NDX TFC 500-700Da

Summary

Product identification

Synder's Nanofiltration membranes, model NDX, are engineered for optimal performance in both flux and rejection. NDX membranes are part of the TFC (Thin Film Composite) family.

• Polymer: Proprietary PA TFC
• Approx. Molecular Weight Cutoff: 500-700 Da

Operating limits

Recommended Operating Parameters

• Maximum Operating Pressure:
  • 600 psi (4,137 kPa) if T <95°F (35°C)
  • 435 psi (3,000 kPa) if T >95°F (35°C)
• Maximum Temperature: 50°C (122°F)
• pH Range @ Max Temperature: 4-9
• pH Range @ Ambient Temperature: 4-10

Cleaning Parameters

• Maximum Temperature (Short term <30 min): 40°C (104°F)
• pH Range @ Max Temperature: 3-10
• pH Range @ Ambient Temperature: 3-10.5

Product water

NDX membranes are suitable for dye concentration and dye de-salting applications. Nanofiltration membranes operate at lower pressures than reverse osmosis membranes while still achieving high rejection of divalent and monovalent ions. They can greatly reduce levels of hardness, nitrates, sulfates, tannins, turbidity, TDS, and moderate levels of salt from feed water streams.

Membrane Performance (NDX)

• Typical Operating Flux: 35-45 GFD
• Avg MgSO₄ Rejection¹: 95.0%
• Avg NaCl Rejection²: 40.0%
• Avg Lactose Rejection³: 90.0%

Test Conditions

¹For MgSO₄ Rejection: 2,000 ppm MgSO₄ solution at 110 psi (760 kPa) operating pressure, 77°F (25°C). ²For NaCl Rejection: 2,000 ppm NaCl solution at 110 psi (760 kPa) operating pressure, 77°F (25°C). ³For Lactose Rejection: 2% Lactose solution at 110 psi (760 kPa) operating pressure, 77°F (25°C).

Mechanical / Hydraulic

• Pressure Drop:
  • Maximum per Element: 15 psi (103 kPa)
  • Maximum per Housing: 60 psi (414 kPa)
• Chlorine Tolerance: 500 ppm hours, dechlorination recommended.

Element Dimensions & Weight

The datasheet provides dimensions (diameter, length, PWT ID/OD, tube extension) and dry weight for various element models across 1.8”, 2.5”, 4”, and 8” sizes. For example:

• 1812TM: Diameter 1.8” (4.6 cm), Length 11.75” (29.8 cm), Dry Weight 1.0 lb (0.9 kg)
• 8040HF: Diameter 7.9” (20.1 cm), Length 40.0” (101.6 cm), Dry Weight 35.0 lb (15.9 kg)

See the official PDF for exact tabulated values for all models.

NF Membrane Area

Membrane area in square feet varies by element model and feed spacer thickness (e.g., 24, 31, 46, 65, 80 mils). See the official PDF for exact tabulated values.

Recommended Element Cross Flow Rate

Recommended cross flow rates in m³/hr and gpm are provided for different element types (1.8”, 2.5”, 4”, 8”) across various feed spacer thicknesses (24, 31, 46, 65, 80 mils). Note: The recommended cross flow rate will be subject to differential pressure limitations and specific applications. See the official PDF for exact tabulated values.

Technical Notes

Custom element designs are available for sizes not listed, requiring specifications for outer diameter (OD) or vessel/housing inner diameter (ID), element inner diameter (ID), and length. Elements can be provided with or without a controlled bypass tail, and additional feed spacers are available. Trials should be conducted to determine optimal application conditions.

---

Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions. Contractual data must always match the OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet