No abstract

It was found that in cutting deep holes, with an increase in the temperature from 20 to 80°C, the content of harmful components: 9-and 2-methylanthracene, 3-methylphenanthrene, etc., in oil-based MR-3K coolant (CL) decreases by 15-25%, i.e., they enter the air of the working zone. The

The molecular composition of the oil-based lubricating-cooling liquid SP-4 has been studied by chromato-mass-spectrometry. The regular isoprenoids 2,6,10,14-tetramethyl pentadecane and 2,6,10,14-tetramethyl hexadecane have been detected in the liquid. It is suggested that in due course isoprenoids of the p-like structure will be detected in the high-boiling fractions of paraffinic crude oils.