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4.1 This practice provides information on the recommended uses and application temperatures for the various grades of road tar used in the construction and maintenance of pavements.1.1 This practice covers the selection and application temperatures of road tar grades in the construction and maintenance of pavements.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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1.1 This test method covers two procedures for the determination of insulation resistance and volume resistivity of ceramic insulating materials at elevated temperatures between 100 and 500°C. 1.1.1 Procedure A is suitable for obtaining a curve of the resistance versus temperature characteristics of a single specimen over a wide temperature range. 1.1.2 Procedure B is more suitable for rapid testing of large numbers of specimens at a fixed temperature. 1.2 These properties shall be determined in accordance with Test Methods D257, except that the special procedures described in this method shall be used. 1.3 The values stated in inch-pound units are to be regarded as standard. 1.4 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are found in Section 7.

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The lowest temperature at which aviation fuels remain free of solid hydrocarbon crystals, which may restrict the flow of fuel through filters in an aircraft fuel system, is a key safety parameter in the specification and use of fuels. In Test Method D 2386, the freezing point is defined as the temperature at which all crystals disappear following a cooling and warming cycle. In this test method, a cooling and warming cycle is also employed; however, the test result is defined as the flow point, which is the temperature of the specimen at which a test filter becomes unblocked on warming.1.1 This test method covers the determination of low temperature flow behavior, through a screen-type test filter, of aviation turbine fuels, which can contain separated solids as wax.1.2 Procedure A employs a 26-μm test filter and is the recommended procedure. Some existing instruments are fitted with a 42-μm filter, and Procedure B is retained to enable their continued use.1.3 The use of Procedure A (26-μm test filter) with fuels that have a viscosity of greater than 5.0 mm2/s (cSt) at -20°C, as determined by Test Method D 445, can affect the precision and the simulated freezing point obtained on such fuels and can give a higher (warmer) result than the conventional freezing point obtained by Test Method D 2386.Note 1—The principle of this test method relies on flow through a fine-mesh test filter, and, hence, the result can be affected by the viscosity of the sample. When using Procedure A, a no-flow condition is reached when crystals block the test filter or the viscosity exceeds about 14 mm2/s (cSt); sample with a viscosity of greater than 5 mm2/s (cSt) at -20°C may exceed the 14-mm2/s (cSt) threshold at a temperature before crystals are formed. If viscosity affects the result before crystals are formed, then the reported value of the no-flow temperature of the sample will always be warmer than the actual freezing point, and therefore fail-safe and an indicator of possible flow anomalies at low temperature.1.4 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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1.1 This test method describes an accelerated procedure for determining comparative characteristics of coating systems applied to the exterior of steel pipe for the purpose of preventing or mitigating corrosion that may occur in underground or immersion where the pipe is carrying heated media and is under cathodic protection. This test method is intended for use with samples of coated pipe, or with a specimen cut from the section of coated pipe or flat plates, and is applicable to such samples when the coating is characterized by function as an electrical barrier.1.2 This test method is intended to simulate conditions when external coatings are exposed to high temperature inside the pipe and to an ambient temperature outside, and thus are subjected to temperature gradient. If elevated temperatures are not required, see Test Method G8. If a specific test method is required with no options, see Test Method G80. If elevated temperatures are required but without temperature gradient, see Test Method G42.1.3 The values stated in SI units to three significant decimals are to be regarded as the standard. The values given in parentheses are for information only.1.4 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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1.1 This specification covers gray iron for castings suitable for pressure-containing parts for use at temperatures up to 350°C.1.2 Castings of all classes are suitable for use up to 230°C. For temperatures above 230°C and up to 350°C, only Class 275, 300, 325, 350, 380, and 415 castings are suitable.1.3 This specification is the SI companion to Specification A278.

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