It is possible to create a 100-um thick polyimide layer through spin coating. The thickness uniformity of the polyimide film is determined by both spinning and precure process

1

. Here are some parameters to consider when making a polyimide film with a thickness of more than 100 um:

• Use higher spin speeds2
• Mount the substrate on a thick carrier plate before spin coating3
• Coating even at 1000 rpm ensures uniform coating2
• The spin coating thickness of PI-2545 ranges from 1.5 to 3 microns when fully cured at a spin speed range of between 5000 to 2000 rpms4
• The thickness of the composite was dependent on the spin speed and viscosity of the liquid, which would change due to the concentration of5

The viscosity and spin speed of the polyimide liquid will depend on the specific type of polyimide being used. However, the flow of the liquid film is a balance between viscous and centrifugal forces. In other words, if the spinning speed is too low, the polyimide will not spread evenly, and if the spinning speed is too high, the polyimide will be thrown off the substrate

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Ubaid Ur Rahman Qureshi This is a very thick polyimide film, as I guess you know. Typically spin coating will produce films up to several hundreds of nanometers thick (after heat treatment). Is there any reason why you can't use polyimide film directly? For example:

http://www.lookpolymers.com/polymer_DuPont-Kapton-100EN-Polyimide-Film-25-Micron-Thickness.php

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