Audited Supplier
Alumina ceramic (Aluminum Oxide, or Al2O3) is one of the most widely used technical ceramic materials, with an excellent combination of mechanical and electrical properties as well as a favorable cost-to-performance ratio. Wintrustek offers a range of Alumina compositions to meet your most demanding applications.
| Typical Grades | 95%, 96%, 99%, 99.5%, 99.6%, 99.7%, and 99.8% |
| Typical Properties | Outstanding electrical insulation High mechanical strength and hardness Excellent abrasion and wear resistance Excellent corrosion resistance High dielectric strength and Low dielectric constant Good thermal stability |
| Typical Applications | Electronic components and substrates High temperature electrical insulators High voltage insulators Mechanical seals Wear components Semiconductor components Aerospace components Ballistic armor |
Alumina components can be formed by a variety of manufacturing techniques such as dry pressing, isostatic pressing, injection molding, extrusion, and tape casting. Finishing can be accomplished by precision grinding and lapping, laser machining, and a variety of other processes.
The alumina ceramic components produced by Wintrustek are suitable for metallization in order to create a component that is easily brazed with many materials in subsequent operations. 
Properties / Material Grades | 95% Alumina | 99% Alumina | 99.8% Alumina |
Color | White | Ivory | Ivory |
Density (g/cm3) | 3.60 | 3.90 | 3.93 |
Compressive Strength (MPa) | 2300 | 2500 | 2500 |
Flexural Strength (MPa) | 300 | 375 | 380 |
Vicker's Hardness(Kg/mm2) | 1200 | 1400 | 1800 |
Modulus Of Elasticity(GPa) | 320 | 350 | 390 |
| Fracture Toughness (MPa·m1/2) | 3.5-4 | 4-5 | 4-5 |
Thermal Conductivity (W/m·K) | 20 | 27 | 32 |
Thermal Expansion Coefficient (10-6/K) | 7 | 8.2 | 8.2 |
| Max.Working Temperature (ºC) | 1600 | 1700 | 1700 |
Dielectric Strength(KV/mm) | >15 | >15 | >15 |
| Dielectric Constant (εr) | 9 | 9.6 | 10 |
| Volume Resistivity(Ω.cm) | >1014 | >1015 | >1015 |
1. Many grades of ceramic materials to choose from for your applications.
2. Technical support on consultation, design, and prototypes.
3. Fast delivery from prototype to production quantities.
4. In-house capabilities in forming, sintering, machining, glazing, metalizing, brazing, and assembly.
5. Our highly trained team of quality assurance staff uses advanced measuring devices to ensure that our products always meet the customers' requirements.
"It has been over 6 years since your company became our trusted supplier. During all years' requisitions, we were happy with your good quality products and reliable service. Appreciated your previous service with all efforts: patience, reliability, and responsible quality." --- by CoorsTek, Nov. 2023
Q: What is your minimum order quantity (MOQ)?
A: Our minimum order quantity (MOQ) depends on many factors such as product, material, dimensions, etc.
Q: Do you provide free samples?
A: Yes, we are pleased to provide a free sample for your initial evaluation of our materials if we have the sample in stock and if its cost is bearable to us.
Q: Do you accept a trial order before a bulk purchase?
A: Yes, we welcome your trial order to verify our quality before your bulk purchase.
Q: What is your production time?
A: Our production time depends on materials, production methods, tolerances, quantity, etc. Normally, it takes 15-20 days if we have stock material, and it takes 30-40 days if we don't. Please share your specific requirements with us, and we will quote the fastest production time.
Q: What are your payment terms?
A: Our payment terms are T/T, L/C, and PayPal.
Q: What packaging do you use to ensure ceramics are safe?
A: We pack the ceramic products tidily with foam protection inside the carton, plastic box, and wooden box.
Q: Do you accept custom orders?
A: Of course, most of our orders are custom products.
Q: Would you provide an inspection report and material test certificate for our order?
A: Yes, we can provide these documents upon request.
