Standard Test Methods for Determination of Gel Content and Swell Ratio of Crosslinked Ethylene Plastics

Importancia y uso:

5.1 Many important properties of crosslinked ethylene plastics vary with the gel content. Hence, determination of the gel content provides a means of both controlling the process and rating the quality of finished products.

5.2 Extraction tests permit verification of the proper gel content of any given crosslinked ethylene plastic and they also permit comparison between different crosslinked ethylene plastics, including those containing fillers, provided that, for the latter, the following conditions are met:

5.2.1 The filler is not soluble in either decahydronaphthalene or xylenes at the extraction temperature.

5.2.2 The amount of filler present in the compound either is known or will be determined by other means.

5.2.3 Sufficient crosslinking has been achieved to prevent migration of filler during the extraction. Usually it has been found that, at extraction levels up to 50 %, the extractant remains clear and free of filler.

5.3 A suitable antioxidant is added to the extractant to inhibit possible oxidative degradation at the extraction temperatures.

5.4 Before proceeding with this test method, reference shall be made to the specification of the material being tested. 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. If there are no material specifications, then the default conditions apply.

Subcomité:

D20.15

Referida por:

F2905_F2905M-24A, F2968_F2968M-24, D2656-20, F1960-24, D2655-23, F2565-21, F2805-16R22, F2818-10R23, F3534_F3534M-22, F3597-23, F2854-21, F1281-24, F3203-19R23, F3253-24, F2788_F2788M-24, F0876-24A, F2759-19, D3555-20E01, D2647-18R24, F3378_F3378M-22, F3288_F3288M-20R24, F2929-17R21

Volúmen:

08.01

Número ICS:

83.080.20 (Thermoplastic materials)

Palabras clave:

crosslinked ethylene plastics; gel content; insoluble fraction; swell ratio;