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Glossary is courtesy www.paintquality.com.
Acrylic: A synthetic polymer used in high-performance latex or water-based paints. As the paint's binder, acrylic resins enable the coating to last longer and retain its color.
Acrylic Latex Paint: Water-thinned paint which employs acrylic resin as the majority of the binder. Other binders which may be added to reduce cost or add specific properties includestyrene, epoxy, and poly-vinyl acetate.
100% Acrylic Latex Paint: Water-thinned paint in which only acrylic resin is used as the binder medium. Typically the highest quality latex paints used for a wide variety of architectural coatings, 100% Acrylic Latexes have superior adhesion, long-term flexibility, breathability, alkali resistance, toughness, and color and sheen retention.
Acrylic Resin: Resins which have established a pre-eminent position among coating formulators, having shown superiority in such respects as color and gloss retention, alkali and oxidation (chalk) resistance, hardness, adhesive and cohesive strength, and overall film durability. Generically, resins resulting from the polymerization of derivatives of acrylicacids, including esters of acrylic acid, methacrylic acid, acrylonitrile, and their copolymers. Also known as acrylate resins.
Adhesion: The ability of dry paint to remain on the surface without blistering, flaking or cracking. Adhesion is probably the single most important property of paint. Wet adhesion, the ability of dry paint to adhere to the surface in spite of wet conditions, is particularly important for exterior house paints.
Airless Spraying: Process of atomization of paint by forcing it through an orifice at high pressure. The effect is often aided by the vaporization of the solvents, especially if the paint has been previously heated.
Alkyds: Resins used mostly in trim paints, inside and out, although some medium duty equipment and marine enamels employ these resins as binders. Most often alkyd resins are found in vehicles employing aliphatic hydrocarbons (mineral spirits or other refined petroleum distillate) as thinner. Alkyds offer good leveling properties and cure to a relatively durable film, but tend to yellow interior and embrittle with age. Color and gloss exterior is only fair, and alkyds are highly prone to failure exterior on surfaces containing even moderate levels of moisture. Chemically, alkyds are synthetic resins formed by the condensation of polyhydric alcohols with polybasic acids. They may be regarded as complex esters. The most common polyhydric alcohol used is glycerol, and the most common polybasic acid is phthalic anhydride. Modified alkyds are those in which the polybasic acid is substituted in part by a monobasic acid, of which the vegetable oil fatty acids are typical.
Binder: The binder cements the pigment particles into a uniform paint film and also makes the paint adhere to the surface. The nature and amount of binder determine most of the paint's performance properties -- washability, toughness, adhesion, and color retention. Acrylic polymers are the binder of choice in producing quality high-performance latex paints.
Bituminous Paint: (1) Originally, the class of paints consisting essentially of natural bitumens dissolved in organic solvents. They may or may not contain softening agents, pigments, and inorganic fillers. They are usually black or dark in color. Within recent years, the term "bituminous" has, by common usage, come to include bitumen-like products such as petroleum asphalt. (2) A low cost paint containing asphalt or coal tar, a thinner, and drying oils; used to waterproof concrete and to protect piping where bleeding of the asphalt is not a problem.
Bleaching: Loss of color, usually caused by exposure to sunlight.
Blistering: The formulation of dome-shaped, hollow projections on paint, often caused by heat or moisture. Can also be caused by solvent entrapment in a paint film which has surface dried before the solvent has completely escaped.
Calcimine: Also spelled "kalsomine." Essentially, chalk and glue ready to mix with water. Used as a decoration for interior surfaces. It will not withstand washing. In Britain, it is referred to as powdered distemper.
Catalyst: Substance whose presence increases the rate of a chemical reaction. In some cases, the catalyst functions by not being consumed and regenerated; in other cases the catalyst seems to not enter the reaction and functions by the virtue of surface characteristics of some kind. A negative catalyst (inhibitor, retarder) slows down a chemical reaction. Chalking: Formation of a friable powder on the surface of a paint film caused by the disintegration of the binding medium due to disruptive factors during weathering. The chalking of a paint film can be considerably affected by the choice and concentration of the pigment. It can also be affected by the choice of the binding medium.
Coal Tar: A dark brown to black cementitious material produced by the destructive distillation of bituminous coal.
Color Retention: The ability of paint to keep its original color and resist fading.
