MIL-HDBK-212, MILITARY HANDBOOK: GASKET MATERIALS (NONMETALLIC) (26 SEP 1958)., The primary objective of this handbook is to provide in a condensed form information of direct usefulness to interested military personnel. Although the handbook is general only, and is not applicable to aircraft practice, the data have been selected from a large number of industrial and government publications and have been checked for suitability for use in design.