More D The equilibrium boiling point indicates the temperature at which the sample will start to boil in a cooling system under equilibrium conditions at atmospheric pressure. This method requires the use of the following apparatuses: round-bottom, short-neck, heat-resistant glass flask; water-cooled, reflux, glass-tube type condenser; grit No. Specified amounts of the sample shall be boiled under equilibrium conditions at atmospheric pressure in the flask.
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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. The equilibriumboiling point indicates the temperature at which the sample willstart to boil in a cooling system under equilibrium conditions atatmospheric pressure. NOTE 1—Engine coolants may also be marketed in a ready-to-use form prediluted. This test procedure is applicable to diluted solutions as wellas to concentrates.
NOTE 2—The procedure for obtaining a representative test sample of acoolant solution that contains an antileak additive is found in Test MethodD The values given in parentheses are for informationonly.
It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Referenced Documents2. Summary of Test Method3. The temperature of the liquid corrected forbarometric pressure is the boiling point.
Apparatus see Fig. The flask is shown in Fig. For samples exhibiting heavy foam, moreboiling chips may be added. See Section 10, Precisionand Bias. The data presented in this paragraph is derived usingmercury-in-glass thermometers only.
Current edition approved March 1, Published March Originallyapproved in as D — 50 T. Last previous edition approved in asD — DOI: United States Preparation of Apparatus6. Make a sealaround the temperature measuring instrument with a shortpiece of rubber tubing or other suitable material. Support theglassware by a laboratory-type ring support and stand.
Thewhole assembly is held in place by a clamp. Connect thecooling water inlet and outlet tubes to the condenser. Heat strongly until boiling is reached and thenreduce heat input slowly until the required reflux rate isobtained. Adjust the rate of reflux over the next min periodto 1 to 2 drops of reflux per second. To obtain accurate results,it is important to carefully observe the specified reflux rate andmaintain the proper reflux rate for 2 min before reading thetemperature.
Use Table 1 todetermine the barometric correction. Precision and Bias ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.
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BTo be added in case barometric pressure is below mm; to be subtracted incase barometric pressure is above mm.