W14-PPIM-DECISION — Impact Modifier vs Grade Change vs Filler Reduction
1. What decision is the buyer trying to make?
Whether to solve PP brittleness by adding an impact modifier, switching the base PP grade (homo → copo), or reducing filler loading.
2. Which variables actually matter?
- Service temperature and required impact energy
- Current stiffness and HDT — and how much can be lost
- Current filler content and its role in the part
- Cost per kg of finished part
- Line qualification effort of switching base grade
3. Which variables are commonly misunderstood?
- Impact modifiers do not add impact "for free" — stiffness always moves.
- A copolymer grade change often solves the problem more cleanly than a modifier addition.
- High filler loading may be the real cause; reducing it can outperform adding a modifier.
4. What should the buyer investigate next?
A three-way controlled trial: current formulation vs modifier-added vs copo-grade switch, at the real service temperature.
5. What should be included in the RFQ?
PP grade + MFI · process · impact target (test + temperature) · acceptable stiffness/HDT loss · current filler content · regulatory scope · volume · benchmark grade.
Ending — Decision Graph Completeness
- Learned: three levers exist; only one is truly a masterbatch answer.
- Investigate next: which lever your service condition and cost model reward.
- RFQ prep: 8 items above.
Bridges
- W14-PPIM-ECO · W14-PPIM-PRODUCT
- W8 PP × Masterbatch · W13-A-003 · W14-TALC-DECISION