Transparent polycarbonate cover and polypropylene base will not shatter or implode at full vacuum when used according to instructions. Desiccator body is impervious to all solid desiccants, including acids and alkalies. No gasket necessary, no need to draw a vacuum to make cover airtight -- only grease is needed. Recessed rim on cover keeps grease off bench-top when cover is set down. Desiccator takes any standard 230-mm desiccator plate, such as 06521-00 (order separately). Desiccator is autoclavable.