Tungsten-copper heat sinks are composite materials that combine high thermal conductivity with a low coefficient of thermal expansion. 

According to 'GB/T 26033-2010 Ammonium Metatungstate', during the transportation of ammonium metatungstate, it is necessary to take care to prevent moisture and avoid severe collisions. The product shall be stored in a dry, ventilated place free from acidic or alkaline atmosphere. From the date of receiving the product, the storage period for spray - dried material shall not exceed six months, and that for crystalline material shall not exceed one month.

According to 'GB/T 26033-2010 Ammonium Metatungstate', ammonium metatungstate is generally packaged in iron drums, lined with polyethylene plastic bags for sealing. If there are special requirements for packaging, they shall be determined through negotiation between the supplier and the buyer. The weight of each package shall also be determined through negotiation between the supplier and the buyer.

According to 'GB/T 26033-2010 Ammonium Metatungstate', the appearance quality standard for ammonium metatungstate is that the product appears as a white powder or light yellow crystals, with no visible foreign matter or lumps upon visual inspection.

According to 'GB/T 26033-2010 Ammonium Metatungstate', the pH standard for ammonium metatungstate is that, at room temperature, the pH value measured with a solution containing 650g/L of tungsten trioxide does not exceed 4.5.

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%.

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 rare earth price trend in China in February 2025 exhibited a fluctuating upward movement.

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.

According to China Tungsten Online, the molybdenum price trend in China remained relatively stable in February 2025. In terms of average price: