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The coating of small parts (i.e. bulk material) often takes place in a dip-​spin process. In this process, the coating is applied to the parts in a basket or a barrel.

The quantity of parts loaded into the basket depends upon the shape and bulk density of the component. The basket is then immersed in the coating (i.e. in a dip tank) where the paint wets the entire surface of the parts. While immersed in the coating, the basket is slowly rotated which assists in the elimination of air-pockets and improves coverage (i.e. wetting). After the dipping process, the basket is removed from the dip-tank and rotated or centrifuged, so that the coated parts are thrown against the outer wall of the basket. Excess coating is removed from the parts due to the centrifugal force and escapes through small holes in the basket back into the dip tank. The process of dip-​spinning is influenced by several parameters. The most important are:

  • immersion time
  • basket size
  • spin speed
  • spin time
  • load weight
  • viscosity of the paint.
  • There are also other parameters that affect this process. These are dependent upon the coating equipment, such as tilting the spinner unit and / or directional change, which can lead to an improvement in quality.


Schematic representation of a dip-spin coating machine.

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Technical terms cannot always be avoided. As corrosion experts, we not only want to give you comprehensive advice, we are also interested in making you a corrosion expert yourself.

The variety around the topic of corrosion and corrosion protection is also in our glossary at home: explanations from A as in Adhesion to T as in Thread tolerance. Have fun clicking through!