FED-STD-791 Lubricants, Liquid Fuels, And Related Products, Testing Method OfThis test method standard is composed of standard test methods for sampling, inspecting and testing lubricants, liquid fuels and related products. It is issued pursuant to the Federal Property and Administration Services Act of 1949, as amended and its application to the purchase of commodities referred to herein is mandatory on all Federal agencies.

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'�NOTE:This draft dated 15 April 2006' by DasH - Page 106 of 460

FED-STD-791D

Method 3110.1

September 30, 1986

FATTY OIL IN CUTTING FLUIDS BY INFRARED SPECTROPHOTOMETRY

1. SCOPE

1.1 This method of analysis is intended for the determination of fatty oil in sulfurized

fatty mineral and sulfurized, chlorinated fatty mineral cutting fluids. The method is based on the

assumption that the fatty oil will consist entirely of lard oil. The method is not applicable to the

fatty oil analysis of cutting oils which contain oxidized oils or compounds containing carbonyl

groups which also absorb at 1743 cm-1, the point in the spectrum upon which this analysis is

based. Sulfur- and chlorine-containing compounds which often interfere with the conventional

fatty oil analysis do not interfere with this method.

2. SUMMARY

2.1 The total concentration of fatty oil in a cutting fluid is determined by measuring the

absorbance at the carbonyl absorption band at 1743 cm-1 by

means of infrared

spectrophotometry. A curve showing the relationship between fatty oil content and absorbance

at 1743 cm-1 is used to determine the percent of fatty oil in the cutting fluid.

3. SAMPLE SIZE

3.1 Approximately 100 mL of the oil to be tested.

4. REFERENCES, STANDARDS, AND APPARATUS

4.1 An infrared spectrophotometer capable of producing a distinct carbonyl absorption

band at 1743 cm-1. The Perkin-Elmer Infrared Spectrophotometer, Model 621, has been found

satisfactory. A sealed liquid cell with sodium chloride or potassium bromide windows may be

used. It is recommended that the path length used be approximately 0.025 mm.

5. MATERIALS

5.1 CAUTION - SOME MATERIALS ARE TOXIC AND HAZARDOUS. The

chemical materials listed in this section must be handled carefully. Federal Test Method 10000,

Material Handling Safety Precautions, is a reference which lists all toxic and hazardous materials

cited in FTMS 791. The synonyms, life hazard, flammability, handling and storage precautions,

emergency treatment and measures, and spill practices of each chemical are explained.

5.2 Spectrophotometric standards of A-A-59197 Fatty Oil in 0.0-15% Mineral Oil.

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