SILICA FUME (MICROSILICA)

High-Performance Pozzolanic Material | Amorphous Silicon Dioxide (SiO₂)

Product Overview
Silica Fume, also known as Microsilica, is an ultra-fine, non-crystalline polymorph of silica produced as a by-product in the electric arc furnace during the production of elemental silicon or ferrosilicon alloys. Due to its extreme fineness and high amorphous silicon dioxide content, it acts as a highly effective pozzolanic material that significantly enhances the mechanical and durability properties of concrete and refractory castables.

Key Features

• Ultra-fine particles: 100 times finer than ordinary cement

• High Purity: SiO₂ content ranging from 85% to 98%

• High Surface Area: Typically 15–30 m²/g (BET)

• Bulk Density Options: Available in Densified (easier handling) and Undensified (better dispersion) forms

Technical Specifications

Applications

High-Performance Concrete (HPC)

• High Strength Concrete & Shotcrete: Increases compressive strength (8,000-20,000 psi) and flexural strength

• Durability: Reduces chloride ion permeability by up to 90%, protecting rebar from corrosion in marine structures and parking decks

• Abrasion Resistance: Ideal for industrial floors, bridge decks, and roadways

• Reduced Bleeding: Improves particle packing, resulting in smoother surface finishes

Refractory Castables

• Low & Ultra-Low Cement Castables: Acts as a microfiller to reduce water demand while improving flowability

• Mechanical Strength: Promotes mullite formation at high temperatures, increasing the strength profile of refractory linings

• Thermal Shock: Improves spalling resistance and extends service life of furnace linings

Other Industrial Uses

• Oil & Gas Well Cementing

• Ceramics & Fiber Cement Products

• Polymer & Elastomer Reinforcement

Advantages & Benefits

• Pozzolanic Reaction: Reacts with free calcium hydroxide (lime) in cement to form additional Calcium Silicate Hydrate (C-S-H), the glue that binds concrete

• Microfiller Effect: The sub-micron particles fill the voids between cement grains, creating a denser, impermeable matrix

• Cohesion: Increases the stickiness of the mix, reducing rebound loss in shotcrete applications

• Sustainability: Utilizes industrial by-products, contributing to LEED and green building standards

Quality & Compliance

• Standards Met: ASTM C-1240, AS/NZS 3582.3, JIS A 6207, CSA A3000

• ISO Certification: Manufacturing facilities comply with ISO 9001 (Quality) and ISO 14001 (Environment)

• Safety: Classified as a nuisance dust (amorphous). Does not cause silicosis like crystalline silica

Packaging & Storage

• Packaging Options:

  • Jumbo Bags: 500 kg, 1,000 kg (1 MT)

  • Paper Bags: 25 kg, 50 kg (with inner plastic liner for moisture protection)

  • Bulk: Pneumatic tanker trucks (Densified grade)

• Storage Instructions: Keep dry and protected from direct sunlight. Store away from fluorine compounds. Shelf life is unlimited if kept moisture-free