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Six-inch black heavy-wall heat-shrink tubing, adhesive-lined, 3:1 shrink ratio

3M

3M Heavy Wall Heat Shrink Tubing 6 in 3:1 Black Adhesive Lined Wire Cap Connectors

SKU CH-7ZFA-GMXC9

Heavy-wall cross-linked polyolefin tubing shrinks 3:1 to .15 in ID with .09 in wall, adhesive-lined for 12 AWG to 6 AWG wires, abrasion, acid, alkali and UV resistant from -67 to 230 °F

  • Color MappingBlack
  • MaterialHAWA
  • TypeIndustrial and Scientific - Other Industrials
  • Heavy-wall protection for 12–6 AWG wires
  • 3:1 shrink ratio seals from .4 in to .15 in
  • Adhesive lining bonds and waterproofs each connection
  • Cross-linked polyolefin resists abrasion, acids, alkalis and UV
  • Operates from -67 °F to 230 °F with .09 in recovered wall

What it is and who it's for

These 3M heavy-wall heat-shrink caps are 6 in long pieces of cross-linked polyolefin with an inner adhesive lining. They suit technicians and DIYers who need a rugged, moisture-resistant seal on individual wire splices or cable ends in automotive, marine or industrial environments.

The specification that decides fit

The tubing shrinks at a 3:1 ratio from an inside diameter of .4 in down to .15 in, leaving a final wall thickness of .09 in. It is rated for wire sizes from 12 AWG to 6 AWG, so the conductor must fall inside that range for the adhesive to bond and the wall to recover fully.

Installation and common pitfalls

Apply heat evenly until the tubing conforms tightly and adhesive flows; a torch or heat gun works, but open flame can scorch the material if held too close. The most frequent issue is insufficient heat, which leaves the adhesive inactive and the seal vulnerable to water ingress or vibration.

Highlights

  • Heavy-wall protection for 12–6 AWG wires
  • 3:1 shrink ratio seals from .4 in to .15 in
  • Adhesive lining bonds and waterproofs each connection
  • Cross-linked polyolefin resists abrasion, acids, alkalis and UV
  • Operates from -67 °F to 230 °F with .09 in recovered wall

Specifications

Brand3M
Color MappingBlack
MaterialHAWA
TypeIndustrial and Scientific - Other Industrials

Questions about this item

What does the 3:1 shrink ratio mean once the tubing is heated on a wire?

The tubing shrinks to one-third of its original .4 in inner diameter, finishing at .15 in to seal wires from 12 AWG to 6 AWG.

How does the adhesive lining perform at the temperature limits?

The adhesive-lined polyolefin operates continuously from -67 °F to 230 °F, maintaining a moisture-resistant seal across the full range.

What clearance is needed for the .09 in wall thickness after shrinking?

After shrinking, the wall measures .09 in thick, so allow at least that much radial space around the connector for the finished joint.

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