Denser matrix
Fills microvoids and refines particle packing.
Silica fume grade
90% Undensified Silica Fume SF-90
Undensified Silica Fume
A 90% SiO₂ undensified silica fume engineered for high-strength grout, repair mortar and sprayed concrete. Its controlled agglomeration improves handling and transport while allowing rapid dispersion under normal mixing shear.
Controlled SiO₂
Easy to disperse
Traceable batches
Export-ready supply
Silicon dioxide
>= 90%
Appearance
Gray to light gray
Bulk density
280-400 kg/m3
Recommended applications
high-strength grout, repair mortar and sprayed concrete
Product Overview
Consistent reactivity without sacrificing dispersion
A 90% SiO₂ undensified silica fume engineered for high-strength grout, repair mortar and sprayed concrete. Its controlled agglomeration improves handling and transport while allowing rapid dispersion under normal mixing shear.
Fine amorphous particles fill capillary voids and support pozzolanic or ceramic bonding. Batch control covers chemistry, moisture, loss on ignition and bulk density (280–400 kg/m³). Ask MSILI to match the grade to your binder, dosage and process before scale-up.
Silicon dioxide
>= 90%
Appearance
Gray to light gray
Bulk density
280-400 kg/m3
Recommended applications
high-strength grout, repair mortar and sprayed concrete
Product Advantages
Direct Production, Stable Quality
Reliable mixing
Breaks down under normal mechanical shear without chemical binders.
Performance support
Can improve strength, impermeability and service durability when correctly formulated.
Stable sourcing
COA-backed lots and packaging options for trials or bulk production.
Technical Data
Chemical and Physical Properties
| Test Item | Typical Value | ASTM C1240 |
|---|---|---|
| SiO₂ Content | >= 90% | 85.0 % Minimum |
| Moisture Content | <= 1.8% | 3.0% Maximum |
| Loss on Ignition | <= 3.0% | 6.0% Maximum |
| Specific Surface Area | 15,000-25,000 m²/Kg | 15,000 m²/Kg Minimum |
| Bulk Density | 280-400 Kg/m3 | - |
| Activity Index (7 Days) | 113.0 % | 105.0 % Minimum |
| Activity Index (28 Days) | >= 118 % | - |
| Average 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 Grout
Improves packing density, compressive strength and impermeability in non-shrink grout and equipment-base grouting.
Waterproof Mortar
Refines capillary pores to support lower permeability, water resistance and long-term durability.
Repair and Strengthening Mortars
Supports bond strength, compressive performance and moisture resistance in concrete repair and structural strengthening systems.
Reactive Powder Concrete (RPC)
Improves matrix density, later-age strength, crack resistance and durability in standard RPC formulations.
Wear-Resistant Floors
Helps increase surface hardness, abrasion resistance and impact resistance in industrial and heavy-duty flooring.
Engineered Composites
Acts as a fine functional filler to improve packing, wear resistance, thixotropy and surface density while reducing batch variability.
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 bags
For samples, laboratory trials and controlled manual dosing.
Bulk bags
For project use and factory production, with efficient storage and container loading.
Custom export packing
Pallets, liners, marks and documents matched to the route and handling method.
FAQ
Packaging, Loading and Shipping FAQ
Answers to common purchasing questions about packaging, export documents, sample trials, loading and delivery.
What packaging sizes are available for Silica Fume?
Standard packaging options include small bags, ton bags, and pallet-wrapped film, as well as custom packaging tailored to project requirements. Specific specifications will be determined based on purchase quantity, feeding method, storage conditions, and shipping method.
What is 90% undensified Silica Fume?
90% Undensified Silica Fume is a highly reactive siliceous mineral admixture with an SiO₂ content of approximately 90%. It balances reactivity, dispersibility, and workability, and is commonly used in high-strength concrete, mortar, RPC, and applications aimed at improving structural durability.
What is the purpose of 90% Undensified Silica Fume?
90% Undensified Silica Fume can fill the pores between cement particles, improve the paste structure, and enhance the density, compressive strength, water resistance, crack resistance, and long-term durability of concrete or mortar.
What is the difference between undensified Silica Fume and Densified Silica Fume?
Undensified Silica Fume has a moderate bulk density, striking a balance between transport, storage, and dispersibility; Densified Silica Fume has a higher density and offers better transport efficiency, but requires greater dispersibility in certain systems. The undensified type is more suitable for engineering applications that require good dispersibility and workability.
What is the recommended dosage of 90% Undensified Silica Fume in concrete?
The specific dosage should be determined based on the mix design, strength class, and project requirements, and typically requires verification through trial mixing. When used in high-strength concrete, RPC, or waterproof mortar, the dosage should be adjusted comprehensively in consideration of the water-to-binder ratio, water-reducing admixtures, and workability.
What specifications should be considered when purchasing 90% Undensified Silica Fume?
It is recommended to focus on SiO₂ content, loss on ignition, moisture content, fineness, bulk density, activity index, dispersibility, and batch-to-batch consistency. For large-scale projects, attention should also be paid to supply stability, packaging methods, and actual mixing compatibility.
Supply Capacity
Stable Delivery, Traceable Batches
9 +
Application Segments
10+ years
Industry Experience
10000 +
Traceable Batches
50,000 +
Annual Supply Capacity
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