Silica Flour Supplier China | SiO₂ ≥99% Quartz Powder 100–400 Mesh
High-purity ground quartz supplied from verified Chinese processing sources. SiO₂ ≥ 99%. Available in 100 / 200 / 325 / 400 mesh. FOB / CIF from major Chinese ports.
Supplied to oilfield cementing contractors, refractory manufacturers, ceramic and glass producers, foundries, and paint & coating formulators across North America, Europe, the Middle East, Southeast Asia, and Africa. Every shipment third-party tested — COA and MTC included as standard.
Select Your Mesh Size
Silica flour is graded by fineness (mesh number). Coarser mesh for oil well cementing and refractory mixes; finer mesh for ceramics, coatings, and precision applications. Custom mesh ranges and D₅₀ particle size targets available on request.
Refractory & Foundry
Coarsest flour grade. Ideal as a filler in refractory castables and foundry mold coatings where coarser particle packing is desired.
- Refractory castables
- Foundry sand systems
- Grout & mortar filler
Oil Well Cementing
The primary grade for oil well cementing. Prevents strength retrogression at BHST > 110 °C when blended 35–40% BWOC with Class G / H cement.
- Oil & gas well cementing
- Geothermal well cementing
- Lightweight concrete filler
Ceramics & Coatings
Fine grade for ceramic glaze formulation, industrial coatings, and HPHT cementing requiring a finer slurry with improved packing efficiency.
- Ceramic glaze & body
- Paints & industrial coatings
- HPHT well cementing
Glass & Precision
Finest standard grade for glass manufacturing, fiberglass, precision casting, and high-performance rubber & plastic reinforcement.
- Glass & fiberglass production
- Rubber & plastic filler
- Epoxy flooring systems
SiO₂ ≥ 99% — High Purity Quartz Source
Ground from high-grade natural quartz ore. Standard grade ≥ 99.0% SiO₂; high-purity grade ≥ 99.5%. Low Fe₂O₃ (<0.05%) and Al₂O₃ content — essential for glass, ceramic, and electronics applications.
Prevents Cement Strength Retrogression
When blended 35–40% BWOC with API Class G or H cement, silica flour prevents the strength retrogression that occurs at bottom-hole static temperatures exceeding 110 °C — the critical additive for deep and HPHT well cementing.
Tight Particle Size Distribution
Controlled grinding and air classification ensure consistent D₅₀ and D₉₀ values batch to batch. Critical for slurry rheology in oilfield cementing and for glaze smoothness in ceramics.
Excellent Thermal & Chemical Stability
Melting point above 1,600 °C. Chemically inert — resistant to all acids except HF. Ideal for refractory applications, high-temperature kiln linings, and chemically demanding environments.
Flexible Mesh & Packaging
100 to 400 mesh standard; custom D₅₀ targets and ultra-fine micronized grades available on request. 25 kg bags, 1 MT / 1.5 MT jumbo bags (FIBC), or bulk vessel loading.
Full Export Documentation
COA, MTC, CO, MSDS, and third-party inspection (SGS / BV / CIQ) available. PSD report (laser diffraction) and XRF chemical analysis provided per shipment on request.
Specifications by Mesh Grade
Key chemical and physical parameters for our standard export grades. High-purity grades (SiO₂ ≥ 99.5%, Fe₂O₃ ≤ 0.02%) available for electronics, optical, and precision applications. Custom specs on request.
| Parameter | 100 Mesh | 200 Mesh | 325 Mesh | 400 Mesh |
|---|---|---|---|---|
| Median Particle Size (D₅₀) | ~120–150 µm | ~60–75 µm | ~35–45 µm | ~20–28 µm |
| SiO₂ Content (min) | ≥ 99.0% | ≥ 99.0% | ≥ 99.0% | ≥ 99.0% |
| Fe₂O₃ Content (max) | ≤ 0.06% | ≤ 0.05% | ≤ 0.05% | ≤ 0.04% |
| Al₂O₃ Content (max) | ≤ 0.20% | ≤ 0.18% | ≤ 0.15% | ≤ 0.12% |
| Moisture Content (max) | ≤ 0.5% | ≤ 0.5% | ≤ 0.3% | ≤ 0.3% |
| Whiteness (min) | ≥ 88 | ≥ 90 | ≥ 92 | ≥ 93 |
| pH (10% suspension) | 6.5 – 7.5 | |||
| Bulk Density (loose, kg/m³) | 900 – 1,100 | |||
| Specific Gravity | 2.65 g/cm³ | |||
| Crystal Form | α-Quartz (crystalline) | |||
* Typical values from production. Batch-specific COA with XRF chemical analysis and laser diffraction PSD report available on request. High-purity grade (SiO₂ ≥ 99.5%) available at premium — specify when enquiring.
Where Our Customers Use Silica Flour
From HPHT oil wells in the Gulf to fiberglass plants in Southeast Asia — silica flour's combination of purity, hardness, and chemical inertness makes it essential across multiple high-value industries.
Oil & Gas Well Cementing
35–40% BWOC addition to API Class G/H cement for BHST > 110 °C. Prevents strength retrogression and maintains low permeability in HPHT, SAGD, and geothermal wells.
Refractory Materials
Filler and binder in castable refractories, kiln linings, furnace floors, and high-temperature mortars. Provides thermal stability and volume stability at elevated temperatures.
