ASTM D6450-16a(R2021) pdf free download

ASTM D6450-16a(R2021) pdf free download.Standard Test Method for Flash Point by Continuously Closed Cup (CCCFP) Tester
1. Scope
1.1 This flash point test method is a dynamic method and depends on definite rates of temperature increase. It is one of the many flash point test methods available, and every flash point test method, including this one, is an empirical method. N OTE 1—Flash point values are not a constant physical-chemical property of materials tested. They are a function of the apparatus design, the condition of the apparatus used, and the operational procedure carried out. Flash point can therefore only be defined in terms of a standard test method, and no general valid correlation can be guaranteed between results obtained by different test methods or with test apparatus different from that specified. 1.2 This test method covers the determination of the flash point of fuel oils, lube oils, solvents, and other liquids by a continuously closed cup tester. The measurement is made on a test specimen of 1 mL. 1.3 This test method utilizes a closed but unsealed cup with air injected into the test chamber. 1.4 This test method is suitable for testing samples with a flash point from 10 °C to 250 °C. N OTE 2—Flash point determinations below 10 °C and above 250 °C can be performed; however, the precision has not been determined below and above these temperatures. 1.5 If the user’s specification requires a defined flash point method other than this test method, neither this test method nor any other method should be substituted for the prescribed method without obtaining comparative data and an agreement from the specifier. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. Temperatures are in degrees Celsius, and pressure is in kilo-pascals. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability of regulatory limitations prior to use.
4. Summary of Test Method
4.1 The lid of the test chamber is regulated to a temperature at least 18 °C below the expected flash point. A1 mL 6 0.1 mL test specimen of a sample is introduced into the sample cup, ensuring that both specimen and cup are at a temperature at least 18 °C below the expected flash point, cooling if neces- sary. The cup is then raised and pressed onto the lid ofspecified dimensions to form the continuously closed but unsealed test chamber with an overall volume of 4.0 mL 6 0.2 mL. 4.2 After closing the test chamber, the temperatures of the test specimen and the regulated lid are allowed to equilibrate to within 1 °C. Then the lid is heated at a prescribed, constant rate. For the flash tests, an arc of defined energy is discharged inside the test chamber at regular intervals. After each ignition, 1.5 mL 6 0.5 mL of air is introduced into the test chamber to provide the necessary oxygen for the next flash test. The pressure inside the continuously closed but unsealed test chamber remains at ambient barometric pressure, except for the short time during the air introduction and except at a flash point. 4.3 After each arc, the instantaneous pressure increase above the ambient barometric pressure inside the test chamber is monitored. When the pressure increase exceeds a defined threshold, the temperature at that point is recorded as the uncorrected flash point.
5. Significance and Use
5.1 The flash point temperature is one measure of the tendency of the test specimen to form a flammable mixture with air under controlled laboratory conditions. It is only one of a number of properties that must be considered in assessing the overall flammability hazard of a material. 5.2 Flash point is used in shipping and safety regulations to define flammable and combustible materials and classify them. This definition may vary from regulation to regulation. Consult the particular regulation involved for precise definitions of these classifications.