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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Results obtained from such specimens are of limited value. Dd2765 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.
ASTM D2765 – 16
In the event of excessive inhalation, seek fresh clean air. Determination of the g Provided that no chemical degradation occurs, the greater the degree of crosslinking awtm lower the amount of extract lower percent extract. April 1, 1 Reapproved without revision.
The surfaces should not be subjected to excess blowing too long or more than once on each side ; otherwise more than the surface xylene will be removed. However, if there is any doubt about the values obtained with reused extractant, the test should be repeated with fresh extractant.
ASTM.D Determination of Gel content and swell ratio of crosslinked ethylene plastics_百度文库
Summary of 2d765 Method Handle the swollen test specimen gently and carefully. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Calculation See Note 11 for Derivation Increasing this period to 72 h had no signi? Originally approved in E—Ground-glass or cork joint. NOTE 10—Extreme care must be used in handling the swollen test specimen to obtain reliable results.
NOTE 8—The immersion period speci? Wd density of solvent at the immersion temperature volume of solvent in gel Wg? Do not inhale the vapors.
Excessive inhalation of the vapors may cause dizziness or headache, or both. NOTE 3—Since most of the extraction occurs within less than the speci? This sample asm is cut or asttm into pieces measuring approximately 6 by 6 mm [1? The transfer of the test specimen should be made quickly. Formulations containing low-density polyethylene usually require 24 h and those containing high-density polyethylene require 16 h to reach weight equilibrium. Such extraction test methods are described herein.
Shake this sieved material over a mesh sieve and reject any material that passes through. If you feel that your comments have not received a fair hearing you should make your views asrm to the ASTM Committee on Standards, at the address shown below. For several determinations at one time, but not exceeding six, a mL?
The principles of Low values of percent atm indicate a high degree of crosslinking. They have been particularly useful for electrical insulations since specimens may be selected from those portions of the insulation most susceptible to insufficient crosslinking.
In case of excessive inhalation, seek fresh clean air.
It is the responsibility of the user of this standard to ast, appropriate safety and health practices and determine the applica- 1 These test methods are under the jurisdiction of ASTM Committee D20 on Plastics and are the direct responsibility of Subcommittee D D — However, this test method permits swell ratio to be determined. Test specimens that break up during the immersion period usually very low degrees of crosslinking can be caught on a mesh or?
Specific precautionary statements are given in Sections 69and Fold two sides of this square closed by folding the cloth at the edges about 6 to 7 mm [1? They are applicable to crosslinked ethylene plastics of all densities, including those containing?
sstm D — 01 A—Identi? The test data in Table 1 should not be rigorously applied to acceptance or rejection of these materials, as those data are speci? The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Fold this to form a square measuring approximately 40 mm [11?
Both measurements are obtained in one test. Historical Version s – view previous versions of standard.
For Asfm 2 AWG and smaller, the dimensions should be proportionately less. The degree of crosslinking is not expressed as a percent of total crosslinkability or similar expression, but is judged from swell ratio and percent extract based on experience with the particular polymer-solvent system under consideration.
If this is done, the time of extraction must be reported. The fritted disk is extra-coarse with fused edge; Kontesmm diameter or equivalent. The inch-pound units in parentheses are for information only. Check the effectiveness of the hood before starting the tests. NOTE 9—The size of the swollen test specimen dictates the size of the weighing bottle to be used.