Denser matrix
Fills microvoids and refines particle packing.
Silica fume grade
85% Undensified Silica Fume SF-85
Undensified Silica Fume
A 85% SiO₂ undensified silica fume engineered for ready-mix concrete, dry mortar and general refractories. 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
>= 85%
Appearance
Gray to light gray
Bulk density
200-400 Kg/m3
Recommended applications
ready-mix concrete, dry mortar and general refractories
Product Overview
Consistent reactivity without sacrificing dispersion
A 85% SiO₂ undensified silica fume engineered for ready-mix concrete, dry mortar and general refractories. 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 (200–400 kg/m³). Ask MSILI to match the grade to your binder, dosage and process before scale-up.
Silicon dioxide
>= 85%
Appearance
Gray to light gray
Bulk density
200-400 Kg/m3
Recommended applications
ready-mix concrete, dry mortar and general refractories
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 | >= 85% | 85.0 % Minimum |
| Moisture Content | <= 2.0% | 3.0% Maximum |
| Loss on Ignition | <= 4.0% | 6.0% Maximum |
| Specific Surface Area | 15,000-25,000 m²/Kg | 15,000 m²/Kg Minimum |
| Bulk Density | 200-400 Kg/m3 | - |
| Activity Index (7 Days) | 110.0 % | 105.0 % Minimum |
| Activity Index (28 Days) | >=115 % | - |
| 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 Concrete
Improves particle packing, matrix density and compressive strength in bridges, high-rise structures and high-strength precast elements.
Dry-Mix and Specialty Mortars
Supports denser repair mortars, grouts and wear-resistant mortars with improved bond performance and long-term durability.
Oil-Well Cementing
Reduces cement-stone porosity and supports impermeability and thermal stability in oil- and gas-well cementing systems.
Shotcrete
Improves cohesion and adhesion, helping reduce rebound and increase build thickness during spray application.
Pumpable Concrete
Supports workability and cohesion during long-distance pumping and large-volume placement in high-rise, bridge and underground projects.
Industrial Floors
Helps increase surface density, abrasion resistance and crack resistance in warehouses, plants, logistics facilities and parking structures.
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.
Where is SF-85 silica fume used?
It is the cost-effective choice for ready-mix concrete, dry mortar and general refractories, where practical strength, impermeability and durability matter more than ultra-low impurity levels.
Why choose SF-85 instead of another silica-fume grade?
Choose it when the specification does not require high-purity ceramic or extreme-temperature performance; moving to 92% or above should be justified by impurity limits or test results.
What does undensified SF-85 mean for transport and mixing?
Undensified here means controlled physical agglomeration, not a chemical binder. With a bulk density of 200–400 kg/m³ it improves loading and handling, while normal mechanical shear breaks the agglomerates down during mixing.
What dosage or formulation method is recommended for SF-85?
For conventional cementitious systems, 5–10% of total binder is a common trial range. Rebalance water reducer and water-to-binder ratio, then confirm strength, flow and permeability.
Which specifications should be checked before buying SF-85?
Check SiO₂, moisture, loss on ignition, bulk density, particle-size or fineness data and application-relevant activity. Confirm the current lot on the COA and validate it with the actual binder or resin system.
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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