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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Hence, determination of the gel content provides a means of both controlling the process and rating the quality of finished products. Users of this test method should apply the principles outlined in Practice E to generate data speci?

The transfer of the test specimen should be made quickly. Each laboratory obtained three test results for each material. L—mesh wire cage containing the specimen. The extraction thimble, with extra-coarse fritted glass disk sealed in; Kontesmm d2675 diameter, mm height or equivalent height must subsequently be cut aastm 75 mm.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

E—Specimen for solvent extraction shaded area. Provided that no chemical degradation occurs, 5 the lower the swell ratio the greater the crosslinking and the lower the molecular weight between crosslinks.

The extraction thimble assembly rests upon the mm portion of the thimble previously cut off, the latter inserted into the modi? Low values of percent extract indicate a high degree of crosslinking.

The outer sections of this strip are discarded, thus leaving only a sample of the material closest to the conductor or shielded surface. We density of polymer at the immersion temperature volume of polymer in gel Wo? In d2756 event of excessive inhalation, seek fresh clean air.

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Check the effectiveness of the hood before starting the tests. 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. Reagents and Materials NOTE 4—It has been reported that drying time sometimes can be materially shortened if the cage and sample are cooled for 15 min and then are placed either on a suspended screen or on lint-free absorbent material to remove excess solvent before being put into the vacuum drying oven.

Last previous edition approved in as D wstm Low swell ratios indicate a more tightly bound structure.

NOTE 7—The solvent must cover the swollen test specimen at the conclusion of the immersion period to obtain reliable results. Excessive inhalation of the vapors may cause dizziness or headache, or both.

Such extraction test methods are described herein. Glass wool 13 to 19 mm thick [1? Weigh this pouch W1. Cool and weigh W4.

Weigh the pouch and specimen W2. D — 01 A—Identi? They have been particularly useful for electrical insulations since specimens may be selected from those portions of the insulation most susceptible to insufficient crosslinking. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Weigh the cage and sample W3.

Cool cold trap with dry ice and acetone to catch and condense xylene vapor. E—Ground-glass or cork joint. NOTE 6—If the fraction of? Wd density of solvent at the immersion temperature volume of solvent in gel Wg?

They have been particularly useful for electrical insulations since specimens may be selected from those portions of the insulation most susceptible to insufficient crosslinking. Handle the swollen test specimen gently and carefully. It is the responsibility of the user of this standard to establish 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 The swell ratio and percent extract are calculated from these weight measurements.

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If this is done, the time of extraction must be reported. Suspend the cage and specimen in the solvent so that the bottom edge of the cage is almost touching the bottom of the?

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

The principles of A superscript epsilon e indicates an editorial change since the last revision or reapproval. 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 c2765. They have been particularly useful for electrical insulations since specimens can be selected from those portions of the insulation most susceptible to insufficient crosslinking.

A small wire, attached to the cage and extending through the re? The fritted disk is extra-coarse with fused edge; Kontesmm diameter or equivalent. NOTE 5—If the modi?

ASTM D2765 – 16

NOTE 11—Derivation of calculations: The first of these differs from the referee test method only in sample preparation; that is, it requires use of shavings astk at selected points in cable insulation, for example, rather than the ground sample required by the referee test method.

A number in parentheses indicates the year of last reapproval. In that manner, a pouch open at the top is obtained. Close the pouch by folding over the open side and stapling it to form a cage. Use only in a ventilated hood. Fold this to form a square measuring approximately 40 mm [11?