MIL-PRF-46176B
TABLE II. Effects on rubber.
Test
Volume
Base diameter
Hardness
temperature,
swell,
change,
change,
Type
Test specimen
°C
%
mm
IRHD
70 ± 2
+5 to +20
0.15 to 1.40
0 to 10
RM-3; SAE wheel
SBR
cylinder test cup
120 ± 2
+5 to +20
0.15 to 1.40
0 to 15
70 ± 2
0 to +10
0 to 10
RM-69; EPDM
EPR
slabstock, 25.4 mm x
120 ± 2
25.4 mm
0 to +10
0 to 10
Natural
70 ± 2
NR-X cup
+5 to +20
0.15 to 1.40
0 to 10
rubber
3.4.2.4 Condition of specimens. The test specimens shall show no sloughing, tackiness,
blisters, or any other form of disintegration after exposure to the brake fluid as specified in 4.3.4.2
(see 4.3.4.2.4).
3.5 Support and ownership requirements.
3.5.1 Compatibility. The compatibility between the brake fluid to be tested and all other
brake fluids qualified under this specification shall be demonstrated by meeting the requirements
specified in 3.5.1.1 through 3.5.1.4 (see 4.3.5.1).
3.5.1.1 Fluid mixture transparency at -40°C. A 50/50 mixture of the brake fluid to be
tested and a previously qualified brake fluid, as specified in 4.3.5.1, shall be transparent after
being subjected to a temperature of -40 ± 2°C for 24 ± 2 hours (see 4.3.5.1.1).
3.5.1.2 Fluid mixture transparency at 60°C. The brake fluid mixture as specified in
3.5.1.1 shall be transparent after being subjected to a temperature of 60 ± 2°C for 24 ± 2 hours
(see 4.3.5.1.2).
3.5.1.3 Fluid mixture sediment. The brake fluid mixture as specified in 3.5.1.1 shall not
contain more than 0.05% of sediment by volume after being subjected to a temperature of
60 ± 2°C for 24 ± 2 hours (see 4.3.5.1.3).
3.5.1.4 Fluid mixture transparency at 25°C. The brake fluid mixture as specified in
3.5.1.1 shall regain its original degree of clarity after stabilizing at 25 ± 5°C (see 4.3.5.1.4).
3.5.2 Product identification. In addition to the marking requirements specified in the
contract, each brake fluid container shall contain the following information (see 4.3.5.2):
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