1.1 This test method covers the determination of the total methyl hydrogen content of unadditized base stock (lubricating oils) hydrocarbon oils using high-resolution nuclear magnetic resonance (NMR) spectrometers that are completely soluble in chloroform at ambient temperature. 1.2 The reported units are mole percent methyl hydrogen atoms. For pulse Fourier transform (FT) spectrometers, the detection limit is typically 0.1 % mol hydrogen atoms. The interim precision is applicable in the range 20.5 to 38.7 % mol hydrogen.
Keywordsmethyl hydrogen content; continuous wave; Fourier transform; hydrocarbon oils; lubricant base stocks; NMR; nuclear:magnetic resonance spectroscopy
This is a new test method using H-NMR technique to determine the methyl hydrogen content which is a characteristic likely applicable for base oil interchange.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Frank Di Sanzo
Draft Under Development