Kapton®/ Nomex® end caps, non-shrinking, cl. H (180 °C)

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End caps, non-shrinking, for insulation in varnish-impregnated electric motors of temperature class H.

  • Available with inner diameters from 2.00 mm and with wall thicknesses from 0.0350
  • Five-layer composite of DuPont™ Nomex® 411 and Kapton® results in high dielectric strength and high mechanical stability.
  • The materials are UL
  • Suitable for use in temperature class H up to 180 °C.

The multi-layer, non-shrink end caps made of DuPont™ Kapton® film and Nomex® are designed for use in paint-soaked electric motors. Two layers of Nomex® type 411 form a composite with a protective layer of three layers of Kapton®. The non-calendered inner insulation takes on the properties of the impregnating varnish during impregnation and thus increases the dielectric strength and mechanical stability of the end cap. The penetrated impregnating varnish also secures the end cap in position. The end caps retain their mechanical and electrical properties even at high temperatures. The ultrasonic welding of the end caps is chemically resistant and contributes to the robustness of the product. These non-shrink end caps are very suitable for use in series production where easy processing is required. They are mainly used in electric motors, aviation and the automotive industry.

Art.-Nr.

Technical data

Properties: DuPont™ Kapton® HN

 

Electrical properties
Property Typical value (25 µm) Test condition Test method
-195 °C 25 °C 200 °C
short-term
Dielectric strength [kV] 10,8 7,0 5,6 60 Hz ASTM D 149-64
Dielectric constant – 3,5 3,0 1000 Hz ASTM D 150-64T
Loss factor – 3 2 1000 Hz ASTM D 150-64T
Contact resistance [Ω/m] – 1016 1012 – ASTM D 257-61
Surface resistance [Ω per square] – 1016 – 50% Relative humidity ASTM D 257-61
Corona discharge voltage [V] – 465 – 50% Relative humidity ASTM D 1868-61T
Insulation resistance [MW/F] – 100000 – measured with
capacitor 0.05 µF wound from 25 µm H foil

 

Physical properties
Property Typical value Film 25 µm for Test method
-195°C 25°C 200°C
Tear resistance (LR) [kg/m2] [MPa] 2450

241

 1750

172

 1200

117

 ASTM D 882-64T
Yield strength (LR) [kg/m2] [MPa – 700

69

 420

41

 ASTM D 882-64T
Tension for 5% elongation (LR) [kg/m2] [MPa – 910

90

 600

59

 ASTM D 882-64T
Yield point ( LR) [%] 2 70 90 ASTM D 882-64T
Tension module (LR) [kg/cm2]

[MPa]

 35‘800

3‘500

 30‘000

2‘950

 18‘200

1‘800

 ASTM D 882-64T
Impact resistance (D) [kg/cm] [N/m] – 6

0,6

 – DuPont™ Pneumatic Impact Test
Folding resistance (MIT) Cycles – 10’000 – ASTM D 2176-63T
Tear resistance (Elmendorf) – 878 – ASTM D 1922-61T
Tear resistance (Graves) [g]
[N]		 – 510

5

 – ASTM D 1004-61
Burst test (Mullen) [kg/cm2] [kPa] – 5,25

517

 – ASTM D 774-63T
Density [Mg/m2] 1,42 – ASTM D 1505-63T
Coefficient of sliding friction (film to film) – 0,42 – ASTM D 1894-63
Refractive index (Becke Line) – 1,78 – Encyclopaedic Dictionary of Physics, Volume 1
Grammage [m2/kg] – 28 – Calculation

 

Thermal properties
Property Typical value for film 25 µm Test condition Test method
Melting point none
Zero Strength Temperature*) 815°C 1.4 kg/cm2 (138 kPa) Load during 5 s Hot Bar (DuPont™ Test)

Softening temperature

 435°C

525°C

 25 µm

50-125 µm

 Weighted Probe on Heated Film (DuPont™ Test)
Thermal expansion coefficient 2.0 x 10-5/K -14°C to 38°C ASTM D 696-44
Thermal conductivity coefficient [cal)] cm] 3.72×10-4 [cm2][s][°C] [0 .,156W/m/K] 25 °C Model TC-1 000 Twin Heatmeter Comparative Tester
3.89×10-4 ([cm2][s][°C] [0,163W/m/K] 75 °C
4.26×10-4 [cm2][s][°C] [0,178W/m/K] 200 °C
Flammability self-extinguishing –
heat sealable no –
Heat capacity 0.261 cal/g/°C (1092 J/kg/K) 40 °C Differential calorimeter

 

*) Temperature at which the film can withstand a tension of 0.014 MPas (20psi) for 5 s.

 

Inner laminate: DuPont™ Nomex® Grade 411

Electrical properties
Properties of the film Film thickness Test condition Test method
0,130mm 0,180mm
Dielectric strength [kV/mm] 12 12 AC steep ascent ASTM D 149
Dielectric constant 1,3 1,3 1000 Hz ASTM D 150
Loss factor 0,005 0,005 1000 Hz ASTM D 150

Physical properties
Properties of the film Typical value Test condition Test method
Tear resistance
MD

TD

 [N/cm] 17 28 ASTM D 828-60
9 17 ASTM D 828-60
Yield point
MD

TD

 [%] 3,5 3,5 ASTM D 828-60
4.,8 5 ASTM D 828-60

 

Item number:

IENKNdddd/wwww/llll Example: IENKN0100/005/0050 IENKN = master number 0100 = 1.00 mm inner diameter 005 = 0.05 mm wall thickness 0050 = 50 mm inner length (without protrusion)

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