If you don't find the term you're looking for, please contact us. We regularly update our glossary. And, if you have any suggestions for processing terms that begin with "J", "K", or "Z", we'd like to hear from you about that, too.
A thin slice (10-30 mils thick) sawed from a cylindrical ingot (boule) of extremely pure, crystalline silicon, typically six to eight inches in diameter. Arrays of ICs or discrete devices are fabricated in the wafers during the manufacturing process.
Wafer Fab
Slang for wafer fabrication facilities, ultra clean factories where silicon wafers are produced.
Waste Treatment
Chemical and/or physical treatment of metal working fluids or mixtures of fluids prior to their disposal.
Water Content
The amount of water present in a liquid. Determined by Dean Stark or Karl Fisher method.
Water Hardness
The combined dissolved calcium and magnesium content of water. Usually expressed as parts per million (ppm), calcium carbonate (CaCO3). 1 gram = 17.1 ppm CaCO3 1 Clark° = 14.3 ppm CaCO3 1 German° = 17.9 ppm CaCO3
Water Quality
Water may account for as much as 90-99% of the metal working fluid mix. Its quality varies with the source. It may or may not contain dissolved minerals, organic matter, and microorganisms which can cause deterioration of the metal working fluid performance. Measurement of the following will help to estimate the effect of water on a metal working fluid mix.
Wetting Test
A measure of the ability of a surface active agent to reduce the surface tension of a liquid, thereby, causing it to spread more readily on a solid surface.
Process Geek Newsletter - sign up!
