Purolite C100MRNS is Sodium Polystyrene Sulphonate, a strong acid cation ion exchange resin powder. This is a pharmaceutical grade product which is used for the treatment of a specific medical condition. In certain cases there can be a build up of potassium in the bloodstream which is not removed by the kidneys. The function of the resin is to reduce and control, where necessary, the potassium levels within the body. 

The Purolite C100MRNS fully complies with the U.S.Pharmacopeia where it is listed under the name Sodium Polystyrene Sulphonate. Alternatively it is available in the calcium form as Purolite C100CaMRNS. The product is being manufactured without the use of solvents.

Principal Applications

  • Potassium control


  • Excellent chemical and physical stability
  • Secure, validated supply and regulatory support

Regulatory Approvals

  • Kosher
  • Manufactured under cGMP conditions
  • TSE/BSE/GMO free
  • Compliant with FDA regulation 21 CFR 173.28
  • Pharmacopeia compliant

Typical Packaging

  • Medium drum (fiber)
  • Large drum (fiber)

Typical Physical & Chemical Characteristics:

Polymer Structure Crosslinked gel polystyrene
Appearance Odorless buff powder
Functional Group Sulfonic acid
Ionic Form Na+
Moisture uptake (max.) 46 - 54 %
Moisture Content (max.) 10 %
Total Aerobes <100 cfu/g
Total Moulds <10 cfu/g
Total Yeasts <10 cfu/g
Mean Size Typical <150 µm
Others (Staphylococcus aureus, Pseudomonas aeruginosa, Enterobacteria) ND
iron content (max.) 100 ppm
Lead content (max.) 10 ppm
Sodium content (dry weight) 9.4 - 11 %
Residual calcium (max.) 0.1 %
Residual potassium (max.) 0.1 %
Potassium exchange capacity 110 - 135 mg/ dry g (potassium form)