Design Engineering Dei Heat Shrink Tubing
Representative Photo, actual item may vary
Design Engineering DEI 10836 High-Temp 3:1 Heat Shrink Tubing Kit - 9mm 12mm 18mm 24mm
Design Engineering DEI 10810 Hi-Temp Spark Plug Wire Boot Shrink Tubes Black 18mm x 1.5in
Design Engineering DEI 10858 19mm x 2ft High-Temp Heat Shrink Tubing with Adhesive
Design Engineering DEI 10820 Spark Plug Wire Boot Heat Shrink Tubes 18mm x 1.5" Red (25-Pack)
DEI Hi-Temp Heat Shrink Tubing: Military-Grade Wire Protection for Performance Applications
When it comes to protecting wiring in high-heat environments, few brands bring the same level of engineering credibility as Design Engineering Inc. (DEI). Heat shrink tubing is one of those unsung heroes of any wiring job — and DEI approaches it with the same performance-first philosophy that has defined the brand since its founding in 1995.
DEI's heat shrink tubing lineup is purpose-built for the demanding conditions found under the hood, in the engine bay, and throughout motorsports and marine electrical systems. The flagship Hi-Temp Shrink Tubing series is a professional-grade, flexible polyolefin tubing rated to meet the functional material properties of Military Spec DTL-23053/5C — the same standard used in defense and aerospace applications. That's a level of quality assurance most off-the-shelf heat shrink simply cannot match.
What Sets DEI Heat Shrink Tubing Apart
The defining feature of DEI's heat shrink tubing is the 3:1 shrink ratio. Standard heat shrink products typically offer a 2:1 ratio, but DEI's tubing shrinks down to 33% of its original expanded diameter, allowing a single piece of tubing to accommodate a wider range of wire and connector sizes before forming a snug, form-fitting seal. Because the tubing is pre-expanded, it slides easily over connectors and wire ends, and shrinks down without any reduction in tube length.
DEI also offers a Heat Shrink Tubing with Adhesive variant — a flame-retardant polyolefin sleeve lined with a thick-wall modified adhesive that melts and flows when heat is applied, fully encapsulating components to create a watertight seal. This makes it ideal for marine applications, underhood environments exposed to moisture, or any wiring that sees repeated thermal cycling.
Across the lineup, DEI heat shrink tubing provides:
- Excellent electrical insulation to prevent shorts and arcing
- Protection from dust, dirt, solvents, and foreign material in harsh underhood conditions
- Strain relief at connection points to reduce fatigue and breakage
- Flame-retardant construction for added safety near heat sources
Built for Automotive, Marine, and Powersports
DEI's heat shrink tubing is part of a broader tradition of thermal protection innovation. The brand has spent decades solving heat management challenges for everyone from weekend garage builders to professional race teams and military contractors. Whether you're splicing wires on a build, protecting terminals on a marine bilge pump, or cleaning up a powersports harness, DEI's tubing brings the same engineering discipline to the smallest detail of a wiring job.
Explore the full range of Design Engineering DEI products or browse the complete selection of heat shrink tubing to find the right size and style for your application.