Support Layer: Thickness 120-180 μm, Porosity 45-55%

Q: What is the primary function of the support layer in RO membranes?

The support layer provides mechanical stability to withstand high operating pressures, creates flow channels for permeate collection, and supports the thin-film polyamide active layer without compromising filtration performance.

Q: How does support layer porosity affect RO membrane performance?

Optimal porosity (45-55%) ensures efficient permeate flow with minimal pressure drop while maintaining structural integrity. Too high porosity reduces mechanical strength; too low porosity increases flow resistance and energy consumption.

Component Specifications

Definition

The support layer is a porous structural component in composite reverse osmosis membranes, typically made from non-woven polyester or polysulfone materials. It provides mechanical strength to withstand operational pressures up to 1000 psi, creates flow channels for permeate collection, and supports the active polyamide layer while maintaining consistent porosity for optimal water flux.

Working Principle

Provides mechanical support through a porous structure that distributes hydraulic pressure evenly across the membrane surface while allowing permeate water to flow through to collection channels without creating backpressure or flow restrictions.

Materials

Non-woven polyester fabric (PET), polysulfone (PSf), or polyethersulfone (PES) with controlled porosity between 40-60%, thickness 100-200 μm, pore size 0.1-1.0 μm.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Porosity	45-55%
Thickness	120-180 μm
Burst Strength	≥ 500 kPa
Air Permeability	2-5 cm³/cm²/s
Tensile Strength	≥ 50 N/cm
Chemical Resistance	pH 2-12, chlorine < 0.1 ppm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 2941, ASTM D3786, DIN 53887

Parent Products

This component is used in the following industrial products

Reverse Osmosis Membrane

A semi-permeable membrane used in reverse osmosis systems to remove dissolved solids, ions, and contaminants from water by applying pressure to overcome osmotic pressure.

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Engineering Analysis

Risks & Mitigation

Delamination from active layer
Compaction under high pressure
Chemical degradation from oxidants
Biological fouling in pores
Uneven flow distribution

FMEA Triads

Trigger: Inadequate material selection
Failure: Support layer compaction under pressure
Mitigation: Use polysulfone materials with higher glass transition temperature and implement pressure cycling protocols

Trigger: Poor bonding with active layer
Failure: Delamination during operation
Mitigation: Apply surface treatment (plasma or chemical activation) and optimize adhesive application parameters

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thickness ±10 μm, Porosity ±3%, Dimensional stability < 1% change after 1000 hours at 45°C

Test Method

ASTM D3786 for burst strength, ISO 2941 for hydraulic pressure resistance, SEM analysis for pore structure verification

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Support Layer

Manufacturer profiles associated with Support Layer.

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Frequently Asked Questions

What is the primary function of the support layer in RO membranes?