According to 'GB/T 26033-2010 Ammonium Metatungstate', the standard for water-insoluble substances in ammonium metatungstate is that, at room temperature, the water-insoluble substances measured with a solution containing 650g/L of tungsten trioxide do not exceed 0.05%.

According to China Tungsten Online, the rare earth price trend in China in February 2025 exhibited a fluctuating upward movement.

The predicted average price by the Ganzhou Tungsten Association and the long-term contract quotations of major tungsten enterprises from February 2024 to February 2025.

According to China Tungsten Online, the tungsten market in China exhibited an overall downward trend in February 2025, primarily attributed to the implementation of export control policies on tungsten-related items, price reductions in long-term contracts by major tungsten enterprises, and persistently weak downstream demand.