A High Capacity Cation Exchange Resin for Softening &emineralization Applications

Product Type Matrix Funtional group
DOWEX* HCR-S Strong acid cation Styrene-DVB, gel Sulfonic acid
Guaranteed Sales Specifications Na+ form H+ form
Total exchange capacity, min. eq/I 2.0 1.8
kgr/ft3as CaCO3 43.7 39.3
Bead size distribution range+ 0.3 mm – 1.2 mm, min. % 90 90
(50 mesh – 16 mesh)
Acidity Range pH 7.0 – 9.5 -
Color Throw, as packaged, max. APHA 20 -
Typical Physical and Chemical Properties Na+ form H+ form
Water content % 44-48 50-56
Whole uncracked beads % 90-100 90-100
Total swelling (Na+ H+) % 8 8
Particle density g/ml 1.28 1.22
Shipping weight g/l 820 780
Ibs/ft3 51 49
Recommended Operating Conditions
Maximum operating temperature 120°C (250°F)
pH range 0-14
Bed depth, min. 800 mm (2.6 ft)
Flow rates:
Service/fast rinse 5-50 m/h (2-20 gpm/ft2)
Backwash See figure 1
Co-current regeneration/displacement rinse 1-10 m/h (0.4-4 gpm/ft2)
Total rinse requirement 3-6 Bed volumes
Regenerant 1-8% H2SO4, 4-8% HCI or 8-12% NaCI

+For additional particle size information, please refer to the Particle Size Distribution Cross
Reference Chart (Form No. 177-01775/CH 171-476-E).

*Trademark of The Dow Chemical Company

Typical properties and applications:

DOWEX* HCR-S cation exchange resin is a high capacity resin with excellent kinetics and good physical, chemical, and thermal stability.DOWEX HCR-S cation exchange resin is well suited for industrial water softening and demineralization in the co-current mode of regeneration.


25 liter bags or 5 cubic feet fiber drums.

Figure 1. Backwash Expansion Data
Temperature = 25° C (77° F)

For other temperatures use:

FT = F77°F [1+ 0.008 (T°F -77)], where F = gpm/ft2
FT = Fz5°C [1+ 0.008 (1.8T°C - 45)], where F = m/h

Figure 2. Pressure Drop Data
Temperature = 20° C (68° F)

For other temperatures use:

PT = P2o°c / (0.026 T°c + 0.48), where P – bar/m
PT = P68°F / (0.014 T°F + 0.05), where P = psi/ft

Warning: Oxidizing agents such as nitric acid attack organic ion exchange resins under certain conditions. This could lead to anything from slight resin degradation to a violent exothermic reaction (explosion). Before using strong oxidizing agents, consult sources knowledgeable in handling such materials.

Notice: No freedom from any patent owned by Seller or others is to be inferred. Because use conditions and applicable laws may differ from one location to another and may change with time, Customer is responsible for determining whether products and the information in this document are appropriate for Customer’s use and for ensuring that Customer’s workplace and disposal practices are in compliance with applicable laws and other governmental enactments. Seller assumes no obligation or liability for the information in this document. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED.
Published September 1998.