Filtration

The filtration is the mechanism by means of which particles are catched in the surface of the filter whose size is greater than the size of the pore. The particles of the size smaller than the specific one the pore cross the filter or can remain retained in the interior by means of some other mechanism.

 

Size of the Pore in the Filter Plates

The size of the pore of a filter is identified by the diameter of the particle that hopes that it is going to retain with high and defined degree of effectiveness. Usually they are express in micrometers (µm) - also known as microns - and make reference to the size of the particle or the micro-organism retained by the filter with a specific degree of effectiveness.

 

Pore Size Depending on Use

The porosity indicates the pore size according to the filters used.

This value is used as the last 2 digits of the references of all articles marked.

 

Filter Plates

Image	Porosity	Pore Size (μm)	Use
	0	160 - 250	Gas distribution in liquids to low, great particle filtration, heavy filtration.
	1	100 - 160	Heavy filtration, gas distribution, distribution of liquids, gas washing
	2	40 - 100	Fine filtration, preparatory filtration mercury, work with crystalline, heavy products
	3	16 - 40	Analytical work with average analytical filtration of precipitated fine, gas filtration, special filtration
	4	10 - 16	Fine analytical filtration, hasty preparatory and analytical works with but fine ones
	5	1.0 - 1.6	General filtration of bacteria, sterile filtration

 

Recommendations in the Use of Filter Plates

 

1. Before the First Use

   Before being used for the first time, is advisable to put through suction, hydrochlorate acid or nitric acid i warm up, and to later wash them with abundant distilled water.

   Immediately after being washed many hasty carefully they can be eliminated of the filter doing to pass a water obstacle in sense in opposition to the one of filtration. When the filters obstruct by dust or dirt usually they clean easily with hot solution of a detergent.

    

2. Never Use for Cleaning

   the sulfocrómica mixture tends to obstruct of permanet form pores of the glass filters.

   Never to be used in the cleaning of the filters hot solutions of hyfrofluoric acid (HF), hot concentrated of phosphoric acid (H3PO4) as well as hot concentrated alkaline solutions. If these products have to be filtered, a widening of pores of the filter will not be able to be avoided.