J-SCP Hirsch Filter Funnel White Porcelain 20 ml Capacity Top Outer Dia 55 mm, 194

J-SCP Hirsch Filter Funnel White Porcelain 20 ml Capacity Top Outer Dia 55 mm, 194 is a specialized piece of laboratory equipment used for the filtration of solids from liquids. Named after the German chemist Wilhelm Hirsch, this funnel features a unique design that allows for efficient filtration without the need for filter paper. It is particularly useful when dealing with small quantities of materials or when filter paper is not suitable due to chemical reactivity or potential sample loss.

The Hirsch filter funnel consists of a conical glass or plastic funnel with a porous glass or ceramic disc, often referred to as a "fritted disc," at the bottom. The fritted disc contains tiny pores that allow liquids to pass through while retaining solid particles. This disc eliminates the need for traditional filter paper, making it an excellent choice for materials that might interact with the paper or when precise recovery of solids is essential.

The filtration process using a Hirsch funnel involves the following steps:

Preparation: The Hirsch funnel is assembled, with the fritted disc securely in place at the bottom. The funnel is then attached to a vacuum source using a vacuum adapter or stopper.

Sample Loading: The mixture to be filtered is poured into the funnel. The vacuum source is turned on, creating a pressure differential that draws the liquid through the fritted disc while leaving the solid particles behind.

Filtrate Collection: The filtered liquid, known as the filtrate, is collected in a separate container placed below the funnel.

Solid Recovery: Once filtration is complete, the solid particles that remain on the fritted disc can be washed or further processed as needed.

Hirsch filter funnels are particularly advantageous in situations where traditional filter paper might disintegrate, react with the sample, or cause a loss of the filtered material. They are commonly used in various laboratory applications, such as separating crystals from solutions, collecting precipitates, isolating particles from suspensions, and performing air and water pollution analysis.

Care must be taken when using Hirsch filter funnels, as the fritted disc is delicate and can break if mishandled. Proper cleaning and maintenance are essential to ensure accurate and consistent filtration results.

In summary, a Hirsch filter funnel is a specialized filtration tool that offers an alternative to traditional filter paper-based filtration methods. Its fritted disc design provides efficient separation of solids from liquids while minimizing the risk of chemical interactions or sample loss, making it a valuable asset in laboratories dealing with a wide range of materials and applications.

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