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Hairlines:
Narrow cracks in a substrate or coating film. Also known as hairline cracks.
Hiding Power:
The degree or ability of a paint to hide the previous surface color. Hiding power is given by the paint’s pigment.
High Efficiency Particulate Air Filters (HEPA):
Generally synthetic membranes with small pores that allow air to pass but stops airborne particles greater than 0.05 microns in diameter. Commonly used in clean rooms for semi-conductor manufacture.
High Gloss:
A dry coating film showing a gloss level greater than 80 units at 60 degrees.
High Solids:
A coating that has a greater solids level than a conventional version of that type of coating. True high solids coatings contain a level of 70% non-volatile (solids), but some types are impractical due to the viscosity of the binder.
High Volume Low Pressure (HVLP):
A type of paint spray equipment that uses low pot pressure (5-10 psi.) combines with a controlled, high volume stream of air (20 + cubic feet per minute) to atomize and project the coating onto a surface. Generally used in fine finishing or where high transfer efficiency and low overspray is required.
Holidays:
Voids, pinholes and missed areas in the dried paint film.
Hue:
The character of a chromatic color differentiating it from another color (such as red, green, blue) whether light or dark. The color whether tinted with white or shaded with clack is still the same hue.
HVLP:
See High Volume Low Pressure.
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