Ceramics & Sanitaryware
Glaze formulation, clay body recipes, tiles, and sanitaryware. Controls thermal expansion, improves vitrification, and enhances surface hardness and whiteness.
Glass & Fiberglass
Raw material for container glass, flat glass, specialty glass, and fiberglass (E-glass). High SiO₂ purity and low Fe₂O₃ are critical for color-neutral glass and fiber strength.
Paints, Coatings & Sealants
Functional filler to improve abrasion resistance, surface hardness, viscosity control, and anti-sag properties in industrial and architectural coatings.
Foundry & Rubber / Plastics
Foundry mold coatings and core washes. Reinforcing filler in rubber compounds and plastic composites to enhance tensile strength, dimensional stability, and heat resistance.
Packaging, Ports & Payment
Flexible packaging and incoterms to match your application, discharge facilities, and project scale. Moisture-resistant inner PE liner standard for all bags.
Packaging Options
- 25 kg PP woven bags with PE inner liner, palletized & shrink-wrapped
- 50 kg bags available on request
- 1,000 kg / 1,500 kg jumbo bags (FIBC) with PE liner
- Bulk loading into vessel holds (500+ MT)
- 20' / 40' container stuffing 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)
- COA with XRF analysis & PSD report per shipment
- SGS / BV / CIQ third-party inspection on request
Consistent Purity. Controlled Fineness.
China's Anhui, Jiangsu, and Inner Mongolia provinces host some of the world's highest-grade natural quartz deposits. Miningsun sources from established grinding facilities with air classification and rigorous QC — delivering silica flour with consistent SiO₂ purity, tight PSD, and reliable whiteness batch after batch.
- High-grade quartz source — SiO₂ ≥ 99.0% standard; ≥ 99.5% high-purity grade available
- Tight PSD control — laser diffraction PSD report provided per shipment; D₅₀ tolerance ± 5 µm
- All mesh grades stocked — 100, 200, 325, 400 mesh; custom micronized grades on request
- Third-party tested — XRF chemical analysis + laser diffraction PSD with every COA
- Stable pricing — quarterly fixed-price contracts available for oilfield and industrial buyers
- Reliable lead times — 15–25 days from PO to vessel loading, consistently
- Full export documentation — CO, MTC, MSDS, SGS/BV inspection, fumigation as required
- Responsive sales team — quotes within 24 hours, English / Chinese supported
Frequently Asked Questions
What is the difference between silica flour and silica sand?
Why is silica flour added to oil well cement?
How do I select the right mesh size for my application?
Is crystalline silica subject to health and safety regulations?
What is the minimum order quantity (MOQ) for silica flour?
Technical & Compliance Documents
Available to qualified buyers upon request — please specify mesh size, purity grade, and estimated annual volume when reaching out.
What Buyers Usually Check Before Ordering Silica Flour
For repeat and first-time buyers, we can prepare the key quality and shipment evidence needed for internal approval before PO confirmation.
- Grade / standard: 100-400 mesh; API Spec 10A / high-purity quartz powder specification
- Documents: COA, TDS, MSDS and particle-size distribution report
- SiO2 purity, Fe2O3 level and whiteness requirement
- Mesh size or D50 / D97 particle-size distribution
- Oil well cementing, refractory, ceramic or coating application
- 25 kg bags or jumbo bags with moisture-protective packing
- FOB, CIF or CFR quote based on quantity and destination port
Silica Flour Market and Quartz Flour Sourcing
Buyers searching for silica flour, quartz flour or high-purity quartz powder usually compare purity, mesh size, particle-size distribution, packaging and export documentation before choosing a supplier. Miningsun supports 100-400 mesh silica flour for oil well cementing, refractory, ceramic, coating and industrial filler applications.
- Common search names: silica flour, quartz flour, ground quartz powder and SiO2 powder
- Key buying specs: SiO2 purity, Fe2O3 level, whiteness, mesh size and moisture
- Export support: COA, TDS, MSDS, particle-size report, packing photos and loading photos
- Commercial options: FOB China ports, CIF destination port and CFR shipment quotations
Request a Quote for Silica Flour
Tell us your required mesh size, purity grade (standard / high-purity), annual volume, destination port, and packaging preference — we'll respond with a competitive FOB/CIF price within 24 hours.
Request FOB/CIF Price & Documents Or email us directly: info@miningsun.com · WhatsApp: +1 814 515 0096Silica Flour 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
Request filesBuyer notes
On fileContinue comparing Silica Flour
How to source Silica Flour from China
Use these notes to compare supplier quotes quickly: grade, standard, packing, loading port and documents should be checked before confirming price.
Silica Flour applications
Silica Flour is supplied for oil well cementing, refractory, ceramics and industrial fillers. 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 SiO2 99% options with mesh control. Available grade range: 100 / 200 / 325 / 400 mesh quartz powder.
Packing, MOQ and loading
Typical export packing: 25 kg bags, jumbo bags or palletized bags. MOQ: 1 MT trial order; FCL recommended. Quotes are prepared from FOB Tianjin, Qingdao or Shanghai with estimated lead time of 10-20 days after mesh confirmation.
Documents and inspection
No public PDF in the current product folder; TDS/COA can be requested. No public PDF is attached yet for this product. Current COA, TDS, MSDS or inspection files can be requested by grade, quantity and destination port.