Crystalline Silica / Quartz Powder (d50 15µm)
Key Features
- Excellent chemical resistance to all acids except HF — ideal for chemical process FRP
- High hardness (Mohs 7) improves abrasion and scratch resistance
- High modulus (~70 GPa) contributes to composite stiffness improvement
- Good electrical insulation properties and high-voltage arc resistance
- High SiO2 purity (≥99.5%) for predictable, consistent performance
Ground crystalline silica (quartz) powder with a median particle size of 15 µm is a widely used mineral filler in chemical-resistant composite systems, casting compounds, and specialty coating applications. Crystalline silica's high chemical resistance, excellent hardness (Mohs 7), and thermal stability make it suitable for demanding applications where softer minerals would be inadequate.
The angular, irregular particle shape of ground quartz improves mechanical keying and bonding at the resin-filler interface, enhancing abrasion resistance and scratch hardness in filled composites. In quartz-filled UPR systems, hardness and scratch resistance are significantly higher than CaCO3-filled systems, making it suitable for countertop surfaces, floor coatings, and wear-resistant composite panels. Quartz also has a higher modulus than most mineral fillers (~70 GPa), contributing to stiffness improvement.
Crystalline silica is the industry standard filler for acid-resistant FRP pipe and tank applications, where its insolubility in all acids (except HF) provides chemical inertness that organic and carbonate fillers cannot match. It is also used in electrical insulating composites, where its high volume resistivity and dielectric properties are advantageous. Important safety note: crystalline silica (quartz) carries a silicosis risk; proper dust controls including local exhaust ventilation and respiratory protection (minimum P2/N95 respirator) are mandatory during processing.
Specifications
| Parameter | Value |
|---|---|
| Appearance | White to off-white powder |
| True density | 2.65 g/cm³ |
| Mohs hardness | 7.0 |
| Top cut (d98) | ≤ 60 µm |
| SiO₂ content | ≥ 99.5% |
| Moisture content | ≤ 0.2% |
| Whiteness (R457) | ≥ 90% |
| Bulk density (tapped) | 1.1–1.3 g/cm³ |
| Median particle size (d50) | 15 µm |
| Crystalline silica (quartz) content | ≥ 98% |
Applications
FAQ
Crystalline silica (quartz, CAS 14808-60-7) is classified as a confirmed human carcinogen (IARC Group 1, silicosis/lung cancer) when inhaled as respirable dust (<10 µm particles). Mandatory precautions: local exhaust ventilation, wet processing methods where possible, respiratory protection (P2/FFP2/N95 minimum, ideally supplied air respirator), no dry sweeping (use wet cleaning or vacuum with HEPA filter), engineering controls to keep airborne dust below occupational exposure limits (e.g., China OEL: 0.5 mg/m³ respirable dust). Workers must receive training and regular medical surveillance.
Direct Contact
💬WhatsApp +86 156 3910 0440Telegram +86 156 3910 0440✉️[email protected]Reply within 24 hours
Related Products
Barium Sulfate (Barite, d50 5µm, High Density)
CAS 7727-43-7
Extremely high density (4.48 g/cm³) for high-density composite design
Calcined Kaolin (Anhydrous, d50 2µm)
CAS 1332-58-7
Anhydrous (LOI <0.5%) — suitable for moisture-sensitive resin systems
ATH Aluminum Trihydrate (Standard Grade, d50 8µm)
CAS 21645-51-2
Halogen-free flame retardant with simultaneous smoke suppression
3-Methacryloxypropyltrimethoxysilane (A-174 / KH-570)
CAS 2530-85-0
Methacrylate group reacts with UPR, VER, acrylic, and UV-curable resin systems