3M
3M SFTW-203-1/2-48-BLACK Heat Shrink Tube Thin Wall 3:1 Ratio Black 4 ft
Thin-wall polyolefin tubing shrinks 3:1 to 0.16 in. for 6–1 AWG wires, resists acid and alkali, and withstands –67 °F to 275 °F
- Fits 6 AWG to 1 AWG wire with 0.47 in pre-shrink diameter
- Shrinks to 0.16 in inside diameter at 3:1 ratio for tight seal
- Thin 0.03 in wall stays very flexible after shrinking
- Withstands -67 °F to 275 °F and resists acid and alkali
- Flame-retardant polyolefin rated to 600 V dielectric strength
Thin-wall heat-shrink tubing
3M SFTW-203-1/2-48-BLACK is a thin-wall polyolefin tube with a 3:1 shrink ratio. It fits wire sizes from 6 AWG to 1 AWG and comes in a four-foot black length. The tubing is very flexible and flame-retardant without an adhesive lining. It suits general electrical insulation and strain relief.
Sustained thermal and chemical resistance
The material withstands continuous temperatures from -67 to 275 degrees F and resists acid and alkali exposure. Minimum shrink temperature is 212 degrees F, and the recovered wall measures .03 inches thick. Dielectric strength is rated at 600 V for reliable insulation under load. Performance remains stable across the full temperature range.
Replaces larger-ratio or adhesive-lined tubing
This product upgrades from 2:1 ratio tubing when a wider range of wire diameters must be covered with one size. It is not for buyers who need an adhesive seal or a heavier wall for abrasion protection. The 3:1 ratio reduces inventory by covering 6 AWG through 1 AWG with a single SKU.
Highlights
- Fits 6 AWG to 1 AWG wire with 0.47 in pre-shrink diameter
- Shrinks to 0.16 in inside diameter at 3:1 ratio for tight seal
- Thin 0.03 in wall stays very flexible after shrinking
- Withstands -67 °F to 275 °F and resists acid and alkali
- Flame-retardant polyolefin rated to 600 V dielectric strength
Specifications
| Brand | 3M |
|---|
Questions about this item
How much heat does the 3M SFTW-203 tubing need to reach its minimum shrink temperature of 212 degrees F?
The minimum shrink temperature is 212 degrees F. A standard heat gun on a low setting will reach this quickly; the thin wall and 3:1 ratio mean the tube recovers fully in seconds without overheating the wire underneath.
What wire gauges can I use with the 0.47 in inside diameter before shrinking?
The tubing is rated for use with wire sizes 6 AWG to 1 AWG. The 0.47 in expanded I.D. slides over the insulation easily, then shrinks to 0.16 in for a tight seal.
Will the 600 V dielectric strength protect splices on older 12 V automotive circuits?
Yes. The 600 V dielectric strength far exceeds 12 V system requirements. The polyolefin material is acid and alkali resistant and flame retardant, so it withstands harsh under-hood conditions.
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