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

• W8 PP × Masterbatch · W10 Injection