Overview of Fumed Silica

Fumed silica, also known as pyrogenic silica, is an ultra-fine, high-purity amorphous silicon dioxide (SiO2) produced via the combustion of silicon tetrachloride in an oxygen-hydrogen flame. It appears as a fluffy white powder and is valued for its ability to thicken, stabilize, and reinforce materials.

Features of Fumed Silica

• High Surface Area: Typically ranges from 50 to 380 m²/g, providing excellent thickening and reinforcing properties.
• Hydrophilic or Hydrophobic Variants: Available in both forms depending on surface treatment, allowing for tailored applications.
• Excellent Thixotropy: Increases viscosity and improves flow properties of liquids and pastes.
• Chemical Inertness: Resistant to most chemicals, making it suitable for a wide range of industrial uses.

•  Enhances free-flowing properties and stability.

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Specification of High Quality Microsilica SiO2 Powder Grey Silica Fume Micro Silica Powder

High-Quality Microsilica SiO2 Powder (Grey Silica Fume/Micro Silica Powder) is a premium industrial material derived as a byproduct of silicon metal and ferrosilicon alloy production. Known for its ultrafine particle size and high reactivity, it is widely used to enhance the performance of concrete, refractory materials, and specialized chemical applications. Below are the key specifications and features of this product:

Chemical Composition: The powder consists of 92–98% amorphous silicon dioxide (SiO2), ensuring exceptional purity and reactivity. Trace elements include aluminum oxide (Al2O3, 0.5–1.5%), iron oxide (Fe2O3, 0.2–1.5%), calcium oxide (CaO, 0.1–0.5%), magnesium oxide (MgO, 0.5–1.5%), and potassium oxide (K2O, 0.5–1.5%). Loss on ignition (LOI) is typically ≤3%, indicating low moisture and carbon content.

Physical Properties: The particles are spherical and extremely fine, with an average diameter of 0.1–0.3 microns. This results in a high specific surface area of 15,000–25,000 m²/kg, contributing to superior pozzolanic activity. The bulk density ranges from 200–350 kg/m³ (loose state) and 300–500 kg/m³ (densified). The material appears as a light to dark grey powder, free of visible impurities.

Performance Benefits: In concrete, microsilica improves compressive strength, abrasion resistance, and durability by reducing permeability and mitigating alkali-silica reaction (ASR). It enhances bond strength with cement particles and fills micro-voids, creating a denser matrix. For refractory applications, it boosts thermal shock resistance and corrosion stability. The powder also serves as a filler in polymers, coatings, and adhesives, improving chemical resistance and mechanical properties.

Packaging & Storage: Available in 25 kg woven bags with moisture-resistant liners, 1-ton jumbo bags, or customized packaging. Store in a dry, cool environment away from direct sunlight and humidity to prevent clumping.

Safety & Handling: Use appropriate PPE (gloves, masks, goggles) to avoid inhalation or contact with skin. The fine particles may cause respiratory irritation if mishandled. Comply with local regulations for disposal and transport.

This high-purity microsilica powder meets international standards such as ASTM C1240, EN 13263, and ISO 9001, ensuring consistency for construction, metallurgy, and chemical industries. Its versatility and performance make it indispensable for projects demanding enhanced material durability and longevity.

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Applications of High Quality Microsilica SiO2 Powder Grey Silica Fume Micro Silica Powder

High-quality microsilica SiO2 powder, also known as grey silica fume or micro silica powder, is a versatile material with a wide range of industrial applications due to its unique physical and chemical properties. This ultrafine powder, composed primarily of amorphous silicon dioxide (SiO2) with particles averaging 0.1–0.3 microns, is a byproduct of silicon metal and ferrosilicon alloy production. Its high surface area, reactivity, and pozzolanic characteristics make it a valuable additive in multiple sectors.

In the construction industry, microsilica is widely used to enhance the performance of concrete and cementitious materials. When added to concrete mixes, it fills microscopic voids, reduces permeability, and increases compressive strength, durability, and resistance to chemical corrosion. This makes it ideal for high-stress infrastructure like bridges, dams, marine structures, and industrial floors. It also improves the bond strength of shotcrete, reducing rebound in tunneling and mining applications.

