3M™ Cold Shrink Connector Insulators 8420 Series
2 of 3
Typical
Properties
Not for specifications. Values are typical, not to be considered minimum or maximum.
Properties measured at room temperature 73°F (23°C) unless otherwise stated.
EPDM Rubber
Physical Properties (Test Method)
Typical Value
US units (metric)
Colo
Black
300% Modulus
(ASTM D 412–75)
480 psi
(3,3 MPa)
Ultimate Tensile
(ASTM D 412–75) Original
1400 psi
(9,6 MPa)
Ultimate Elongation
(ASTM D 412–75) Original
750%
Die C Tear
(ASTM D 624C–73) Original
150 pli
(26,3 KN/m)
Fungus Resistance
(ASTM G–21) 28 days exposure
No Growth
Moisture Absorption
7 days 90 °C (194 °F) H
2
O
wt. gain
1.8%
Electrical Properties (Test Method)
Typical Value
US units (metric)
Dielectric Strength
(ASTM D 149–75) Original
@ 1,78 mm
365 v/mil
(14,3 Mv/m)
7 days in H2O at
90 °C (194 °F)
282 v/mil
(11,1 Mv/m)
3M™ Cold Shrink Selection Table
Product Number
Conductor Sizes
AWG & Kcmil
Product Diameter Range (Minimum –
Maximum)* Inches (mm)
Relaxed Tube Length Inches
(mm)
8423–6 6 – 4 0.31 – 0.56 (7,80 – 14,3) 6.0 (152)
8424–8 10 – 1/0** 0.10 – 0.82 (2,54 – 20,9) 8.0 (203)
8425–8 2 – 1/0 0.40 – 0.82 (10,1 – 20,9) 8.0 (203)
8426–9
8426–11
2/0 – 250
2/0 – 250
0.55 – 1.18 (13,9 – 30,1)
0.55 – 1.18 (13,9 – 30,1)
9.0 (229)
11.0 (279)
8427–6***
8427–12
8427–16
—
250 – 400
250 – 400
0.67 – 1.38 (16,8 – 35,1)
0.67 – 1.38 (16,8 – 35,1)
0.67 – 1.38 (16,8 – 35,1)
6.0 (152)
12.0 (305)
16.0 (406)
8428–6***
8428–12
8428–18
—
450 – 800
450 – 800
0.95 – 1.94 (24,0 – 49,3)
0.95 – 1.94 (24,0 – 49,3)
0.95 – 1.94 (24,0 – 49,3)
6.0 (152)
12.0 (305)
18.0 (457)
8429–6***
8429–9****
8429–12
8429–18
—
900 – 1000
900 – 1000
900 – 1000
1.27 – 2.67 (32,2 – 67,8)
1.27 – 2.67 (32,2 – 67,8)
1.27 – 2.67 (32,2 – 67,8)
1.27 – 2.67 (32,2 – 67,8)
6.0 (152)
9.0 (229)
12.0 (305)
18.0 (457)
8430–9***
8430–18
—
1250 – 2000
1.68 – 3.69 (42,6 – 93,7)
1.68 – 3.69 (42,6 – 93,7)
9.0 (229)
18.0 (457)
NOTES:
* Minimum = Seal Diameter Maximum = Connector Clearance Dimension
** Product contains range-extending adapters (Without adapters, 8424–8/8425–8 ranges are identical).
*** Primary uses: Sealing of terminal lug barrels, conduit couplings and conduit–to–cable breakouts.
**** Maximum connector length: 5.625" (For longer connector bodies, select 8429–12/8429–18 as needed).
IMPORTANT: Use wire insulation/jacket diameters and connector O.D. for final sizing confirmation
.