$335.11$560.44 Before Tax

GMT-421 is a 4:1, flame retardant, polyolefin heat shrinkable tube with excellent electrical, physical, and chemical resistant properties.

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GMT-421 is a high shrink ratio; flame retardant, heat resistant, heat shrinkable polyolefin tube. It has excellent electrical, physical, and chemical properties that meet or exceed industry standards. Conforms well to highly variable substrates. There are no signs of denigration when exposed to solvents, chemicals, and aviation fuels.

Key Features

  • MIL-DT- 23052/5C
  • RoHS
  • E306685
  • Operating Temperature: -55 ° to 135 ° Celsius
  • Shrink Temperature: Start at 70° C; Shrinkage Complete 120° C
  • Shrink Ratio: 4 to 1
  • Colors: Black, other Colors Available Upon Request
  • Resistance to Water, Fungus, UV Light
  • Flammability: Self-Extinguishing


  • Ideal for Harness Repair
  • Pass Over Large Dimension, then Shrink Down to Small Size
  • Covers Irregular Shapes & Connectors