Glossary

H

Hardener
An activator curing agent, catalyst or cross-linking agent.

Hardness
The degree to which a material will withstand pressure without deformation or scratching.

Hg
Inch Pound

Hiding
The ability of a coating to obscure the surface to which it is applied.

High Build
A term referring to a coating which can produce a thick film in a single coat.

High & Ultra High Pressure Water Jetting
Cleaning of concrete or steel surfaces by spraying water at pressures between 5,000 & 45,000 psi (35-300 MPa) to remove heavy encrustation of dirt and loose, friable material. This method can also remove some coatings. See low-pressure Water Cleaning.

Holiday
Any discontinuity, bare or thin spot in a painted area.

Hot Rolled Steel
Steel, which has been formed while still hot, generally characterized by the presence of bluish-black mill scale.

Hydrocarbon
Extracts from petroleum such as gasoline, lubricating oils, solvents, etc.

Hydrophilic
A substance which absorbs or has an affinity for water. (Water loving)

Hydrophobic
A substance which does not absorb or exhibit an affinity for water. (Water fearing)