LOFMEM-E

Summary

Product Identification

The LOFMEM™ E Series is a pleated polyethersulfone (PES) membrane cartridge specifically engineered for final filtration of ultrapure water, particularly for microelectronics-grade applications. These filters are inherently hydrophilic and contain no added surfactants or wetting agents.

Key features and benefits include:

• Manufactured, flushed, tested, and packaged in an ISO Class 7 cleanroom environment.
• 100% flushed with 18 MΩ-cm DI water and integrity tested.
• Rapid resistivity rinse-up to 18 MΩ-cm and single-digit ppb TOC levels in less than 30 minutes at 3 gpm per 10-inch element.
• Available with various end cap/adapter configurations to fit industry-standard housings.
• Each filter element is stamped with pore size, lot, and serial number for identification and traceability.

Mechanical / Hydraulic

Filter Specifications

• Media: Asymmetric polyethersulfone membrane
• Inner core, end caps, cage: Polypropylene
• Support layers: Spunbond polypropylene
• Gaskets/O-Rings: Buna-N, EPDM, Silicone, Viton©, Teflon© encapsulated Viton O-Rings
• Micron ratings: 0.03 µm, 0.1 µm, 0.2 µm, 0.45 µm

Dimensions / Parameters

• Nominal lengths: 9.75" (24.7 cm), 10" (25.4 cm), 20" (50.8 cm), 30" (76.2 cm), 40" (101.6 cm)
• Outside diameter: 2.7" (6.9 cm)
• Inside diameter: 1.0" (2.54 cm)
• Surface area: 7.6 ft² (0.72 m²) per 10-inch element

Flow Rate The LOFMEM-E cartridges are designed to minimize differential pressure at various flow rates (per 10" cartridge at 70°F/21°C). See the official PDF for exact tabulated values.

Operating Limits

• Max. sustained operating temperature: 180°F (82°C) at 20 psid (1.38 bar)
• Max. differential pressure:
  • 60 psid @ 80°F (4.14 bar @ 27°C)
  • 30 psid @ 160°F (2.07 bar @ 71°C)
  • 15 psid @ 203°F (1.03 bar @ 95°C)
• Max. reverse differential pressure: 40 psid @ 70°F (2.76 bar @ 21°C)
• Recommended change-out pressure: 35 psid (2.4 bar)

Performance Specifications

• Hot DI Water: Filter cartridges will withstand temperatures of 185°F (85°C) for up to 30 consecutive minutes.
• Cleaning/Sanitization: Compatible with most common chemical cleaning, sanitizing, and sterilizing agents, and with a pH range from 1–14. Consult the factory for specific compatibility information.
• Rinse-Up Volumes (per 10-inch element at 3 gpm):
  • Resistivity rinse-up to 18 MΩ-cm: <30 minutes
  • Rinse-up to single-digit ppb TOC: <120 minutes

Integrity Test Specifications Minimum Diffusive Air Flow (per 10-inch cartridge) values for LOFMEM-E filters wet with water:

• 0.03 µm: ≤ 50 cc/min @ 45 psig (3.1 bar)
• 0.1 µm: ≤ 50 cc/min @ 40 psig (2.8 bar)
• 0.2 µm: ≤ 35 cc/min @ 30 psig (2.1 bar)
• 0.45 µm: ≤ 35 cc/min @ 20 psig (1.4 bar)

Filter Specification Code

The product code follows the format LME-Length-Retention Rating-End Configuration-Gasket or O-Ring.

• Filter Series: LME (LOFMEM-E)
• Nominal Length:
  • -9: 9.75"
  • -10: 10.0"
  • -20: 20.0"
  • -30: 30.0"
  • -40: 40.0"
• Retention Rating:
  • -0.03: 0.03 micron
  • -0.1: 0.1 micron
  • -0.2: 0.2 micron
  • -0.45: 0.45 micron
• End Configuration:
  • DOE: Double Open End
  • -1: 226/Flat Single Open End
  • -2: 222/Fin Single Open End
  • -3: 226/Fin Single Open End
  • -4: 222/Flat Single Open End
  • -10: Double Open End, Internal O-Ring
  • -20: Single Open End, Internal O-Ring
• Gasket or O-Ring:
  • S: Silicone
  • B: Buna-N
  • E: EPDM
  • V: Viton
  • T: FEP/Viton (O-Rings only)

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

Official datasheet (PDF)

Lenntech datasheet mirror