When single-wall tubing is not enough
Outdoor lighting, EV chargers, rail signaling, and underbody automotive splices face rain, condensation, and road splash. dual wall heat shrink tubing adds an inner hot-melt adhesive that flows during shrink, filling voids around crimps and solder joints. It sits in SUNBOW’s heat shrink tubing portfolio as the go-to sealing grade when IP-style protection is required without a separate molded boot.
How adhesive-lined dual wall works on the line
- Outer polyolefin recovers tightly for mechanical protection
- Inner adhesive melts, bonds to jacket and connector boots
- Proper heat profile avoids scorching yet fully activates glue
- Inspect fillet of adhesive at both ends as a quality gate
SBD-DWHF dual wall heat shrink tube suits general dual-wall sealing tasks, while SBD-DWG adhesive-lined heat shrinkable tube is frequently selected where soft recovery and strong adhesive fill are prioritized. Match expanded ID to the largest connector lip, not only to wire OD.
Design notes that prevent field failures
Keep splice geometry smooth before tubing; sharp solder peaks pierce thin recovered walls. Validate adhesive compatibility with PVC, XLPE, or TPE jackets used on your cable. For program trials, ask for waterproofing samples and review similar field applications. Correctly applied dual-wall heat shrink tubing turns a vulnerable splice into a sealed, serviceable joint.
SUNBOW supplies fiberglass sleeving, heat shrink tubing, fluoropolymer tubes, and cable accessories for electronics, automotive, new-energy, and industrial programs. Pairing the right linked product family with early process validation shortens the path from prototype to volume and reduces insulation-related downtime. Share operating temperature, cable OD, and certification needs when you inquire for samples or datasheets.
