Typical ABS
- Higher stiffness and surface hardness for enclosures
- Better bond for paint and texture without extra prep
- More sensitive to thick sections and sink if ribs are oversized
Material comparison
ABS vs Polypropylene: Stiffness, Impact, and Cost in Molded Parts
ABS brings rigidity and a crisp surface for housings. Polypropylene stays tough in living hinges and wet environments at lower resin cost.
Material comparison
Commodity pair, different failure modes
Both resins mold well in production volumes. The wrong choice usually shows up as warp, creep, or chemical attack rather than fill issues.
Pick ABS when the part needs higher flex modulus and a paintable cosmetic surface.
Pick polypropylene when the part flexes repeatedly, sees detergents, or must stay low cost at high cavitation.
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 polypropylene
- Excellent fatigue resistance for snaps and hinges
- Lower density helps lightweight lids and containers
- Chemical resistance for automotive and consumer fluids
Decision table
Where each resin usually wins
Qualitative tradeoffs for molded parts. Confirm shrink, fill, and tooling details on the material guide.
| Factor | ABS | polypropylene |
|---|---|---|
| Stiffness | Higher flex modulus | Softer, more ductile |
| Impact | Good with moderate notch sensitivity | Very tough at thin walls |
| Chemicals | Avoid strong solvents | Stronger against many acids and bases |
| Cosmetics | Easier high gloss or textured show surfaces | Can show flow marks on large flats |
Before you quote
Send this context with your CAD
The instant quote uses your material choice for fill, gate, and steel assumptions.
Target environment (solvents, UV, temperature swing)
Cosmetic class (visible A surface vs internal)
Living hinge or snap count and deflection
Regulatory needs (food contact requires a stated grade on the PO)
Material guides
Full property pages
These library pages carry datasheets, DFM notes, and quote checklists.
ABS
Open the ABS molding guide.
ABSPolypropylene
Open the Polypropylene molding guide.
PolypropyleneContinue 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 libraryABS vs polycarbonate
When transparency or heat drives the choice.
ABS vs polycarbonatePP vs PE
Commodity olefin tradeoffs.
PP vs PEFAQ
Common questions
Can I overmold TPE on both?
Yes, with grade pairing reviewed in DFM. Surface energy differs, so the soft grip material must match the substrate.
Does either need drying before molding?
ABS and PP both need moisture controlled for stable fill. Note the resin supplier drying profile on the material guide.
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.