Tensile strength
Tension limits on dumbbell coupons.
Tensile strengthGlossary
What Is Izod Impact Strength? Injection Molding Explained
Izod impact measures how much energy a notched molded bar absorbs when struck.
Glossary
Izod impact tests notch toughness when a pendulum strikes a molded bar
Impact values help compare grades but real parts differ from coupon geometry.
Sharp notches on production parts can fail differently than izod bars with standard notch.
Weld lines and gate regions often show lower effective toughness than pristine coupons.
Match the test method in your material spec to the failure mode you fear in service.
Glossary
How izod impact shows up on real programs
Library photos illustrate molding and tooling context for this term.
- Use the term in RFQs with geometry and material context, not in isolation.
- Link to the design guide when the term affects steel or part design.
- Upload CAD when the term changes tooling scope or piece price.
Design
Impact risk patterns on molded parts
Flag these before resin signoff.
Snap features with sharp internal corners
Living hinges oriented across flow
Drop loaded corners on handheld devices
Cold environment use below resin ductile range
Go deeper
Where this term connects
Each link is a different angle on the same program, not a duplicate definition.
Regrind
Property shift when regrind rises.
RegrindGate
Weld formation near impact zones.
GateDFM article
Radius and wall transitions.
DFM articleVisual reference
Photos from molding and tooling programs
Images are selected from the NetProto Forge media library for this topic.
Injection molded production parts on a tray
Injection molded production parts on a tray
Engineer reviewing a molded part drawing
Engineer reviewing a molded part drawing
Plastic housing components from a steel tool
Plastic housing components from a steel tool
FAQ
Izod impact questions
Which impact test matters for my part?
Match the method in your spec to expected failure mode.
Do thin walls match izod bars?
Effective toughness on thin sections needs design review, not bar data alone.
Does color masterbatch change impact?
Lot qualification catches shifts on critical programs.
Next step
Review snaps and hinges in DFM
Upload CAD with impact critical features marked.