Kapton tape, developed by DuPont, is a polymide general purpose film with silicone adhesive. It shows excellent dielectric qualities, superior resistance in the face of extreme temperatures, and excellent solvent resistance.

Kapton is regularly used as an insulator in ultra-high vacuum environments due to its low outgassing rate, which makes it ideal for aeronautical, and space applications. Due to its large range of temperature stability, and its electrical isolation ability, Kapton tape is usually used in electronic manufacturing as an insulation and protection layer on electrostatic sensitive and fragile components.



Technical Data

Product Specs

Physical Properties of Kapton Tape at 73°F (23°C )
PropertyUnit1 mil 25μm2 mil 50μm3 mil 75μm5 mil 125μmTest Method
Ultimate Tensile Strengthpsi (MPa)
at 23°C, (73°F)33,500(231)33,500(231)33,500(231)33,500(231)ASTM D-882-91, Method A*
at 200°C (392°F)20,000(139)20,000(139)20,000(139)20,000(139)
Ultimate Elongation%
at 23°C, (73°F)72828282ASTM D-882-91, Method A
at 200°C (392°F)83838383
Tensile Modulus at 23°C, (73°F)psi (GPa)
at 23°C, (73°F)370,000 (2.5)370,000 (2.5)370,000 (2.5)370,000 (2.5)ASTM D-882-91, Method A
at 200°C (392°F)290,000 (2.0)290,000 (2.0)290,000 (2.0)290,000 (2.0)
Densityg/cc1.421.421.421.42ASTM D-1505-90
MIT Folding Endurancecycles2850005500060005000ASTM D-2176-89
Tear Strength-propagating (Elmendorf)N (lbf )0.07 (0.02)0.21 (0.02)0.38 (0.02)0.58 (0.02)ASTM D-1922-89
Tear Strength, Initial (Graves)N (lbf )7.2 (1.6)16.3 (1.6)26.3 (1.6)46.9 (1.6)ASTM D-1004-90
Yield Point at 3%MPa (psi)
at 23°C, (73°F)69 (10,000)69 (10,000)69 (10,000)69 (10,000)ASTM D-882-91
at 200°C (392°F)41 (6,000)41 (6,000)41 (6,000)41 (6,000)
Stress to produce 5%

MPa (psi)
at 23°C, (73°F)90 (13,000)90 (13,000)90 (13,000)90 (13,000)ASTM D-882-92
at 200°C (392°F)61 (9,000)61 (9,000)61 (9,000)61 (9,000)
Impact Strength at 23°C, (73°F)N·cm·(ft lb)78 (0.58)78 (0.58)78 (0.58)78 (0.58)DuPont Pneumatic Impact Test
Coefficient of Friction, kinetic (film-to-film)0.480.480.480.48ASTM D-1894-90
Coefficient of Friction, static (film-to-film)0.630.630.630.63ASTM D-1894-90
Refractive Index (sodium D line) D-542-90
Poisson’s Ratio0.340.340.340.34Avg. three samples, elongated at 5, 7, 10%
Low temperature flex lifepasspasspasspassIPC-TM-650, Method 2.6.18
*Specimen size 25 x 150 mm (1.6 in); jaw separation 100 mm (4 in), jaw speed, 50mm/min (2 in/min). Ultimate refers to the tensile strength and elongation measured at break.
Thermal Properties of DuPont™ Kapton® HN Film
Thermal PropertyTypical ValueTest ConditionTest Method
Melting PointNoneNoneASTM E-794-85 (1989)
Thermal Coefficient of Linear Expansion20 ppm/°C-14 to 38°CASTM D-696-91
(11 ppm/°F)(7 to 100°F)
Coefficient of Thermal Conductivity, W/m·K0.12296KASTM F-433-77 (1987)
       cal        cm·sec·°C2.87 x 10423°C
Specific Heat, J/g•K (cal/g·°C)1.09 (0.261)Differential calorimetry
Heat Sealabilitynot heat sealable
Solder FloatpassIPC-TM-650 Method 2.4.13A
Smoke GenerationDm=<1NBS smoke chamberNFPA-258
Shrinkage, %0.17IPC-TM-650 Method 2.2.4A; ASTM D-5214-91
30 min at 150°C 120 min at 400°C1.25
Limiting Oxygen Index, %37–45ASTM D-2863-87
Glass Transition Temperature (Tg)A second order transition occurs in Kapton® between 360°C (680°F) and 410°C (770°F) and is assumed to be the glass transition temperature. Different measurement techniques produce different results within the above temperature range.
Typical Electrical Properties of DuPont™ Kapton® HN Film at 23°C (73°F), 50% RH
Property Film GageTypical ValueTest ConditionTest Method
Dielectric StrengthV/m kV/mm
25 μm (1 mil)30360 Hz

1/4 in electrodes 500 V/sec rise
ASTM D-149-91
50 μm (2 mil)240
75 μm (3 mil)205
125 μm (5 mil)154
Dielectric Constant
25 μm (1 mil)3.41 kHzASTM D-150-92
50 μm (2 mil)3.4
75 μm (3 mil)3.5
125 μm (5 mil)3.5
Dissipation Factor
25 μm (1 mil)0.00181 kHzASTM D-150-92
50 μm (2 mil)0.002
75 μm (3 mil)0.002
125 μm (5 mil)0.0026
Volume Resistivity
25 μm (1 mil)cm 1.5 x 1017ASTM D-257-91
50 μm (2 mil)cm 1.5 x 1017
75 μm (3 mil)cm 1.4 x 1017
125 μm (5 mil)cm 1.0 x 1017
Temperature Range, °C, (°F)ppm/°C
30–100 (86–212)17
100–200 (212–392)32
200–300 (392–572)40
300–400 (572–752)44
30–400 (86–752)34