Masking for Powder Coating-
Caps and Plugs                                       
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Many different types of caps and plugs are used to cover threaded

studs, bosses, and holes. The cost is reasonable and they can be reused or left in place. They usually seal the masked area very effectively and they are less likely to "bridge" to the coating and create a rough parting line than a metal mask.

    caps and plugs

There are many standard sizes available and they can also be custom made to fit a certain product.


Specific sizes can be purchased at a reasonable cost in quantity. Sample kits with a variety of different plugs can be purchased to test different sizes and see what works best in a given situation. It is a good idea to have an assortment of sizes and styles around for product testing.

powder coating caps and plugs

Caps and plugs are made of PVC, neoprene, silicone and other thermoplastic materials. The correct type for a specific masking job depends on the price and cure process.


High temperature materials are required for powder coating operations. For example, silicone plugs may be capable of withstanding temperatures of 600 °F (315 °C).

Neoprene is usually only good to temperatures of 275 °F to 350 °F

(135 °C to 177 °C).

Select a material that will meet all of the demands

of the process for a fair price.

caps and plugs for powder coating


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  spray booth  spray gun  substrates

hi-temp tapes  types of powder


June 14, 2012