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Sagging
The downward flow of a paint or powder that is applied too heavy or onto a hot surface.
Salt Spray Test
Corrosion test using salt laden moist air in an enclosed chamber, the air can be acidic.
Sand Blast
Blast cleaning using sand or an abrasive to remove corrosion by impact.
Saponification
* Alkaline hydrolysis of fats to make soaps.
* Test for coating resistance to an alkaline environment.
* Hydrolysis of an ester by an alkali.
Scale
Rust occurring in layers, commonly found on hot rolled steel
.
Screen Mesh Size
The mesh number of a screen designates the openings per square inch or the wire.
Soils
Foreign matter on a part of the substrate to be cleaned in a pre-treatment system.
Solids
Non-volatile portion of the coating material.
Solution
Mixture formed when one material is dissolved into a liquid.
Solvent
Liquid or blend of liquids used to dissolve or disperse paint. A true solvent is a liquid that can dissolve the paint resin.
Solvent Wash
Cleaning using a degreasing solvent or mixture of solvents (often referred to as "gun wash")
Specific Gravity
Sg. An expression of density of a material relative to the density of water (always classed as 1)
Specular Gloss
Mirror like reflectance, gloss measured at a specific angle.
Spray Chamber
An enclosure that surrounds the pre-treatment process and contains the spray cloud.
Spray Pattern
Configuration of the spray leaving the powder gun.
Storage Stability
The ability of the coating to maintain uniform physical and chemical properties subject to the manufacture'rs specification (time and temperature).
Stripper
Chemical or mechanical method of removing the coating from the substrate.
Stroke
A single pass with a spray gun in one direction.
Substrate
The part being coated.
Surface Appearance
Generally refers to the smoothness and gloss of the final cured film, and/or the presence of defects or contamination.
Surface Defects
Flaws in the surface of the coated parts.
Surface Preparation
Operations necessary to prepare the surface or parts prior to the application of the coating.
Surface Tension
Cohesive force between liquid and solid (or liquid and gas) surfaces.
Surfactant
A chemical used to adjust the surface tension between two mediums.
Surge
* A rise in pressure in an electrical circuit.
* A sudden burst of powder from a spray gun.
Suspension
Mixture of fine particles of any solid with a liquid or gas.
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