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Silica Fume
Silica fume supplied by Gansu Sanyuan Silicon Materials Co., Ltd. is an amorphous silicon dioxide powder produced as a by‑product of silicon and ferrosilicon smelting. The material consists of ultra‑fine particles that are generally below one micron in diameter and is offered in both densified and undensified forms. According to the supplier’s description, the product is collected downstream of the smelting filters and is packaged for bulk shipment. These characteristics make it a recognised pozzolanic additive for high‑performance concrete.
In the concrete industry, silica fume typically contains a SiO2 purity of 95 % or higher and a specific surface area exceeding 20 000 m² kg⁻¹, which contributes to accelerated strength development. Standard bulk density values range from 0.5 to 0.6 g cm⁻³, and moisture content is usually kept below 0.5 % to preserve reactivity. The product’s particle size distribution aligns with the requirements of supplementary cementitious material specifications such as ASTM C1240. While Gansu Sanyuan’s offering matches these industry norms, the supplier does not publish exact bulk density or moisture figures, which should be confirmed.
Typical end users include concrete producers, precast manufacturers and refractory plant operators seeking improved compressive strength and chemical resistance. The silica fume is shipped in bulk bags or 20‑ft containers, and buyers are advised to discuss packaging options and incoterms directly with the supplier. Because the listing does not disclose minimum order quantities or lead times, interested importers should request those details before finalising a contract. Payment terms and quality certifications can also be clarified during the quotation stage.
| Material | Amorphous Silicon Dioxide (SiO₂) |
| Typical SiO₂ Purity | ≥95 % (typical) |
| Particle Size | <1 µm (typical) |
| Form | Densified or undensified |
| Specific Surface Area | ≥20 000 m² kg⁻¹ (typical) |
| Bulk Density | 0.5 - 0.6 g cm⁻³ (typical) |
| Moisture Content | <0.5 % (typical) |
| Packaging | Bulk bags (25 kg) or 20‑ft containers |
| Standard Reference | ASTM C1240 (supplementary cementitious material) |
| Typical Use Rate | 5 - 10 % of cement mass (typical) |
Gansu Sanyuan Silicon Materials Co., Ltd. is located at No. 215 Jinchang South Road, Chengguan, Lanzhou, Gansu 730000, China. The supplier is listed in the harbor trust tier and currently shows a response rate of 0 % with no recorded average response time. These signals indicate that the company’s communication performance cannot be assessed from the platform data. The address places the operation near major silicon‑metal production zones in Gansu province.
The company offers silica fume derived from its own silicon and ferrosilicon smelting processes, positioning the material as a by‑product of its primary metallurgical operations. According to the listing, the product is available in bulk and is marketed to international buyers in the construction and refractory sectors. No information is provided on minimum order quantities, lead times or certified quality management systems, so buyers should request those specifics. Gansu Sanyuan emphasizes the competitive nature of its supply but does not disclose pricing.
Silica fume (microsilica) is a highly reactive pozzolanic material sourced as a byproduct from silicon and ferrosilicon smelting, consisting of ultra-fine amorphous SiO2 particles typically below 1 micron. Widely used as a high-performance concrete additive to improve compressive strength, durability, and chemical resistance, it is also applied in refractories, ceramics, and advanced composites. Available in densified or undensified form, this product is traded globally in bulk bags or containers, with major supply from China, Norway, and the United States, making it a competitive commodity in the international construction materials market.
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Sourcing Silica Fume from Gansu Sanyuan Silicon Materials Co., Ltd. - China Import Guide
Before placing an order with Gansu Sanyuan Silicon Materials, importers should verify the company’s legal registration and factory address through official Chinese business registries. Request a recent company profile and any available third‑party audit reports to confirm the production capability of silica fume. Cross‑check the supplier’s bank details and ensure that the payment method aligns with your risk‑management policy.
Discuss the preferred Incoterm, such as FOB Lanzhou or CIF Shanghai, and obtain an estimated lead time for bulk bag or container loading. Because the listing does not disclose lead‑time, ask the supplier to provide a production schedule and shipping timeline. Clarify payment terms, for example a 30 % advance letter of credit with the balance against original shipping documents, to protect both parties.
Arrange an independent third‑party inspection of the silica fume before shipment, focusing on particle size distribution, SiO₂ purity and moisture content. Request a Certificate of Analysis and, if required by your market, a Material Safety Data Sheet. Ensure that the inspection agency can perform sampling according to ASTM C1240 guidelines, so the delivered product meets the performance criteria of your concrete mix.
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30 suppliersBuy Silica Fume in Bulk — Supplier in China
When sourcing Silica Fume for your business, securing the right balance of quality and cost is essential. Gansu Sanyuan Silicon Materials Co., Ltd., a supplier based in China, offers this product with key specifications including Densified Silica Fume, Undensified Silica Fume, SiO2 85% - 98%, Al2O3 <2%, Fe2O3 <1%, CaO <1%, Loss on Ignition <4%, and Median Particle Size 0.1 - 0.5 microns, Specific Surface Area 15,000 - 30,000 m²/kg. By purchasing directly from the manufacturer or authorized exporter, buyers can negotiate favorable FOB prices starting at $600 – $1,200 / MT and manage bulk orders with a minimum order quantity (MOQ) of 1 Unit. This product is actively traded under HS Code 2811.22, making it a staple in the Mineral Powder sector with strong demand from importing countries worldwide.
