Is 1% shrink difference safe?
Not automatically; geometry and fill path matter.
Drop-in resin
Changing Injection Resin Without Changing the Mold
Buyers ask for drop-in resins when costs spike or supply shifts; the mold steel often stays unchanged.
Drop-in resin
Same cavity, new resin, new validation
Shrink, fill, and warp must be re-proven on T1 samples.
Buyers ask for drop-in resins when costs spike or supply shifts; the mold steel often stays unchanged.
Similar melt flow on a datasheet does not guarantee the same molded shrink or warp in your geometry.
Plan same-mold trials, conditioned measurements, and formal change control before production swap.
Quote checklist
Resin change checklist
Copy these fields into your RFQ or instant quote notes.
Document incumbent grade
Name proposed substitute grade
List critical dimensions
Require T1 CMM on conditioned parts
Examples
Risk signals
Weak callouts widen assumptions; specific grades tighten quotes.
| Field | Too vague | Better |
|---|---|---|
| Family change | ABS to PP | High dimensional risk |
| Same family grade | ABS to ABS | Moderate; still validate |
| Fill change | Unfilled to GF30 | High warp risk |
Instant quote
Change control
NetProto quote flow: upload, specify assumptions, review, submit.
- 1
Quote with both grades
If still deciding.
- 2
Run T1 on substitute
Same steel, documented process.
- 3
Compare CMM
Against incumbent baseline.
- 4
Update PO grade
After approval only.
FAQ
FAQ
Who owns validation?
Customer and molder share; supplier data supports but does not replace T1.
Color change only?
Easier than family change; still check cosmetics on T1.
Related
More RFQ guides
Links render in cards blocks only.
GF loading guide
Fill and tooling context.
GF loading guideReading a datasheet
Compare TDS rows.
Reading a datasheetInstant quote
New RFQ.
Instant quoteNext step
Start with CAD and material notes
Use the instant quote platform for pricing visibility tied to your geometry.