Borosil 3606920 - 200 ml Buncher Funnel With Sintered Disc is used for filtration of liquids and gases in the laboratory. It has a non-corrosive and reusable porous glass disc as the filter media. It is also used for gas washing, dispersion and absorption.The Sintered Disc is manufactured by crushing Borosil glass, and then powdering, cleaning and separating it into various mesh sizes, and finally, fusing it together in the form of a Disc. Sintered Discs are classified into 5 grades - G1, G2, G3, G4 and G5. The grades are defined in terms of the maximum pore size that is obtained by • Made of 3.3 borosilicate glass• Especially useful where the filter paper may be attacked by filtered material• Generally used in qualitative inorganic analysis and preparative chemistry• Resistant to corrosion and heat measuring the pressure at which the first air bubble breaks away from the filter, under specified conditions. The pressure differential is then used to calculate the equivalent capillary diameters in microns. The desired pore size is obtained by controlling the grain size, firing time, temperature and thickness of the Disc. Each Disc is tested and graded individually.The pore diameters are reasonably uniform, which ensures the required flow rate through the filter. The flow rate further depends on the pressure differential between the two sides of the Disc, the free area of the Disc, viscosity of the fluid being filtered, and other factors. There is a fair amount of uniformity in the pore size of different Discs of the same size and grade. Hence, the results from two or more Discs of the same size and grade will be uniform, thereby ensuring reproducible analytical results. Available on EnvMart, these Laboratory Glasswares are crafted from high-quality materials using advanced techniques to ensure precision and durability. Borosil Glasswares are trusted for their accuracy and reliability, making them a preferred choice in laboratories for various scientific applications.