MIL-DTL-20078D
4.3.2 Sampling for visual and dimensional examination. From each lot, a random sample of gaskets shall
be selected for visual and dimensional examination (see 4.4.1), in accordance with ANSI Z1.4 for general
inspection level II. MIL-STD-289 shall be used to identify defects in rubber gaskets.
4.3.3 Disposition of sample units. Sample gaskets which have been subjected to visual and dimensional
examination (see 4.4.1) and determined to have one or more major defects shall not be offered for delivery to the
Government.
4.4 Examinations and tests.
4.4.1 Visual and dimensional examination. Each of the sample gaskets selected in accordance with 4.3.2
shall be visually and dimensionally examined to verify conformance with this specification. MIL-STD-289 shall
be used to identify defects.
4.4.2. Hardness. The hardness shall be determined by test method ASTM D 2240 (see 3.2.1).
4.4.3. Adhesion. Adhesion shall be tested in accordance with method B of ASTM D 429. The adhesion
shall meet the requirements of 3.2.3.
4.4.4. Sealing pressure. Sealing pressure shall be determined by test method 3211 of FED-STD-601.
The sealing pressure shall meet the requirements of 3.2.4.
4.5 Toxicity. To determine conformance with the requirements of 3.5, the gasket material shall be
evaluated using the HHA process. Sufficient data to permit a HHA of the product shall be provided by the
manufacturer/distributor to the NAVENVIRHLTHCEN. To obtain current technical information requirements
specified by the NAVENVIRHLTHCEN, see 6.4.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract
or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel,
these personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging
requirements are maintained by the Inventory Control Point's packaging activities within the Military Service or
Defense Agency, or within the military service's system command. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. Types A-1 and A-2 gaskets are intended for use where tightness is desired between two
flat surfaces, and are designed to be fastened by American National Standard No. 10 screws and cemented to hatch
covers or ballistic doors by a non-hardening acetone cement. Type B gaskets are fitted to retainer strips and
secured with adhesive, 1/8 inch by 5/8-inch flat bar and No. 10 screws. These gaskets are of interest to the US
Navy because they are used with shipboard unique enclosures that have rigorous performance requirements.
6.2 Acquisition requirements. Acquisition documents should specify the following:
(a)
Title, number and date of this specification.
(b)
Type and number or length (see 1.2).
(c)
When first article is required (see 3.1).
(d)
Is Material Safety Data Sheet required? (see 6.3).
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