Impact Resistant – Ability to resist deformation from impact.
Incompatibility – Inability to mix with or adhere to another material.
Indicator Paper (pH) – A vegetable dyed paper indicating relative acidity or basicity.
Inert – A non-reactive pigment: filler
Inhibitor – Material such as primer used to retard rusting or corrosion.
Inorganic Coatings – Containing no carbon.
Intercoat Adhesion – The adhesion between two coats of paint.
Intercoat Contamination – Presence of foreign matter between successive coats.
Interior – The inside surfaces of a structure.
Intermediate Coat – The coating between the primer and finish; often called a barrier coat.
Intumescent Coating – A coating material which by foaming or swelling forms a voluminous substance when exposed to heat
Joint Cement – Cement used for drywall construction; also used as a bedding compound for joint tape and as a filler for nail holes.
Joint Tape – Special paper or paper-faced cotton tape used to cover joints between wallboard to conceal the joint and provide a smooth surface for painting.
KB Value – Measure of solvent power.
Ketones – Organic solvents containing CO grouping; commonly used ketones; acetone, dimethyl ketone, MEK-methyl ethyl ketone
Knotting – Solution of shellac in alcohol solvent used to seal knots found in new wood.
Kreb Units – Units of viscosity.
Lacquer – Coating that dry by solvent evaporation.
Laitance – Milky white deposit on new concrete; efflorescence
Laminar Scale – Rust formation in heavy layers.
Lap – To lay or place one coat so its edge extends over and covers the edge of a previous coat, causing an increased film thickness.
Lapping – Defect where visible distinct boundaries of wet and dry layers of paint had overlapped producing lines of color density or gloss difference.
Latex – Rubber like common binder for emulsion (water) paints.
Leaching – The process of extraction of a soluble component from a mixture with an insoluble component by percolation of the mixture with a solvent, usually water
Leveling – Ability of a film to flow out free from ripples, pockmarks and brush marks after application.
Lifting – The softening and penetration of a previous film by solvents in the paint being applied over it, resulting in a raising and wrinkling.
Linings – Internal barriers; coated or sheet type.
Linseed Oil – A drying oil used in paint, varnish and lacquer.
Livering – An increase in the body of coatings as a result of gelatin or chemical reaction in storage.
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