Büchner funnel with straight sides, two interlocking parts and a perforated filter plate is made of high quality polypropylene For use in filtration (separation of solid matter and fluid) - Two parts combine forming a vacuum seal which does not require greasing Filtration paper required but NOT included - Best with 11 to 12.5cm filter paper - Moisten filter paper with a liquid to prevent initial leakage Funnel stem measures 85mm (3.3 inches) with an inner diameter of 20mm (0.8 inches) - Fully assembled funnel measures 210mm (8.25 inches) in length with an inner diameter of 130mm (5.1 inches) Often used in combination with a Büchner flask (CH0422C01), Büchner ring and sinter seals Polypropylene plastic Büchner Funnel is both light weight and autoclavable. The funnel is in two parts; the top portion can be fitted with the lower one, forming a vacuum seal which does not require greasing. Base of top portion has a perforated filter plate. Designed for filter paper from 11cm to 12.5cm diameter (not included). Measurements: Mouth inner diameter: 130mm Assembled length: 210mm Stem length: 85mm Stem inner diameter: 20mm