Talc Fine Grade (d50 3µm, Reinforcing)
Key Features
- High aspect ratio (15:1–30:1) for superior reinforcing efficiency
- 30–60% flexural modulus increase at 10–30 wt% in UPR/epoxy systems
- Improved barrier properties for composite pipe and chemical-resistant tanks
- Platelet geometry minimizes warpage vs. glass fiber reinforcement
- Cost-effective alternative to short glass fiber in non-structural applications
Fine reinforcing talc with a median particle size of 3 µm and enhanced laminar morphology provides a significant step up in reinforcing efficiency over standard composites-grade talc. The finer particle size increases the number of platelet particles per unit volume and improves their orientation efficiency in thin-section molded parts, contributing to measurable improvements in flexural modulus, tensile strength, and heat distortion temperature.
In filled UPR, epoxy, and particularly thermoplastic compounds, fine reinforcing talc at 10–30 wt% can increase flexural modulus by 30–60% compared to unfilled resin, rivaling the reinforcing efficiency of some short glass fiber grades at significantly lower cost and without the processing complications associated with fibrous fillers. The isotropic reinforcing mechanism of platelet fillers also minimizes the warpage and anisotropy common with unidirectional fiber reinforcements.
Fine talc's high specific surface area and platelet geometry also contribute to improved barrier properties against moisture and gas permeation, making it valuable in composite pipe, tank liners, and chemical-resistant enclosures. Surface-treated grades (stearate, silane) are available for enhanced resin compatibility and reduced compound viscosity in demanding processing conditions.
Specifications
| Parameter | Value |
|---|---|
| Appearance | White to light gray powder |
| Aspect ratio | 15:1 – 30:1 (high aspect ratio laminar) |
| Top cut (d98) | ≤ 12 µm |
| BET surface area | 10–18 m²/g |
| Moisture content | ≤ 0.5% |
| Whiteness (R457) | ≥ 87% |
| Bulk density (tapped) | 0.2–0.4 g/cm³ |
| Loss on ignition (1000°C) | 4.5–5.5% |
| Median particle size (d50) | 3 µm |
Applications
FAQ
Both fine talc and wollastonite improve stiffness, but through different mechanisms. Wollastonite is needle-shaped (acicular) with aspect ratio 15:1–20:1 and primarily reinforces via fiber-like load transfer. Fine talc (platelet) reinforces via platelet orientation and barrier effect. At equal loading, wollastonite provides slightly higher tensile strength while fine talc provides better flexural modulus and lower warpage. The choice depends on the specific mechanical requirements of the application.
Direct Contact
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