Our factory
We research, design, produce and sell high-alumina, corundum and other industrial ceramic products for high-temperature, electrical-insulation, wear, corrosion, laboratory and industrial-equipment uses. We export as GY Alumina, under our registered trademark 鑫国玉®, Xin Guo Yu.
Where we are
Tangshan, in Hebei province in northern China, is a city with a long history of ceramics making. Our factory is in Xiaoji Town, Fengnan District.
We make industrial ceramics, not tableware: tubes, insulators, crucibles and engineered parts for heat, electrical insulation, wear and corrosion.
We supplied thermocouple protection tubes for the expansion of China’s solar industry.
Figures from our 2024–2026 sales records.
Capabilities
How we make it
Milling, forming, firing, finishing and packing all happen in our own factory. Send your drawing and we confirm the route, grade and tolerances at quotation.
We start from calcined alumina powder.
The powder is milled in large drum ball mills.
Tubes and rods are formed on horizontal vacuum extruders and a vertical hydraulic ram extruder; slip casting uses plaster moulds.
Formed pieces dry on multi-tier rack carts and grooved boards before firing.
Tubes hang vertically in the kiln, and our written gas-kiln procedure controls firing with thermocouples and an optical pyrometer.
Tubes are cut to the ordered length, then slotted or drilled where the drawing calls for it.
Outside and inside diameters are measured with vernier calipers.
Tubes are bubble-wrapped or bundled and packed in foam-lined plywood crates.
Continuity
Every product, material and capability we list is in production today. The factory has been running for 42 years, and we have made this product line for at least 15 years. Buyers who qualify a part with us keep ordering it: 33 of our customers have taken 10 or more shipments since 2024.
Quality first, credibility and good faith, practical innovation.
Certified and tested
Quality management
GB/T19001-2016 · certified by CFL Certification Center
A copy of the certificate is available on request.
Independent lab test
Alumina tube sample, tested by Chinalco Testing Technology (Zhengzhou) Co., Ltd., 13 May 2026. Report 26-04928.
| Item | % | Method |
|---|---|---|
| Al₂O₃ | 99.61 | GB/T 24487-2022 |
| SiO₂ | 0.15 | GB/T 6609.3-2004 |
| Fe₂O₃ | 0.014 | GB/T 6609.4-2004 |
| Na₂O | 0.054 | GB/T 6609.1-2018 |
| CaO | 0.13 | GB/T 6609.1-2018 |
| Loss on ignition | 0.033 | GB/T 6609.2-2022 |
Result for the submitted sample. Each quotation comes with test data for the grade you order.
Photographs
Request a quote
Tell us the dimensions, grade and quantity. A contractual datasheet with current, product-specific test data and tolerances comes with each quotation.