Powder Coating
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Design and maintenance of the fixtures that hold the parts as they

travel through the coating system is frequently a source of quality defects.

In order to provide the highest possible level of efficiency and

quality a rack should be thought of as a tool.

powder coating hooks

Issues to Consider in the Design & Care of Parts Racks

  • Racks will be used in an industrial environment; make them sturdy.
  • If the parts can swing on the rack, they may hit each other n the oven
    • and cause a blemish in the coating.
  • Tubing used for rack frames can trap water in the washer;
    • if it boils out in the cure oven it will stain the coating.
  • For electrostatic application, contact points must always be clean
    • to provide good ground.
  • Coating build-up on racks can crack and create dirt defects.
  • Coating build-up on contact points will interfere with electrostatic
    • attraction.

To maintain a low level of defects on the coated parts, the tooling

must have a low level of defects. Good original design and good rack maintenance will contribute to yield.

Electrostatic contact points should be designed to make sure they provide a certain ground to the parts.

Missing contacts should be replaced and bent frames straightened so that the work package is consistent in relationship to the application equipment.

Heavy build-up on racks should be avoided by a planned

schedule for stripping racks and by making sure that there are enough racks to manage production while racks are in the strip cycle.


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Powder Coaters Manual

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abrasive blasting   adhesion problems  caps and plugs

chemical cleaning  cure ovens  defects  fluidized bed

infrared oven  masking  outgassing  powder formulations

pretreatment  quality  tape  powder selection

powder vs. liquid  racking   spray booth  spray gun  substrates  hi-temp tapes  types of powder  troubleshooting

June 14, 2012