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ASTM D97, Standard Test Method for Pour Point of Crude Oils. The specimen is cooled inside a cooling bath to allow the formation of paraffin wax crystals. At about 9 °C above the expected pour point, and for every subsequent 3 °C, the test jar is removed and tilted to check for surface movement.
The pour point (ASTM D97 [12]) measures the temperature at which a base oil no longer flows. For paraffinic base oils, pour points are usually between −12 °C and −15 °C, and are determined by operation of the dewaxing unit. The pour points of naphthenic base oils, generally devoid of wax content, may be much lower (down to <−70 °C). [10]
The pour point defined first this property of motor oil, as defined by ASTM D97 as "...an index of the lowest temperature of its utility..." for a given application, [ 12 ] but the cold-cranking simulator (CCS, see ASTM D5293-08) and mini-rotary viscometer (MRV, see ASTM D3829-02(2007), ASTM D4684-08) are today the properties required in motor ...
flash point (min) pour point (max) cetan number (min) viscosity (20 °C) Летнее дизельное топливо (summer diesel fuel) 860 kg/m 3: 62 °C –5 °C 45 3.0–6.0 mm²/s Зимнее дизельное топливо (winter diesel fuel) 840 kg/m 3: 40 °C –35 °C 45 1.8–5.0 mm²/s
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Pour point depressants are used to allow the use of petroleum based mineral oils at lower temperatures. The lowest temperature at which a fuel or oil will pour is called a pour point . Wax crystals, which form at lower temperatures, may interfere with lubrication of mechanical equipment.