Barium Sulfate (Barite, d50 5µm, High Density)
Key Features
- Extremely high density (4.48 g/cm³) for high-density composite design
- Very low oil absorption — minimal viscosity increase even at high loading
- Chemically inert to water, acids, alkalis — excellent chemical resistance
- X-ray opacity for radiation shielding and medical composite applications
- Brilliant white (≥95%) and compatible with all thermoset resin systems
Barium sulfate (BaSO₄), commercially known as barite or blanc fixe (precipitated grade), is an exceptionally dense white mineral filler with a specific gravity of 4.48 g/cm³ — approximately 1.6× denser than calcium carbonate. This high density is its primary distinguishing characteristic and the reason it is specified wherever high-density composites are required by design.
Ground barite (natural mineral) with a median particle size of 5 µm provides an excellent balance between high density, smooth surface finish, and good dispersibility in resin systems. The extremely low oil absorption of barite (typically 6–10 g/100g) means it can be loaded to very high levels (200–400 phr) in resin systems with relatively modest viscosity increase, enabling the production of high-density castings, ballast composites, and sound-deadening compounds.
Chemically, barium sulfate is among the most inert and chemically resistant minerals available. It is insoluble in water, acids, and alkalis, making it suitable for chemical-resistant coatings, radiation-shielding composites (attenuates X-rays), and acid-resistant pipe linings. Its high density and particle smoothness also contribute to superior X-ray opacity in medical composites. The white color and chemical inertness make it compatible with all thermoset resin systems.
Specifications
| Parameter | Value |
|---|---|
| Appearance | White powder |
| True density | 4.48 g/cm³ |
| Top cut (d98) | ≤ 20 µm |
| Oil absorption | 6–10 g/100g |
| BaSO₄ content | ≥ 97.0% |
| Moisture content | ≤ 0.2% |
| Whiteness (R457) | ≥ 95% |
| Bulk density (tapped) | 1.5–2.0 g/cm³ |
| Median particle size (d50) | 5 µm |
Applications
FAQ
Density calculation: ρ_composite = 1/(Σ(wᵢ/ρᵢ)) where wᵢ are weight fractions and ρᵢ densities. To achieve 2.0 g/cm³ in UPR (ρ=1.12): approximately 120–150 phr BaSO4 is needed. For 2.5 g/cm³: approximately 250–300 phr. For 3.0 g/cm³: approximately 450–500 phr. At such high loadings, surface treatment and dispersing aids are essential to maintain processability. Always conduct viscosity trials at target loading.
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