Round filters FP 551, black Recommended for the detection of very fine traces of light particles and precipitates. -The filter paper grade 551 is a technical filter paper made with the addition of black dye -White and light particles can be detected easily by the strong contrast to the black filter paper -Detection of very fine traces of white precipitates and particles -Detection of silicone/fluorine traces (water drop test) -Determination of the antiseptic e#ect of wood preservatives against fungal attack -Visualisation of mycelial threads from fungi
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