Silica Fume Specifications, Trade Terms & Pricing
Importing Silica Fume requires careful attention to shipping logistics, customs compliance, and secure payment terms. Gansu Sanyuan Silicon Materials Co., Ltd. offers flexible shipping options such as Full Container Load (FCL) or Less than Container Load (LCL) via sea freight. To ensure a smooth transaction, buyers should verify import duties for HS Code 2811.22 in their destination country. Common payment methods for international B2B transactions include Letter of Credit (L/C), Telegraphic Transfer (T/T), and Documents against Payment (D/P). All transactions and RFQs are facilitated through EximNext, a leading import export marketplace designed to make cross-border trade secure and efficient.
About Gansu Sanyuan Silicon Materials Co., Ltd. — Supplier in China
Finding trustworthy partners is the foundation of successful importing. Ask the supplier of this Silica Fume for business registration and quality documents before ordering. Whether you are a distributor, wholesaler, or procurement manager, you can request a free quotation, ask for product samples, and finalize your bulk purchase with confidence. EximNext hosts thousands of manufacturers and exporters across 200+ countries. Explore similar products in the Mineral Powder category and connect with top-tier exporters on our comprehensive online B2B marketplace. Start your sourcing journey today.
Import Silica Fume — Shipping, Logistics & Customs
Importing Silica Fume requires careful attention to shipping logistics, customs compliance, and secure payment terms. Common shipping options include Full Container Load (FCL) or Less than Container Load (LCL) via sea freight. Buyers should verify import duties for HS Code 2811.22 in their destination country. Common payment methods include Letter of Credit (L/C), Telegraphic Transfer (T/T), and Documents against Payment (D/P).
Frequently Asked Questions About Silica Fume
What is the wholesale price of Silica Fume?
The current listed wholesale price for Silica Fume from Gansu Sanyuan Silicon Materials Co., Ltd. is $600 – $1,200 / MT on FOB terms from China. Prices may vary depending on order volume, packaging, and destination. For the most accurate bulk quote, send a direct RFQ to Gansu Sanyuan Silicon Materials Co., Ltd. through EximNext.
What is the Minimum Order Quantity (MOQ) for Silica Fume?
The supplier, Gansu Sanyuan Silicon Materials Co., Ltd., has set a Minimum Order Quantity (MOQ) of 1 Unit for Silica Fume. For sample requests or smaller trial orders, contact the supplier directly through our platform's inquiry system.
What is the HS Code for Silica Fume?
For international shipping and customs clearance, Silica Fume is classified under HS Code 2811.22. Buyers should verify their local customs regulations to determine applicable import duties and taxes for this classification.
How can I import Silica Fume from China?
To import Silica Fume from China, negotiate shipping terms (FOB, CIF, or EXW) directly with Gansu Sanyuan Silicon Materials Co., Ltd.. Ensure you have the necessary import licenses for Mineral Powder products in your destination country.
How can I check Gansu Sanyuan Silicon Materials Co., Ltd. before ordering?
Open the Gansu Sanyuan Silicon Materials Co., Ltd. company profile on EximNext to see the details the company has provided. Before a bulk order, ask for business registration, certificates and export documents, and consider a sample or a small trial order.
What are the key specifications of Silica Fume?
The key specifications for Silica Fume supplied by Gansu Sanyuan Silicon Materials Co., Ltd. include Densified Silica Fume, Undensified Silica Fume, SiO2 85% - 98%, Al2O3 <2%, Fe2O3 <1%, CaO <1%, Loss on Ignition <4%, and Median Particle Size 0.1 - 0.5 microns, Specific Surface Area 15,000 - 30,000 m²/kg. For a complete technical data sheet or Certificate of Analysis (COA), send an inquiry directly to the supplier through EximNext.
What packaging options are available for bulk orders of Silica Fume?
Gansu Sanyuan Silicon Materials Co., Ltd. offers Silica Fume with standard export packaging. Custom packaging, private labeling, and OEM/ODM options may also be available for large wholesale orders.
Which countries import Silica Fume the most?
Silica Fume is actively imported by buyers worldwide. Request a destination-specific CIF or CFR quote from Gansu Sanyuan Silicon Materials Co., Ltd. through our platform.
What certifications does this Silica Fume supplier hold?
Gansu Sanyuan Silicon Materials Co., Ltd. maintains international quality certifications. These ensure that the Silica Fume meets international quality, safety, and regulatory standards required for cross-border trade.
How do I place a bulk order for Silica Fume on EximNext?
Click "Request Quotation" on this product page, specify your required quantity, preferred shipping terms, and destination country. Gansu Sanyuan Silicon Materials Co., Ltd. will respond with a detailed wholesale quote including FOB pricing, lead time, and payment options.
What payment methods are accepted?
Common payment methods include Letter of Credit (L/C), Telegraphic Transfer (T/T), Documents against Payment (D/P), and Escrow services. Confirm accepted terms directly with Gansu Sanyuan Silicon Materials Co., Ltd..
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