acid number


Also found in: Dictionary, Thesaurus.
Related to acid number: Iodine number

acid number

[′as·əd ¦nəm·bər]
(chemistry)
(engineering)
A number derived from a standard test indicating the acid or base composition of lubricating oils; it in no way indicates the corrosive attack of the used oil in service. Also known as corrosion number.
References in periodicals archive ?
The acid numbers and Rancimat IPs were also not impacted by passing through the HPCR.
HFC = Hydrofluorocarbon HPLC = High Performance Liquid Chromatography IC = Ion Chomatography ICP = Inductively Coupled Plasma POE = Polyolester POENP Ether = Polyoxyethylene Nonylphenyl Ether TAN = Total Acid Number TEA = Triethanolamine TOA = Total Organic Acid
Based on criteria such as visual changes, Total Acid Numbers, organic anion and dissolved metal concentrations after aging, the following conclusions were reached regarding the relative stability and compatibility of the different lubricant/C[O.
For both WRSSB6 and WRSBO, coatings formulated with resins having an acid number of 40 gave a slightly lower [T.
Amnio acid identity between porcine GLUT4 and other mammalian GLUT4 GLUT4 Identity (%) Predicted amnio acid number Porcine 509 Human 94.
This requires less monitoring and control of the flux's acid number and viscosity, and reduces the need for thinner addition.
Additional laboratory tests indicated that changes in conductivity closely matched variations in a chemical signature known as total acid number, a sign of oil quality.
Periodic oil changes eliminate carbon formation by keeping the acid number low.
The divalent calcium will only cause a noticeable problem with polymers that have a significant acid number, and in rather apolar offset ink media, the calcium will not be charged as it is in aqueous media (and therefore will not be able to interact with whatever minimal acidity does exist on the grind resin).
Also, existing corrosivity indexes such as the total acid number are insufficient indicators of a crude stock's real potential to corrode the storage tanks, pipelines and refining equipment that contain, transport and process it.
The Waukesha engine service bulletins are specific about the maximum total acid number (TAN) permitted in the lubricating oil, in relation to the total base number (TBN) of the oil.
Depending on the nature of the lubricant, you get undesirable effects such as viscosity increases and acid number increases, all of which could cause wear and corrosion.