MIL-PRF-2863C(SH)
4.4
Tests.
4.4.1 Resilience of metal rings. Six packing rings shall be placed on a
close-fitting metal rod mounted on a supporting base. The height of the stack
of six rings (designated H1) shall be measured. A weight of 70 pounds shall
be placed on the top of the stack for a period of five minutes and the height
(designated H2) again measured. H2 is measured prior to removal of the 70-lb
weight and shall be measured within 30 seconds of the end of the five-minute
period. Record the following measurements and calculation:
1)
H1
2)
H2
3)
H1 - H2 = absolute compression
4.4.2
Detrimental materials for grade B packing rings.
Halogen content 500°F leach test.
4.4.2.1
a) Two packing material test specimens shall be taken. Each test
specimen shall weigh not less than 15 grams and shall be taken from a
different sample. The test specimen of packing material shall be
representative of the sample cross section.
b) The test specimens shall be cut into pieces not larger than 1/8 by
1/4 inch.
c) Each test specimen shall be weighed, transferred to a pressure vessel
(that is, Parr bomb or equivalent) covered with 200 to 300 mL of
distilled or demineralized water and maintained at approximately
500°F (260°C) for a minimum of 6 hours. The leach water shall then
be separated by filtration and the filter rinsed. A blank
determination shall be run using similarly cleaned equipment and
distilled or demineralized water from the same source.
d) The constitution of bromide, chloride and fluoride ions in each
filtrate shall be determined by the blank determination and ASTM D
1246, ASTM D 512 and ASTM D 1179 respectively or ASTM D 4327. NAVSEA
approval to use equivalent analysis methods is not required but
should be highlighted in the test information.
e) The results of each test shall be calculated as net ppm of
extractable halide ion by weight of the test specimen.
4.4.2.2 Sulfur concentration. Any standard test method, such as ASTM D 516 or
ASTM D 4327, may be used to determine total sulfur concentration. The
following 500°F-leach test shall be used to determine water-leachable sulfur
concentration:
a) Cut two specimens from the selected sample, weighing approximately 20
grams, record their weight to 0.1 gram and identify them as specimens
A and B. This identification shall be maintained through the test.
b) Each test specimen shall be transferred to a suitable pressure vessel
(Parr reaction vessel, or equivalent), covered with enough distilled
water to obtain a final volume of 500 ml and heated at 500° ± 10°F
for a minimum of 6 hours. The leach water shall then be separated by
filtration and the filter rinsed. A control filtrate shall be run
using similarly cleaned equipment and distilled water from the same
source.
c) Using aliquots from the control filtrate and filtrates A and B, the
concentration of sulfur ions in each filtrate shall be determined by
an appropriate method of ASTM D 516 or by an equivalent method. The
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