Glossary of terms used in Powder Coating

The powder coating process is complex and detailed. Professional powder coaters are quality assured and undergo a stringent ongoing process of examination and assessment to ensure that current high standards are maintained.

The new Gema Paint plant now gives superior paint quality. minimal wastage and improved lead times.

The powder coating process comprises many technical terms.

The powder coating process also has a varied glossary of terms. To help you understand powder coating and finishing we created this Glossary of Terms used in Powder Coating.

Abrasive – A selection of coarse materials used to clean metal prior to finishing  Examples include plastic beads, grit or sand as well as steel shot

Acrylic – A powder coating containing polymers of acrylic.

Accelerator – A specialist material designed to speed up the hardening and curing process.

Additives – Additives are chemicals applied to the powder coating process to improve certain properties such as gloss controls, curing and texturing additives.

Adhesion – The bonding process whereby a firm attachment happens with a coating.  Adhesion can be affected by the surface requiring finishing and surfaces should be clean, smooth and non porous.

Alkaline – Substances and environments that are high in basic Ph value.

Ambient – The environmental conditions that can affect how well the powder coating process is applied and cured.

Application – The process of applying a powder coating to a finish or a substrate.


Back Ionization – This is a build up of powder particles during the electrostatic application. It limits the ability of additional powder to be deposited onto the metal to be coated.

Binder – The resin that are the main powder component.  This polymerises and binds the other components into the solid powder coating film.

Blooming – A haze forming on the powder coating that can be removed when required.

Bonding – The process whereby the polyester powder bonds onto the surface being painted.

Brightness – The surface reflects light and gloss levels are established.

Blistering – Blistering occurs when bubbles formed under a the powder coated surface.  It is usually a result of the expansion of trapped air, moisture, or corrosion.


Cartridge Booth – A specific type of booth containing systems to recover powder overspray that can be collected and reused.

Cleaner – These are detergents, solvents or other approved cleaning materials that are used to clean and prepare surfaces prior to powder coating.

Contamination – Occurring where foreign bodies such as dirt hinder the quality of the finished coating.

Curing – The hardening process to enable powder to bond and cure on the profile once powder coated.

Delamination – The separation between two layers of coating or the coating and the substrate.


Dry Film Thickness – Depth of applied coating powder before curing.

Edge Coverage – A coating powder’s ability to flow over, build, and adhere to sharp corners, angles and edges.

Epoxy – a coating manufactured with epoxy resin that has high corrosion resistance and colour retention when exposed to sunlight.

Micron – The standard unit of measuring the thickness of a powder coated finish in 1/1000 of 1mm.

Orange Peel – A surface appearance similar to the skin of oranges. Caused by restricted flowing powder on the material to be coated.

Pretreatment – The preparation of the component to be powder coated to improve powder adhesion and corrosion resistance when finished.

Recovery – The process whereby powder that has not bonded to the surface and is surplus is recycled and re-used.

Stripping – The procedure whereby original powder coating is stripped to enable the profile to be recoated.

Touch-up – The repair of small damage on a painted surface that can normally be touched up with spray or liquid touch up paints int he same colour reference.

Virgin Powder – Fresh powder directly from the powder manufacturer that does not contain any recalled or recovered powder previously applied.