3M Cold Shrink Silicone Rubber Connector Insulators 8440 Series Data Sheet May 2014 Product 3M Cold Shrink Connector Insulators 8440 Series are open-ended, silicone rubber, tubular Description 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 -66F to 500F ( -55C to 260C) 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 1 of 5 3 3M Cold Shrink Silicone Rubber Connector Insulators 8440 Series Not for specifications. Values are typical, not to be considered minimum or maximum. Properties measured at room temperature 73F (23C) unless otherwise stated. Typical Physical Property (Test Method) Typical Value US unit (metric) Physical Color Gray Properties 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) Typical Dielectric Strength 554 V/mil (21,8 mV/m) Electrical (ASTM D 149) 1,78 mm thickness Properties Dielectric Strength 543 V/mil (21,4 mV/m) 168 hours in H2O 194F (190C) Expanded Silicone Rubber Tube Loose Core End B Plastic Supporting Core A 3/8 (9,5 mm) min Application Range Dimensions Cable Range Inches (mm) Inches (mm) Part Max. Dia. Number Min. Dia. A B AWG Insulator for Seal Length Core I.D. Covers 8443-2 0.560 1.4 (36) 6 - 2 0.30 (7,6) 0.68 (17,3) 8443-6.5 5.2 (14,22) (132) 8445-2.5 0.720 1.7 (43) 2 - 1/0 0.37 (9,4) 0.84 (21,3) 8445-7.5 6.2 (18,29) (158) 8447-3.2 0.950 2.3 (57) 1/0 - 3/0 0.49 (12,4) 1.07 (27,2) 8447-8 6.8 (24,13) (172) Table 1 2 of 5