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[wg02_1]
Humidity and temperature fluctuations in your cleanroom are two very influential factors affecting the dimensional stability of your film, therefore directly affecting the performance of your film.
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[wg03_1]
Use this tool to determine film size change effects due to humidity and temperature changes in in order to determine the appropriate course of action:
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| You may need to select a PCB film that has lower humidity coefficient for size change (see KODAK ACCUMAX Photoplotter Film ARD7). A low humidity coefficient film will immediately deliver a reduction in size change variability without the need for investment in new AC or humidity controls. |
| 2.
| You may want to consider upgrades to the environmental controls in your cleanroom. |
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After launching the application, you will be asked to enter the following:
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| Critical Film Length of Interest (e.g. diagonal): A value up to 9999 millimeters |
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| Change in relative humidity: range: -10 to +10% |
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| Change in temperature: range -10 to +10 degrees Centigrade |
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| Humidity coefficient of film being measured: range: 0.0009% - 0.0015% change per % change in RH |
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| Temperature coefficient of polyester: A constant for all polyester films: 0.0018% per degree Centigrade. |
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| The Calculator will show you the size change in microns |
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[wg04_1]
* JavaScript must be enabled to use the Size Change Calculator Application.
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