Spin coating has been used for several decades for the application of thin films. The typical process involves depositing a small puddle of fluid resin onto the center of a substrate and then spinning the substrate at high speed. Centripetal acceleration will cause the resin to spread to, and eventually off, the edge of the substrate leaving a thin film of resin on its surface. Final film thickness and other properties depend on the nature of the resin (Viscosity, dying rate, percent solids, surface tension etc. ) and the parameters chosen for the spinning process.
Holmarc's spin coating device is a dedicated tabletop device to spin coat small substrates up to 100 mm diameter. The spin head actuator is a precision DC servo motor with accurate speed and acceleration control. The substrate can be held by either mechanical clamps or by vacuum (for thinner objects). The spin head is provided with a vacuum chuck for holding light substrates.