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Black EPDM rubber cold shrink tube, 6 inch length, 0.56 inch inner diameter before shrinking

3M

3M 8423-6 Cold Shrink Tube Medium Wall 2:1 Shrink Ratio 0.56 in I.D

SKU CH-B626-591CS

Medium-wall EPDM rubber tube shrinks 2:1 from 0.56 in to 0.31 in for 6–4 AWG wire, resists UV and temperatures from -40 to 194 °F, and provides 1,000 V dielectric strength

  • Cold-shrink design installs without heat tools
  • Medium-wall EPDM rubber resists UV and weathering
  • 2:1 shrink ratio seals 6 AWG to 4 AWG wires
  • Dielectric strength of 1,000 V protects connections
  • Operates from -40 °F to 194 °F

3M 8423-6 Cold Shrink Tube

The 3M 8423-6 is a medium-wall cold shrink tube made from EPDM rubber. It arrives pre-expanded on a removable core and shrinks to a tight seal without the need for a heat gun. The tube suits electricians and maintenance crews who need reliable insulation on 6 AWG to 4 AWG wire in the field.

Shrink ratio and dimensions

A 2:1 shrink ratio reduces the inner diameter from 0.56 in to 0.31 in, while the wall thickness settles at 0.12 in after shrinking. The six-inch length covers a standard splice or termination. UV-resistant black rubber withstands outdoor exposure, and the material operates from -40 to 194 degrees F.

Electricians needing flame-retardant

This tube is not flame retardant and carries no adhesive lining, so buyers who require those properties should look elsewhere. It is also sized only for the stated wire range; installers working with larger or smaller conductors will need a different diameter.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $21.99
Cheaper than about 90% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand name3M

Questions about this item

Does the EPDM rubber tube need any maintenance or replacement once it is shrunk onto a 6 AWG to 4 AWG wire?

The cold-shrink tube is a single-use insulator; after it shrinks to 0.31 in I.D. and 0.12 in wall thickness it stays in place with no further servicing required.

What is the first limit reached when the tube operates continuously at its maximum temperature rating?

The upper temperature limit is 194 °F; sustained exposure above that point exceeds the material rating.

How much heat does the tube itself generate when it is left on a live conductor all day?

The tube is passive EPDM rubber with no adhesive lining, so it produces no heat of its own during continuous operation.

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