MIL-PRF-87257B
formulation and composition of the finished fluid, and laboratory data that show quantitative
results of all the tests required by this specification except storage stability. Separate
qualification inspection is required for each base stock used. The samples should be plainly
identified by securely attached, durable tags or labels marked with the following information:
Sample for Qualification Inspection
HYDRAULIC FLUID, FIRE RESISTANT; LOW TEMPERATURE, SYNTHETIC
HYDROCARBON BASE, AIRCRAFT AND MISSILE METRIC, NATO CODE NUMBER H-538.
Specification MIL-PRF-87257
Name of ingredient (for ingredient material)
Name of manufacturer
Product code number
Date of manufacture
6.3.2.2 Formulation sheets
An example format for the formulation sheet, indicating the percent by weight and purpose of
each ingredient, is as follows:
Base stock(s)
percent
(chemical composition, CAS number, manufacturer's name and number)
Blending fluid
percent
(chemical composition, CAS number, manufacturer's name and number)
Anti-wear additive
percent
(chemical composition, CAS number, manufacturer's name and number)
Oxidation inhibitor
percent
(chemical composition, CAS number, manufacturer's name and number)
Other additives
percent
(chemical composition, CAS number, manufacturer's name and number)
6.4 Standard synthetic rubber samples
Samples of the standard synthetic rubber NBR-L (see table I) should subscribe to the
formulation in accordance with SAE AMS 3217/2. A suggested source (material) is Akron
Rubber Development Laboratory (ARDL), 300 Kenmore Blvd., Akron OH 44301.
6.5 International standardization agreements
Certain provisions of this specification (see 1.1) are the subject of international standardization
agreements, ASCC Air Standards 15/1 and 15/7 and NATO STANAGs 1135 and 3748. When
amendment, revision, or cancellation of this specification is proposed which will modify the
international agreement concerned, the preparing activity will take appropriate action through
international channels, including departmental standardization offices, to change the agreement
or make other appropriate accommodations.
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