What Is Silica Fume?
Silica fume is a byproduct of producing silicon metal or ferrosilicon alloys. It is an ultrafine powder primarily composed of amorphous silicon dioxide (SiO₂) and is valued for its ability to enhance the performance of construction and refractory materials.
Key Applications
- Concrete: Improves strength, density, and durability.
- Refractories: Enhances thermal resistance and high-temperature performance.
- Shotcrete: Increases adhesion and reduces rebound loss.
- Oil & Gas Wells: Strengthens cementing slurries for extreme environments.
Factors to Consider When Purchasing
1. Purity
Choose silica fume with a high silicon dioxide content—typically above 85–95%—and minimal impurities such as carbon or alkalis.
2. Particle Size
A typical particle size ranges from 0.1 to 0.3 microns. Finer particles improve reactivity and performance in concrete or refractory mixes.
3. Packaging Options
Available in bulk bags, small bags, or as slurry. Select the packaging that suits your production scale and handling capabilities.
4. Standards & Certification
Ensure the product meets international standards such as ASTM C1240 or EN 13263 for consistent quality and performance.
5. Supplier Reliability
Work with reputable manufacturers or distributors who can provide test certificates, steady supply, and technical support.
Where to Buy Silica Fume
- Direct from Manufacturers: Ideal for bulk orders and custom specifications.
- Global B2B Platforms: Explore Alibaba, Made-in-China, or Global Sources for verified suppliers.
- Regional Distributors: For smaller or more urgent orders, local distributors may provide faster delivery.
Tips for B2B Buyers
Negotiate long-term contracts to secure stable pricing and supply.
Request recent quality certificates and a sample before large orders.
Confirm logistics and shipping options, especially for overseas transactions.
