Natural Barium Sulfate 1250 Mesh - High Purity and Fine Particle Size for Coatings
Product Overview
Natural Barium Sulfate 1250 Mesh is a micronized, inert mineral filler derived from carefully selected barite ore, engineered to optimize coating performance through exceptional purity (>98.5%), ultra-fine particle size (D50: 2–3 μm), and narrow size distribution. Ideal for high-gloss industrial, automotive, and marine coatings, this additive improves film density, UV durability, and corrosion resistance while reducing TiO₂ dependency by up to 30%. Its low oil absorption (14–16 g/100g) and neutral pH ensure stable dispersion in solvent/water-based systems, meeting stringent VOC regulations (EU Directive 2004/42/EC) without compromising flow or leveling properties.
Technical Specifications
| Parameter | Specification | Test Method |
|---|---|---|
| Chemical Composition | BaSO₄ ≥98.5%, SiO₂ ≤0.8%, Fe₂O₃ ≤0.02% | XRF/ICP-OES |
| Particle Size | D50: 2–3 μm; D97: <10 μm | Laser diffraction (ISO 13320) |
| Brightness (ISO) | 92–94% (457nm reflectance) | ISO 2470-1 |
| Oil Absorption | 14–16 g/100g | ASTM D281 |
| Specific Gravity | 4.3–4.5 g/cm³ | ISO 787-10 |
| pH Value | 6.5–7.5 (10% aqueous suspension) | ISO 787-9 |
| Moisture Content | ≤0.3% | ASTM D280 |
| Thermal Stability | Decomposes at 1,580°C (no phase change <600°C) | TGA (ASTM E1131) |
| Heavy Metals | Pb <5ppm, Cd <1ppm (RoHS/REACH compliant) | ICP-MS |
Core Innovations
1. High-Density Particle Engineering
- Opacity enhancement:
- Refractive index of 1.64 improves TiO₂ efficiency (ASTM D2805).
- Reduces TiO₂ usage by 25–30% while maintaining equivalent hiding power.
- Barrier properties:
- Lamellar particle alignment blocks moisture/oxygen diffusion (ISO 7783-2).
- 40% lower water vapor transmission vs. calcium carbonate fillers.
2. Surface Modification Technology
- Stearic acid treatment:
- Hydrophobic coating (contact angle >95°) enhances moisture resistance.
- Lowers resin demand by 15% (ISO 3251).
- Zirconium coupling agents:
- Boosts adhesion to metal substrates (cross-cut test: ISO Class 0).
Performance Advantages
1. Coating System Optimization
| Property | Performance | Standard |
|---|---|---|
| Gloss Retention | 85GU @60° after 1,000h QUV-B | ASTM D523 |
| Salt Spray Resistance | 1,500h (no blistering, ASTM B117) | ISO 9227 |
| Abrasion Resistance | <10mg loss (1,000 cycles, CS-10 wheel) | ASTM D4060 |
| Chemical Resistance | Immersion in 5% H₂SO₄/NaOH – 30d intact | ISO 2812-2 |
2. Economic & Environmental Benefits
- Cost Reduction:
- Replaces 1kg TiO₂ with 3kg barium sulfate for equal opacity.
- Sustainability:
- Zero VOC contribution; 100% natural mineral extraction.
- Carbon footprint: 0.8kg CO₂/kg (cradle-to-gate, ISO 14040).
Industrial Applications
I. Automotive Coatings
- Basecoat/Clearcoat Systems
- Improves stone-chip resistance (GM9509P ≥9 rating).
- Enhances metallic flake orientation for premium aesthetics.
- E-Coat Primers
- Stable dispersion at pH 5.5–6.5 (Ford实验室测试 BI 130-01).
- Reduces cratering in ED baths.
II. Marine & Protective Coatings
- Anticorrosive Epoxies
- Synergizes with zinc phosphate for ISO 12944 C5-M compliance.
- Extends recoatability window to 72h (ASTM D7234).
- Antifouling Coatings
- Non-reactive with cuprous oxide biocides.
- Reduces leaching rate by 20% (IMO AFS Convention).
III. Decorative Paints
- High-Gloss Trim Paints
- Achieves DOI (Distinctness of Image) >90 (ASTM D5767).
- Minimizes brush marks via Newtonian flow behavior.
- Exterior Wall Finishes
- Withstands 50+ thermal cycles (-30°C to 70°C, EN 1062-21).
- Self-cleaning surface reduces dirt pickup (ISO 4628-3).
Formulation Guidelines
1. Recommended Loadings
| Coating Type | Barium Sulfate Content | Function |
|---|---|---|
| Primers | 20–35 wt% | Density, corrosion inhibition |
| Topcoats | 10–25 wt% | Gloss control, UV stabilization |
| Powder Coatings | 15–30 wt% | Edge coverage, flow enhancement |
2. Dispersion Protocol
- Premix: Combine with resin/solvent (3:1 ratio) for 15min @1,500rpm.
- Grinding: Process through bead mill (0.3mm zirconia beads) to Hegman 7.
- Post-Add: Introduce after pigments to prevent flocculation.
Packaging & Storage
1. Packaging Options
- Standard: 25 kg multi-ply paper bags with PE inner liner.
- Bulk: 1,000 kg FIBC bags (anti-static available).
2. Storage Requirements
- Humidity: <65% RH to prevent caking.
- Temperature: Ambient (15–30°C).
- Shelf Life: 36 months in original packaging.
Quality Assurance
- Certifications:
- ISO 9001:2015, ISO 14001:2015.
- REACH Annex XVII/CLP compliant.
- Batch Control:
- Laser particle size reports and XRD crystallinity analysis.
Competitive Advantages
- Density-Driven Performance: Higher specific gravity improves sag resistance.
- Universal Compatibility: Works with epoxy, alkyd, PU, and acrylic resins.
- Regulatory Compliance: Meets FDA 21 CFR 178.3297 for indirect food contact.
- Process Efficiency: 30% faster dispersion vs. precipitated barium sulfate.
Technical Support Services
- Opacity Optimization: TiO₂ replacement modeling software.
- Rheology Profiling: Viscometer testing for anti-settling formulations.
- Troubleshooting: SEM-EDS analysis of coating defects.
Conclusion
Natural Barium Sulfate 1250 Mesh redefines mineral filler economics by delivering multifunctional benefits that transcend traditional cost-saving roles. Its unique combination of high density, chemical inertness, and optical properties enables formulators to engineer coatings that excel in harsh environments while reducing reliance on expensive pigments. From luxury automotive finishes to deep-sea anticorrosive systems, this additive enhances durability, aesthetics, and regulatory compliance without compromising processability. As industries increasingly prioritize sustainability, its natural origin and low-carbon footprint position it as the responsible choice for next-generation coatings.
| Trade Name | 1250 Mesh Natural Barium Sulfate |
| Origin | Liaoning |
| Hazardous Chemicals | No |
| Manufacturer | Liaoning Dongyu |
| Package Specification | 25 kg per bag |
| Mesh | 1250 mesh |
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