3M™ Cold Shrink Silicone Rubber Connector Insulators 8440 Series
4 of 5
Performance
Tests
(continued)
Altitude
Electrical integrity at high at high altitudes was determined by testin g to Mil Standard 1344A, Test
method 1004.1. Typical test values are found in Ta ble 4.
Altitude Insulation
Resistance Withstand Result
50,000 1.0 x 10 11 ohms 2500 V-rms
Pass
70,000 1.8 x 10 12 ohms 2500 V-rms
Pass
Table 4
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 rem ained resilient and
showed no sign of deterioration.
Fluid Resistance
To determine the effect of a fluid splash on insulated connected a ssemblies, the units were
subjected to ten cycles of the followi ng test sequence:
1. One minute fluid soak
2. 24 hour , 74˚F/23˚C ambient dry
3. Insulation resistance measurement
4. 2.4 kV-rms withstand
Results from the fluid resistance test are found in table 5.
Fluid
Test Insulation
Resistance Withstand Result
Monsanto L.D. Before
After 1.5 x 1013 ohms
1.0 x 1012 ohms 2500 V-rms
2500 V-rms Pass
Pass
Jet A Before
After 7.0 x 1012 ohms
1.7 x 1012 ohms 2500 V-rms
2500 V-rms Pass
Pass
MIL-L-7808 Before
After 3.5 x 1012 ohms
6.5 x 1012 ohms 2500 V-rms
2500 V-rms Pass
Pass
MIL-L-23699 Before
After 8.0 x 1012 ohms
3.5 x 1012 ohms 2500 V-rms
2500 V-rms Pass
Pass
5% Saline Before
After 9.0 x 1012 ohms
6.5 x 1012 ohms 2500 V-rms
2500 V-rms Pass
Pass
Fluid Splash Test Insulation Resistance/2500 V-rms Wi th stand
Fluid Monsanto L.D . Jet
A
MIL-L-7808 MIL-L-23699 5% Saline
Initial 1.5 x 1013/Pass 7.2 x 1012/Pass 3.5 x 1012
Pass 8.0 x 1012/Pass 9.0 x 1012/Pass
1
2
3.0 x 109 ohms
1.2 x 109 ohms 2.0 x 1012 ohms
1.2 x 1012 ohms 8.0 x 1012 ohms
2.0 x 1012 ohms 2.5 x 1012 ohms
5.0 x 1012 ohms 3.5 x 1012 ohms
5.0 x 1012 ohms
3
4
4.0 x 107 ohms
1.8 x 107 ohms 1.2 x 1012 ohms
8.0 x 1011 ohms 2.5 x 1012 ohms
3.0 x 1012 ohms 4.0 x 1012 ohms
3.0 x 1012 ohms 3.5 x 1012 ohms
4.0 x 1012 ohms
5
6
8.0 x 106 ohms
6.0 x 106 ohms 3.0 x 1011 ohms
2.0 x 1011 ohms 2.0 x 1012 ohms
1.8 x 1012 ohms 2.5 x 1012 ohms
2.0 x 1012 ohms 6.0 x 1012 ohms
7.0 x 1012 ohms
7
8
5.0 x 106 ohms
4.0 x 106 ohms 1.8 x 1011 ohms
1.0 x 1011 ohms 1.0 x 1012 ohms
1.0 x 1011 ohms 2.5 x 1012 ohms
1.4 x 1012 ohms 9.0 x 1012 ohms
3.0 x 1012 ohms
9
10
4.0 x 106 ohms
3.5 x 106 ohms 1.0 x 1011 ohms
7.0 x 1010 ohms 6.5 x 1011 ohms
5.0 x 1011 ohms 1.0 x 1012 ohms
1.2 x 1012 ohms 3.0 x 1012 ohms
5.0 x 1012 ohms
Table 5