MIL-DTL-20078D
3.3.2 Type A-2, corner section. Corner sections shall conform to Figure 2.
3.3.2.1 Tolerances. A tolerance of ± 1/64 inch shall be permitted in the 6-5/16-inch dimensions,
measured to the centers of the end holes in the metal strip. A tolerance of ± 1/16 inch in the throat radius will be
permitted. Tolerances in width and thickness shall be as follows:
Width: plus 1/16 inch, minus 0.0 inch.
Thickness (total): plus 1/16 inch, minus 0.0 inch.
Thickness from ungrooved surface of rubber to metal strip: ± 1/32 inch.
3.3.3 Type B, two-line rubber. Type B shall be molded to the size shown on Figure 3.
3.3.3.1 Tolerances. Tolerances shall be as shown on Figure 3.
3.4 Workmanship. Rubber and metal shall be free from defects that might affect their serviceability;
adhesion of rubber to metal shall be uniform throughout contacting surfaces; metal strips shall be centered; the
ungrooved surface of gaskets shall be free from pits, indentations, projections, or bubbles. Pits or indentations on
the corrugated surface shall be not less than 5 inches apart in the lengthwise direction on types A-1 and A-2. Type
B shall be smooth and free from cracks and other obstructions.
3.5 Toxicity. The gasket material shall have no adverse effect on the health of personnel when used for
its intended purpose. The gasket material shall be assessed by the Navy Environmental Health Center
(NAVENVIRHLTHCEN) using the administrative Health Hazard Assessment (HHA). A flowchart for this process
can be found as enclosure (1) of BUMEDINST 6270.8. The HHA is a review of the gasket material based on
information submitted by the manufacturer, to assess health hazards associated with the handling, application, use
and removal of the product. The gasket material shall not cause any environmental problems during waste disposal
(see 4.5 and 6.4).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
(a) First article inspection (see 4.2).
(b) Conformance inspection (see 4.3).
4.2 First article inspection. First article inspection shall be performed by the contractor, after award of
contract and prior to production, utilizing test specimens prepared from the material stock proposed to be used for
construction of the gaskets. Three tests shall be performed:
(a) Hardness test (see 4.4.2).
(b) Adhesion test (see 4.4.3).
(c) Sealing pressure test (see 4.4.4).
One test specimen shall be provided for each test in accordance with the test methods specified herein.
4.2.1 First article inspection report. The contractor shall furnish a first article inspection report in
accordance with the data ordering document included in the contract (see 6.2).
4.3 Conformance inspection.
4.3.1 Inspection lot. An inspection lot shall consist of all gaskets of the same type produced under
essentially the same conditions, and offered for inspection at one time.
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