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Black polyolefin heat-shrink tubing spool, thin wall, 4 ft length, 3:1 shrink ratio

3M

3M SFTW-203-1/8-48-BLACK Heat Shrink Tubing

SKU CH-EH6H-EYF7E

Thin-wall polyolefin heat-shrink tubing with a 3:1 ratio, flame-retardant and acid-resistant, covering 19 to 10 AWG wires in four-foot black lengths

  • 3:1 shrink ratio fits 19 to 10 AWG wires
  • Thin-wall polyolefin shrinks to 0.04 in ID with 0.02 in wall
  • Flame-retardant and acid-alkali resistant for harsh environments
  • Operates from -67 °F to 275 °F with 212 °F minimum shrink temperature
  • 600 V dielectric strength protects electrical connections

3M Heat Shrink Tubing for Wire Insulation

3M SFTW-203-1/8-48-BLACK is thin-wall polyolefin tubing supplied in four-foot black lengths. It fits wire gauges from 19 AWG to 10 AWG and shrinks at a 3:1 ratio to seal connections. The material is very flexible, flame retardant and resists acids and alkalis. It is suited for electricians and technicians insulating splices or terminations.

Shrink Ratio Limits Wire Range Coverage

The 3:1 shrink ratio reduces the inside diameter from 0.12 in to 0.04 in with a 0.02 in wall thickness after shrinking. This range covers 19 AWG to 10 AWG conductors; wires outside this gauge range will not seal reliably. Minimum shrink temperature is 212 Degrees F and the operating range spans -67 Degrees to 275 Degrees F. Dielectric strength is rated at 600 V.

Adhesive-Free Design Requires Mechanical Strain

This tubing has no adhesive lining, so it relies on friction fit and the polyolefin's flexibility to stay in place. It will not bond to the wire or connector surface. Installers needing an environmental seal or vibration-proof bond must use a separate adhesive-lined product or add mechanical strain relief.

How it compares

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Price $49.99
Cheaper than about 78% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand name3M

Questions about this item

How do I know which heat-shrink size matches my wire?

The tubing fits wire from 19 AWG to 10 AWG, shrinks from .12 in to .04 in, and leaves a .02 in wall after shrinking.

What does the 3:1 shrink ratio mean when I apply heat?

The inside diameter reduces to one-third of its original size, so .12 in becomes .04 in, creating a tight seal on the conductor.

What voltage can the polyolefin tubing actually withstand?

Dielectric strength is rated at 600 V, so it insulates low-voltage automotive and control circuits within that limit.

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