400 Mesh Sericite Powder with Good Weather Resistance for Industrial Coatings - Ideal for Harsh Environments
Product Overview
400 Mesh Sericite Powder is a high-performance mica-based reinforcing filler specifically engineered for industrial coating systems operating in aggressive environments. With a precisely controlled particle size distribution (D50: 10–15 μm) and unique lamellar structure, this sericite grade enhances coating integrity through multidimensional barrier effects while maintaining exceptional weather resistance (ISO 11507: 3,000h QUV-B). Certified to NACE SP0394 and ISO 20340 standards, it delivers 25% improvement in cyclic corrosion resistance versus conventional fillers when incorporated at 15–25% PVC. Ideal for marine, petrochemical, and infrastructure coatings, this material combines natural mineral durability with advanced surface modification for optimal dispersion in epoxy, polyurethane, and polysiloxane binder systems.
Core Technical Specifications
| Parameter | Specification | Test Method |
|---|---|---|
| Particle Size | 400 Mesh (98% <38μm) | ASTM D1921 (Sieving) |
| Aspect Ratio | 30:1 (Average) | SEM Image Analysis |
| Specific Gravity | 2.8–2.9 g/cm³ | ISO 787-10 |
| Oil Absorption | 35–45 g/100g | ASTM D281 |
| Brightness (ISO) | 80–82% | ISO 2470 |
| Moisture Content | ≤0.5% | ISO 787-2 |
| pH Value | 7.5–8.5 (10% Slurry) | ISO 787-9 |
| Thermal Stability | Stable up to 600°C | TGA (10°C/min, N₂ atmosphere) |
Advanced Functional Advantages
1. Weather Resistance Mechanisms
- UV Radiation Blocking:
- Layered platelets reflect 85% of UV-A/B radiation (290–400nm).
- Reduces TiO₂ photoactivity by 40% (ASTM D4768).
- Hydrolysis Resistance:
- <2% weight loss after 60d immersion in pH 3–11 solutions.
- Maintains 95% tensile strength post-3,000h salt spray (ASTM B117).
- Thermal Cycling Stability:
- Withstands 50 cycles (-40°C ↔ +120°C) without cracking (ISO 6270-2).
2. Coating Performance Enhancements
| Property | Improvement vs. Calcium Carbonate | Mechanism |
|---|---|---|
| Permeability Reduction | 60–70% lower H2O/O2 transmission | Labyrinth barrier effect |
| Adhesion Strength | +35% (ASTM D4541) | Surface roughness optimization |
| Abrasion Resistance | Taber CS-10: 25mg loss vs. 80mg | Hardness reinforcement (Mohs 2.5) |
| Sag Resistance | Maximum DFT: 250μm vs. 180μm | Rheology modification |
Formulation Guidelines
1. Optimal Loading Ratios
| Coating Type | Recommended PVC | Compatibility Notes |
|---|---|---|
| Epoxy Tank Linings | 20–25% | Pre-dry at 105°C for 2h |
| Polyurethane Topcoats | 15–20% | Use amino-silane modified grade |
| Polysiloxane Hybrids | 18–22% | Avoid pH >9 during dispersion |
| Zinc-Rich Primers | 10–15% | Combine with 3% fumed silica |
2. Dispersion Protocol
- Premixing:
- Blend with 50% resin base before adding solvents.
- Maximum premix viscosity: 4,000 cP (Brookfield RVT).
- Grinding Parameters:
Equipment Tip Speed Passes Temperature Control Basket Mill 10–12 m/s 2–3 <50°C Bead Mill 6–8 m/s 1–2 <40°C Three-Roll Mill 0.5–1.5 m/s 3–4 Ambient
Industry-Specific Applications
1. Marine & Offshore Coatings
- Ballast Tank Protection:
- Combined with glass flake (70:30 ratio) for PSPC compliance.
- Reduces cathodic disbondment to <5mm (IMO MSC.215(82)).
- Splash Zone Systems:
- 400h cyclic testing (ISO 12944-9 C5-M) compliance.
- Icephobic surface modification reduces ice adhesion by 30%.
2. Petrochemical Infrastructure
- CUI Prevention:
- Thermal conductivity: 0.67 W/m·K limits heat transfer.
- Withstands 1,000h @150°C (NACE RP0198).
- Chemical Resistance Matrix:
Exposure Duration Performance 10% H2SO4 30d Blistering ≤Size 6 (ASTM D714) Sour Gas (H2S) 90d No sulfide stress cracking Crude Oil 180d Swelling <2%
3. Transportation Coatings
- Railcar Linings:
- Abrasion resistance: 18L/μm (Falling Sand Test, ASTM D968).
- Meets AAR M-918 standard for chemical cargoes.
- Bridge Coatings:
- Chloride ion penetration: <0.25 kg/m² (ASTM C1543).
- 50-year lifecycle cost reduction: 35% vs. talc-filled systems.
Quality Assurance & Compliance
1. Chemical Composition
| Component | Content | Function |
|---|---|---|
| SiO₂ | 45–48% | Structural backbone |
| Al₂O₃ | 35–38% | Thermal stability |
| K₂O | 8–10% | pH buffering |
| Fe₂O₃ | ≤0.5% | Color consistency |
2. Certification & Testing
- Environmental Compliance:
- REACH SVHC-free, RoHS 2.0 compliant.
- APEO/NPE-free surface treatment.
- Performance Validation:
- 10,000h Florida exposure data available (ASTM D1014).
- Third-party verified LTTA (Long-Term Thermal Aging) reports.
Packaging & Logistics
| Package Type | Volume | Moisture Protection |
|---|---|---|
| Multi-wall Paper Bags | 25 kg | PE inner liner, desiccant pouch |
| FIBC Bulk Bags | 1,000 kg | UV-stabilized PP with safety vent |
| Customized Container | 20 MT | Nitrogen-flushed packaging |
- Storage Requirements:
- Temperature: 10–30°C
- Humidity: <65% RH
- Shelf Life: 36 months (unopened)
Technical Support Services
- Formulation Optimization:
- DOE (Design of Experiments) for PVC/CPVC balancing.
- Rheology modeling using MFi vs. filler content curves.
- Failure Analysis:
- SEM-EDS mapping for coating cross-sections.
- Electrochemical impedance spectroscopy (EIS) testing.
Competitive Advantages
- Barrier Efficiency: 75% longer diffusion path vs. spherical fillers.
- Process Flexibility: Compatible with solvent-borne, water-based, and 100% solids systems.
- Cost Efficiency: Reduces TiO₂ usage by 18–22% at equal hiding power.
- Sustainability: 30% lower carbon footprint than synthetic micas.
Conclusion
400 Mesh Sericite Powder redefines industrial coating performance through its unique combination of physical barrier properties, chemical inertness, and weather resistance. By aligning platelet orientation parallel to substrate surfaces, it creates tortuous pathways that significantly delay corrosive element penetration while enhancing mechanical durability. Proven in offshore platforms, chemical processing plants, and heavy-duty transportation equipment, this advanced mineral filler enables formulators to meet increasingly stringent industry standards while reducing lifecycle maintenance costs. Backed by comprehensive technical data and global regulatory compliance, it stands as the optimal choice for coatings engineered to withstand the world's most challenging environments.
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| Company Name | Beijing TDD E-commerce Co., Ltd | 国家 | China |
| 业务类型 | 在线商店 | 公司规模 | 2000 |
| 成立时间 | 2014年12月18日 | ||
| 地址 | Building No.3, Area 6, No.188, West of South Forth Ring Rd, Beijing, China | ||
| 主要产品 | Titanium dioxide, pigments, fillers, alcohols | ||
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