Silica Fume Supplier China | ASTM C1240 Microsilica — Grade 85 / 90 / 92
Bulk and bagged microsilica supplied directly from verified Chinese production sources. Compliant with ASTM C1240 and GB/T 18736. FOB / CIF from major Chinese ports.
Supplied to ready-mix plants, precast manufacturers, refractory producers, and infrastructure contractors across North America, Europe, the Middle East, Southeast Asia, and Africa. Batch-specific COA and MTC are provided as standard; third-party inspection can be arranged before loading.
Higher Strength & Lower Permeability
5–15% silica fume addition significantly increases compressive strength and dramatically reduces water permeability — critical for long-service-life structures.
Sulfate & Chloride Resistance
Essential for marine, coastal, and chemically aggressive environments. Specification-grade purity verified by third-party testing on every shipment.
Verified Source, Stable Supply
Long-term contracts with established Chinese production facilities. Consistent quality and reliable shipment schedules — not spot-market sourcing.
Densified & Undensified Available
Both forms stocked. Densified for easier handling and bulk transport; undensified for applications requiring maximum reactivity.
Flexible Packaging & Incoterms
25 kg bags, 1 MT jumbo bags, or bulk vessel loading. FOB, CIF, and CFR available from Tianjin, Qingdao, Shanghai, and Lianyungang.
Full Export Documentation
Batch-specific COA, MTC, CO and MSDS are available. SGS / BV / CIQ inspection can be arranged before loading when required.
Specifications by Grade
Three SiO₂ activity grades aligned with ASTM C1240 and GB/T 18736 requirements. Grade 90 is the most widely specified grade for ready-mix, precast, and marine concrete applications worldwide.
| Parameter | Test Standard | Grade 85 | Grade 90 | Grade 92 |
|---|---|---|---|---|
| SiO₂ Content (min) | ASTM C1240 / GB/T 18736 | ≥ 85% | ≥ 90% | ≥ 92% |
| Specific Surface Area | BET | 15,000 – 25,000 m²/kg | ||
| Average Particle Size | Laser Diffraction | 0.1 – 0.2 μm | ||
| Bulk Density (Densified) | ISO 6274 | 500 – 700 kg/m³ | ||
| Pozzolanic Activity Index (min) | ASTM C1240 | ≥ 95% | ≥ 100% | ≥ 105% |
| Moisture Content (max) | EN 196-2 | ≤ 3% | ||
| Loss on Ignition (max) | EN 196-2 | ≤ 10% | ≤ 8% | ≤ 6% |
| Chloride Content (max) | EN 196-2 | ≤ 0.02% | ||
* Typical values from production. Batch-specific COA issued with every shipment.
Where Our Customers Use Silica Fume
From offshore platforms in the Gulf to tunneling projects in Southeast Asia — microsilica is specified wherever strength, impermeability, and long service life are non-negotiable.
High-Performance Concrete
High-rise structures, long-span bridges, and infrastructure requiring C60+ mix designs.
Marine & Offshore Structures
Platforms, jetties, sea walls exposed to chloride-rich environments.
Tunneling & Shotcrete
Rapid strength gain and adhesion for tunnel linings and underground works.
Precast & Prestressed Concrete
Improved surface finish, reduced efflorescence, consistent quality at scale.
Refractory & Industrial Castables
High-temperature applications requiring bonding and thermal stability.
Oil Well Cementing
Enhanced slurry density and impermeability for demanding downhole conditions.
Packaging, Ports & Payment
Flexible packaging and incoterms to match your project size and discharge facilities.
Packaging Options
- 25 kg PP / paper bags, palletized & shrink-wrapped
- 1,000 kg / 1,500 kg jumbo bags (FIBC) with PE liner
- Bulk loading into vessel holds (500+ MT)
- 20' / 40' container loading available
- Custom private-label bagging on request
Loading Ports
- Tianjin / Xingang Port (primary)
- Qingdao Port
- Shanghai Port
- Lianyungang Port
- Bulk vessels and container shipments arranged
Payment Terms
- 30% T/T deposit, 70% balance against B/L copy
- L/C at sight (irrevocable, from prime banks)
- D/P, D/A negotiable for established buyers
- Trial orders accepted to build long-term relationships
Documentation Provided
- Commercial Invoice & Packing List
- Bill of Lading (B/L)
- Certificate of Origin (CO / Form A / FORM E)
- Mill Test Certificate (MTC) & COA per shipment
- SGS / BV / CIQ inspection on request
20+ Years of Export Experience
China is the world's dominant producer of silicon metal and ferrosilicon. Miningsun has direct access to consistent, high-purity microsilica from established production facilities — and the export logistics expertise to deliver it reliably, anywhere.
- Verified production sourcing — long-term contracts with major Chinese silicon furnace operations
- Third-party tested — ASTM C1240 / GB/T 18736 with COA on every shipment
- Stable pricing — quarterly fixed-price contracts available for repeat buyers
- Reliable lead times — 15–25 days from PO to vessel loading
- Multi-port loading — Tianjin, Qingdao, Shanghai, Lianyungang
- Export documentation — full set including CO, MTC, MSDS, fumigation as required
- Responsive sales team — quotes within 24 hours, English / Chinese / Spanish
Frequently Asked Questions
What is the difference between densified and undensified silica fume?
What is the typical dosage rate for silica fume in concrete?
Which grade should I specify — Grade 85, 90, or 92?
What is the minimum order quantity (MOQ) for silica fume?
Can you provide a free sample before I place an order?
Technical & Compliance Documents
Available to qualified buyers upon request — please specify Grade and quantity when reaching out.
What Buyers Usually Check Before Ordering
For repeat and first-time buyers, we can prepare the key quality and shipment evidence needed for internal approval before PO confirmation.
- Batch-specific COA and MTC for the selected grade
- MSDS, TDS, packing list and commercial invoice draft
- Bag marking, batch number photos and loading photos/video
- Density, color consistency, moisture and LOI confirmation
- Optional SGS / BV / CIQ inspection before loading
- FOB, CIF or CFR quote based on quantity and destination port
Request a Quote or Sample
Tell us the required grade, quantity, destination port, packaging, required standard and target shipment date. We will respond with FOB/CIF pricing, lead time and available document samples within 24 hours.
Request FOB/CIF Price & COA Sample Or email us directly: info@miningsun.com · WhatsApp: +1 814 515 0096Silica Fume documents, RFQ and buyer notes
Use this section after reviewing the product summary above: open public PDF files, send a fast RFQ, or check the short buyer notes before ordering.
Documents
8 public PDFsBuyer notes
On fileContinue comparing Silica Fume
How to source Silica Fume from China
Use these notes to compare supplier quotes quickly: grade, standard, packing, loading port and documents should be checked before confirming price.
Silica Fume applications
Silica Fume / Microsilica is supplied for high-performance concrete, shotcrete, precast and refractory mixes. Buyers usually confirm the target grade, dosage or particle size against the project specification before final quote.
Standards and grade range
Common reference standards include ASTM C1240 / EN 13263 / GB/T 18736. Available grade range: Grade 85 / 90 / 92, densified or undensified.
Packing, MOQ and loading
Typical export packing: 25 kg bags, 1 MT / 1.5 MT jumbo bags or bulk. MOQ: 1 MT trial order; FCL recommended. Quotes are prepared from FOB Tianjin, Qingdao, Shanghai or Lianyungang with estimated lead time of 15-25 days after PO confirmation.
Documents and inspection
PDF COA, TDS and MSDS samples; latest batch COA issued against confirmed lots. Public PDF samples are shown on this page. Batch COA, inspection files and shipment documents are confirmed against the actual production lot.