About Duct Connections
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About Heat-Shrink Tubing
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Tapered Heat-Shrink Tubing
- Material: Polyolefin Plastic
- Shrink Ratio: See Table
- Dielectric Strength: 200 V/mil
- Shrink Temperature: 250° F
- Temperature Range: -65° to 275° F
A different shrink ratio on each end allows this tubing to fit over cable assemblies and wire harnesses with large connections, or around connectors with a 90° elbow. An adhesive lining melts when the tubing is heated and bonds to the underlying surface, creating a water-resistant seal. The tubing length listed is after shrinking; the length before shrinking is 20-25% shorter.
Lipped tubing has a ridge on the inside of one opening for better retention than non-lipped tubing. It’s often used with grooved adapters—upon shrinking, the lip grips onto the groove.
Dielectric strength is the maximum voltage a material can handle before it starts to breakdown.
Tapered End | Non-Tapered End | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Style | ID Before Shrinking | Min. ID After Shrinking | Shrink Ratio | ID Before Shrinking | Min. ID After Shrinking | Shrink Ratio | Min. Wall Thick. After Shrinking | Color | End Style | Lg. | Each | |
| D | 1.25" | 0.28" | 4.5:1 | 1.25" | 0.75" | 1.7:1 | 0.09" | Black | Lipped | 1.4" | 0000000 | 000000 |
| D | 1.25" | 0.28" | 4.5:1 | 1.25" | 0.75" | 1.7:1 | 0.09" | Black | Non Lipped | 1.4" | 0000000 | 00000 |
| D | 1.5" | 0.33" | 4.5:1 | 1.5" | 0.75" | 2:1 | 0.1" | Black | Lipped | 1.7" | 0000000 | 00000 |
| D | 1.5" | 0.33" | 4.5:1 | 1.5" | 0.75" | 2:1 | 0.1" | Black | Non Lipped | 1.7" | 0000000 | 00000 |
| D | 1.75" | 0.38" | 4.6:1 | 1.75" | 1.1" | 1.6:1 | 0.13" | Black | Lipped | 2.1" | 0000000 | 00000 |
| D | 1.75" | 0.38" | 4.6:1 | 1.75" | 1.1" | 1.6:1 | 0.13" | Black | Non Lipped | 2.1" | 0000000 | 00000 |
| D | 2" | 0.62" | 3.2:1 | 2" | 1.6" | 1.3:1 | 0.13" | Black | Non Lipped | 3" | 0000000 | 00000 |
| E | 3" | 0.86" | 3.5:1 | 3" | 1.41" | 2.1:1 | 0.18" | Black | Non Lipped | 5" | 0000000 | 000000 |
Standard Duct and Fittings
No need for clamps or connectors—duct and fittings press-fit together. Male ends are crimped or tapered, making them slightly smaller than a female end for simple assembly.
Galvanized steel has good corrosion resistance.
Oval Duct and Fittings
At about half the height, this oval duct fits in tighter spaces than round and rectangular duct. Duct and fittings press-fit together.
