ASTM D2765-16,Standard Test Methods for Determination of Gel Content and Swell Ratio of Crosslinked Ethylene Plastics.ASTM D2765-16 pdf download.
The gel content (insoluble fraction) produced in ethylene plastics by crosslinking is determined by extracting with solvents such as decahydronaphthalene or xylenes. 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.
4. Summary of Test Methods
4.1 Specimens of the crosslinked ethylene plastic are weighed and then immersed in the extracting solvent at the temperature specified by the procedure selected and for the time designated by that procedure. After extraction, the speci mens are removed. dried. and reweighed as directed. The amount of material extracted is calculated and if desired. swell ratio determined by the means described in alternative Test Method C.
6. Precautions
6.1 This test method measures a much larger three dimensional polymer network and is different than that mea- sured by Test Method D3351.
6.2 It has been reported that ultra-high molecular weight polyethylene fails to completely dissolve in this procedure at times.
6.3 Atmospheric pressure affects the boiling temperature of solvents. It is possible that laboratories performing these test methods at altitudes greater than 1500 m(5000 ft) above level will observe lower boiling temperatures for the solvent used. If this is observed it shall be noted in the results report.
14. 1 This modification of the referee test method was leveloped particularly for wire and cable insulations and differs from the referee test method only in specimen preparation.
14. 2 In using this alternative test method, it is recognized that the values obtained at times, are lower than those obtained by referee Test Method A for the reason given in 1.2.

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