Description
TW69 Lid. Lid for an TW69 Tapered Wall Crucible.
View the full range of tapered wall crucibles.
Max working temperature of 1750°C.
Almath Crucibles offer a variety of alumina products, including Alumina Crucibles, alumina tubes and alumina plates. We are also able to produce alumina furnaceware. Our TW69 Lid has a maximum operating temperature of 1750°C, making them ideal for high temperature applications.
Our high purity alumina (Al2O3 content > 99%) ceramics are purpose built to perform across a wide range of high temperature applications. We use recrystallized alumina in the production of our crucibles as the material offers impressive thermal shock resistance, this is due to the larger grain size (up to 200mm is advantageous).
Our high purity alumina shows considerable resistance to chemical attack due to the lack of glassy phases that tend to determine corrosion resistance.
The electrical and dielectrical properties of the material generally improve with increased purity. Electrical resistance is greatest and dielectrical loss factor is lowest in materials of highest alumina content.
High purity Alumina produces a dense and essentially single-phase ceramic on sintering. Grain growth during sintering can be controlled by small additions of MgO up to 0.05%. Our product usually contains a small amount of closed porosity but this can be kept below 0.5% using modern firing techniques.
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