Polymeric Coatings Glossary
As with any industry specialty, the polymeric resin coatings field has its own language. We offer this glossary of terms to help you write and understand product and project specifications.
Abrading – The act of roughening a substrate’s surface to provide texture that the final lining material can key into to form a permanent bond
ASTM –The published standards of the American Society for Testing and Materials, located in West Conshohocken, PA. The acknowledged basis of all U.S. claims for performance and safety of industrial materials.
Bond – The ability of a coating or lining to permanently cling onto or key into the substrate; measured in pounds per square inch or PSI
Buckling – Failure of structural integrity under loads
Bugholes – Tiny voids in a concrete substrate that may have been created by the trapping of bugs in the wet mixture and the deterioration of the bodies after they died. Also, holes of similar size.
Compression – The ability of a coating or lining layer to shrink in width under weight or other pressure without losing structural integrity
Creep – A time-dependent deformation of a material while under an applied load that is below its yield strength. It is most often occurs at elevated temperature, but some materials creep at room temperature.
Creep or Stress Rupture – The sudden and complete failure of a material held under a definite constant load for a given period of time at a specific temperature.
Density – The relationship between the mass of a substance and how much space it takes up (volume)
Efflorescence – Powdery substance, usually white, that forms on the surface of concrete and other cementitious products as the result of excessive amounts of moisture in the masonry mixing with soluble compounds within the masonry or in surrounding soil. The powder is on the masonry surface is actually salt deposits that formed when the water dries out.
Flexural – The ability to twist and bend without losing structural integrity
High-Build – A thick application
High Voltage Spark Test – A critical test applied with high-voltage holiday (unacceptable discontinuities such as pinholes and voids) detection equipment to corrosion protection applications —coatings less than 250 mils—after the protective coating has set hard to the touch.
Hydraulic Load – The amount of liquid going into a system
Laitance – A weak layer of cement and aggregate fines on a concrete surface, usually caused by an overwet mixture, overworking the mixture, improper or excessive finishing, or combination thereof. This layer between a topical coating and the underlying substrate prevents a bond forming between the topical coating and substrate, eventually causing delamination and failure of the topical coating.
Material Safety Data Sheet – A document containing information on the potential hazards (health, fire, reactivity and environmental) and how to work safely with a chemical product; an essential starting point for the development of a complete health and safety program.
Modulus of Elasticity (also known as the elastic modulus, the tensile modulus, or Young's modulus) – A number that measures an object’s or substance's resistance to being deformed elastically (i.e., non-permanently) when a force is applied to it. The elastic modulus of an object is defined as the slope of its stress–strain curve in the elastic deformation region:
Monolithic – One continuous surface with no seams, breaks or voids
NACE - The published standards of National Association of Corrosion Engineers (NACE International), located in Houston, TX. . The acknowledged basis of all U.S. claims for performance and safety of anti-corrosion coatings and products.
Pinholes – Tiny holes or pockets in a substrate or surface
Plural component – A formula that contains the resin body and a curing agent that causes the mixture to harden at a determined rate under certain conditions
Porosity – The level of void space in any given material; i.e., the negative spaces in a lining layer surrounded by actual material
Pull-Off Test – A near-to-surface method to test the adhesive connection between a surface (substrate) and a lining or coating
Recoat Window – The period of time following the initial application of a layer of lining during which subsequent layers may be applied over the top and still adhere properly to the bottom coat without requiring additional surface prep
SSPC - The published standards of the Society of Protective Coatings, located in Pittsburgh, PA. The acknowledged basis of all U.S. claims for performance and safety of protective coating materials.
Soil Cover – The depth of soil over the top of the structure, expressed in inches or feet.
Soil Load – The number of pounds of pressure per cubic foot created by the soil and other overburden on any given structure.
Soil Modulus – Expressed in pounds per square inch or PSI
Substrate – The surface on which a lining is to be applied; the support for a coating
Tensile – The ability to stretch or elongate without breaking, and while maintaining specified strength
Topcoat, Topcoating – The application of a finishing layer over one or more initial layers of a spray- or trowel-applied lining; topcoat may or may not be the same material as sublayers
Traffic Load – Total vehicular traffic carried by a road during a specified time interval
Voids – Larger holes or pockets in a substrate or surface
Volatility – The tendency to ignite or explode under certain conditions
Water Table – The level below which the ground is saturated with water, expressed in inches or feet.