Engineering Ceramic Ltd is the largest manufacture/exporter of alumina 997 tube & insulator in China, we supply -Alumina 997 ceramic protection tube/insulator (ALSINT 997) use into high temperature industry to protect thermocouple using temperature is 1850C (3362 F). We have over 300 sizes, 23, 000 units for stock. Standard size only needs 10 days for shipment. We also supply Si sic, Recrystallized sic and Nitride bonded sic protection tube which using Kiln industry, Steel industry and Miner industry. We are especially in high temperature industry.