How does the purity of a tungsten crucible affect its performance in industrial applications?

High purity tungsten (≥99.95%): Minimizes contamination risks in semiconductor and optical material production and ensures crystal quality.
Medium purity tungsten (99.5%-99.9%): Suitable for general metallurgical applications where purity requirements are not high.
Doped tungsten variants: Adding lanthanum oxide (La₂O₃) enhances high temperature creep resistance and can extend crucible life by 30-50% under continuous use.