8440 Series Cold Shrink Datasheet by 3M

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3M™ Cold Shrink Silicone Rubber

Connector Insulators 8440 Series

Product

Description

3M™ Cold Shrink Connector Insulators 8440 Series are open-ended, silicone rubber, tubular

sleeves. The sleeves are factory expanded and assembled on a removable supporting plastic core.

Each rubber assembly is supplied for field installation in this pre-stretched condition. As the core is

unwound, the insulating sleeve shrinks to form a tight seal. Three sizes of Cold Shrink Insulators

cover terminal lug barrels and inline connectors. Collectively, the insulators have an application

range of 0.35" (8,86 mm) to 0.95" (24,13 mm) for installations on #6 AWG to 3/0 AWG.

Features  Simple installation requires only workman's hands

 No tools required

 No heat required for installation

 Seals tight, retains its resiliency and pressure even after prolonged years of aging and exposure

 Resists moisture

 Wide range, size accommodation

 Resists acids and alkalies

 Resists ozone and ultraviolet light

 Resists fluid splashes

 Resists fire - will not support flame

 Operating temperature range -66ºF to 500ºF ( -55ºC to 260ºC)

Data Sheet May 2014

Applications

 Primary electrical insulation for all solid dielectric (rubber and plastic) insulated wire and cable

splices rated to 1000 volts

 Electrical Aircraft cables

 For indoor and outdoor use, in cable tray or overhead applications

 Top moisture sealing for medium voltage, air insulated connectors and lugs

 Insulation of secondary splices, copper and aluminum conductors

 Sheath repairs

 Insulation of inline conductor transition connectors

Loose Cure End / ¥ P)asl1cSu omn Core pp 9 —>‘ 3/8“ ‘4— A _> (9,5 mm) min Application Range Dimens Par! Cable Range Inches (mm) Inches ( . . Max. Dia. Number Mm. Dla. [A] AWG (or Seal "3:33? Length 844372 . 0.560 1.4 (36) 84438.5 6 2 0'30 (7’6) (14.22) 5.2 (132) 84452.5 . 0.720 1.7 (43) 844575 2 “0 0'37 (9’4) (18.29) 6.2 (158) 84478.2 . 0.950 2.3 (57) 84478 W 3/0 049(12’4) (24.13) 6.8 (172) Table 1 2015

3M™ Cold Shrink Silicone Rubber Connector Insulators 8440 Series

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3/8”

(9,5 mm)

min

Typical

Physical

Properties

Typical

Electrical

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.

Physical Property (Test Method) Typical Value US unit (metric)

Colo

Gray

100% Modulus (ASTM D 412) 180 psi (1,24 MPa)

Ultimate Tensile (ASTM D 412) 1240 psi (8,55 MPa)

Die B Tear (ASTM D 624B) 185 psi (1,28 MPa)

Hardness (ASTM D 2240) 48 Shore A

Specific Gravity 1.23

Electrical Property (Test Method) Typical Value US unit (metric)

Dielectric Strength

(ASTM D 149) @ 1,78 mm thickness 554 V/mil (21,8 mV/m)

Dielectric Strength

168 hours in H2O @ 194°F (190°C) 543 V/mil (21,4 mV/m)

Part

Number

Cable Range Application Range

Inches (mm) Dimensions

Inches (mm)

AWG Min. Dia.

for Seal

Max. Dia.

Insulator

Covers

[A]

Length [B]

Core I.D.

8443-2 6 - 2 0.30 (7,6) 0.560

(14,22) 1.4 (36) 0.68 (17,3)

8443-6.5 5.2 (132)

8445-2.5 2 - 1/0 0.37 (9,4) 0.720

(18,29) 1.7 (43) 0.84 (21,3)

8445-7.5 6.2 (158)

8447-3.2 1/0 - 3/0 0.49 (12,4) 0.950

(24,13) 2.3 (57) 1.07 (27,2)

8447-8 6.8 (172)

Table 1

Plastic Supporting Core

Loose Core End

Expanded Silicone Rubber Tube

3M™ Cold Shrink Silicone Rubber Connector Insulators 8440 Series

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Product

Specifications

Exposed metallic connectors joining power cable conductors rated 1000 volts or less shall be

covered with 3M™ Cold Shrink Silicone Tubular Rubber Insulation 8440 Series.

