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Paint and coatings terminology and definition of the terms

Various terms are used in the science of surface coatings, here are the details of various terminology used in the field of paint and coatings.

  • Paint and coatings terminology
  • Paint: A colorful material applied over various surfaces to impart some decorative and protective properties.
  • Coatings: Advanced category of paints normally applied in thinner layer over specialized applications mostly over metals and polymers etc. This includes chrome platings, galvanization process etc. along with organic coatings.
  • Coverage: Total surface area covered by the paint in per litre/gallon for example coverage in Ltr is measured as: m2/Ltr.
  • Weight per gallon/Ltr [WPL]: Weight of paint in grams/Kg or gallon in a litre volume. This provides density of the paint [Kg [mass]/ [volume]Ltr].
  • Volume solid: Solid of the paint by volume [and not by mass].
  • Non-Volatile Mass [NVM]: It is the total volatile content inside paint measured in percentage.
  • Viscosity: It is a measure of resistance to flow. Normally in paints the flow cups [Ford cup B4/B6 etc.] viscosity is very commonly used, and the measurement unit is in seconds.
  • Specific gravity: Specific gravity normally interchangeably used for density [due to references are taken with respect to water]. It is a measure of mass per unit volume. Higher the pigment and extender contain of the paint, higher is the density.
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