The different metal recoveries from sludges or powders vary on the application and the dryness of the materials. Many times these sludges or powders are produced from different filtration processes and should be shipped in a careful way. These items should be properly secured as well as stored in a leak-proof container for shipping. These items will be paid out based on the metal recovery (especially for sludge). Generally made up of 50-70% tungsten and 5-20% cobalt materials, these have to be drained and analyzed for pricing.