A-A-52524A
3. SALIENT CHARACTERISTICS
3.1 Materials. Unless otherwise specified herein, in the applicable drawing, or in the CID
Specification Sheet (CIDSS), materials shall be in accordance with the manufacturer's
specifications/drawings. The use of recovered material made in compliance with regulatory
requirements is acceptable providing that all requirements of this CID are met (see 4.1).
3.2 Design and construction. The sealing member shall be leather , synthetic elastomer or
mechanical- roll felt , molded or mechanically clamped to a rigid or semirigid case, single or
multiple lip. Seals shall be constructed to the class and dimensions specified in the applicable
drawings, or in A-A-52524/1 through A-A-52524/18 (see 7.2).
3.3 Performance.
3.3.1 Leakage. The maximum leakage of the lubricant from the seals shall be not more than
0.5 grams per hour for any 24 hour period of testing. There shall be no leakage during any
shut- down period.
3.3.2 Elevated temperature. Seals, when operated at elevated temperatures of 170 +3°F for
class 1, 200 +3°F class 2, and 300 +3°F for class 3, shall evidence no leakage greater than that as
specified in 3.3.1.
3.3.3 Low temperature. Seals shall evidence no cracks on the sealing lip after operating at a
temperature of minus (-) 65 +2°F.
3.3.4 Corrosion. Corrosion resistant seal cases or springs shall evidence no corrosion or damage
affecting use and shall meet the requirements specified in 3.3.1 after exposure to salt spray (fog)
in accordance with ASTM B117 minimum for 96 continuous hours.
3.4 Finish. When specified (see 7.2), the metallic case of the seal shall be zinc coated as per
ASTM B633, Fe/Zn, type II. Corrosion resistant steel cases shall be passivated with a nitric acid
solution. When specified (see 7.2), leather sealing members shall be mold-proofed. Springs shall
not be coated. When corrosion resistance is required, a spring of corrosion resistant steel shall be
specified (see 7.2). Corrosion tests (see 3.3.4) shall be performed only when plating of cases, or a
spring of corrosion resistant steel is specified. The outer metal press fit casing surface shall have a
finish of 125 microinches, root-mean-square maximum.
3.5 Identification and marking. Identification and marking of this seal shall be permanent and
legible and shall include as a minimum, the manufacturer's identification code (CAGE) and the
part identification number (PIN) or the applicable drawing number (see 7.2).
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