ASTM D1807电绝缘液体折射指数和比光散度的标准试验方法
日期:2012-02-08 17:11
nsulating mineral oils, the wavelength of 5893 ˚A for the spectral line of sodium is commonly used. The test temperature is 25C.
Specific Optical DispersionSpecific optical dispersion serves as a quick index to the amount of unsaturated compounds present in an oil. Dispersion values for paraffinic and naphthenic compounds are nearly the same and are essentially independent of molecular weight and structural differences. Values above 97 bear a direct relationship to the amount of aromatic compou
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09/11 11:25