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Drying is a low cost, relatively low-temperature process where the biological or active ingredient is not harmed/degraded/oxidized by pulling vacuum to evaporate liquids from the solids. Pharmaceutical/Biological products are dried to remove solvents, water, etc. and typically require a vacuum below 1 torr in the final drying stage. The remaining cake is granulated, blended, and pressed into pills. The low residual moisture levels make the product useful for long-term storage. 

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