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Outgassing and Its Importance in Powder Coating

Updated: Jan 8, 2023

Outgassing is the process of removing gases that are trapped within a material. These gases can come from various sources, including the material, its impurities, and the manufacturing process. When a part is powder coated, it is first cleaned and then heated to a high temperature to melt and fuse the powder onto the surface of the part. Gasses trapped inside the part can be released during the heating process and cause problems with the powder coating.

The most common issue caused by outgassing is bubbles or blisters in the powder coating, weakening the coating and making it less durable. Outgassing can also cause the powder coating to come off the part or peel, leading to costly repairs or even product failure. These issues can be particularly problematic in industries where the coated parts are subjected to high temperatures or other harsh conditions, such as the automotive, aerospace, and defense industries.

To prevent these issues, it is essential to outgas parts before powder coating. Outgassing is done by heating the part in an oven or using a vacuum chamber to remove the gases. Outgassing helps ensure that the powder coating adheres properly to the part's surface and provides the desired level of protection and durability.

There are several methods for outgassing parts before powder coating. One standard practice is to bake the part in an oven at a high temperature for a set time. This method is effective at removing gases from the surface of the part, but it may not be able to release gases that are trapped deep within the material.

Another method for outgassing is to use a vacuum chamber. A vacuum chamber is a sealed container that can be evacuated to create a vacuum or a space with no air. When a part is placed in a vacuum chamber, the gases trapped inside the part are drawn out by the vacuum, leaving the part gas-free. This method removes gases from deep within the material more effectively than baking, but it can be more expensive and time-consuming.

Regardless of the method used, following proper procedures and protocols is essential when outgassing parts. You should carefully temperature and duration of the outgassing process to ensure that the gases are effectively removed without damaging the part.

Outgassing is a crucial step in the powder coating process, as it helps ensure that the coating adheres properly to the surface of the part and provides the desired level of protection and durability. Without outgassing, parts may be prone to issues such as bubbles, blisters, and peeling, which can lead to costly repairs or product failure. By following proper outgassing procedures, manufacturers can ensure that their coated parts meet the necessary standards and specifications for their intended use.


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