Large diameter (LD) fused quartz tubes are resized using a glassblowing lathe. LD tubes are custom made and available in a full range of sizes, up to 1000 mm outer diameter.
LD tubes may be doped on the outer surface with a thin layer of Al2O3. This layer enables the growth of a cristobalite layer when the tube is exposed to a temperature above 1150°C, providing improved stability (reduced sagging) and a longer lifespan of the process tube at elevated temperatures. The stabilization is achieved by growing an approx. 20 mm layer of cristobalite on the outer surface during the first exposure over 1150°C. This enables the usage of the tube at temperatures > 1300°C.
Cooler and Coils
Diffusion- and CVD-Tubes
Rotary Furnace Tubes