ASTM D612-88 pdf free

04-13-2021 comment

ASTM D612-88 pdf free.Standard Test Method for Carbonizable Substances in Paraffin Wax.
Reagent grade chemicals shall beused in all tests. Unless otherwise indicated, it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.5 Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.
Unless otherwise indicated, referencesto water shall be understood to mean distilled water, such as reagent water corresponding to Specification D 1193, Type III,or water of equal purity.
After the test tube has been in the water bath for 5 min,loosen the stopper sufficiently to release any pressure andreinsert, remove the test tube from the bath quickly, hold witha finger over the stopper,and give three vigorous,verticalshakes over an amplitude of about 5 in. (127 mm), shaking thetest tube quickly and at a rate corresponding to 5 shakes/s.Repeat every minute.Do not keep the test tube out of the bathlonger than 3 s for each shaking period.
At the end of 10 min from the time the test tube was firstplaced in the bath, remove the test tube, immediately place it inthe color comparator, and compare the acid layer with 5 mL ofthe standard colorimetric solution and 5 mL of white mineraloil in a test tube that has been shaken vigorously for 10 s andallowed to stand just long enough for the contents to separateinto two layers.In some cases the acid remains trapped with the wax asan emulsion,and no lower layer is obtained to compare withthe standard colorimetric solution. When this occurs,comparethe emulsion with the standard colorimetric solution and white mineral oil shaken vigorously to give a similar emulsion, andwithout waiting for the two liquids to separate.
Paraffin wax shall be reported as passing the testwhenthe acid layer is not darker than the reference standardcolorimetric solution or,if completely emulsified,when theemulsion is not darker than a similar emulsion produced byvigorously shaking the reference standard colorimetric solutionwith white mineral oil in equal proportions.
If the acid layer is darker than the reference standardcolorimetric solution, or if the emulsified paraflin wax and acidare darker than a similar emulsion of the reference standardcolorimetric solution and white mineral oil in equal proportions, the paraffin wax shall be reported as not passing the test.ASTM D612 pdf download.

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