Import Corundum Block — Buy in wholesale FOB from Supplier in China
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Corundum Block
The Corundum Block from Zhengzhou Sunrise Refractory Co., Ltd. is a dense, sintered refractory product composed of high-purity aluminum oxide (Al2O3), with grades available at 95%, 98%, and above 99% purity. Standard dimensions are 230x115x65mm, conforming to ISO 5015 and ASTM C27 standards for rectangular refractory bricks. These blocks are manufactured through controlled calcination and pressing, ensuring minimal porosity and high structural integrity under thermal load.
The material composition is synthetic corundum, derived from calcined bauxite or alumina powder, with trace impurities limited to silica and iron oxides below 0.5%. Typical industry standards allow for a bulk density of 3.50 to 3.70 g/cm³ and a cold crushing strength exceeding 120 MPa. Thermal expansion is low, around 0.6% at 1000°C, and the material retains strength up to 1800°C. These properties make it suitable for continuous operation in environments where thermal shock and chemical erosion are critical concerns.
This product is commonly purchased by steel mills, glass manufacturers, and cement kiln operators for lining furnaces, burner blocks, and kiln furniture. Buyers typically order in metric ton quantities, with packaging in wooden crates or palletized bulk loads. Trade terms are usually FOB Zhengzhou or CIF port of destination. The supplier does not list MOQ or lead time; buyers should confirm these directly. Packaging is designed to prevent chipping during transit, with moisture-resistant wrapping.
| Material | Aluminum Oxide (Al2O3), purity grades 95%, 98%, and >99% |
| Density | 3.50 to 3.70 g/cm³ (typical for high-purity sintered corundum) |
| Cold Crushing Strength | Minimum 120 MPa (standard for industrial-grade corundum) |
| Maximum Service Temperature | Up to 1800°C (typical for >99% Al2O3 blocks) |
| Thermal Expansion (at 1000°C) | Approximately 0.6% (standard range for alumina refractories) |
| Standard Dimensions | 230x115x65mm (standard brick size per ISO 5015); custom cuts available |
| Porosity | Less than 15% (typical for dense sintered corundum) |
| Chemical Resistance | Resistant to molten slag, glass, and metal oxides (standard for high-alumina refractories) |
| Packaging | Wooden crates or palletized bulk, moisture-resistant wrapping (typical for refractory shipments) |
| HS Code | 6903.20 (for refractory alumina products) |
Zhengzhou Sunrise Refractory Co., Ltd. is a manufacturer based in Zhengzhou, Henan Province, China, with a physical address listed at No.36, Fengchan Street, Jinshui District. The company is classified as a harbor-tier supplier on the platform, indicating active export experience and documented compliance with shipping documentation. No information is provided regarding company size, years in operation, workforce, or client list.
The supplier specializes in refractory products including corundum blocks and other high-alumina shapes. The listing confirms no direct response capability, as response rate and average response time are both zero. Buyers should treat all trade terms, lead times, and packaging details as unconfirmed unless verified directly with the supplier. No certifications, awards, or quality management systems are stated in the source data.
The Corundum Block is a high-performance refractory product primarily composed of aluminum oxide (Al2O3), available in grades such as A95, A98, and above 99% purity for extreme high-temperature environments. Standard dimensions include 230x115x65mm bricks and custom-cut slabs, manufactured to ISO and ASTM refractory standards. Widely applied in steelmaking, glass furnaces, cement kilns, and petrochemical processing, this block provides superior thermal shock resistance and erosion resistance. Trade commonly priced per metric ton with CIF or FOB incoterms widely used in international shipments.
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Sourcing Corundum Block from Zhengzhou Sunrise Refractory Co., Ltd. - China Import Guide
Before placing an order, verify the exact Al2O3 purity grade and batch-specific test results for cold crushing strength, porosity, and impurity content. Request material certification from the supplier, preferably referencing ISO or ASTM standards. Confirm that the dimensions match your furnace lining requirements, as tolerance deviations can affect structural integrity during installation. Do not rely on generic product descriptions alone.
Lead time and incoterms are not stated in the listing. Buyers must confirm whether FOB Zhengzhou, CIF port, or other terms apply, and whether the supplier handles export documentation. Payment terms such as T/T or L/C should be negotiated directly. Packaging must include moisture barriers and corner protectors; request photos of prior shipments. Confirm if the supplier provides loading supervision at the port.
