Cheap Silica Fume for Sale

Silica fume, also called microsilica, is a by‑product of silicon metal and ferrosilicon alloy production. It consists of amorphous silicon dioxide particles with an average diameter of 0.1 µm, giving it a very high specific surface area, typically between 15 000 and 20 000 m²/kg.

Typical Chemical Composition and Physical Properties

Production Process Overview

During electric arc furnace operation, silicon tetrachloride gas oxidizes and condenses into fine silica particles. The fume is collected via baghouse filters, then dried and optionally densified to improve handling characteristics. No additional chemical additives are introduced, preserving the amorphous SiO₂ nature.

Common Industrial Applications

• High‑performance concrete: silica fume reacts with calcium hydroxide to form additional C‑S‑H gel, increasing compressive strength and reducing permeability.
• Refractory castings: the fine filler improves packing density, leading to higher thermal shock resistance.
• Oil well cementing: low permeability slurry helps prevent gas migration and improves sheath integrity.
• Shotcrete and tunneling: enhanced cohesion reduces rebound and improves early‑age strength gain.

Quality Control and Testing

Each batch undergoes laser diffraction for particle size distribution, X‑ray fluorescence for SiO₂ quantification, and thermogravimetric analysis for LOI. Results are recorded against internal specifications; material outside the defined ranges is reprocessed or rejected.

Trace element analysis (e.g., Al, Fe, Ca) is performed periodically to ensure consistency, as variations can affect pozzolanic reactivity in concrete systems.

Packaging and Delivery Options

• 25 kg multi‑wall paper bags with inner polyethylene liner, suitable for small‑scale projects.
• 500 kg bulk bags (FIBC) with discharge spout, designed for silo feeding systems.
• Loose bulk transport in pneumatic tankers for large volume users, with optional moisture‑proof lining.

All packaging options include a desiccant packet to limit moisture uptake during storage, preserving the material’s reactivity.

Pricing and Lead Time Considerations

Price is influenced by order volume, packaging type, and destination. Typical lead time for standard 25 kg bags is 7‑10 business days after receipt of purchase order; bulk bag orders may require 10‑14 days due to palletizing and documentation.

Quotations are provided on a FOB basis; CIF or DAP terms can be arranged upon request, with freight costs calculated separately.

Frequently Asked Questions

Can the silica fume be customized for specific projects?

Yes. Particle size distribution can be adjusted via classification, and moisture content can be reduced through additional drying steps. Please provide target specifications when requesting a quote.

What information is needed for an accurate quotation?

Required details include desired quantity, packaging preference, delivery location, and any special testing or certification requirements (e.g., ASTM C1240, EN 13263‑1).

How is product quality verified before shipment?

Each lot is accompanied by a certificate of analysis showing SiO₂%, LOI, and particle size data. Third‑party inspection can be arranged at the buyer’s expense.

Get a Quote

To receive a detailed quotation, please provide your project specifications via the contact form. Our technical team will review the requirements and respond with pricing, lead time, and available options.