5.1 Vapor pressure is a very important physical property of volatile liquids.
5.2 The vapor pressure of gasoline and gasoline-oxygenate blends is regulated by various government agencies.
5.3 Specifications for volatile petroleum products generally include vapor pressure limits to ensure products of suitable volatility performance.
5.4 This test method is more precise than Test Method D4953, uses a small sample size (18201;mL to 10 mL), and requires about 7 min to complete the test.
1.1 This test method covers the use of automated vapor pressure instruments to determine the total vapor pressure exerted in vacuum by air-containing, volatile, liquid petroleum products, including automotive spark-ignition fuels with or without oxygenates (see Note 1). This test method is suitable for testing samples with boiling points above 08201;°C (328201;°F) that exert a vapor pressure between 78201;kPa and 130 kPa (1.08201;psi and 18.68201;psi) at 37.88201;°C (1008201;°F) at a vapor-to-liquid ratio of 4:1. Measurements are made on liquid sample sizes in the range from 18201;mL to 10 mL. No account is made for dissolved water in the sample.
1.1.1 Some gasoline-oxygenate blends may show a haze when cooled to 08201;°C to 18201;°C. If a haze is observed in 8.5, it shall be indicated in the reporting of results. The precision and bias statements for hazy samples have not been determined (see Note 15).
1.2 This test method is suitable for calculation of the dry vapor pressure equivalent (DVPE) of gasoline and gasoline-oxygenate blends by means of a correlation equation (see Eq 1 in 14.2). The calculated DVPE very closely approximates the dry vapor pressure that would be obtained on the same material when tested by Test Method D4953.
1.3 The values stated in SI units are regarded as standard. The inch-pound units given in parentheses are provided for information only.