Coating of tin cans, lids and tubes or the sheets they are made of. The stove enamel
coats are applied one after the other onto tin plate, steel (black plate), or aluminium
and baked separately.
Additive used to increase the rate of a chemical reaction. Not chemically
consumed in the reaction (different from curing agent).
Strong base or alkaline material.
Resin based on a complex carbohydrate
formed of microfibrils of glucose molecules.
Rheological additive for water-based paints based on cellulosic derivatives.
One hundredth of a poise. Unit of measurement for viscosity. (1.0 centipoise
= viscosity of water at room temperature).
Coating defect: formation of a powdery surface condition due to the disintegration
of the surface binder or elastomer caused by weathering, fuel, or other destructive
environmental factors (exposure to ultraviolet radiation...). Results on a
loss of gloss.
Coating defect: cracks in the surface of a paint film.
Additive that can form several bonds to a metal ion, in order to deactivate them.
Examples of chelating agents are: EDTA, ethylenediamine, phosphite.
Syn. Complexing agent
Coating's resistance to solvents, acids, and alkali testing done under watch
glass for 24 hours.
Irreversible adsorption due to the formation of chemical bonds between the
molecules of sorbat and sorbent across the interface. Chemisorption
is employed in the surface modification of pigments and substrates as more
efficient than the physical adsorption.
Resin formed by the reaction of rubber with chlorine gas. Often
used for chemical or water resistant properties.
Syn. Chlorobutadiene, Neoprene, Polychloroprene
Contamination removing material (detergent, alkali, acid...). Usually water
Reagent inducing chemical coagulation capable of destroying dispersions, including pigment
preparations and dispersion-type paints.
Some examples of coagulants are: salts, acids and some other electrolytes,
Syn. Coagulating reagent
Irreversible particle aggregation
that occurs in pigment suspensions, latexes, emulsions and dispersions.
Can be caused by various destabilizing factors such as addition of electrolytes, mechanical
shear, heat, freezing/thawing cycles, etc... .
Formation of resinous or polymeric material when
water evaporates from an emulsion or a latex
Additive which improves particle coalescence.
Facilitates the formation of coherent films from latexes and latex paints by temporarily
plasticizing (softening) the vehicle system. Coalescing agents reduce Tg value, but evaporate
from a drying film during the film forming process.
Dark brown to black bituminous material produced by the destructive distillation
Coating applied to a surface in a single application to form a film when dry.
Liquid, liquifiable or mastic composition that is converted to a solid protective,
decorative or functional adherent film after application as a thin layer.
Defects of wet and consequent dry coating films, affecting coating appearance
and sometimes performance.
Examples of coating defects: bubbles, craters, pinholes, orange peel, Benard
Number of coats separately applied, in a predetermined order, at suitable
intervals to allow for drying and curing, resulting in a completed job.
Premature drying of a coating during spraying causing a spider web effect.
State in which the particles of a paint film are held together into a continuous
film by primary or secondary valence forces.
Process by which paint is deposited by a series of rubber rollers which meter a thin film
of coating onto a continuous web of metal or plastic. After coating, the sheets are rolled
up to form so-called coils.
Suspension and dispersion of submicron particles in a liquid medium without
their dissolution in the medium.
Ability of colloids to keep
their dispersion, uniformity and associated properties despite the excess
of interfacial energy and a possible difference in the density between
the disperse phases and medium phase. Loss of colloid stability can result in
Aspect of paint film that depends
upon the spectral composition of the incident light, the spectral reflectance or transmittance
of the film, and the spectral response of the observer, as well as the illuminating and viewing
pigment, or other agent used to
impart a color to a coating.
Ability of a coating to retain its original color during weathering or chemical exposure.
Drier based on a combination of primary
driers and secondary
Ability of two or more coating components to mix with each other in a wet
or dry state to form a homogeneous composition without specific interactions.
Compatibility of the binder with other components (additives, other
resins, solvents etc.) is considered a major principle for formulating stable,
Substance of coating formulations (additive, co-solvent ...) which improves the
compatibility between resins.
Compound which improves the mobility of electrical charges in the paint.
Instrument used to evaluate a coating's resistance to cracking when bent over
a specified radius.
Large molecules obtained by simultaneous polymerization of different monomers,
as in vinyl copolymers.
Decay, oxidative decomposition, or deterioration of a metal in contact with
Additive used to protect lubricated metal surfaces against chemical attack by
water or other contaminants. Two different types of corrosion inhibitors are
inhibitors and inhibitors for long-term corrosion protection.
Substance which promotes or establishes a stronger bond at the resin
See also Adhesion promoter
Coating defect: splitting of a coating film as a result of
aging, formation of internal stresses or deformation of substrates.
Coating defect: small, shallow, bowl-shaped depressions in a coating film. These depressions
frequently have drops, particles or bands of material at their centers and raised circular
edges. Some common causes of cratering are: gel particles, oil droplets from
air lines, and substrate contamination.
Coating defect: tendency of a wet paint film to recede from certain areas
of a painted surface. This substrate de-wetting can be induced by a substrate contamination.
Coating defect: formation of surface cracks (similar to cracking) that change
the properties of the film. However, it is much less severe and does not penetrate
to the underlaying surface.
Coating defect: separation of emulsions. Particles
of the disperse phase concentrate in the upper layer, forming a cream-like
highly concentrated emulsion.
Formation of chemical bonds between polymer chains leading to the formation of
a three dimensional network. This kind of process has the effect of producing gel in a
polymer or converting it into a thermoset polymer.
Catalytic or reactive agent which when added to resin causes crosslinking of
Syn. Curing agent, Hardener
Coating application consisting in spraying the first pass in one direction and the second at a right angle to
the first, providing more even film distribution.
Process by which a coating is converted from the liquid to the solid state
by changement of the properties of the resin
by chemical reaction. Enamels cure. Lacquers do not cure.
Functional component of coating formulation, which reacts with liquid
resins during the film forming process to give hard, insoluble
Coating defect: long horizontal runs in a coating film that occur on vertical
surfaces when a coating is applied too heavily.