Many of the products in the DWK Life Sciences ranges of filtration glassware utilise sintered (fritted) discs manufactured from 3.3 expansion borosilicate glass. Since they are manufactured from this type of glass they are resistant to the majority of corrosive reagents, unaffected by ammonia, sulphuric acid and other solvents that are damaging to filter paper. The sintered glassware is available in six porosity classes from 0 – 5, as outlined in the table below. The pore sizes indicated, give a range of pores present within the sinter disc. Therefore, the size of particles that will be obstructed will generally be of a size at the upper end of the range.
|Porosity Grade||ISO 4793 designation||Pore Index (mic.)||Principal Uses|
|0||P250||160-250||Coarse filtration, gas dispersion and as a support for other filter material|
|1||P160||100-160||Coarse precipitate filtration, gas dispersion, coarse grain material filtration|
|2||P100||40-100||Medium and crystalline precipitate filtration, medium filtration and washing of gases|
|3||P40||16-40||Analytical work with medium precipitates|
|4||P16||10-16||Analytical work with fine precipitates|