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Expanded Silicone Rubber Tube
Loose Core End
B
Plastic supporting core
3/8"
(9,5 mm)
min.
A
P a r t
C a b l e R a n g e
A p p l i c a t i o n R a n g e
I n c h e s ( m m )
D i m e n s i o n s
I n c h e s ( m m )
N u m b e r
8 4 4 3 - 2
8 4 4 3 - 6 . 5
8 4 4 5 - 2 . 5
8 4 4 5 - 7 . 5
8 4 4 7 - 3 . 2
8 4 4 7 - 8
A W G
6 - 2
6 - 2
2 - 1 / 0
2 - 1 / 0
1 / 0 - 3 / 0
1 / 0 - 3 / 0
M i n . D i a . *
f o r S e a l
. 3 5 0 ( 8 . 8 6 )
. 3 5 0 ( 8 . 8 6 )
. 4 2 0 ( 1 0 . 7 )
. 4 2 0 ( 1 0 . 7 )
. 5 5 0 ( 1 4 )
. 5 5 0 ( 1 4 )
M a x . D i a . * *
I n s u l a t o r C o v e r s
. 5 6 0 ( 1 4 . 2 2 )
. 5 6 0 ( 1 4 . 2 2 )
. 7 2 0 ( 1 8 . 2 9 )
. 7 2 0 ( 1 8 . 2 9 )
. 9 5 0 ( 2 4 . 1 3 )
. 9 5 0 ( 2 4 . 1 3 )
A
L e n g t h
1 . 4 ( 3 6 )
5 . 2 ( 1 3 2 )
1 . 7 ( 4 3 )
6 . 2 ( 1 5 8 )
2 . 3 ( 5 7 )
6 . 8 ( 1 7 2 )
B
I . D . ( C o r e )
0 . 6 8 ( 1 7 . 3 )
0 . 6 8 ( 1 7 . 3 )
0 . 8 4 ( 2 1 . 3 )
0 . 8 4 ( 2 1 . 3 )
1 . 0 7 ( 2 7 . 2 )
1 . 0 7 ( 2 7 . 2 )
Table 1
4.0 Specifications Product
Exposed metallic connectors joining power cable
conductors rated 1000 volts or less shall be covered
with 3M ? 8440 Series Silicone Cold Shrink tubular
rubber insulation.
The inline connections shall be insulated in accordance
with the instructions provided with the 3M ? Cold
Shrink Connector Insulator 8443-6, 8445-7.5, and
8447-8. The connecting barrel portion of terminal lugs
shall be insulated in accordance with the instructions
provided with the 3M ? Cold Shrink Connector
Insulators 8443-2, 8445-2.5, and 8447-3.2.
Engineering/Architectural
A silicone Cold Shrink Connector Insulators must be
capable of normal operation through a temperature
range of -66?F/ -55?C to 500?F/260?C. It must be
usable without additional covering or adhesive both
indoors and outdoors, in cable tray or overhead
applications on cables rated up to 1000V. It must be
applied without additional heat or flame and, when
applied according to manufacturer's directions, be
immediately energizable. It must not support flame or
be adversely affected by moisture, mild acids or
alkalies, ozone or ultraviolet light. It must provide
resistance to aircraft fluids and be compatible with all
rubber and plastic insulated power cables.
5.0 Performance Tests
A. Flammability Test
The test for flammability of the 3M Cold Shrink
Insulators 8440 Series was conducted with specimens
positioned both vertically and horizontally per
specification BSS 7230. The silicone rubber insulation
passed the Flammability Test of BSS 7230 without
supporting a flame. In addition, these insulators were
also subjected to a gas flame test as outlined in
paragraph 4.4.15 of MIL-C-24643A and met the
passing criteria as specified. No fuse was blown
during the one hour flame exposure.
B. Humid Environment
Tests to verify electrical integrity through conditions
of high humidity were run per Mil Standard 202-
Method B. The test duration was for 10 days at
104?F/40?C and 95% RH. Typical test values are found
in Table 2.
C. Ultraviolet Resistance
After 1000 hours of testing in a Weather-O-Meter
according to Specifications ASTM D750 and ASTM
G23, the silicone rubber insulation exhibited no
crazing, cracking or change in surface appearance.
T e s t
B e f o r e
I n s u l a t i o n
R e s i s t a n c e
3 . 0 x 1 0 1 2
W i t h s t a n d
2 5 0 0 V - r m s
R e s u l t
P a s s
A f t e r
2 . 5 x 1 0
1 2
2 5 0 0 V - r m s
P a s s
Table 2
78-8124-5813-7
Page 2 of 4
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