Micro Silica
Velosit MS 9902 – Densified Micro Silica (Silica Fume) Supplier in India
Innovation Meets Concrete Excellence
Velosit MS 9902 is a densified micro silica — also known as silica fume — designed to transform concrete performance for high-demand applications. It is a super-fine, amorphous, high silica-content pozzolanic powder produced through advanced processing and densification techniques.
Meeting ASTM C1240:2020, IS 1727:1967 & IS 15388:2003 standards, Velosit MS 9902 is trusted by engineers, architects, and contractors for delivering exceptional strength, impermeability, and durability in high-performance concrete (HPC), marine structures, precast elements, and other demanding construction environments.
By replacing a portion of cement in the mix, Velosit MS 9902 also supports sustainable construction, reducing CO₂ emissions without compromising on quality.
Why Choose Velosit MS 9902 Micro Silica?
- Exceptional Strength
Enhances compressive and flexural strength, enabling structures to withstand higher loads and more demanding service conditions.
- Enhanced Durability
Provides superior protection against:
- Weathering from temperature changes and moisture
- Abrasion in high-traffic areas
- Chemical attack in aggressive industrial and marine environments
- Improved Rheology & Workability
Increases cohesiveness, reduces bleeding and segregation, and supports a smoother surface finish — ideal for Self-Compacting Concrete (SCC) and precast applications.
- Shrinkage Control
Minimizes micro-cracking by reducing drying shrinkage, extending the service life of the structure.
- Eco-Friendly Advantage
Replaces part of the cement content, reducing raw material usage and contributing to a lower environmental footprint.
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How Velosit MS 9902 Works
Velosit MS 9902 works through a pozzolanic reaction, where its ultra-fine particles react with calcium hydroxide in the cement paste to form additional calcium silicate hydrate (C-S-H) gel.
This reaction:
- Fills micro-voids in the concrete
- Creates a denser, impermeable matrix
- Blocks the pathways for water, chlorides, and sulphates
- Improves long-term chemical stability
The densified form ensures:
- Reduced dust during handling
- Improved storage efficiency
- Better dispersion in the concrete mix
Technical Specifications
Property | Value |
Form | Free-flowing densified powder |
Color | Dark grey |
SiO₂ Content | 90% ± 1-2% |
Dry Bulk Density | 620 kg/m³ ± 20 |
Specific Gravity | 2.3 ± 0.1 |
Specific Surface Area | 22.5 m²/g ± 7.5 |
Moisture Content | <0.35% |
Loss on Ignition | 3.0% ± 1.0 |
Retention on 45μ Sieve | 5 % ± 2.0 |
Fire Rating | Class A1 (EN13501-1) |
Recommended Dosage | 5–12 % by weight of cement |
Packaging | 25 kg bags / bulk on request |
Application Fields
Velosit MS 9902 is suitable for a wide range of construction applications where strength, impermeability, and durability are critical:
- High Performance Concrete (HPC)
- High Strength Concrete (HSC)
- Precast & Cast-in-Situ Elements
- Marine & Coastal Structures – piers, jetties, bridges, ports
- Oil, Gas & Petrochemical Facilities
- Below-Grade Structures – basements, tunnels, foundations
- High Abrasion Surfaces – industrial floors, bridge decks, concrete roads
Compliance & Compatibility
Standards
Velosit MS 9902 conforms to:
- ASTM C1240:2020
- IS 1727:1967 (RA 2013) & IS 15388:2003 (RA 2022)
Admixture Compatibility
Compatible with:
- Water reducers & PCE-based superplasticizers
- Retarders & accelerators
- Rheology modifiers
- Air entrainers & slump extenders
Addition Methods
Powder Addition
Add MS 9902 with aggregates and sand before adding cement, water, and admixtures. Mix for at least 30 seconds before cement addition.
Slurry Addition
Slurry preparation on-site improves dispersion. Use quality slurrying equipment with suspension additives. Add slurry with the final 25% of mixing water and mix for at least 30 seconds.
Dosage Guidelines
Typical dosage range: 5–12 % by weight of cement.
Final dosage should be determined through trial mixes based on
- Project requirements
- Target performance
- Environmental exposure conditions
Storage & Shelf Life
- Store in dry, shaded areas at 5–35°C
- Shelf life: 24 months in original unopened packaging
Benefits in Different Applications
Marine Structures
- Reduces chloride penetration, preventing rebar corrosion
- Improves resistance to sulphate attack
Precast Concrete
- Enhances surface finish and dimensional accuracy
- Reduces permeability for longer service life
Industrial Floors
- Increases abrasion resistance for high-wear environments
- Improves impact resistance in heavy-load areas
High-Rise Construction
- Achieves high compressive strength for slender structural members
- Improves pumpability for tall pours
FAQs
Q1: Is Velosit MS 9902 ASTM/IS compliant?
Yes — regularly tested to conform with ASTM C1240:2020,IS 1727-1967 & IS 15388:2003 standards.
Q2: What is the typical dosage for micro silica?
Between 5–12 % by weight of cement, confirmed via trial mixes.
Q3: Can it be used in marine structures?
Yes — it significantly reduces chloride and sulphate ingress.
Q4: What is the advantage of densified micro silica?
Reduces dust, improves handling, and optimizes storage space.
Q5: Does it improve workability?
Yes — it enhances rheology and cohesiveness, reducing bleeding and segregation.
Ready to elevate your concrete performance?
Contact Velosit India today for TDS, MSDS, bulk pricing, and technical support.
📞 +91-86920 66664
📧 info@velositindia.com
🌐 www.velositindia.com