The shrinkage ratio of a heat shrink tube refers to the ratio of its inner diameter before shrinkage to its inner diameter after shrinkage. Common shrinkage ratios include 2:1, 3:1, 4:1, and even higher. The following is a detailed description:
2:1 shrinkage ratio
This is the most common shrinkage ratio. For example, a 1kv heat shrink tube of Φ40mm can shrink to Φ20mm after full shrinkage. This ratio is usually used for ordinary thin-walled heat shrink tubes.
3:1 shrinkage ratio
This ratio is common in double-wall heat shrink tubes with glue. For example, a Φ60mm heat shrink tube can shrink to Φ20mm after full shrinkage.
4:1 and higher ratios
Some heat shrink tubes made of special materials (such as PE heat shrink tubes) may have a shrinkage ratio of 4:1, 6:1 or even higher, which is suitable for a wider range of scenarios.
