Lockheed Martin has been using Clayborn heat tape for 20+ years. It is a versatile thermal solution that is used in many aerospace applications today.
— Matt StoutGarcia
Lockheed Martin, Sunnyvale, CA
Description  Silicone Adhesives (16 series) 
Acrylic Adhesives (28 series) 

• Operating Temperature Range  100ºC to +250ºC  40ºC to +150ºC 
• Outgassing … TML/VCM  1.047% / .322%  1.000% / .100% 
• Adhesion to etched aluminum oz/inch width  25@ +150ºC 450@ 100ºC 
15@ +125ºC 50@ 100ºC 
• Overall Thickness Applied  .025”  .028” 
• Dielectric Strength  600 vdc  600 vdc 
Note: In applications exposed to weather, water, mechanical abuse or solvents, tapes will require additional protection. If there is any potential for moisture to come in contact with the heat tape, we recommend a ground circuit should be installed between the aluminum top surface of the heating tape and the grounded metal heat sink to which it is applied.
1. Determine the length (L) of the heating tape needed to give even distribution of the total wattage (Tp) over the surface of the object to be heated.
2. Determine the amount of power necessary for your application. The total wattage (Tp) required to maintain the object to be heated at the desired temperature can be calculated as follows (based on temperature maintenance only. Does not provide for rapid warmup or heat losses/gains due to fluids in tube):
Flat Surface Heating Tp = P x A x ΔT 
Tube and Pipe Heating Tp = P x L_{tube} x ΔT 

Where: A = Heated Area, square feet ΔT = Temperature rise, ºF above ambient 
Where: L = Length of tube, feet ΔT = Temperature rise, ºF above ambient 



3. Calculate the Ohms / Foot of Tape
E^{2} / Tp x L where:
E = Your operating voltage.
Tp = Total from item 2.
L = Length of tape from item 1.
4. Calculate Watts / Foot of Tape
Tp / L
5. See the data table Below
From the data table select the tape with the approximate ohms/foot as calculated in step “3” and equal or greater maximum watts/foot capacity as calculated in step “4”.
PLEASE REVIEW THE SPECIFICATIONS AND LENGTH / SELECTION OPTIONS BEFORE MAKING YOUR SELECTION
Specify resitance code letter (AK), Silicone or Acrylic (16 or 28), and Number of conductors (1,2,4) i.e., H162, B284. Quantity discounts on 500 or more feet of a single type
Width Conductors  1/6" 1 
1/4" 2 
1/2" 4 

Part Number (Resistance Code) 
ohms per ft.  Max. watts per ft.  ohms per ft. see notes  Max. watts per ft. 
ohms per ft. see notes  Max. watts per ft. 

(4)  (1)  (2)  (4)  (1)  (3)  (2)  (4)  
A16 or 28  1.9  25  .9  3.8  40  .5  1.9  7.6  70 
B16 or 28  3.2  25  1.6  6.4  40  .8  3.2  12.8  70 
C16 or 28  4.0  23  2.0  8.0  35  1.0  4.0  16.0  62 
D16 or 28  4.9  20  2.4  9.8  30  1.2  4.9  19.6  52 
E16 or 28  7.0  25  3.5  14.0  40  1.7  7.0  28.0  70 
F16 or 28  8.8  23  4.4  17.6  35  2.2  8.8  35.2  62 
G16 or 28  10.8  20  5.4  21.6  30  2.7  10.8  43.2  52 
H16 or 28  13.2  20  6.6  26.4  30  3.3  13.2  52.8  52 
J16 or 28  21.3  13  10.6  42.6  20  5.3  21.3  85.2  32 
K16 or 28  26.8  10  13.4  53.6  16  6.7  26.8  107.2  25 
(1) Ohms/foot with all conductors in parallel connection.
(2) Ohms/foot with all conductors in series connection.
(3) Ohms/foot with conductors in parallel/series connection.
(4) Maximum wattage per lineal foot when applied to a metal heat sink at room temperature. Reduce these ratings linearly to zero watts output at 500ºF. Use of Clayborn Terminals is encouraged to insure thermal grounding of Heating Tape along its entire length (see Terminal Literature >) Adhesion to heat sink along entire length is important to prevent burnout when tape is used near maximum wattage rating.