ATUM
High expansion ratio, adhesive-lined
heat-shrinkable tubing
ATUM tubing is radiation-crosslinked,
heat-shrinkable, and adhesive-lined to
provide environmental sealing in a wide
variety of electrical applications. The
product is typically used to seal
connector backshells and cable
breakouts and to repair damaged cable.
ATUM has an internal adhesive coating
that, when heated, melts and flows to
form a positive environmental seal.
The coating adheres to the outer
tubing and the surface below, creating
an excellent barrier to moisture
penetration. The adhesive bonds to a
wide variety of plastics, rubbers, and
metals, including PVC, polyethylene,
rubber, and aluminum.
Because the tubing and adhesive
are flexible, the moisture seal
withstands bending of the substrate.
This flexibility makes ATUM tubing
ideal for cable repair.
ATUM tubing is available with expansion
ratios of both 3:1 and 4:1. These high
expansion ratios make it possible to
repair cables without removing
connectors. Just a few sizes of ATUM
tubing cover a wide range of substrates.
ATUM is UL-recognized at 110°C, 600 V.
Temperature rating
Full recovery temperature: 125°C
Continuous operating temperature: –55°C to 110°C
Specifications*
Type Raychem Military UL
ATUM RW-2063 (Black only) AMS-DTL-23053/4, Cl. 3 E85381**
RK-6024 (Clear and colors)
*When ordering, always specify latest issue.
**Except sizes 3/1 and 4/1.
Dimensions (millimeters/inches)
Inside diameter Recovered wall thickness***
D (min.) d (max.) W W1
Expanded Recovered Total (nom.)
Size as supplied after heating wall Meltable wall
3:1
3/1 3 0.118 1 0.039 1.00 ± 0.30 0.039 ± 0.012 0.50 0.020
4.5/1.5 4.5 0.177 1.5 0.059 1.00 ± 0.30 0.039 ± 0.012 0.50 0.020
6/2 6 0.236 2 0.079 1.00 ± 0.30 0.039 ± 0.012 0.50 0.020
9/3 9 0.354 3 0.118 1.40 ± 0.28 0.055 ± 0.010 0.61 0.024
12/4 12 0.472 4 0.157 1.78 ± 0.38 0.070 ± 0.015 0.76 0.030
19/6 19 0.748 6 0.236 2.25 ± 0.55 0.088 ± 0.020 0.76 0.030
24/8 24 0.940 8 0.315 2.54 ± 0.55 0.100 ± 0.020 1.00 0.040
40/13 40 1.570 13 0.512 2.54 ± 0.55 0.100 ± 0.020 1.00 0.040
***Wall thickness will be less if tubing recovery is restricted during shrinkage.
Inside diameter Recovered wall thickness***
D (min.) d (max.) W W1
Expanded Recovered Total (nom.)
Size as supplied after heating wall Meltable wall
4:1
4/1 4 0.157 1 0.039 1.00 ± 0.28 0.039 ± 0.010 0.50 0.020
8/2 8 0.315 2 0.079 1.00 ± 0.28 0.039 ± 0.010 0.50 0.020
12/3 12 0.472 3 0.118 1.40 ± 0.28 0.055 ± 0.010 0.61 0.024
16/4 16 0.630 4 0.157 1.78 ± 0.38 0.070 ± 0.015 0.76 0.030
24/6 24 0.945 6 0.236 2.25 ± 0.55 0.088 ± 0.020 0.76 0.030
32/8 32 1.260 8 0.315 2.54 ± 0.55 0.100 ± 0.020 1.00 0.040
52/13 52 2.050 13 0.512 2.54 ± 0.55 0.100 ± 0.020 1.00 0.040
Ordering information
Colors Standard Black
Nonstandard Clear (non-flame retardant jacket); other colors available on request.
Size selection Always order the largest size that will shrink snugly over the component being covered. Some special order sizes are available.
Standard packaging 4-foot lengths
Ordering description Specify product name, size, and color; for example, ATUM 6/2-0 (0=Black).