Consistency: The resistance of a paint to flow. A paint with high consistency flows slowly; a paint with low consistency flows readily.
Cracking: Breaks or splits in the paint's surface.
Durability: The degree to which paint withstands the destructive effects of the environment to which it is exposed, especially harsh weather conditions. Durability has two aspects. Its protective properties safeguard the substrate from degradation. Its decorative properties allow the paint to retain its attractive appearance.
Efflorescence: An encrustation of soluble salts, commonly white, deposited on the surface of coatings, stone, brick, plaster, or mortar; usually caused by salts or free alkalies leached from mortar or adjacent concrete as moisture moves through it.
Elasticity: The ability of paint to expand and contract with the substrate without suffering damage or changes in its appearance. Expansion and contraction are usually caused by temperature fluctuations. Some substrates such as yellow pine expand at different rates depending on the type of their grain. Elasticity is a key to durability. Acrylic binders are noted for their elasticity.
Enamel: (1) Topcoat which is characterized by its ability to form a smooth surface; originally associated with a high gloss, but may also include lower degrees of gloss, i.e., flat enamels. (2) A class of substance having similar composition to glass with the addition of stannic oxide, SnO2, or other infusible substances to render the enamel opaque.
Extender: A less-expensive ingredient than titanium dioxide that fills out and extends the pigment's capabilities. Extender cannot be used without pigment. Some common extenders are clays, calcium carbonate, and silica.
Fading: Lightening of the paint's color, usually caused by exposure to light or heat.
Film Formation: The paint's ability to form a continuous dry film. This process is the result of the water or solvents evaporating and the coming together of the binder particles. A continuous dry film repels water.
Flaking: The detachment of pieces of paint from the substrate, caused by a loss of adhesion and elasticity. Also known as scaling. Glycol: A co-solvent, combined with water in aqueous (latex) systems to form the total thinner. Various glycols perform various functions, however, they are generally valuable as brushing agents and for temperature stability (ethylene glycol is the chief ingredient in anti-freeze). Generically, CH2OHCH2OH. General term for dihydric alcohols; ethylene glycol is the most simple of the glycols.
Hiding Power: The ability of paint to hide or obscure a surface, color or stain over which it has been uniformly applied. Hiding power is provided by the paint's pigment.
Holidays: Application defect whereby small areas are left uncoated. Syn: Misses, Skips, Voids, Discontinuities, Vacations.
Intumescent Coatings: Fire retardant coating which, when heated becomes plastic and produces nonflammable gasses, such as carbon dioxide and ammonia. The gasses are trapped by the film, converting it to a foam about fifty times as thick as the original paint film. At this stage, the film solidifies, resulting in a thick, highly insulating layer of carbon, which effectively protects the substrate from fire.
Latex: (1) Stable dispersion of a polymeric substance in an essentially aqueous medium. (2) Fine dispersion of rubber or resin, natural or synthetic, in water; the synthetic is made by emulsion polymerization. (Strictly speaking, after polymerization a latex is a solid dispersed in water, and therefore is not an emulsion. Latex and emulsion are often used synonymously in the paint industry.)
Latex Paint: Water-thinned paint made with synthetic binders such as polyvinyl acetate or acrylic resins. In contrast to oil-based paint, latex paint dries fast, flows smoothly, and cleans up easily with water. High-performance latex paints contain 100% acrylic resins.
Leveling: The ability of a coating to form a smooth film without brush marks appearing. Higher quality latex paint has superior leveling ability.
Metamerism: A phenomenon exhibited by a pair of colors which match under one or more sets of conditions, be they real or calculated. Metamerism should not be confused with "flair" or color constancy, terms which apply to the apparent color change exhibited by a single color when the spectral distribution of the light source is changed or when the angle of illumination or viewing is changed.
Mildewcide: Chemical agent in quality paint that retards mildew, a common problem in humid climates.
Peeling: The detachment of paint from the surface in ribbons or sheets. Like flaking, the result of loss of adhesion. Pigment: Finely ground, natural or synthetic, inorganic or organic, insoluble dispersed particles (powder) which, when dispersed in a liquid vehicle to make paint, may provide, in addition to color, many of the essential properties of the paint: opacity, hardness, durability, and corrosion resistance. The term is used to include extenders, as well as white or color pigments. The distinction between powders which are pigments and those which are dyes is generally considered to be on the basis of solubility. Pigments being insoluble and dispersed in the material, dyes being soluble or in solution when used.