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 and

Architectural

Specifications

A silicone rubber cold shrink connector insulator 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.

Performance

Tests

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.

Humid Environment

Tests to verify electrical integrity through conditions of high humidity were run per Mil Standard

202- Method B. The test duration was 10 days at 104˚F/40˚C and 95% RH. Typical test values are

found in Table 2.

Test Insulation

Resistance Withstand Result

Before 3.0 x

2500 V-rms

Pass

After 2.5 x

2500 V-rms

Pass

Table 2

Ultraviolet Resistance

After 1000 hours of testing in a Weather-O-Meter according to Specifications ASTM D750 and

ASTM G23, the silicone rubber insulation did not exhibit crazing, cracking or change in surface

appearance.

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. 30 minutes at -66˚F/ -55˚C

2. 5 minutes at 74˚F/23˚C

3. 30 minutes at 500˚F/260˚C

4. 5 minutes at 74˚F/23˚C

The insulation resistance values and results of test are found in Table 3.

3M™ Cold Shrink Silicone Rubber Connector Insulators 8440 Series

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Performance

Tests

(continued)

Altitude

Electrical integrity at high at high altitudes was determined by testing to Mil Standard 1344A, Test

method 1004.1. Typical test values are found in Table 4.

Altitude Insulation

Resistance Withstand Result

50,000 1.0 x 1011 ohms 2500 V-rms

Pass

70,000 1.8 x 1012 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 remained resilient and

showed no sign of deterioration.

Fluid Resistance

To determine the effect of a fluid splash on insulated connected assemblies, the units were

subjected to ten cycles of the following 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 Withstand

Fluid Monsanto L.D. Jet

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

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

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

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

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

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

3M™ Cold Shrink Silicone Rubber Connector Insulators 8440 Series

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Maintenance

Components of 3M™ Cold Shrink Silicone Rubber Connector Insulators are stable under normal

storage conditions for a period of three years from the date of manufacture. The cold shrink

insulators are not impaired by freezing or overheating due to the ambient temperatures found in

storage or shipping. Normal storage and stock rotation are recommended.

Approximate Installed Weight

Terminal Lug Insulators Inline Connector Insulators

Part No. Weight

oz. (gm)

Part No. Weight

oz. (gm)

8443-2 0.123 (3.5) 8443-6.5 0.388 (11.0)

8445-2.5 0.190 (.54) 8445-7.5 0.564 (16.0)

8447-3.2 0.335 (9.5) 8447-8 0.776 (22.0)

Table 6

Shelf Life &

Storage

3M™ Cold Shrink Silicone Rubber Connector Insulators 8440 Series have a 3-year shelf life from

date of manufacture when stored in a humidity controlled storage (10°C/50°F to 27°C/80°F and

<75% relative humidity).

Availability

Please contact your local distributor; available from 3M.com/electrical [Where to Buy] or call

1.800.245.3573.

3M is a trademark of 3M Company.

Electrical Markets Division

6801 River Place Blvd.

Austin, TX 78726-9000

800.245.3573

FAX: 800.245.0329

www.3M.com/electrical

Please recycle

78-8124-5813-7 Rev C

Important Notice

All statements, technical information, and recommendations related to 3M’s products are based on information believed to be reliable,

but the accuracy or completeness is not guaranteed. Before using this product, you must evaluate it and determine if it is suitable for

your intended application. You assume all risks and liability associated with such use. Any statements related to the product, which are

not contained in 3M’s current publications, or any contrary statements contained on your purchase order, shall have no force or effect

unless expressly agreed upon, in writing, by an authorized officer of 3M.

Warranty; Limited

Remedy; Limited

Liability

This product will be free from defects in material and manufacture at the time of purchase. 3M MAKES NO OTHER WARRANTIES

INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR

PURPOSE. If this product is defective within the warranty period stated above, your exclusive remedy shall be, at 3M’s option, to

replace or repair the 3M product or refund the purchase price of the 3M product. Except where prohibited by law, 3M will not be

liable for any indirect, special, incidental or consequential loss or damage arising from this 3M product, regardless of the

legal theory asserted.

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8440 Series Cold Shrink Datasheet by 3M

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