Powder Coating

Cure Ovens                                      Back to Powder-Coater Home Page 



When a thermoset powder is exposed to elevated temperature, it will

begin to melt. As the material begins to melt, it will flow out and then

chemically react to form a higher molecular weight polymer in a network- like structure.

This cure process, called crosslinking, requires a certain degree of temperature for a certain length of time in order to reach full cure and establish the full film properties that the material was designed for. The application of energy to the product to be cured can be

accomplished by convection cure ovens or infrared cure ovens.

A convection oven uses a heat source, most commonly a gas burner,

and a fan to heat the interior of an insulated enclosure. Different powder

materials require different cure temperatures, commonly in a range

between 350 °F and 400 °F (177 - 204 °C). The part is heated by the

hot air in the oven and it in turn conducts heat into the coating.



powder coating cure oven

The coating must be held at temperature for a predetermined length of

time to reach full cure. So the cure cycle is so many minutes at so

many degrees of temperature. The time it takes to bring the metal up

to temperature must be added to the cure time requirement to determine the full cycle time in the oven.


Convection cure time may be as short as 10 minutes or as long as 30

minutes, depending on the mass of the substrate and the cure requirements of the powder.

The generally accepted standard for curing is 20 minutes @ 400 deg F.

Convection curing is dependable and flexible. The oven can be adjusted along a full range of temperature requirements and the line speed can be adjusted for the time requirement.


The part can be exposed for a longer period of time than what is

called for, usually with no change in color, gloss or performance in the


Energy consumption is related to the load of product, the amount of insulation and the volume of exhaust. Typically, a gas-fired oven is very efficient and cost effective.


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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    powder selection

powder vs. liquid  racking  spray booth  spray gun  substrates

hi-temp tapes  types of powder  troubleshooting


June 18, 2012