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.

This grade is available as filter circle with the following sizes (in mm):

55 – 70 – 90 – 240.

Other sizes, sheets, rolls and special cuts are available on request.