About Quanzhou Winitoor Industry Co., Ltd. - Construction Materials Supplier in China

China, specifically Quanzhou, hosts Quanzhou Winitoor Industry Co., Ltd., which currently lists seven active products. The catalogue includes a copper door and six silica‑fume related items that fall under the construction‑materials segment. Two of the silica‑fume products carry HS code 2811.22 (Amorphous Silicon Dioxide microsilica) and 2515.12 (Amorphous Silicon Dioxide 80‑96%). Three entries use HS code 2505.90 for silica fume/microsilica with SiO2 purity ranging from 85 % to 98 %. The remaining item, labelled simply “Microsilica (Silica Fume)”, is listed without an HS code but belongs to the same amorphous SiO2 family.

The copper door is the sole non‑silica product and is classified under metal doors rather than the concrete‑additive line. All silica‑fume items are described as amorphous silicon dioxide, with varying purity specifications that are typical for concrete and refractory applications. The product set therefore spans concrete admixture materials and a metal‑fabricated door, reflecting a modest but focused portfolio for construction‑related buyers.

Product Range and Specialties of Quanzhou Winitoor Industry Co., Ltd.

The silica‑fume portfolio comprises five distinct grades: a concrete‑grade fume (HS 2811.22), a high‑purity 80‑96 % SiO2 variant (HS 2515.12), a generic microsilica (HS 3824.40), and two products listed under HS 2505.90 with purity windows of 85‑96 % and 92‑98 %. In the industry, these grades are commonly measured against ASTM C1240 or EN 197‑1, which specify SiO2 content ≥ 80 %, loss on ignition ≤ 5 %, bulk density around 0.3 t/m³, and specific surface area 15‑30 m²/g. Buyers often request particle‑size distribution (median ~ 0.2 µm) and moisture content < 1 % for ready‑mix concrete use. The copper door is a fabricated metal component typically supplied in standard panel dimensions (e.g., 900 mm × 1800 mm) and may conform to ASTM B209 for copper sheet thickness or EN 16516 for door hardware.

Trade and Export Information - Quanzhou Winitoor Industry Co., Ltd.

China is among the world’s largest exporters of silica fume, supplying the United States, European Union, Middle East and Southeast Asian markets. HS chapter 25 (mineral products) and chapter 28 (chemicals) are the primary tariff lines, with 2505.90 and 2811.22 frequently subject to anti‑dumping duties in the EU. Buyers usually require compliance with ISO 9001 quality‑management systems, CE marking for European distribution, and test reports aligned with ASTM C1240 or EN 197‑1. Packaging is standardised to 25 kg bulk bags for bulk shipments and 20‑ft or 40‑ft containers for larger orders; FOB Quanzhou and CIF major ports are the common Incoterms. For metal doors, the copper component is classified under HS 7610 (other doors, windows and their frames). International buyers often look for compliance with ASTM B209 or EN 16516, and for corrosion‑resistance certifications such as ASTM B117 (salt‑spray test). Export documentation typically includes a Certificate of Origin, material safety data sheet (MSDS), and, where required, a CE‑type conformity declaration for the EU market.

Sourcing from Quanzhou Winitoor Industry Co., Ltd. - Buyer Guidance

When evaluating the silica‑fume items, request the latest analytical certificate showing SiO2 percentage, loss on ignition, bulk density and specific surface area. A third‑party test report referencing ASTM C1240 or EN 197‑1 helps verify that the grade matches the intended concrete application, whether for ready‑mix, precast or refractory use. Verify that the HS code used on the commercial invoice matches the product description to avoid customs discrepancies. For the copper door, ask for a product data sheet that lists panel dimensions, thickness, alloy composition (e.g., Cu‑Zn % if brass) and any applicable mechanical test results. Confirm that the supplier can provide an MSDS and, if you are shipping to Europe, a CE‑type declaration or equivalent conformity evidence. Samples of both silica fume (e.g., 5 kg bag) and a door panel are standard practice before placing a full order.

What SiO2 purity levels are available for the silica‑fume products?

The catalogue lists silica‑fume grades with SiO2 purity ranges of 80‑96 % (HS 2515.12), 85‑96 % (HS 2505.90) and 92‑98 % (HS 2505.90). The concrete‑grade fume (HS 2811.22) is described as amorphous silicon dioxide without a specific range but is typically ≥ 80 % in the industry.

Which certifications should I request for the silica‑fume shipments?

Buyers normally request an ISO 9001 quality‑management certificate, a material analysis report conforming to ASTM C1240 or EN 197‑1, and a Certificate of Origin. For EU imports, a CE‑type conformity statement is often required.

What are the common packaging sizes for the silica‑fume products?

Silica fume is commonly packed in 25 kg bulk bags for bulk handling, and these bags are loaded into 20‑ft or 40‑ft containers for ocean freight. Some suppliers also offer 1‑ton jumbo bags for very large orders.

What is the typical minimum order quantity (MOQ) for the silica‑fume grades?

In the Chinese export market, MOQs range from one 25 kg bag for trial shipments to full container loads (approximately 800 kg per 20‑ft container). The exact MOQ depends on the specific grade and the buyer’s logistics preferences.

What lead time should I expect for the copper door?

Lead times for fabricated metal doors in China generally range from 15 to 30 days after order confirmation, depending on panel size and any custom finish requirements. Shipping time adds another 20‑35 days under FOB or CIF terms to major ports.

Which documents are essential before import customs clearance?

Essential documents include the commercial invoice, packing list, Bill of Lading, Certificate of Origin, material test report (for silica fume), and any required CE or ASTM conformity certificates. An MSDS is also needed for hazardous‑material handling, though silica fume is classified as non‑hazardous.

How can I request a sample of the silica‑fume products?

Contact the supplier to arrange a 5 kg sample shipped under FOB terms. Request the accompanying test report and certificate of analysis with the sample to compare against your project specifications.