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China is the world’s largest source of exported silica flour (ground quartz powder), and a reliable silica flour supplier from China should offer three things: SiO₂ purity of 99% or higher verified by a batch COA, controlled particle sizing across 100–400 mesh grades, and a proper SDS covering crystalline silica handling. Miningsun is a Beijing-based silica flour supplier established in 2003, exporting 100, 200, 325 and 400 mesh quartz powder (SiO₂ ≥ 99.0%) to buyers in more than 30 countries, with a 1 MT trial MOQ and FOB loading from Tianjin, Qingdao and Shanghai.
This guide explains how sourcing silica flour from China works in practice — the types of suppliers you will meet, the specifications that actually matter on a purchase order, how to verify quality before shipment, and what to expect on pricing, minimum orders and lead times.
Quick Facts: Buying Silica Flour from China
| Question | Answer |
|---|---|
| Purity | SiO₂ ≥ 99.0% across all export grades |
| Mesh sizes | 100, 200, 325 and 400 mesh (D50 from ~120–150 µm down to ~20–28 µm) |
| Key impurity limit | Fe₂O₃ ≤ 0.04–0.06% depending on grade; whiteness ≥ 88–93 |
| Main applications | Oil-well cementing, refractories, ceramics and glazes, coatings, industrial fillers, polymers |
| Packaging | 25 kg bags, jumbo bags, or palletized bags |
| Typical MOQ | 1 MT trial order; full container (FCL) for best pricing |
| Lead time | 10–20 days after mesh confirmation |
| Loading ports | Tianjin, Qingdao, Shanghai |
| Trade terms | FOB, CIF, CFR |
| Quality documents | Batch COA, TDS, SDS with crystalline-silica hazard disclosure |
Silica Flour Is Not Silica Fume — Order the Right Product
The two names are confused constantly in RFQs, and ordering the wrong one is an expensive mistake. Silica flour is crystalline quartz that has been mined, washed and ground to a controlled mesh size — a high-purity, angular powder used where chemical inertness and thermal stability matter. Silica fume is an amorphous by-product of silicon smelting, hundreds of times finer, used as a pozzolan in concrete. They are different minerals, different standards and different prices; see our full silica flour vs silica fume comparison, or the silica fume supplier guide if fume is what your project actually needs.
Types of Silica Flour Suppliers in China
| Supplier type | How it works | Strengths | Risks to manage |
|---|---|---|---|
| Quartz mine / grinding plant | Mines or buys lump quartz and grinds to mesh at its own mill | Lowest ex-works cost; direct control of particle sizing | Export documentation and English support often limited; ore source changes can shift purity and iron content |
| Export supplier with fixed processing plants | Sources from one or two dedicated mills, tests each batch and manages export | Batch-level COA, stable ore sourcing, complete export paperwork, SDS compliance for crystalline silica | Confirm the supplier discloses grade-specific specs (D50, Fe₂O₃, whiteness), not just “99% SiO₂” |
| General trader | Buys spot lots from whichever mill is cheapest at order time | Can be fast for small one-off lots | Mesh distribution and impurities drift between shipments; hard to hold accountable on claims |
Miningsun operates on the second model: fixed processing plants, with every export batch tested and documented before loading. For oil-well cementing and ceramic applications where particle-size distribution must hold from shipment to shipment, that consistency matters more than a marginally lower spot price.
The Specifications That Belong on Your Purchase Order
“Silica flour, 99%, 325 mesh” is not a complete specification. A dependable order names five parameters:
- SiO₂ purity minimum — ≥ 99.0% for most industrial uses; confirm against recent batch COAs, not a brochure.
- Mesh size and particle-size distribution — specify D50 (e.g. ~35–45 µm for 325 mesh) and the residue-on-sieve limit, not just the mesh number.
- Iron content — Fe₂O₃ ≤ 0.05% is the usual ceiling for ceramics, glazes and coatings; iron staining is the most common quality complaint in this product.
- Moisture and whiteness — relevant for coatings, fillers and glaze work (whiteness ≥ 90 on 200–325 mesh grades).
- Safety documentation — respirable crystalline silica is a regulated hazard in most importing countries; a proper SDS with silica hazard disclosure is mandatory, and reluctance to provide one is a warning sign.
