| Country of Origin | United States |
|---|---|
| Color | Off White |
| Brand | AMPS Advanced Ceramics |
Check the listing for details. 4.975" DIAMETER CONTROLLED POROSITY ALUMINA CERAMIC RING WASHER No.: 516. Color: Off White, Condition: New, Made in United States. Listed at 24.00 USD. They are made from 99.7% purity Aluminum Oxide (Al. 2 ) which is Silica. This material has very high stiffness, very good corrosion resistance to chemicals at high temperature, and very high refractoriness or use temperature.