DOW FILMTEC™ Large Commercial 4040 Reverse Osmosis Elements Low Working Pressure Polyamide Membrane Material

Product Description:
The DOW FILMTEC™ LC 4040 product range offers an excellent selection of reverse osmosis membranes designed for commercial applications. These membranes meet a wide range of customer needs, including the production of high-purity water and low total system costs. Dow’s fully automated production process ensures the highest level of consistency, minimizing the total cost of ownership for water treatment systems.

• LC HR-4040: Produces high-quality water with state-of-the-art RO membrane technology.

• LC LE-4040: Delivers high-quality water at low pressure under harsh water conditions, using Dow’s innovative, proprietary technology for low energy applications.

Product Specifications:

Test Conditions for Permeate Flow and Salt Rejection:
2000 ppm NaCl, 77°F (25°C), 15% recovery, pH 8, applied pressure 225 psig for LC HR and 125 psig for LC LE.
Permeate flows for individual elements may vary +/-15%.
Specifications may be periodically updated for improvement.

Solute Rejection for LC HR-4040:

Solute	Stabilized Rejection (%)
NH4+	98.8
NO3-	98.2
SiO2	99.8
Boron	80.0

Operating Limits:

Note: Maximum temperature for continuous operation above pH 10 is 95°F (35°C).

General Information:

Proper start-up of reverse osmosis water treatment systems is crucial for preparing the membranes and preventing potential damage due to overfeeding or hydraulic shock. A gradual startup sequence ensures that system operating parameters meet design specifications to achieve water quality and productivity goals.

• Before Start-up: Membrane pretreatment, loading, calibration, and system checks should be completed. Refer to the application literature “Start-Up Sequence”for more details.

• During Start-up: Gradually increase feed pressure over a 30-60 second timeframe and cross-flow velocity over 15-20 seconds. Discard permeate from the first hour of operation.

Important Information:

• Keep membranes moist at all times after initial wetting.

• If operating limits are not followed, the warranty will be voided (see Form No. 609-35010).

• To prevent biological growth during prolonged shutdowns, immerse membranes in a preservative solution.

• The customer is responsible for the effects of incompatible chemicals and lubricants on membranes.

• Maximum pressure drop across an entire pressure vessel (housing) is 50 psi (3.4 bar).

• Avoid static permeate-side backpressure.

Regulatory Note:

These membranes may be subject to drinking water application restrictions in some countries. Please verify the application status before use and sale. The use of this product does not guarantee the removal of cysts and pathogens; effective pathogen reduction depends on the complete system design, operation, and maintenance.

Legal Disclaimer:

No freedom from patents owned by Dow or others is to be inferred. The customer is responsible for determining the appropriateness of products for their use and for complying with applicable laws and regulations. Dow assumes no liability for the information in this document.

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DOW FILMTEC™ Large Commercial 4040 Reverse Osmosis Elements Low Working Pressure Polyamide Membrane Material Images