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Caking
Agglomerations of powder on fluid bed walls or within the powder delivery system.
Calorie
Quantity of heat that will raise the temperature of 1 gram of water from 14.5 to 15.5oC.
Cartridge Booths
A type of recovery booth that incorporates a cartridge filter system to collect overspray powder.
Catalyst
A special chemical that promotes or accelerates the curing reaction or reduces stoving temperature.
Centrifugal
To force in a direction away from the centre.
Cavitations
Failure of a powder to flow into the intake of a feed system "rat holing".
CFM
Cubic Feet per Minute.
Chalking
Surface loss of colour and gloss in a coating from degradation of the binder by the UV components in sunlight. Can be seen as a white deposit on the cured coating surface.
Chemical Conversion Coating
A chemical treatment of the metal surface to convert it to another chemical form. It increases resistance to corrosion and promotes adhesion of the coating.
Chemical Stripper
A strong solvent or blend of chemicals that will remove the cured film from the metal substrate.
Chip
The result of breaking extruded powder coating after cooling (also known as kibble)
Chipping
The breaking away of small portions of a paint film due to the inability of that film to flex under impact, thermal expansion or the contraction of the surface.
Cissing Crating
round imperfections in the surface of the film, often caused by oil or silicone contamination.
Cleaner
Detergent, alkali, acid, solvent or any other material used to clean and degrease before the application of a coating.
Clearcoat
An un-pigmented coating. Can be a protective coating over a coloured or metallic basecoat or metal (example - brass).
Colour-fast
Non fading. The ability to maintain colour under specified conditions.
Compatibility
The capacity of powder coatings to be mixed and applied so as to show no visible, mechanical or any other detectable effect.
Composition
Formula, make up, analysis. A specific combination of ingredients.
Compressor
Machine design for compressing air or gas from an initial intake pressure to a higher discharge pressure.
Condensation
A formation of water molecules due to drastic temperature difference between two surfaces.
Contaminants
Foreign materials such as dirt, dust or oil that can be detected in the cured powder film, pre-treatment chemicals or air supply.
Continuity
Pinhole free film. A surface free from any defects.
Contrast Ratio
A value related to the hiding power of a coating. The ratio of reflectance of the coating over black and white backgrounds at equal film thickness.
Conversion Coating
(see chemical conversion coating)
Conversion
Coating Inorganic pre-treatment for metal substrates that prepare the surface for coating.
Co-polymer
Large molecules resulting from the simultaneous polymerisation of two or more monomer units.
Corona
An area of ionised air formed by a discharge of electricity commonly used in powder electrostatic spray equipment.
Corona Charging
The process of introducing a static electrical charge on powder particles by passing the powder through an electrical field generated by high voltage.
Corrosion
Decomposition or reaction of metal with oxygen, water or other chemicals.
Corrosion Inhibitor Pigments
Pigmants that retard the corrosion process in substrate.
Cracking
Splitting or disintegration of a powder film with breaks penetrating through to the substrate.
Crazing
Fine, random cracks or fissures in a paint film, caused by shrinkage.
Cratering
Small round depressions in a powder film.
Creep/Creepage
Corrosion under a scribe line or an area of damaged coating or edge, after salt spray testing or other testing.
Cross Contamination
A condition when two or more powders are mixed by accident usually reducing quality.
Cross Hatch
Test to determine adhesion.
Cross-linker
A chemical combination formulated to react with a resin to form a continuous film.
Cure
The reaction between resin and hardener to form the final film properties.
Cure Agent
Hardener or crosslinkers.
Cure Oven
Heated chambers for the purpose of stoving the powder coating.
Cyclone
A cylindrical devise that separates powder particles from air. The system works by centrifugal spinning the particles around its perimeter, the powder is collected at the bottom and the air extracted from the top.
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