Laboratory freeze dryers preserve samples by freezing the material and then allowing sublimation to occur. This water-removal process is also known as lyophilization. Typically, laboratory freeze dryers are used in clinical, medical, and pharmaceutical applications. They are also used in the food processing and biotechnology industries. Some laboratory freeze dryers comply with regulations from the U.S. Food and Drug Administration (FDA), or meet the FDA’s Current Good Manufacturing Practices (cGMP). Others are rated for clean room applications, or use a cooling method that is free of chlorofluorocarbons (CFCs). Water cooled, Teflon coated, and double-chamber laboratory freezer dryers are also available. Teflon is a registered trademark of E.I. DuPont de Nemours & Co., Inc.