FF-S-2738A
6.2.1.3.1 Environmental tests. Seals that pass or fail the following environmental tests shall not
be rejected based upon these test results. The test results shall be recorded and used as additional
reference material to guide the seal selectee in proper seal selection and application for their
specific requirements. Tests shall be conducted in accordance with MIL-STD-810, methods
502.3, 505.3, 508.4, 509.3, 510.3, 514.4, and 521.1 as follows:
6.2.1.3.1.1. Method 502.3, Low Temperature. Follow Procedure 1 - Storage. Allow two hours
for the test chamber to attain equilibrium. The test duration shall be four (4) hours for non-plastic
seals and 72 hours for plastic seals after the test chamber attains equilibrium. Seals are to be
unprotected. Test temperature to be -60 +/-3 oF.
6.2.1.3.1.2. Method 505.3, Solar Radiation (Sunshine). Follow Procedure II - Steady state for
prolonged actinic effects. Locate temperature sensors as close as practicable to the seals. Test
shall consist of fifteen (15) cycles. Light emissions shall satisfy the full spectrum of Table 505.3-
II. Seals shall be cleaned prior to testing. Suspend/support seals to expose as much surface area
as practicable.
6.2.1.3.1.3 Method 508.4, Fungus. Suspend/support seals to expose as much surface area as
practicable. Test duration shall be forty-five (45) days. Seal functions shall not be inhibited as a
result of these tests.
6.2.1.3.1.4 Method 509.3, Salt Fog. Follow Procedure I - Aggravated screening. Use a salt
concentration of five percent (5%). Alternate twenty-four (24) hour periods of salt fog exposure
and standard ambient (drying) conditions for a total of eight (8) 24 hour periods. Suspend/support
seals to expose as much surface area as practicable.
6.2.1.3.1.5 Method 510.3, Sand and Dust. Follow Procedure I - Blowing dust and Procedure II -
Blowing sand. Relative humidity (RH) shall be less than thirty percent (30%) throughout the
conduct of the tests. Air velocity shall be 8.9 m/s (1750 ft/min.) for blowing dust and 29 m/s
(5700 ft/min.) for blowing sand. For dust: use either red china clay or silicon flour as described in
Method 510.3, section I-3.2d(1)a or b, respectively. For sand: use silica sand 3as described in 3
Method 510.3, section I-3.2d(2). Dust 3concentrations shall be 10.6 +/- 7 g/m (0.3 +/- .2 g/ft ).
Sand concentrations shall be 0.177 g/m (0.0050 g/ft3). Test times to be ninety (90) minutes per
face at 71oC (160oF) for Procedure I - Blowing dust. Test times to be six (6) hours at 23oC (73oF)
per face and six (6) hours at 71oC (160oF) per face for Procedure II - Blowing sand. Seals are to
be non-protected and exposed to the environment. Suspend/support seals to expose as much
surface area of each face as practicable.
6.2.1.3.1.6. Method 514.4, Vibration. Follow Procedure I - Transportation Vibration I-3.3.1
Category I - Basic transportation. Configure seals on mounts or shipping containers similar to
their intended use. Seals must maintain their integrity throughout the tests. Use the test levels for
two-wheeled trailers, Table 514.4-AI, "Random Vibration Program Data for Secured Cargo
Transportation, Composite Two-Wheeled Trailer" for twenty-five (25) hours in each axis.
Representative spectral shapes of wheeled (or two-wheeled) vehicle environments are shown in
Figure 514.4-4 "Representative Spectral Shape, Wheeled Vehicle". Setup as necessary.
Accelerometers should be located as near to seals as practicable.
6.2.1.3.1.7. Method 521.1, Icing/Freezing Rain. Suspend/support seals to expose as much
surface area as practicable. Use the test temperatures, rain delivery methods, and wind velocities
recommended in Method 521.1. Assume a marine environment and add a third thickness of
75mm as suggested in paragraph I-3.1.b-Test Procedures of Method 521.1.
6.2.2 Data requirements. When this specification is used in an acquisition and data is required to
be delivered, the data requirements shall be developed as specified by an approved Data Item
Description (DD Form 1664) and delivered in accordance with the approved Contract Data
Requirements list (DD Form 1423), incorporated into the contract. When provisions of DoD
Federal Acquisition Regulations (FAR) Supplement, Part 27, Sub-Part 27.475-1 are invoked and
the DD Form 1423 is not used , the data should be delivered by the contractor in accordance with
the contractor or purchase order requirements.
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