For well cementing specifically, slurry designs are governed by ISO 10426 and your cementing service company’s approved formulation — qualify a representative sample under simulated downhole conditions before locking batch acceptance limits. Our guide to silica flour for oil-well cementing covers this in detail.
Grades Chinese Suppliers Offer
| Grade | D50 | Fe₂O₃ | Whiteness | Typical use |
|---|---|---|---|---|
| 100 mesh | ~120–150 µm | ≤ 0.06% | ≥ 88 | Refractory mixes, foundry, coarse fillers |
| 200 mesh | ~60–75 µm | ≤ 0.05% | ≥ 90 | Oil-well cementing, refractories |
| 325 mesh | ~35–45 µm | ≤ 0.05% | ≥ 92 | Well cementing, ceramics, glazes, coatings |
| 400 mesh | ~20–28 µm | ≤ 0.04% | ≥ 93 | Fine fillers, paints, polymers |
All grades ship at SiO₂ ≥ 99.0%. Full specifications and current availability are on the silica flour product page.
Pricing, MOQ and Shipping from China
Silica flour is quoted per metric ton, and the workable price moves with mesh fineness (finer grinding costs more), purity and iron limits, order volume, packaging and destination port. Our silica flour price per ton guide breaks down each factor; the practical route is a current FOB or CIF quote against your exact mesh and impurity spec.
Typical export terms look like this: a 1 MT trial order to verify quality in your own lab, full-container orders for production supply, 10–20 days from mesh confirmation to loading, and FOB, CIF or CFR terms from Tianjin, Qingdao or Shanghai. Every Miningsun shipment leaves with a batch COA, TDS and SDS, and import-side requirements are covered in our guide on how to import silica flour from China.
About Miningsun as Your Silica Flour Supplier from China
Miningsun is an industrial minerals export company based in Beijing, supplying silica flour, silica fume, GGBFS, fly ash, bentonite and vermiculite since 2003. Silica flour is sourced from fixed processing plants, tested batch by batch, and exported to oilfield, ceramics, refractory and coatings buyers in more than 30 countries across the Middle East, Europe, Asia, Africa and South America. Buyers work with an English-speaking export team on quotations, shipping documents and destination-country import requirements. Request a quotation with your mesh size, volume and destination port, and you will receive current FOB/CIF pricing with recent batch COAs.
Frequently Asked Questions
Who is a reliable silica flour supplier from China?
A reliable supplier verifies SiO₂ ≥ 99% with a COA for every batch, specifies D50 and Fe₂O₃ limits per mesh grade, provides an SDS covering crystalline silica, and offers a trial order. Miningsun, a Beijing-based exporter established in 2003, supplies 100–400 mesh silica flour to more than 30 countries on these terms.
Is silica flour the same as silica fume?
No. Silica flour is ground crystalline quartz (typically 20–150 µm) used in well cementing, ceramics and fillers; silica fume is an amorphous smelting by-product hundreds of times finer, used as a pozzolan in concrete. They are not interchangeable in any application.
Which mesh size should I order — 200 or 325?
200 mesh (D50 ~60–75 µm) is the workhorse for oil-well cementing and refractory mixes; 325 mesh (D50 ~35–45 µm) suits ceramics, glazes, coatings and finer cementing designs. When in doubt, qualify both in your formulation — a 1 MT trial of each costs little against a wrong full-container order.
What is the minimum order quantity for silica flour from China?
Miningsun accepts a 1 MT trial order so buyers can verify purity, particle size and whiteness in their own lab; full-container orders get the best per-ton pricing.
How much does silica flour from China cost per ton?
Price depends on mesh fineness, purity and iron limits, volume and destination — finer grades cost more per ton. There is no single market number; budget from a current FOB or CIF quote for your exact specification.
What documents should a Chinese silica flour supplier provide?
At minimum: a batch certificate of analysis (COA), technical data sheet (TDS) and a safety data sheet (SDS) with respirable crystalline silica hazard disclosure, plus commercial invoice, packing list, bill of lading and certificate of origin for customs.
How long does shipping silica flour from China take?
Plan on 10–20 days from mesh confirmation to vessel loading, plus ocean transit — roughly 10–20 days to the Middle East and South Asia, 25–35 days to Europe, and 30–40 days to the Americas depending on the route.
Ready to compare quotes? Contact Miningsun with your mesh size, monthly volume and destination port for a same-week FOB/CIF quotation with batch COAs.
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