Raychem ATUM Tubing 3:1

Raychem ATUM 3:1 Adhesive-Lined Heat Shrink Tubing for Motorsport Harness Sealing

Raychem ATUM 3:1 is the military and aerospace benchmark adhesive-lined cross-linked polyolefin heat shrink tubing for professional motorsport, aerospace, and defence wiring applications. The 3:1 shrink ratio provides excellent diameter accommodation for connector backshell entries and harness bundle sealing, making ATUM the preferred product at connector backshell entries, harness breakout points, and any location where a large pre-shrink diameter must shrink down to seal around a much smaller finished harness diameter.

Raychem ATUM — The Professional Motorsport Benchmark

Raychem (TE Connectivity) ATUM was developed for military and aerospace harness sealing where environmental performance, dimensional consistency, and adhesive flow reliability are verified to specification. In professional motorsport harness building, ATUM is specified by name by factory racing teams and top-level harness builders because its shrink ratio, adhesive performance, and temperature resistance are verified to tighter tolerances than generic alternatives. The cross-linked polyolefin outer wall provides continuous temperature resistance of 135°C and resistance to motorsport fluids including fuel, oil, and coolant.

Available from Arctic Performance Parts

Arctic Performance Parts stocks Raychem ATUM in both 3:1 and 4:1 shrink ratios, across all key motorsport diameters, in 6-inch piece packs and full stick lengths. Supporting professional motorsport harness builders across Norway, Sweden, and Denmark. Lead time 1–2 weeks for quantities beyond current stock.