Kapton® 300FN021 – A0 – 0.0762mm | DuPont™Custom pads and gaskets priced instantly and made to order within 24 hours!

Kapton® 300FN021 – A0 – 0.0762mm | DuPont™

Thermally Conductive Substrate Polyimide Film

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  • Easy bonding and sealing
  • Performs reliably across a broad temperature range
  • Long-term performance in challenging environments
  • Superior performance for electrical insulation
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Description

Kapton® 300FN021 is a premium-grade, heat-sealable polyimide film engineered by DuPont. This versatile material combines the exceptional thermal, electrical, and mechanical properties of Kapton® HN with the advanced capabilities of FEP fluorocarbon resin. Its specialized composite construction features a 2.0 mil Kapton® HN core with a 1.0 mil FEP layer, providing reliable heat-sealing performance while maintaining the outstanding properties of the underlying polyimide film.

This high-performance film delivers consistent results for demanding engineering and electrical applications, making Kapton® 300FN021 an excellent choice for applications requiring heat sealing, electrical insulation, chemical resistance, and dependable performance across a wide temperature range.

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Benefits

  • Heat Sealability: The FEP layers enable easy bonding and sealing for precision assemblies.
  • Thermal Stability: Performs reliably across a broad temperature range, maintaining dimensional and physical integrity.
  • Chemical Resistance: Withstands exposure to harsh chemicals, ensuring long-term performance in challenging environments.
  • Versatility: Offers superior performance for electrical insulation, flexible printed circuits, and high-temperature sealed enclosures.

Features

Recommended Uses

  • Kapton® 300FN021 is widely used in electrical insulation for motors and transformers, flexible printed circuits, and heat-sealed enclosures in aerospace, electronics, and industrial sectors.

Table 1 – DuPont™ Kapton® FN Polyimide Film Types

Designation FEP mil (µm) HN mil (µm) FEP mil (µm)
120FN616 0.10 (1.5) 1.00 (25.4) 0.10 (2.5)
150FN019 0.50 (12.7) 1.00 (25.4) –
200FN919 0.50 (12.7) 1.00 (25.4) 0.50 (12.7)
200FN011 – 1.00 (25.4) 1.00 (25.4)
250FN029 – 2.00 (50.8) 0.50 (12.7)
300FN021 – 2.00 (50.8) 1.00 (25.4)
300FN929 0.50 (12.7) 2.00 (50.8) 0.50 (12.7)
400FN022 – 2.00 (50.8) 2.00 (50.8)
500FN131 1.00 (25.4) 3.00 (76.2) 1.00 (25.4)

Table 2 – Mechanical Properties of DuPont™ Kapton® HN polyimide film

Property 0.50<br>(12.7)* 1.00<br>(25.4)* 2.00<br>(50.8)* 3.00<br>(76.2)* 5.00<br>(127)* Method
Tensile Strength, psi (MPa)<br> at
23°C (73°F). Machine Direction<br>
(MD) and Transverse<br>
Direction (TD), min.		 20,000<br>
(138)		 24,000<br>
(165)		 24,000<br>
(165)		 24,000<br>
(165)		 24,000<br>
(165)		 ASTM D-882-91, Method A, using an Instron<br>
Tensite Tester (specimen size: 1/2” x 6” [12.7 mm<br>
x 152 mm]; jaw separation: 4” [102 mm]; jaw<br>
speed: 2”/min [51 mm/min]). Calculate the<br>
average of five specimens based on original<br>
measured thickness.
Elongation, %, MD and TD, min. 35 40 45 50 50 Same as above.
Shrinkage, %, MD and TD at <br>
200°C (392°F), max.		 – 0.3 0.35 0.35 0.35 The percent shrinkage is obtained for either <br>
the MD or TD using the average of three <br>
measurements in either direction before and <br>
after conditioning. Prior to measurement, the <br>
12” x 12” (305 mm x 305 mm) specimen is<br>
conditioned by freely suspending it for 2 hr** <br>
in an oven controlled to 200°C (392°F).
Moisture Absorption, %, max. 4.0 4.0 4.0 4.0 4.0 ASTM D-570-92, using 24-hr immersion at <br>
23°C (73°F). Average of three specimens.

Table 3 – Electrical Properties of DuPont™ Kapton® HN polyimide film

Property 0.50 <br>
(12.7)*		 1.00 <br>
(25.4)*		 2.00<br>
(50.8)*		 3.00<br>
(76.2)*		 5.00<br>
(127)*		 Method
Dielectric Strength, AC V/mil<br>
(kV/mm), min.		 3,000<br>
(118)		 6,000<br>
(236)		 5,000<br>
(197)		 4,500<br>
(177)		 3,000<br>
(118)		 ASTM D-149-97 (Average of ten specimens.) <br>
Flat sheets in air placed between 1/4” (6 mm) <br>
diameter brass electrodes with 1/32” (0.8 <br>
mm) edge radius subjected to 60 cycles AC <br>
voltage at 500 V/sec rate of rise to the<br>
breakdown voltage.
Volume Resistivity, ohm-cm at<br>
200°C (392°F), min.		 10<sup>12</sup> 10<sup>12</sup> 10<sup>12</sup> 10<sup>12</sup> 10<sup>12</sup> ASTM D-257-93
Dielectric Constant at 1 kHz, max. 3.4 3.4 3.4 3.5 3.5 ASTM D-150-94. Use conducting silver paint<br>
electrodes, two-terminal system of<br>
measurement at standard conditions. Results<br>
are based on an average of five tests using<br>
measured thickness of specimens.
Dissipation Factor at 1 kHz, max. 0.0050 0.0036 0.0036 0.0036 0.0036 Same as above.

Table 4 – Dielectric Strength of DuPont™ Kapton® FN polyimide film

Gauge Construction Minimum Breakdown V/mil (kV/mm)
120FN616 4,200 (165)
150FN019 3,700 (146)
200FN919 3,200 (126)
200FN011 3,200 (126)
250FN029 2,750 (108)
300FN021 2,700 (106)
300FN929 2,700 (106)
400FN022 2,200 (87)
500FN131 2,200 (87)

Table 5 – Shrinkage of DuPont™ Kapton® HPP-ST polyimide film

Property 0.50 (12.7)<br>mil (µm) 1.00 (25.4)<br>mil (µm) 2.00 (50.8)<br>mil (µm) 3.00 (76.2)<br>mil (µm) 5.00 (127)<br>mil (µm)
Shrinkage, %, MD and TD at 200°C (392°F), max. 0.10 0.10 0.10 0.10 0.10

Kapton FN Datasheet





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