Microsilica (Silica Fume) – Technical Overview
Table of Contents
Executive Summary:
Microsilica, commonly known as silica fume, is an ultrafine amorphous silicon dioxide powder generated during the production of silicon and ferrosilicon alloys.
Due to its extremely fine particles and strong pozzolanic properties, it is widely used to enhance the strength, durability, and impermeability of high‑performance concrete and other cement‑based materials.
By filling microscopic voids and reacting with calcium hydroxide in cement, microsilica significantly improves compressive strength and resistance to chemical and environmental damage, making it essential for modern infrastructure projects.
The global market price of microsilica typically ranges between $30 and $50 per ton, depending on grade, packaging, and supply conditions. For competitive pricing and international shipping, visit:
Understanding Microsilica (Silica Fume):
Microsilica, also known as silica fume, is an ultrafine material rich in amorphous silicon dioxide (SiO₂), produced during the manufacturing of silicon metal and ferrosilicon alloys. Its extremely fine particles and high pozzolanic activity make it one of the most effective additives for improving concrete performance.
When added to cement-based materials, microsilica fills microscopic voids and reacts with calcium hydroxide to form additional binding compounds, resulting in higher strength, lower permeability, and improved durability.
Because of these properties, silica fume is widely used in high‑performance concrete, bridges, tunnels, marine structures, and industrial flooring applications worldwide.
Microsilica Properties:
Microsilica (Silica Fume) is known for its ultrafine particle size, high silicon dioxide content, and excellent pozzolanic activity.
These properties make it an essential additive for producing high‑strength and durable concrete in modern construction projects.
| Property | Typical Value |
|---|---|
| Chemical Composition | ≥ 85–96% SiO₂ |
| Particle Size | ~0.1 micron |
| Color | Gray to dark gray |
| Bulk Density | 200–700 kg/m³ |
| Specific Surface Area | 15–30 m²/g |
| Shape | Spherical particles |
| Pozzolanic Activity | Very High |
| Main Application | High‑performance concrete |
Benefits of Silica Fume in Concrete:
- Increases compressive and tensile strength of concrete
- Reduces permeability and water penetration
- Improves durability in harsh environments
- Enhances resistance to chemical and sulfate attack
- Reduces chloride ion penetration, protecting steel reinforcement
- Improves bond strength between cement paste and aggregates
- Produces denser and more durable concrete structures
Benefits of Silica Fume in Concrete:
1. High‑Performance Concrete (HPC):
Microsilica is widely used in high‑performance concrete to increase compressive strength, reduce permeability, and improve long‑term durability in demanding structural applications.
2. Marine and Coastal Structures:
Due to its ability to reduce chloride penetration and chemical attack, silica fume is commonly used in marine structures such as ports, bridges, and offshore platforms.
3. Bridges and Infrastructure:
Microsilica enhances structural durability and resistance to environmental stress, making it ideal for bridges, highways, tunnels, and large infrastructure projects.
4. Industrial Flooring:
Silica fume improves abrasion resistance and mechanical strength, which makes it suitable for heavy‑duty industrial floors and warehouses.
5. Precast and High‑Strength Elements:
In precast concrete production, microsilica helps achieve higher strength, improved surface finish, and reduced permeability in structural elements.
Microsilica Price Range:
The price of microsilica (silica fume) varies depending on factors such as purity, packaging type, density, and order volume.
Undensified microsilica is generally more expensive due to its higher handling and transportation costs, while densified grades are commonly used for bulk industrial applications.
| Product Type | Typical Price Range (USD) | Common Packaging |
|---|---|---|
| Densified Microsilica | 30– 45 per ton | Jumbo bags / Bulk |
| Undensified Microsilica | 40– 50 per ton | Jumbo bags |
| Premium Grade Microsilica | Custom pricing | Bulk orders |
Prices may vary based on quantity, destination port, and international shipping conditions. For updated pricing and worldwide supply, visit ferrosilicon.co.
Buy Microsilica with Worldwide Shipping:
High‑quality microsilica (silica fume) is available for global supply to meet the needs of construction companies, concrete producers, and industrial projects. This material is widely used in high‑performance concrete, marine structures, bridges, and infrastructure projects where durability and strength are essential. Microsilica is typically supplied in densified or undensified form and packaged in jumbo bags or bulk shipments to facilitate safe international transportation.
Reliable suppliers offer consistent quality, competitive pricing, and flexible shipping solutions to customers worldwide. Whether the requirement is for small orders or large‑scale bulk supply, international logistics and export documentation are usually arranged to ensure smooth delivery to destination ports.
For product specifications, price inquiries, and worldwide shipping information, you can contact:
Email: INFO@FERROSILICON.CO
Phone / WhatsApp: +98 912 168 4359
You can also visit ferrosilicon.co to learn more about available microsilica grades, packaging options, and export services.
Conclusion:
Microsilica (silica fume) is an important material in modern construction and concrete technology.
Thanks to its ultrafine particles and high pozzolanic activity, it significantly improves the strength, durability, and overall performance of concrete. By reducing permeability and enhancing resistance to chemicals, abrasion, and harsh environmental conditions, microsilica has become a key component in high‑performance and long‑lasting infrastructure projects.
Today, microsilica is widely used in bridges, marine structures, industrial flooring, precast elements, and other demanding applications where superior concrete quality is required.
With global supply options and competitive pricing typically ranging from 30to30 to 50 per ton, it remains a cost‑effective solution for improving concrete performance.
Frequently Asked Questions (FAQ):
1. What is microsilica used for?
Microsilica is mainly used in concrete and construction applications to improve strength, durability, and resistance to water and chemicals. It is also used in refractory and industrial products.
2. What is the difference between silica fume and microsilica?
Silica fume and microsilica are the same material. “Microsilica” is a commercial name commonly used in the construction industry.
3. How much microsilica should be added to concrete?
The typical dosage ranges from 5% to 15% of the cement weight, depending on the required concrete performance and project specifications.
4. Is microsilica suitable for marine structures?
Yes. Microsilica reduces concrete permeability and improves resistance to chloride penetration, making it ideal for marine and coastal structures.
5. What is the typical microsilica price range?
Microsilica prices generally range from 30to30 to 50 per ton depending on grade, packaging, and order volume.
6. Can microsilica be shipped internationally?
Yes. Microsilica is commonly supplied worldwide in jumbo bags or bulk shipments for construction and industrial projects.
