FED-STD-791D
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 Engine crankcase oil.
6. PROCEDURES
6.1 DEFINITIONS
6.1.1 Pour Stability Temperature - That specified temperature at which an oil remains
fluid on completion of an established temperature/time cycle. See 6.2.8.
6.1.2 Stable Pour Point - The lowest temperature at which an oil remains fluid when
subjected to an established temperature/time cycle. See 6.2.9.
6.2 Test procedures.
6.2.1 Adjust cooling bath temperature to +15C with one temperature sensing bulb in the
cooling medium.
6.2.2 Prepare two temperature measurement samples as follows:
6.2.2.1 Select a sample oil which is known to be fluid below the lowest temperature
SAE Grade to be tested.
6.2.2.2 Fill each of two test jars with approximately 40 mL of selected oil sample.
Identify these bottles as "Temperature Measurement Sample".
6.2.2.3
Prepare cork stopper to accommodate the standardized calibrated ASTM
thermometer.
6.2.2.4 Insert stopper and thermometer into one jar so that thermometer immersion line
is visible but not more than 0.3 cm above top of stopper. Place jar in center of cooling bath.
6.2.2.5 Prepare cork stopper to accommodate recorded temperature sensing bulb.
6.2.2.6 Insert stopper and one temperature sensing bulb in the second jar and position the
bulb approximately 0.5 cm into the control oil sample. Place jar in center of cooling bath next to
jar with thermometer.
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