How stable is ammonium metatungstate hydrate under high-temperature industrial conditions?

How stable is ammonium metatungstate hydrate under high-temperature industrial conditions?
AMT hydrate demonstrates excellent thermal stability, a key reason it is favored in high-temperature catalytic and metallurgical applications. At room temperature, the white to pale yellow crystalline powder maintains its structure and chemical integrity. Its defining feature is exceptional water solubility—about 304 grams per 100 grams of water at 20°C—which sharply contrasts with APT's poor solubility of under 2%. This solubility enables homogeneous catalyst preparation for petroleum refining, where AMT serves as the primary tungsten-based catalyst precursor. The compound's aqueous solutions remain stable, and its slightly acidic nature (pH around 3-4) suits various chemical processes. With no hazardous components, AMT is also used in producing tungsten metal powder, alloy steel additives, fire-retardant fabrics, and ceramic applications. Its thermal resilience allows processing at elevated temperatures without decomposition, making it versatile across demanding industrial environments.