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.
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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.