Polymer: This binder is produced from petrochemical feedstocks. The binder's polymer particles are small in size and carried in water. The binder polymers and water mix is known as emulsion.
PVA (Polyvinyl Acetate): A colorless, thermoplastic, water soluble, resinous high polymer derived from the polymerization of vinyl acetate with a catalyst; used as a latex binder in certain, generally lower quality water-base coatings.
PVC (Pigment Volume Concentration): The ratio of the volume of pigment to the volume of total nonvolatile material (i.e., pigment and binder) present in a coating. The figure is usually expressed as a percentage.
Resin: (1) General term applied to a wide variety of more or less transparent and fusible products, which may be natural or synthetic. They may vary widely in color. Higher molecular weight synthetic resins are generally referred to as polymers. (2) A solid, semi-solid, or pseudo-solid organic material that has an indefinite and often high molecular weight, exhibits a tendency to flow when subjected to stress, usually has a softening or melting range, and usually fractures conchoidally. (3) In a broader sense, the term is used to designate any polymer that is a basic material for coatings and plastics.
Silicate: Any one of a large family of substances chiefly used with titanium dioxide, the primary pigment, as an extender pigment. When used in moderation, these silicates (magnesium silicate, aluminum silicate, etc.) are valuable in helping control gloss, aid brushability, and increase hold-out properties and overall exterior durability. Spattering: Droplets of paint that spin or mist off the roller as paint is being applied.
Surfactants: Contracted from surface-active agents, these are additives which reduce surface tension and thereby improve wetting (wetting agents), help disperse pigments, inhibit foam, or emulsify. Conventionally, they are classified as to their charge: anionic (negative); cationic (positive); nonionic (no charge); or amphoteric (both positive and negative).
Thinner: The thinner and binder together form the paint's vehicle. Water, the thinner used in latex paints, evaporates as the paint dries, allowing a smooth paint application. Turpentine or spirits are the thinners in oil-based paints.
Thixotropic: Adjective which describes full-bodied material which undergoes a reduction in viscosity when shaken, stirred, or otherwise mechanically disturbed and which readily recovers the full-bodied condition on standing.
Titanium Dioxide, Anatase (TiO2): A high opacity, bright white pigment of the chalking type, used as a prime pigment in paints, rubber, plastics. Prepared from the mineral ilmenite, or rutile ore.
Titanium Dioxide, Rutile (TiO2): A high opacity, bright white pigment of the non-chalking type, used as a prime pigment in paints, rubber, plastics. Prepared from the mineral ilmenite, or rutile ore.
Vehicle: The liquid portion of the paint, in which the pigment is dispersed; it is composed of a binder and a thinner.
Vinyl: (1) The unsaturated, univalent radical CH2: CH -- derived from ethylene. (2) Any of the various compounds containing this group, typically highly reactive, easily polymerized and used as a basic material for coatings and plastics. (3) Any of the various plastics, typically tough and flexible.
VOC (Volatile Organic Content): Any carbon compound that evaporates under standard test conditions. Essentially, all paint solvents except water are VOCs. Federal and state governments are beginning to limit the amount of volatile organics found in paint because of concerns about possible environmental and health effects.
Volume Solids: The volume of pigment plus binder divided by the total volume, expressed as a percent. High volume solids mean a thicker dry film, improved hiding, and high durability.
Washability: Ease with which washing will remove dirt from the paint's surface without causing damage.
Wet Edge: Edge of a wet painted area which remains workable. When painting large surfaces, it is generally necessary to join up to the edge of a paint film which has been left for an appreciable time; when this can be done by blending this edge with free working paint without any lap showing, the film is said to present a wet edge.
Zinc Chromate: Bright yellow pigment which chemically is substantially zinc chromate, although its precise composition is rather complex. Its chief use is in anti-corrosive paints and primers for steel.
Zinc Oxide: A fine particle, white pigment used in rubber, paint, and plastic industries for mildew resistance and film reinforcing properties.
Zinc Rich Primer: Anti-corrosive primer for iron and steel incorporating zinc dust in a concentration sufficient to give electrical conductivity in the dried film, thus enabling the zinc metal to corrode preferentially to the substrate, i.e., to give cathodic protection.
Glossary is courtesy The Paint
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