Glossary of Terms
The content of this glossary is provided for informational purposes only
- Idler
- a wheel, gear or roller inserted into a drive train primarily for the function of guiding, supporting or tensioning a portion of the drive train.
- Immiscible
- incapable of being mixed without separation of phases. Water and petroleum oil are immiscible under most conditions, although they can be made miscible with the addition of an emulsifier.
- In-line filter
- a filter assembly in which the filter element is mounted along the same orientation as the filter inlet and outlet.
- Indicator
- a device which provides external evidence of sensed phenomena.
- Indicator, differential pressure
- n indicator that signals the difference in pressure between two points, typically between the upstream and downstream sides of a filter element.
- Influent
- the material entering a system.
- Infrared spectra
- a graph of infrared energy absorbed at various frequencies in the additive region of the infrared spectrum. The current sample, the reference oil and the previous samples are usually compared.
- Ingested contaminants
- environmental contaminant that enters a system due to the action of the system or machine.
- Inhibitor
- any substance that slows or prevents such chemical reactions as corrosion or oxidation.
- Insolubles
- residues of carbon or agglomerates of carbon and other material such as spent additives or oxidation by-products.
- Interfacial tension (IFT)
- the energy per unit area present at the boundary of two immiscible liquids, usually expressed in dynes/cm.
- ISO Solid Contaminant Code
- a index number code assigned on the basis of the number of particles per unit volume, allowing quick assessment of contamination.
- ISO viscosity grade
- a number indicating the nominal viscosity of an industrial fluid lubricant at 40°C (104°F) as defined by ISO Standard 3448. For example, an unused ISO 68 grade product would be expected to show a viscosity at 40°C of 68 cSt, plus or minus 10% (6.8 cSt). This pattern is maintained throughout the ISO viscosity grading system.