3838 MFK-618

Summary

Product identification

MFK-618 Microfiltration Elements are part of a 4”, 6” and 8” Spiral Element Series.

• Membrane Chemistry: Proprietary semi-permeable polyethersulfone (PES)
• Membrane Type: MFK-618 with observed separation range of 0.1 micron
• Construction: Sanitary spiral wound with net outer wrap
• Regulatory Status: Compliant with US FDA CFR Title 21.
• Options:
  • Diameter: 3.8”, 6.3”, or 8.3”
  • Feed Spacer: N (31 mil), V (46 mil), H (62 mil), F (80 mil), D (100 mil), or E (135 mil)
  • Outer wrap: Controlled (e.g. NYV) or trimmable (e.g. NYT)
• Membrane Characteristics:
  • The membrane consists of a semipermeable polyethersulfone (PES) layer on a polyester backing material.
  • Pure water flux of the MFK-618 membrane is 2.0-4.4 gfd/psi at 77°F (25°C).

Active Membrane Area

Note: Not all combinations available.

Operating limits

• Typical Operating Pressure: 30 - 120 psi (2.1 - 8.3 bar)
• Maximum Operating Pressure: 140 psi (9.7 bar)
• Typical Operating Temperature Range: 41 - 131°F (5 - 55°C)
• Maximum Operating Temperature:
  • At pH 6.0 - 7.5: 150°F (65.5°C)
  • At pH 3.5 - 6.0: 140°F (60°C)
  • At pH 2.0 - 3.5 and 7.5 – 10.0: 131°F (55°C)
• Cleaning (CIP) Temperature Range: 104 - 122°F (40 - 50°C)
• Allowable pH - Continuous Operation: 2.0 - 10.0
• Allowable pH - Clean-In-Place (CIP): 1.8 - 11.0
• Permeate Pressure: Should not exceed baseline (concentrate) pressure at any time (including online, off-line, and during transition). Reverse pressure will damage the membrane.

Mechanical / hydraulic

Design Pressure Drop

• Per Element:
  • N spacer: 5-15 psi (0.3-1.0 bar)
  • V spacer: 5-20 psi (0.3-1.4 bar)
  • H, F, D or E spacer: 10-20 psi (0.7-1.4 bar)
• Per Vessel (3 In Series):
  • N spacer: 15-45 psi (1.0-3.1 bar)
  • V spacer: 15-60 psi (1.0-4.1 bar)
  • H, F, D or E spacer: 30-60 psi (2.1-4.2 bar)
• Differential Pressure: The maximum differential pressure per module and for 3-in-series housings are listed (refer to above).

Nominal Dimensions

Feed water

Water Quality for Cleaning & Diafiltration

• Turbidity: Maximum feed turbidity is 1 NTU.
• SDI: Maximum feed SDI is 5.0 (15-minute test).

Chlorine and Chemical Exposure

• Recommended chlorine exposure time: 30 minutes per day.
• Residual chlorine concentration during CIP should be 150 ppm @ pH 10.5 or higher.
• Chlorine concentration should never exceed 200 ppm.
• Chlorine should only be added to the cleaning solution after the pH has been adjusted to 10.5 or higher.
• Iron or other catalyzing metals in the presence of free chlorine or hydrogen peroxide will accelerate membrane degradation.
• Sanitizing should be done only after a complete cleaning cycle and with water of acceptable quality.
• Cationic (Positively Charged) Polymers and Surfactants: MFK membranes may be irreversibly fouled if exposed to cationic (positively charged) polymers or surfactants. Exposure to these chemicals during operation or cleaning is not recommended and will void the warranty.
• Lubricants: For module installation, use only water or glycerin to lubricate seals. The use of petroleum or vegetable-based oils or solvents may damage the element and will void the warranty.

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Disclaimer: This summary is based on text extracted from a PDF datasheet. This extraction process may miss figures, footnotes, or the latest revisions. Contractual data for any project must match the specific OEM PDF revision used on that project.

Official datasheet (PDF)

PDF datasheet