PYREX®, borosilicate glass 3.3.

• Very good chemical resistance
• High temperature resistance
• Minimal thermal expansion, giving relatively high resistance to temperature changes

These fritted disc funnels are used in preparative work or in making separations where it is necessary to wash the precipitate and redissolve with chemicals which would attack filter paper. Angle of the funnel body remove precipitate. Porosity is controlled in manufacture and discs are individually tested and graded into different classifications. Porosity for the pore diameter of the filter is according to ASTM E-128.