Posts tagged 'filtering'

How to Choose the Right Filters for Your Fume Hood
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How to Choose the Right Filters for Your Fume Hood

Ductless fume hoods or fume cupboards are often used in laboratories to capture and remove hazardous substances from the air which are produced during certain laboratory applications. These can be gases, vapours, aerosols or particulates (dust). The fume hood encloses a work bench area that has a fan unit at the top. This sucks the air from the front opening upward through filters which trap th...
Vacuum Filtration
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What is the difference between gravity and vacuum filtration?

There are two types of filtration which are commonly used in the laboratory and it is important to select the correct type for the work you are doing. But what is the difference between gravity and vacuum filtration? How do you choose what type of filtration you need to do? And what equipment do you need for each type? Vacuum Filtration - also known as Buchner filtration - for when you nee...
Vacuum Filtration
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What equipment do I need to perform a vacuum filtration?

Filtration under vacuum, also known as Büchner filtration, is commonly used to isolate the solid precipitate from a solution. This technique is used in syntheses, for example when a reaction has yielded a solid, or in analyses including gravimetric analysis of suspended solids. Although performing the filtration is simple, several pieces of equipment are needed which must all fit together, so...
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Sintered disc or sintered frit filtration funnels - how to care for sintered discs? When to select a sintered disc funnel? What do sintered disc grades mean?

Vacuum filtrations using a Buchner flask and funnel with a vacuum pump are commonly used to isolate a solid of interest from a liquid. Most commonly a porcelain Buchner funnel with a filter paper placed on top is used, but in some instances a sintered disc funnel is more appropriate. But when would you select a sintered disc funnel? And how should a sintered disc filter funnel be cleaned ...
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What size filter paper do I need for my funnel?

How do you choose the right size filter paper for your funnel? Use the table below to see what size filter paper you should use Gravity filtration using a filter paper inside a filtration funnel is used to remove precipitates from a liquid. The remaining liquid is known as the filtrate. For standard shaped filter funnels where the walls are at 58 or 60° the table below shows the r...

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