PYREX® Hirsch Funnels
These Corning PYREX® Hirsch funnels are available in a variety of sizes and are fitted with either a course, medium or fine porosity fritted disc. The fritted disc Hirsch filtering funnel is very useful in preparative work, or in making separations where it is necessary to wash the precipitate and redissolve with chemicals which would attack filter paper. The angle of the Hirsch funnel body facilitates the removal of precipitates. Porosity is controlled in manufacture, and the disc is individually tested and graded into these classifications. The porosity for the pore diameter of the hirsch funnel filtering disc is determined in the same manner as specified in ASTM E-128.