Filter paper
Filter paper
Filter paper (/ˈfɪltər ˈpeɪpər/) is a semi-permeable paper material which is used to separate fine solid particles from liquids or gases. The term originates from the Latin words 'filtrum' meaning 'felt, a piece of filtering wool' and 'papyrus', which was an early form of paper.
Usage
Filter paper is commonly used in laboratory settings to perform routine separation of suspensions, but it also has applications in the food industry, automotive industry, and in air and water purification systems. The paper is usually folded into a conical filter shape or used flat in a filter funnel.
Types
There are several types of filter paper, each with different properties and uses. These include qualitative filter paper, which is used for general applications and has a nominal particle retention of 11 µm, and quantitative filter paper, which is used for precise quantitative analysis and has a particle retention of 2.5 µm.
Manufacturing
Filter paper is typically made from pulp that has been treated to create a network of tiny fibers. The size and distribution of these fibers determine the paper's filtering properties. Some filter papers are treated with a weak acid to increase their wet strength.
Related terms
External links
- Medical encyclopedia article on Filter paper
- Wikipedia's article - Filter paper
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