ASTM D7553-15 (R2021) pdf free download.Standard Test Method for Solubility of Asphalt Materials in N-Propyl Bromide.
1.1 This test method covers the determination of the degree of solubility in n-propyl bromide of asphalt materials. It is intended to be a replacement for Test Method D2042 specifying a solvent that, like trichloroethylene, is safe in that it has no flash point, and has similar soluhilizing characteristics to trichioroethylene. hut it is not considered to he an ozone depleter banned by the Kyoto Protocol.
Note 1—This method is not applicable to tars and their distillation residues or highly cracked petroleum products. For methods covering tars. pitches. and other highly cracked petroleum products. and the use of other solvents, see Test Methods D4. D2318, and D2764.
1.2 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
1.3 The values stated in SI units arc to be regarded as standard. No other units of measurement are included in his
standard.
9. Sample Preparation
9.1 If the sample is not fluid, heat to any convenient temperature. but in any case not more than 100 °C above the softening point. Normally the temperature at which this test is run is not critical, and it may be performed at the laboratory air temperature. For referee tests, however, the flask and sample in solution shall be placed in a water bath maintained at 38.0 ± 0.3 °C for 1 h before filtering.
10. Procedure
10.1 Note safety precautions in Section 7. Transfer approximately 2 g of the sample into a tared I 25-mL Erlenrneyer flask or other suitable container. Smaller sample sizes may be necessary if more than 0.5 % insoluble material is expected. Allow the sample to cool to ambient temperature and then determine the mass to the nearest I mg. Designate this mass as 13. Add 100 mL of the n-propyl bromide to the container in small portions with continuous agitation until all lumps disappear and no undissolved sample adheres to the container. Stopper the flask or otherwise cover the container and set aside for at least 15 mm (see Section 9).
10.2 Place the previously prepared and weighed crucible in the filtering tube. Wet the filter pad with a small portion of n-propyl bromide and decant the solution through the filter pad of the crucible with or without light suction as may be necessary. When the insoluble matter is appreciable, retain as much of it as possible in the container until the solution has drained through the mat. Wash the container with a small amount of solvent and, using a stream of solvent from a wash bottle, transfer all insoluble matter to the crucible. Use a “policeman” if necessary to remove any insoluble matter adhering to the container. Rinse the policeman and container thoroughly. Wash the insoluble matter in the crucible with solvent until the filtrate is substantially colorless, and then apply strong suction to remove the remaining solvent. Remove the crucible from the tube, wash the bottom free of any dissolved matter, and place the crucible on top of an oven or on a steam bath until all odor of the n-propyl bromide is removed (see safety precautions in Section 7). Place the crucible in an oven at 110 ± 5 °C for at least 20 mm. Cool the crucible in a desiccator for 30 ± 5 mm and determine its mass to the nearest 0.1 rng. Repeat the drying and weighing until constant mass (±0.3 mg) is obtained. Designate this mass as C.ASTM D7553 pdf download.