5 Apparatus5.1 Electric Furnace, at least 20 cm (7.9 in.) long suitable for use with the tubing described in 5.2.5.2 High Temperature Glass Combustion Tube, 4 of appropriate diameter and approximately twice as long as the furnace described in 5.1.5.3 Stoppers—Two rubber or neoprene stoppers, to fit the tube described in 5.2, unless the tube … Continue reading ASTM D 1603 Carbon Black Content in Olefin Plastics / Testing Equipment