Calculate your spin speed for SU-8 photoresist

Spin speed calculator takes your thickness input, tells you which SU-8 types will work and what RPM to use.

Spin speed calculator takes your thickness input, tells you which SU-8 types will work and what RPM to use.

Dragging an ancient, stained cleanroom notebook around (NO DRINKING COFFEE IN THE LAB!) or constantly digging up the MicroChem SU-8 datasheets to calculate your SU-8 spin speed? Check out our SU-8 Spin Calc.

SU-8 is a thick photoresist often used for making molds for microfluidic devices. Since the photoresist is part of the final structure, its thickness is very important, and thickness is a function of spin speed. It goes approximately as the inverse square root of spin speed, so we can calculate the spin speed for a given thickness using a few known data points. Thickness will depend on a few other variables such as age of your resist bottle (has the solvent evaporated?) so be sure to do a test spin!

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