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D. Thermal Shock
Assembled units from the fluid resistance test were used
for the thermal shock evaluation. The units were subjected
to 15 cycles of the following thermal shock sequence:
1.
2.
3.
4.
30 minutes at -66?F/ -55?C.
5 minutes at 74?F/23?C.
30 minutes at 500?F/260?C.
5 minutes at 74?F/23?C.
The insulation resistance values and results of test are
found in Table 3.
F l u i d
T e s t
I n s u l a t i o n
R e s i s t a n c e
W i t h s t a n d
R e s u l t
M o n s a n t o L . D .
J e t A
M I L - L - 7 8 0 8
M I L - L - 2 3 6 9 9
5 % S a l i n e
B e f o r e
A f t e r
B e f o r e
A f t e r
B e f o r e
A f t e r
B e f o r e
A f t e r
B e f o r e
A f t e r
1 . 5 x 1 0 1 3 o h m s
1 . 0 x 1 0 1 2 o h m s
7 . 0 x 1 0 1 2 o h m s
1 . 7 x 1 0 1 2 o h m s
3 . 5 x 1 0 1 2 o h m s
6 . 5 x 1 0 1 2 o h m s
8 . 0 x 1 0 1 2 o h m s
3 . 5 x 1 0 1 2 o h m s
9 . 0 x 1 0 1 2 o h m s
6 . 5 x 1 0 1 2 o h m s
2 5 0 0
2 5 0 0
2 5 0 0
2 5 0 0
2 5 0 0
2 5 0 0
2 5 0 0
2 5 0 0
2 5 0 0
2 5 0 0
V - r m s
V - r m s
V - r m s
V - r m s
V - r m s
V - r m s
V - r m s
V - r m s
V - r m s
V - r m s
P a s s
P a s s
P a s s
P a s s
P a s s
P a s s
P a s s
P a s s
P a s s
P a s s
Table 3
E. Altitude
Electrical integrity at high altitudes was determined by
testing to Mil Standard 1344A, Test method 1004.1.
Typical test values are found in Table 4.
1 . 8 x 1 0 o h m s
Altitude
5 0 , 0 0 0
7 0 , 0 0 0
I n s u l a t i o n
R e s i s t a n c e
1 . 0 x 1 0 1 1 o h m s
1 2
W i t h s t a n d
2 5 0 0 V - r m s
2 5 0 0 V - r m s
R e s u l t
P a s s
P a s s
Table 4
F. Heat Aging
Installed silicone rubber insulators were subjected to an
eight hour heat aging test at 500?F/260?C. Other units were
subjected to 401?F/205?C for 30 days. The silicone rubber
remained resilient and showed no sign of deterioration.
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