Beginners’ Guide to Powder Coating

What’s the theory of electrostatic powder coating? 

Electrostatic powder coating works through a spray gun electrically charging atomised particles. 

Powders are pneumatically delivered to the spray gun and get charged as they exit the spray nozzle, this causes them to repel each other and spread themselves evenly. The object being coated is charged oppositely, or grounded. This means that the powder material is attracted to the object, giving a quick and even coverage to the surface, as well as reduce the amount of overspray. 

What’s the complete process of powder coating? and what equipment is required?

A powder spray gun applies electrically charged powder to grounded parts. this process is acted in a powder coating booth that collects overspray for recyling The coated parts are then placed in a powder curing oven, where the coating chemically reacts with heat to form long molecular cains with high cross-link density, making it tougher and more durable.

What is the high voltage range of electrostatic powder coating?


What is the powder coating spraying distance to workparts?

Normally 15-30mm

What is the powder coating coverage rate?

Normally three will be 60-70% powders attached to object surfaces, which means there are 30-40% powders oversprayed that will be recycled or wasted.

What is the thickness of electrostatic powder coating film?

Generally, thickness of electrostatic powder coating film is 60-80μm.

What is the filtration and service life of powder coating booth filters?

Filtration can be 0.1-0.3 micrometer, service life is about 3-5 years.

What is the heating time and temperature of coated workparts in powder curing oven?

  • It usually requires15-30 minutes at 180℃ (max. 250℃), and these parameters will varies with different type of powder coatings. 

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