The refractory industry relies on microsilica to produce high-temperature-resistant materials. Its inclusion in refractory castables and bricks enhances thermal shock resistance, density, and mechanical strength, extending the lifespan of furnaces, kilns, and incinerators.

In the chemical and coatings sectors, microsilica acts as a functional filler in paints, adhesives, and polymer composites. Its fine particles improve abrasion resistance, UV stability, and viscosity control, while also providing anti-corrosion and fire-retardant properties.

Oil and gas operations utilize microsilica in well cementing to create durable, impermeable cement slurries that withstand high-pressure, high-temperature (HPHT) conditions, preventing gas migration and ensuring well integrity.

Additionally, microsilica is used in advanced ceramics, electronics, and environmental applications, such as wastewater treatment, where its adsorption properties help remove heavy metals and pollutants.

Produced under strict quality control, high-purity microsilica powder ensures consistency, low carbon content, and minimal impurities, making it a sustainable choice that repurposes industrial byproducts. Its adaptability across industries underscores its role as a critical material for improving product performance, longevity, and environmental efficiency. Whether for construction, manufacturing, or energy sectors, microsilica SiO2 powder delivers unmatched technical benefits and cost-effectiveness.

Company Introduction

Welcome to HiphopGalaxy, a trusted global supplier of high-quality silicon dioxide (SiO2) powder, renowned for its exceptional purity and performance. Established with a vision to deliver cutting-edge materials that meet the diverse needs of modern industries, we have positioned ourselves as a leading player in the international market.

Our SiO2 powders find applications across multiple sectors, including adhesives, coatings, pharmaceuticals, cosmetics, polymers, and electronics. Each application benefits from the unique properties of our products—high surface area, excellent thixotropy, chemical inertness, and superior reinforcement capabilities. Whether you need hydrophilic or hydrophobic variants, we offer tailored solutions to meet your specific requirements.

If you have any questions, please feel free to contact us(nanotrun@yahoo.com).

Payment Methods

T/T, Western Union, Paypal, Credit Card etc.

Shipment Methods

By air, by sea, by express, as customers request.

5 FAQs of High Quality Microsilica SiO2 Powder Grey Silica Fume Micro Silica Powder

What is High Quality Microsilica SiO2 Powder? High Quality Microsilica SiO2 Powder, also known as silica fume or micro silica, is a fine, grey-colored powder composed of amorphous silicon dioxide (SiO2). It is a byproduct of silicon and ferrosilicon alloy production, collected from the gases released during electric arc furnace processes. Due to its ultra-fine particle size and high SiO2 content (typically 85–98%), it is widely used to enhance the strength, durability, and workability of concrete, refractory materials, and other industrial applications.

Why is silica fume used in concrete? Silica fume improves concrete performance by filling microscopic gaps between cement particles, resulting in a denser matrix. This reduces permeability and increases compressive strength, chemical resistance, and abrasion resistance. Additionally, its pozzolanic reaction with calcium hydroxide in cement forms additional calcium silicate hydrate (C-S-H), enhancing long-term durability. It is particularly useful in high-performance concrete for bridges, marine structures, and high-rise buildings.

How should microsilica powder be stored and handled? Store microsilica in a dry, cool, and well-ventilated area, away from moisture and direct sunlight. Use sealed containers or moisture-resistant packaging to prevent clumping. During handling, wear protective gear like gloves, goggles, and N95 masks to avoid inhalation or skin contact, as the fine particles can irritate the respiratory system and eyes.

What is the typical dosage of microsilica in concrete mixes? The recommended dosage ranges from 5% to 15% of the cement weight, depending on the application. For high-strength concrete, 7–10% is common, while refractory materials may require up to 15%. Overdosing can reduce workability, so superplasticizers are often added to maintain mix consistency. Always follow industry standards or consult technical guidelines for optimal results.

Are there safety precautions for using silica fume? Yes. Inhalation of airborne particles poses health risks, including silicosis or lung irritation. Use PPE (respirators, gloves, goggles) and ensure proper ventilation in workspaces. Avoid skin contact by wearing long sleeves and washing exposed areas after use. Spills should be cleaned with vacuum equipment, not dry sweeping, to minimize dust dispersion. Compliance with local safety regulations is critical.

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