GLASS FILTRATION APPARATUS AND ACCESSORIES
Due to their high chemical and thermal shock resistance DURAN® filters and the corresponding filter plates are ideal for separations, e. g. with strong acids or alkalis. Thus they offer advantages in comparison with other materials such as plastic or paper. DURAN® filter products have a maximum operating temperature of +450 °C and are therefore far superior to other materials. The corresponding filtration vessels are specially optimised to the matching filtration apparatus and are vacuum-tight due to their special geometry and high wall thickness. This characteristic has been approved by the German TÜV and marked with the “GS”-indication. The glass filters are classified as being in porosity classes 0 to 5 according to their nominal maximum pore size. The following table shows the corresponding porosity range. The specified pore sizes always relate to the largest pore in the plate. This specification also characterises the minimum nominal size of particles which may be retained by the filtration.
Porosity table:
ISO 4793
Porosity
Nominal max. pore size µm
Areas of application
0 1 2 3 4 5
P 250 P 160 P 100 P 40 P 16 P 1.6
160 – 250 100 – 160 40 – 100 16 – 40 10 – 16 1.0 – 1.6
Gas distribution
Dispersion of gas in liquids Preparative fine filtration
Analytical filtration
Analytical fine filtration
Ultrafine filtration
ASTM E128-99
05
Porosity
Nominal max. pore size µm
Areas of application
EC Extra Coarse
170 – 220 40 – 60 10 – 16 4.0 – 5.5 2.0 – 2.5 0.9 – 1.4
Gas distribution
C
Coarse Medium
Dispersion of gas in liquids Preparative fine filtration
M
F
Fine
Analytical filtration
VF Very Fine UF Ultra Fine
Analytical fine filtration
Ultrafine filtration
Usage tips:
• The maximum permissible operating temperature is + 450°C. • Uniform heating is recommended to avoid thermal stresses and resultant breakages. • Heat glass filtration apparatus with disk diameters of more than 20 mm in initially cold ovens or sterilisers only. • The heating or cooling rate should not exceed 8°C/min. • When filtering hot substances observe the thermal shock resistance and, if necessary, preheat the filtration apparatus in a drying cabinet. • Wet filtration apparatus should be heated slowly up to + 80°C and dried for one hour before increasing the temperature further.
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