Recommended for quantitative analyses to determine low content in phosphates and nitrogen according to Kjeldahl respectively.

• Filter paper made from carefully selected raw materials
   
• Particularly for the determination of alkaline earth metals and trace elements in soil analysis
   
• Type 512: Extremely low content in Phosphor (approx. 2 ppm P2O5)
   
• Type 0790: Very low content of Phosphor and Magnesium (approx. 2 ppm Mg)

Filtration of precipitates in preparations for the determination of Nitrogen by Kjeldhal.

• Type 2095: Extremely low content of nitrogen, approx. 0.05 mg / 110 mm disc. 
   

These grades are available as filter circles with the following sizes as standard (in mm):

55 – 70 – 90 – 110 – 125 – 150 – 185 – 240 – 320 (folded filters from 70 mm). 

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