ASTM D619-99 pdf free.Standard Test Methods for Vulcanized Fibre Used for Electrical Insulation.
This test method has been used for many years, but noinformation has been presented to ASTM upon which to basea precision statement. No activity has been planned to developsuch information.
This test method has no bias because the value forpercentage of ash is determined solely in terms of this testmethod itself.
This test method is useful indetermining the continuity of quality of vulcanized fibre sheets,tubes, and rods and in providing a means of evaluating changesin the leaching medium and the efliciency of the leachingprocess.The test specimen shall consist ofapproximately 3 g of vulcanized fibre in the form of finelydivided particles, such as millings or filings.Procedure—(Warning—Both hydrochloric acid (HCI)and hydrofluoric acid (HF) are corrosive and toxic. Take careto avoid spillage and contact with the skin. Evaporate solutionsof these acids in a well-ventilated fume hood.) Dry the testspecimen for 1 h at 105 to 110°C.Transfer the dried specimento a crucible and slowly ignite it to constant weight. Wet theash with distilled water and transfer to a heat-resistant glassbeaker. Add about 75 mL of HCl (sp gr 1.19) and cover thebeaker with a watchglass.Evaporate the contents of the beakerto dryness.To the residue slowly add 10 mLof HCl(sp gr 1.19)followed by 75 mL of distilled water. Filter the mixture throughashless filter paper and wash with cold water, then with warmwater, until the filtrate is free of chlorides.Ignite the filter paperto constant weight in a weighed platinum crucible. Then add 4mL of HF(48 to 60 %) and apply heat until all white fumes aredriven off. Cool and weigh the crucible. The differencebetween this weight and the previous one indicates siliconpresent as silica. The results shall be expressed as a percentageof the weight of the dried specimen.For sheets less than /o in. (1.59 mm) inthickness, the pieces for the test specimen shall be 75 by 25mm by the thickness of the sheet; for sheets /6 in.and over inthickness, the pieces for the test specimen shall be 75 by 3 mmby the thickness of the sheet. The pieces shall be band-sawedor sheared from the sample so as to produce smooth edges freeof cracks.The sawed faces shall be sanded or filed to removeany protruding sections that might be broken off during thetest.The sample shall be sawed slowly so that the fibre is notheated appreciably.The thickness of the specimens shall bemeasured to the nearest 0.001 in. (0.025 mm) in the directionperpendicular to the natural faces of the original sample.ASTM D619 pdf download.