ASTM D2765 PDF

ASTM D STANDARD TEST METHODS FOR DETERMINATION OF GEL CONTENT AND SWELL RATIO OF CROSSLINKED ETHYLENE PLASTICS. Differential Scanning. Calorimetry (ASTM. D). Dilute Solution. Viscometry ( ASTM. D, F). Fatigue (ASTM E). Swelling Analysis. (ASTM D). Tue, 30 Oct GMT astm d standard test methods pdf – Test. Method B differs from the referee test method only in sample preparation; that is.

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Low values of awtm extract indicate a high degree of crosslinking. The swell ratio and percent extract are calculated from these weight measurements. NOTE 3—Since most of the extraction occurs within less than the speci? Provided f2765 no chemical degradation occurs, 5 the lower the swell ratio the greater the crosslinking and the lower the molecular weight between crosslinks.

Hence, determination of the gel content provides a means of both controlling the process and rating the quality of? Specific precautionary statements are given in Sections 69and Check the effectiveness of the hood before starting the tests.

L—mesh wire cage containing the specimen. E—Specimen for solvent extraction shaded area. Low swell ratios indicate a more tightly bound structure. The extraction thimble assembly rests upon the mm portion of the thimble previously cut off, the latter inserted into the modi?

Excessive inhalation of the vapors may cause dizziness or headache, or both. In the event of excessive inhalation, seek fresh clean air.

Users of this standard are expressly advised that sstm of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Test Method B differs from the referee test method only in sample preparation; that is, it requires use of shavings taken at selected points in cable insulation, for example, rather than the ground sample required by the referee test method.

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For referee tests, extraction time is to be as speci? Hence, determination of the gel content provides a means of both controlling d2675 process and rating the quality of finished products.

Combining values from the two systems may result in non-conformance with the standard.

Suspend the cage and specimen in the solvent so that the bottom edge of the cage is almost touching the bottom of the? A number in parentheses indicates the year of last reapproval.

ASTM D2765 – 16

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The transfer of the test specimen should be made quickly. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

If there are no material specifications, then the default conditions apply. Use only in a ventilated hood. In case of excessive inhalation, seek fresh clean air. However, this test method permits swell ratio to be determined.

The inch-pound units in brackets are for information only. Blow the surfaces Note Last previous edition approved in as D — Current edition approved April 1, Close the pouch by folding over the open side and stapling it to form a cage. If there are no material speci? The methods described herein are applicable to crosslinked ethylene plastics of all densities, including those containing fillers, and all provide corrections for the inert fillers present in some of those compounds.

Reagents and Materials Cool cold trap with dry ice and acetone to catch and condense xylene vapor. Warning—The following explanations of r and R For each material, all the samples were prepared at one source, but the individual specimens were prepared at the laboratory that tested them.

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April 1, 1 Reapproved without revision.

ASTM.D Determination of Gel content and swell ratio of crosslinked ethylene plastics_百度文库

Wd density of solvent at the immersion temperature volume of solvent in gel Wg? However, if there is any doubt about the values obtained with reused extractant, the test should be repeated with fresh extractant. Fold this to form a square measuring approximately 40 mm [11? Any test specimen preparation, conditioning, dimensions, or testing parameters, or a combination thereof, covered in the materials specification shall take precedence over those mentioned in this test method.

Fold over the open side of the pouch and staple the edge to form a cage. In high-voltage cable employing strand shielding tapes or compounds, the strip should be shaved as closely as possible along the shielded surface, being careful not to include any of the semiconducting compound see Fig.

If the system is? Each test result was the result of one individual determination. The outer sections of this strip are discarded, thus leaving only a sample of the material closest to the conductor or shielded surface. Results obtained from such specimens are of limited value.

It is not equivalent to ISO in any other measurement or section. Such extraction test methods are described herein. Fold two sides of this square closed by folding the cloth at the edges about 6 to 7 mm [1?

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