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MIL-PRF-5606 Hydraulic Fluid, Petroleum Base; Aircraft, Missile, And OrdnanceThis specification describes the characteristics and provides the requirements for a petroleum base hydraulic fluid for use in the -54 Deg. C to +135 Deg. C temperature range \(see 6.1\). This fluid is identified by military symbol OHA and NATO Code No. H-515 \(see 6.5\).

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MIL-PRF-5606H
3.3  Properties of petroleum base stock
The properties of the petroleum base stock used in formulating the finished fluid shall be
as designated in table I when tested as specified in 4.4.3.
TABLE I. Properties of petroleum base stock.
Property
Test Limits
Pour point. °C (max)
-60
Flash point, °C (min)
82
Acid number (max)
0.10
Color, ASTM standard (max)
No. 1
Specific gravity at 15.6°C/15.6°C
Report1
(60.0°F/60.0°F)
1 Samples of base stock submitted for acceptance tests shall
not vary by more than +0.008 from the specific gravity of the
original sample submitted for qualification tests.
3.4  Properties of finished fluid
The properties of the finished fluid shall be as specified in table II, 3.5, and 3.6 when
tested as specified in 4.4.3.
5



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