MIL-DTL-5516D
4.4.4.2 Tests. The tests shall consist of those tests specified under "Test Methods" (4.5) for the
following properties, using the number and sizes of specimens indicated:
Class A Material
(a)
Permanent set
(b)
Corrosion and adhesion
(c)
Volume change
4.4.4.3 Rejection and retest. Failure of any of the test specimens to conform to the process
evaluation requirements of this specification shall require a retesting of an additional set of
specimens. In the event of failure of any of the test specimens in the retest no finished products
on hand or later production shall be accepted until the extent and cause of failure have been
determined, corrected and action taken to preclude recurrence. After correction, all of the tests in
4.4.3.2 will be repeated. Full particulars concerning the failure and action taken to correct the
deficiencies shall be recorded as part of the inspection records.
4.4.4.4 Test conditions. The test fluid shall be an oil which has been listed or approved for listing
on QPL-5606 with 26 - 28% swell of standard synthetic rubber. The oil and samples to be aged
shall be put into a non-pressurized closed container or a reflux-type condenser to prevent
distillation of the volatile matter in the fluid. A new batch of fluid shall be used for each aging test.
In all cases, the ratio of quantity of fluids to the weight of the seals being aged shall be 20 ml of
fluid for every gram of seals. Seals shall be loosely separated in the fluids.
4.5 Test methods.
4.5.1 Original physical properties of material. The physical properties listed below shall be
determined as specified in the following ASTM Standard Test Methods, table I herein, and as
noted. During first article tests only, the manufacturer shall report all values for each sample
tested as well as the average value for each size:
(a)
Hardness: ASTM D2240
(b)
Tensile strength: ASTM D412
(c)
Ultimate elongation: ASTM D412
(d)
Tensile stress (modulus): ASTM D412
(e)
Permanent set: See 4.5.1.3
(f)
Specific gravity: ASTM D792
4.5.1.1 Hardness. Hardness of class A compounds shall be determined as specified in 4.5.1,
except that test samples shall be compression molded .25 inch (6.35mm) thick, and shall be no
smaller than 1 inch (25.4mm) in diameter. Two .125 inch (3.175mm) sheets shall not be used.
Hardness checks shall not be made on actual packings.
4.5.1.2 Class A material specimens. Tensile strength, ultimate elongation, tensile stress
(modulus), and permanent set, of class A material only, shall be made on standard dumbbell
specimen made of .075 inch (1.905mm) platen sheets. (See 4.5.1)
4.5.1.3 Class A material permanent set. Permanent set test for Class A material shall be made
by stretching the dumbbell specimen at the rate of 2 inches (50.8mm) per minute to an elongation
of 50 percent, holding for 10 minutes, releasing the load, and measure set after 10 minutes' rest.
4.5.1.4 Specific gravity. Specific gravity for class A materials shall be determined on the finished
AN6225 rings.
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