SPI C1 finish
Stone matte versus blasted matte.
SPI C1 finishGlossary
What Is an SPI D2 Finish? Injection Molding Explained
SPI D2 is a medium bead blast band on the SPI chart for uniform matte cavities.
Glossary
SPI D2 is a medium bead blast finish with uniform matte appearance
Utility covers and hidden functional surfaces often reference D grades.
D2 creates consistent matte texture by blasting cavity steel with controlled media.
It hides tooling marks and minor scratches better than polished grades.
Cosmetic programs rarely use D2 on Class A faces unless styling demands uniform matte.
RFQ
When D2 makes sense on production tools
Pair SPI labels with the finish spoke when buyers need RFQ language.
- Underside brackets and internal covers not seen in use
- Large flat regions where gloss would show sink and flow
- Parts destined for paint where steel texture is acceptable
Go deeper
Where this term connects
Each link is a different angle on the same program, not a duplicate definition.
Bead blast spoke
RFQ notes for blasted finishes.
Bead blast spokeMatte finish spoke
Broader matte options.
Matte finish spokeVDI 3400
European texture numbering.
VDI 3400Visual 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
SPI D2 questions
Is D2 the same as bead blast finish spoke?
Concept aligns. The spoke adds RFQ detail for buyers.
Can D2 be repaired locally?
Blast zones may need rework to match surrounding texture.
Does D2 reduce draft needs?
No. Matte still increases pull versus polished steel.
Next step
Link SPI to finish hub
Upload CAD when hidden faces need D band blast specs.