QUICKFIT® conical filter funnels with sintered glass disc and ground-joint stem, manufactured from 3.3 expansion borosilicate glass in compliance with ISO 3585 (ASTM E-438 Type 1 Class A). Sintered glass discs comply with ISO 4793 and allow filtration without filter paper. Designed with an integral ground cone for direct connection to jointed Buchner flasks, offering high resistance to corrosive reagents including ammonia and concentrated sulphuric acid.