Monosphere 650C UPW

Summary

Product identification

DOWEX™ MONOSPHERE™ 650C UPW (H) Uniform Particle Size Strong Acid Cation Resin for Single or Mixed Bed Demineralization for Ultrapure Water Applications

Description

DOWEX™ MONOSPHERE™ 650C UPW (H) is a uniform, high purity, strong acid cation exchange resin. It is recommended for:

• Roughing ion exchange loop in a 2-bed system followed by a mixed bed.
• Working mixed bed following reverse osmosis.

The dark color distinguishes it from light-colored DOWEX MONOSPHERE 550A anion resin, making it suitable for regenerable mixed beds. This UPW grade resin offers efficient rinse profiles to conductivity and (delta) TOC endpoints.

Typical Physical and Chemical Properties

• Physical form: Dark Amber translucent spherical beads
• Matrix: Styrene-DVB, gel
• Functional group: Sulfonic acid
• Ionic form as shipped: H⁺ form
• Total volume capacity, min.:
  • 2.0 eq/L
  • 43.7 kgr/ft³ as CaCO₃
• Moisture retention capacity: 46–51 %
• Harmonic mean diameter: 650 ± 50 µm
• Uniformity coefficient, max.: 1.1
• Whole uncracked beads, min.: 95 %
• Friability:
  • Average, min.: > 200 g/bead
  • % > 200 g/bead, min.: 95 %
• Particle density: 1.22 g/mL
• Shipping density:
  • 785 g/L
  • 49 lbs/ft³

Note: Shipping density is the backwashed and settled density determined by ASTM D-2187.

Suggested Operating Conditions

• Maximum operating temperature:
  • Single bed: 120ºC / 250ºF
  • Mixed bed: 60ºC / 140ºF
• Resin bed depth, min.:
  • Single bed: 800 mm (2.6 ft)
  • Mixed bed: 450 mm (1.5 ft)
• Flow rates:
  • Service/fast rinse: 10–60 m/h (4–24 gpm/ft²)
  • Backwash: See Figure 1
  • Regeneration/displacement: 4–10 m/h (1.6–4 gpm/ft²)
• Total rinse requirement: 2–5 BV*
• Regenerant: 1–8% H₂SO₄, 4–8% HCl

*1 BV (Bed Volume) = 1 m³ solution per m³ resin or 7.5 gals per ft³ resin.

UPW Specific Properties

• Rinse characteristics: UPW grade resins are rinsed with +17.5 Megaohm·cm water to meet stringent ionic and organic residuals.
• Ionic conductivity rinse down, max. (as packaged): 1 µS/cm
• TOC rinse down to 5 ppb: 20 BV (see Figure 3)

Hydraulic Characteristics

Figure 1 shows bed expansion as a function of backwash flow rate and water temperature. Figure 2 shows pressure drop data as a function of service flow rate and water temperature (valid at the start of service with clear water and a correctly classified bed). Figure 3 shows conductivity and TOC rinse performance.

Packaging

• 5 cubic foot fiber drum

Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror