High-Purity Silica Components
With a SiO₂ content of at least 94%, it provides a higher-grade silica component for systems with low water-to-binder ratios, high-setting materials, and high-performance materials.
Product Details
94% Densified Silica Fume | Silica Fume SF-94D
Densified Silica Fume
Suitable for material systems with high requirements for raw material purity, formulation stability, and long-term performance, such as UHPC, RPC, high-strength concrete, marine bridges, and high-end precast components.
Micro-filling Effect
Volcanic Ash Reaction
Interface Enhancement
Grade Optimization
Silicon Dioxide
>= 94%
Apparent Color
Light gray to dark gray
Bulk Density
450-700 kg/m3
Application Systems
Concrete / Marine Engineering
Product Overview
High-purity, stable silica materials for high-performance formulations
94% Densified Microsilica is an ultrafine mineral material composed primarily of amorphous silicon dioxide. Compared to standard 85%, 90%, and 92% Densified Microsilica, the 94% grade places greater emphasis on raw material purity, impurity control, and batch consistency, making it suitable for high-performance formulations that are more sensitive to material variations.
Silicon Dioxide
>= 94%
Apparent Color
Light gray to dark gray
Bulk Density
450-700 kg/m3
Application Systems
Concrete / Marine Engineering
Product Advantages
Direct Production, Stable Quality
More consistent batch-to-batch quality
Control raw material sources, impurities, moisture content, and production fluctuations to minimize the impact of raw material variations on workability, strength, and construction stability.
Adaptation for High-Performance Systems
Suitable for formulation-sensitive applications such as UHPC, high-strength concrete, marine structures, high-end precast components, and concrete projects with stringent requirements.
High Loading Efficiency
The densified form has a higher bulk density, which improves space utilization in ton bags, warehouses, and containers, making it suitable for large-scale procurement and export shipments.
Technical Data
Chemical and Physical Properties
| Test Item | Typical Value | ASTM C1240 |
|---|---|---|
| SiO₂ Content | >= 94% | 85.0 % Minimum |
| Moisture Content | <= 2.0% | 3.0% Maximum |
| Loss on Ignition | <= 3.0% | 6.0% Maximum |
| Specific Surface Area | 15,000-30,000 m²/Kg | 15,000 m²/Kg |
| Bulk Density (Compacted) | 450-700 Kg/m³ | - |
| Activity Index (7 days) | 112.0 % | 105.0 % Minimum |
| Activity Index (28 days) | >= 118 % | - |
| Original particle size | 1.0 um | - |
| 45 μm sieve residue | 3.0 % | 10.0 % Maximum |
The data listed above is for reference only and does not constitute factory control specifications or acceptance criteria. Customers should conduct trials within their own systems to confirm product suitability.
Performance Comparison
Reference Test Data
Based on existing formulation tests, this section shows reference performance improvement from the micro-filling effect and pozzolanic reaction of silica fume. Actual results vary with matrix type, mix design, dosage, dispersion and process conditions, so sample testing is recommended.
Silica Fume Applications
Widely Used Across Industries
High-strength concrete (C100 and above)
Suitable for high-rise buildings, bridges, and special structures with high requirements for compressive strength, structural density, and long-term durability.
UHPC and RPC
Suitable for ultra-high-performance concrete systems with efficient forced mixing and adequate dispersion, it helps optimize the particle size distribution of the powder and the density of the matrix.
Offshore and Bridge Engineering
Suitable for ports, docks, cross-sea bridges, and coastal structures, it helps improve concrete’s resistance to water penetration and chloride ion ingress.
High-End Precast Components
Suitable for high-strength pipe piles, wind turbine towers, bridge components, UHPC slabs, and high-strength thin-walled precast products.
High-Performance Grout
Suitable for high-strength repair mortars with aggregates, specialty grouting materials, wear-resistant mortars, and functional materials with stringent requirements for pore structure.
Refractory Castable
Suitable for certain low-cement, ultra-low-cement, and SiC-containing refractory castables, helping to optimize matrix gradation, density, and workability.
Quality Control
Comprehensive Testing Available
ASTM C1240
EN 13263-1
GB/T 27690
COA and batch documentation
SGS can perform testing upon request.
Packaging and Logistics
Flexible Packaging, Supplied on Demand
Small-bag packaging
Suitable for small batches, experiments, and sporadic use.
Ton-bag packaging
Suitable for engineering projects and industrial use, and designed for both container loading and transshipment.
Bulk/Custom Packaging
Match pallets, labels, inner liners, and export documentation according to project requirements.
FAQ
Packaging, Loading and Shipping FAQ
Answers to common purchasing questions about packaging, export documents, sample trials, loading and delivery.
What is 94% densified Microsilica?
94% Densified Microsilica refers to an ultrafine siliceous material with a SiO₂ content of at least 94% that has undergone a densification process. The densification process increases bulk density, reduces space requirements for transportation and storage, and is suitable for high-performance concrete and refractory systems that require forced mixing.
What is the difference between 94% densified microsilica and 92% densified microsilica?
The main differences between the two lie in SiO₂ grade, impurity control, and product positioning. The 92% grade balances engineering performance with cost-effectiveness; the 94% grade places greater emphasis on raw material purity and batch consistency, making it suitable for formulation-sensitive applications such as UHPC, high-end precast components, and high-performance refractory materials.
What applications is 94% densified Microsilica suitable for?
94% Densified Microsilica is primarily suitable for UHPC, RPC, high-strength concrete (C100 and above), marine and bridge structures, high-end precast components, high-performance grouts, as well as low-cement, ultra-low-cement, and SiC-containing castables.
Can 94% densified Microsilica be used in UHPC?
Yes. 94% Densified Microsilica can be used in UHPC and RPC systems to help optimize powder gradation and matrix density. When using it, forced mixing, a proper feeding sequence, and compatible polycarboxylic acid superplasticizers should be employed to ensure that the densified agglomerates are fully dispersed.
Does 94% Microsilica definitely perform better than 92% Microsilica?
Not necessarily. SiO₂ content is only one of the factors affecting performance; the final outcome also depends on the reactivity of Microsilica, particle morphology, dosage, water-to-binder ratio, compatibility with water-reducing agents, degree of dispersion, and curing conditions. The main advantage of the 94% grade is that it provides a higher-purity and more stable raw material base for high-performance formulations.
How can you determine whether 94% densified Microsilica complies with ASTM C1240?
Compliance cannot be determined based solely on SiO₂ content. To confirm compliance with ASTM C1240, it is necessary to comprehensively evaluate test results such as moisture content, loss on ignition, 45-μm sieve residue, and pozzolanic activity index. When purchasing, please refer to the Certificate of Analysis (COA) and relevant test reports provided by MSILI for the corresponding batch.
Supply Capacity
Stable Delivery, Traceable Batches
9 +
Industry Applications
10+ years
Industry Application Experience
10000 +
Batch Tracking Records
50,000 +
Annual Supply Capacity (metric tons)
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