MIL-PRF-87257B
(7) There shall be no pitting, etching, or visible corrosion on the surface of the metals
when viewed under magnification of 20 diameters.
(8) A slight discoloration shall be permitted.
(9) Any corrosion (discoloration) produced on the surface shall be not greater than a
No. 3 of the ASTM D 130 copper corrosion standard.
(10) The flame shall not continue to burn when the source of ignition is removed.
(11) A ring of small bubbles around the edge of the graduate shall be considered
complete collapse.
(12) See 4.4.4.
(13) No evidence of gelling, clouding, crystallization, solidification, or separation of
ingredients.
(14) The container shall be thoroughly shaken immediately prior to withdrawing the
sample. Two determinations per sample are required. Each determination shall be
made on 100-ml portions of the sample.
(15) Particle count may also be measured by the use of the optical procedure
detailed in method ASTM F 312 in lieu of a HIAC counter (Model HIAC Royco 8000A)
or equivalent. See 4.4.5.
(16) Hexane shall be used instead of ozone depleting solvents.
(17) Use standard synthetic rubber NBR-L (as referenced in AMS 3217/2) within 12
months of date of manufacture. Store under 60°F. See 6.4.
(18) The fully blended product shall be clear and transparent, with no separation of
ingredients or evidence of crystallization, and shall conform to all requirements of this
specification.
(19) Homogeneous and free from suspended matter, grit, or other adulteration.
TABLE II. Particle count.
Particle size range (largest dimension),
Allowable number (max) each
micrometers
determination, automatic count
5-15
10,000
15-25
1,000
25-50
150
50-100
20
Over 100
5
8
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