W14-TALC-DECISION — Choosing a Talc Grade: What Actually Changes the Outcome
1. What decision is the buyer trying to make?
Which talc grade to specify — given polymer, process, and the single property they most need to move.
2. Which variables actually matter?
- Aspect ratio and platelet size
- Top-cut (D97/D98) — controls specks and surface
- Brightness (only when colour/optics matter)
- Surface treatment (coupling for PP, stearate, none)
- Moisture / LOI
- Loading window compatible with process
3. Which variables are commonly misunderstood?
- "Whiter is better" — brightness only matters when the finished part shows it.
- "Higher aspect ratio always improves stiffness" — only in flow-oriented parts, and it can raise warpage.
- Surface treatment is not cosmetic; it changes coupling to PP and thus stiffness/impact balance.
4. What should the buyer investigate next?
Whether their process (gate location, cooling, orientation) will let a high-aspect-ratio grade express its advantage — or whether a mid-aspect coupled grade is the safer path.
5. What should be included in the RFQ?
Polymer + MFI · process · target property · loading window · top-cut constraint · surface treatment requirement · brightness constraint · regulatory scope · volume · benchmark grade in use.
Ending — Decision Graph Completeness
- What you learned: talc is a geometry-driven filler; grade choice is dominated by aspect ratio, top-cut and surface treatment.
- What to investigate next: whether your process actually rewards the geometry you are paying for.
- RFQ prep: the 10 items above.
Bridges
- W14-TALC-ECO · W14-TALC-PRODUCT
- W13-A-003 CaCO₃ vs Talc (decision-surface owner)
- W8 PP × Masterbatch · W10 Injection