Terms and definitions of painting

Some of the main definitions applicable to a painting process are defined below:

Corrosion Ability of an environment to cause corrosion in a given system

Curing Hardening of the liquid paint by heat or by chemical reaction

Curing Agent Is the component which produces the chemical reaction linking the molecular chains of the binder together in original structure

Dew Point Surface temperature at which the moisture in the air condenses on a solid surface

DFT The thickness of the painting product, Dry Film Thickness (DFT), remaining on the substrate after the paint has hardened

Dry to Handle When the paint surface is sufficiently hardened to be freely handled without damage

Durability The estimated duration of the effectiveness of a painting system, until the first important maintenance operation

Finish The last coat of paint in a system, whose function is to protect the underlying coat(s) from the environment, to contribute to the corrosion resistance of the entire system and provide the required color

Flash Point The lowest temperature at which the solvent in the paint gives off sufficient vapor to form ignitable mixture with the air above its surface

Hard Dry When the drying has reached such a stage that if desired, a further coat can be satisfactorily applied

High Build A paint that can produce thick dry films per coat

Intermediate The coat between the primer coat and the finish coat

Minimum time of recoat the minimum interval required between the applications of two successive coats of paint

NDFT the Nominal Dry Film Thickness (NDFT) specified by this painting specification

Pot Life Maximum time within which a painting product supplied as separate components can successfully be used after they have been mixed

Primer The first coat of a painting system whose function is to provide strong adhesion with the prepared metal substrate. It must form a strong base and provide adhesion for the later coats. It also provides protection against corrosion prior to the application of the Intermediate and/or finish coats.

Shelf Life Time during which a paint remains in good condition in its original sealed container, under normal storage conditions

SSPC Steel Structure Painting Council

Stripe Coat Coat applied by brush or roller to ensure adequate protection of sharp edges, welds, areas that are difficult to reach, etc. and to ensure that the DFT required in these areas is met

Specific Gravity Weight in Kg per liter of paint at 25°C (77°F)

Substrate The base metal surface in which the coating is applied

Surface Temperature Operating surface temperature of the item to be painted

Tie Coat Coat having the function of improving adhesion between the other coats of the paint system, or of the paint system to the substrate

Touch Dry When very light pressure is applied with a finger and it does not leave a mark on the surface

Touch-Up Touch-Up is preforming paint repair to a painted surface that has become damaged

VOC Volatile Organic Compound (VOC) is an organic liquid or solid that evaporates spontaneously at the prevailing temperature and pressure of the atmosphere with which it is in contact

Volume Solids Volume solids of paint is the ratio of the nonvolatile components present in it to the total volume. This is the most important factor which determined the coverage of paint.

WFT The thickness of the painting product, Wet Film Thickness (WFT), to be measured during application.

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