|---|
| Bumper fascias and exterior cladding | Cold impact and weathering with low weight | UV-stabilized grade, paint or mold-in-color |
| Interior trim and door panels | Stiffness with impact at low cost | Talc loading, grain texture, scratch target |
| Outdoor equipment covers | PP chemical resistance with tougher impact | Service temperature range and UV exposure |
Routing
TPO, TPE, TPU, or PVC
One-line routing. Details live on each material page.
| Need | Start with | Why |
|---|---|---|
| Semi-rigid exterior panels with cold impact | TPO | PP base with elastomer toughening |
| Soft-touch grips and overmolds | TPE | Soft elastomer that bonds to rigid resins |
| Abrasion-resistant flexible parts | TPU | Tougher wear surface |
| Low-cost flexible parts | Flexible PVC | Plasticized vinyl |
RFQ
Ready to quote? Have this information ready
Prepare these details, then upload CAD on the instant quote platform.
Weathering and UV exposure in service
Low-temperature impact requirement (coldest service temperature)
Painting, welding, or mold-in-color plan for the part
Hardness or stiffness range, or a reference part
Talc or mineral filler preference if dimensional stability matters
Expected annual volume (helps cavity and tool planning)
Next step
Upload CAD for an instant quote
Grade not finalized? Note TPO on the RFQ and attach environment notes.
Compare and explore
Related guides
Pairwise comparisons and sibling material pages.
TPE family hub
Soft elastomer routing.
TPE family hubTPU
Abrasion-resistant elastomer.
TPUFlexible PVC
Plasticized vinyl for soft parts.
Flexible PVCPolypropylene
Rigid PP base resin.
PolypropyleneMaterials library
Browse all resin guides.
Materials libraryFAQ
TPO injection molding FAQ
What is the difference between TPO and TPE?
TPO is a PP-based blend that stays semi-rigid and is used for exterior and interior panels, while TPE covers soft elastomers for grips and seals. At NetProto, choose TPO when the part must hold shape and survive cold impact outdoors.
Can TPO parts be painted?
Yes, but polyolefins have low surface energy, so painted TPO usually needs an adhesion promoter, flame, or plasma treatment. At NetProto, note painting on the RFQ so DFM and secondary operations are planned together.
Why choose TPO over PP for exterior parts?
The elastomer phase in TPO improves impact at low temperature, where standard PP can turn brittle. At NetProto, share the coldest service temperature so DFM can confirm TPO versus an impact copolymer PP.
What is the minimum order quantity for molded parts at NetProto?
NetProto has no minimum order quantity on molded parts from your production tool. Upload CAD on the instant quote platform to scope tooling and part pricing for your volume.
How do I quote this resin without a final grade selected?
List the resin family on the RFQ, attach environment and compliance notes, and upload CAD. At NetProto, engineers use DFM review to narrow grades before tooling release.
Does NetProto publish processing parameters for TPO?
No. Processing windows and shrink values come from your supplier TDS for TPO. At NetProto, attach the grade datasheet to your project after DFM review.
Next step
Quote TPO parts with your CAD
Upload geometry and list TPO or the target grade on the instant quote platform.