Examination of Lubricating Oils
Examination of Lubricating Oils
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The saponification value of oils is often made use of for identi- fication ; but as this value varies with the age of the oil, it is ex- tremely difficult to obtain concordant results-, and as the majority of oils have a saponification value of 193, excepting rape-seed oil and castor-oil, which are lower, it cannot be relied upon. It, however, is of value in determining the amount of liquid waxes in the presence of oils.
Gumming Test.
This test gives an indication of the amount of certain chang...es that may be expected in a mineral oil when in use. These resinified products, resulting from use, increase the friction of the revolving or rubbing surfaces.
It is also a measure of the amount that an oil will carbonize in a gas or gasoline engine cylinder. It is applied after the manner of the elaidin test, by thoroughly mixing together in a cordial glass 5 grams of the oil with 11 cc. of nitrosulphuric acid and keeping the mixture cooled in a pan of water at 10° to 15® C. Brownish spots or, in case of bacl oil, masses, form around the edges and become red in the course of two hours.
What to read after Examination of Lubricating Oils?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Bliss Stillman to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The saponification value of oils is often made use of for identi- fication ; but as this value varies with the age of the oil, it is ex- tremely difficult to obtain concordant results-, and as the majority of oils have a saponification value of 193, excepting rape-seed oil and castor-oil, which are lower, it cannot be relied upon. It, however, is of value in determining the amount of liquid waxes in the presence of oils.
Gumming Test.
This test gives an indication of the amount of certain chang...es that may be expected in a mineral oil when in use. These resinified products, resulting from use, increase the friction of the revolving or rubbing surfaces.
It is also a measure of the amount that an oil will carbonize in a gas or gasoline engine cylinder. It is applied after the manner of the elaidin test, by thoroughly mixing together in a cordial glass 5 grams of the oil with 11 cc. of nitrosulphuric acid and keeping the mixture cooled in a pan of water at 10° to 15® C. Brownish spots or, in case of bacl oil, masses, form around the edges and become red in the course of two hours.
What to read after Examination of Lubricating Oils?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Bliss Stillman to read onlineMoreLess
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