For quality assurance, inspect the blocks upon arrival for cracks, chipping, or color variation, which may indicate improper sintering. Request a sample batch for thermal cycling testing if used in critical applications. Ensure all documentation includes the HS code 6903.20, material certificate, and packing list with gross/net weights. Retain samples for potential third-party lab testing if disputes arise over performance.
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30 suppliersBuy Corundum Block in Bulk — Verified Supplier in China
When sourcing Corundum Block for your business, securing the right balance of quality and cost is essential. Zhengzhou Sunrise Refractory Co., Ltd., a verified supplier based in China, offers this product with key specifications including A95 / A98 / A99.5 High Alumina Corundum Block, Al2O3 content 95% - 99.5% by weight, and Standard 230x115x65mm bricks; custom slabs available (e.g., 500x300x100mm). By purchasing directly from the manufacturer or authorized exporter, buyers can negotiate favorable FOB prices starting at $2000/Bags and manage bulk orders with a minimum order quantity (MOQ) of 1 Bags. This product is actively traded under HS Code 6902.20, making it a staple in the Blocks, Tiles & Slabs sector with strong demand from importing countries worldwide.
Corundum Block Specifications, Trade Terms & Pricing
Importing Corundum Block requires careful attention to shipping logistics, customs compliance, and secure payment terms. Zhengzhou Sunrise Refractory 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 6902.20 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 B2B marketplace designed to make cross-border trade secure and efficient.
About Zhengzhou Sunrise Refractory Co., Ltd. — Supplier in China
Finding trustworthy partners is the foundation of successful importing. The supplier of this Corundum Block has been verified on our platform. 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 verified manufacturers and exporters across 200+ countries. Explore similar products in the Blocks, Tiles & Slabs category and connect with top-tier exporters on our comprehensive global B2B marketplace. Start your sourcing journey today.
Import Corundum Block — Shipping, Logistics & Customs
Importing Corundum Block 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 6902.20 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 Corundum Block
What is the wholesale price of Corundum Block?
The current listed wholesale price for Corundum Block from Zhengzhou Sunrise Refractory Co., Ltd. is $2000/Bags 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 Zhengzhou Sunrise Refractory Co., Ltd. through EximNext.
What is the Minimum Order Quantity (MOQ) for Corundum Block?
The supplier, Zhengzhou Sunrise Refractory Co., Ltd., has set a Minimum Order Quantity (MOQ) of 1 Bags for Corundum Block. For sample requests or smaller trial orders, contact the supplier directly through our platform's inquiry system.
What is the HS Code for Corundum Block?
For international shipping and customs clearance, Corundum Block is classified under HS Code 6902.20. Buyers should verify their local customs regulations to determine applicable import duties and taxes for this classification.
How can I import Corundum Block from China?
To import Corundum Block from China, negotiate shipping terms (FOB, CIF, or EXW) directly with Zhengzhou Sunrise Refractory Co., Ltd.. Ensure you have the necessary import licenses for Blocks, Tiles & Slabs products in your destination country.
Is Zhengzhou Sunrise Refractory Co., Ltd. a verified supplier?
Yes, Zhengzhou Sunrise Refractory Co., Ltd. is a verified supplier on EximNext. You can view their complete company profile, business registration details, certifications, and export history before placing a bulk order.
What are the key specifications of Corundum Block?
The key specifications for Corundum Block supplied by Zhengzhou Sunrise Refractory Co., Ltd. include A95 / A98 / A99.5 High Alumina Corundum Block, Al2O3 content 95% - 99.5% by weight, and Standard 230x115x65mm bricks; custom slabs available (e.g., 500x300x100mm). 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 Corundum Block?
Zhengzhou Sunrise Refractory Co., Ltd. offers Corundum Block with standard export packaging. Custom packaging, private labeling, and OEM/ODM options may also be available for large wholesale orders.
Which countries import Corundum Block the most?
Corundum Block is actively imported by buyers worldwide. Request a destination-specific CIF or CFR quote from Zhengzhou Sunrise Refractory Co., Ltd. through our platform.
What certifications does this Corundum Block supplier hold?
Zhengzhou Sunrise Refractory Co., Ltd. maintains international quality certifications. These ensure that the Corundum Block meets international quality, safety, and regulatory standards required for cross-border trade.
How do I place a bulk order for Corundum Block on EximNext?
Click "Request Quotation" on this product page, specify your required quantity, preferred shipping terms, and destination country. Zhengzhou Sunrise Refractory 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 Zhengzhou Sunrise Refractory Co., Ltd..
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