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Black 3M cold-shrink tube 3.69 in ID 18 in length

3M

3M 8430-18 Cold Shrink Tube Medium Wall 2:1 3.69 in I.D. 18 in Length video accessory

SKU CH-T0RE-77MSB

Medium-wall cold-shrink EPDM rubber tube fits 1250–2000 MCM cable, shrinking from 3.69 in to 1.68 in over 18 in length with .06 in wall and 1,000 V dielectric strength

  • TypeCable Management & Conduit
  • ColorBlack
  • Medium-wall EPDM rubber resists UV and extreme cold
  • Shrinks 2:1 from 3.69 in to 1.68 in I.D.
  • Fits 1250–2000 MCM cables for secure insulation
  • Operates from -67 °F to 500 °F continuous
  • 18 in length with 0.06 in wall after shrinking

3M 8430-18 Cold Shrink Tube for cable protection

The 3M 8430-18 is a black EPDM rubber cold shrink tube designed for cable management and conduit applications. It requires no heat source to install, making it suitable for field repairs and installations where open flame is impractical. The medium-wall construction provides mechanical protection for wire sizes from 1250 MCM to 2000 MCM. Supplied as individual 18 in pieces.

2:1 shrink ratio with 3.69 in expanded I.D.

This tube has a 2:1 shrink ratio with an inside diameter of 3.69 in before shrinking and 1.68 in after shrinking. The wall thickness after shrinking is .06 in. It offers a dielectric strength of 1,000 V and operates across a temperature range of -67 to 500 degrees F, with a maximum continuous rating of 194 degrees F. The material is UV light-resistant and not adhesive-lined.

Suited for electricians sealing large cables

Installers who need a flame-retardant, flexible insulator for large-diameter cables will find this tube effective. It is not for buyers who want an adhesive-lined seal for waterproofing. It is also not for applications requiring a shrink ratio higher than 2:1 or an expanded I.D. smaller than 3.69 in.

Highlights

  • Medium-wall EPDM rubber resists UV and extreme cold
  • Shrinks 2:1 from 3.69 in to 1.68 in I.D.
  • Fits 1250–2000 MCM cables for secure insulation
  • Operates from -67 °F to 500 °F continuous
  • 18 in length with 0.06 in wall after shrinking

Specifications

Brand3M
TypeCable Management & Conduit
ColorBlack

Questions about this item

What does the 2:1 shrink ratio mean for the tube once it is installed on a cable?

The tube starts at 3.69 inches inside diameter and shrinks down to 1.68 inches, giving a tight seal around cables sized 1250 MCM to 2000 MCM.

What voltage level does the dielectric strength rating of 1,000 V cap in practice?

The material withstands up to 1,000 volts before electrical breakdown, so it suits low-voltage and medium-voltage insulation tasks within that limit.

What clearance is needed to slide the 18-inch tube over a connector before shrinking?

You need at least 3.69 inches of inside diameter clearance to pass the expanded tube over the connector, then it shrinks to a 0.06-inch wall thickness.

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