The Properties and Applications of UPILEX-RN Polyimide Films

UBE’s UPILEX polyimide films (Figure 1) exhibit a superior chemical resistance when compared to other polyimide materials. They have a UL-94 flammability rating of VTM-0 and have no melting point. These unique properties make them suitable for areas demanding high tensile strength and temperatures.

One such product from UBE is the UPILEX-RN polyimide film, which is the material of choice in applications requiring high levels of elongation and superior heat resistance of temperatures up to 430°C and higher.

UBE’s UPILEX polyimide films

Figure 1. UBE’s UPILEX polyimide films

Properties of UPILEX-RN Polyimide Films

The UPILEX®-RN polyimide film has superior mechanical properties when compared to other products on the market. Its tensile strength is 402MPa and elongation is 172%. The dimensional stability of the UPILEX®-RN polyimide film is much better than that of other currently available products.

In addition, the polyimide film has very small hygroscopic expansion, heat shrinkage, and linear expansion. It shows good resistance to most of the chemicals, including alkali and inorganic acid solutions, and it is insoluble in all types of organic solvents. There is no change in the dimensional stability and physical properties of UPILEX-RN when subjected to chemical exposure.

The superior mechanical properties of the UPILEX-RN polyimide film are listed below:

  • Excellent elongation properties
  • Remarkable chemical resistance
  • Low heat shrinkage
  • Very low out-gassing especially for water
  • Very high tear strength

Table 1 summarizes the typical properties of the UPILEX-RN polyimide film.

Table 1. Properties of UPILEX-RN

Typical Properties Unit UPILEX-RN Test Method
25µm 50µm 75µm 125µm
Tensile Strength MPa 402 373 379 349 ASTM D882
Elongation % 172 142 153 138 ASTM D882
Tensile Modulus MPa 3932 3491 3716 3658 ASTM D882
Initial Tear Strength [Graves] N 344 647 929 1391 ASTM D1004
Heat shrinkage % 0.03 0.03 0.06 0.09 200°C, 2hr JIS C2318
CTE (anneal, 50-200°C) ppm /°K 43 43 43 45 ASTMD1505
Glass Transition Temperature °C >285
Flammability UL94 V-0 UL94 File No.48133

Applications

The properties of the UPILEX-RN polyimide film make it the material of choice in a variety of applications, including:

  • Speaker cone
  • Electrical isolation
  • Heating film
  • Flexible printed circuits
  • Separation film
  • Release film
  • Vacuum bagging film

This information has been sourced, reviewed and adapted from materials provided by UBE Group.

For more information on this source, please visit UBE Group.

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