Asymmetric Metal Membrane Filter Element for Submicron Filtration

Asymmetric metal membrane filter element adopts an asymmetric metal powder sintered structure, featuring a dual-layer design composed of a coarse-pore support layer and a fine filtration layer. An approximately 0.3 mm thick precision sintered metal powder membrane is applied to the support layer, providing both high-strength structural support and efficient surface filtration.

Compared to traditional homogeneous sintered filter elements, which rely on depth retention, are prone to clogging, and are difficult to backwash. The BDP-AS element significantly enhances filter ratimg, unit flux, and regenerability by optimizing the pore size gradient and surface filtration mechanism. Its asymmetric structure improves mechanical properties and fluid permeability, enables easy cake release without bridging, and is especially suitable for complex conditions such as high solids content, high viscosity, and high temperature and high pressure.

2 asymmetric metal membrane filter elements

Specifications

Alloy materials: Stainless steels (304L, 316L), titanium and its alloys, nickel, Monel® (Ni-Cu alloy), Inconel® (Ni-Cr-Fe alloy), iron and aluminum alloy, Hastelloy® B, C, and X
Outer diameter range: 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 140 mm
Length range: 50–1500 mm (extensions beyond this range can be achieved by welding)
Structure: Tubular configuration
Connection: Various connections can be configured according to operational requirements (welded or sintered connection)
Special dimensions or port configurations can be customized.

Properties

Table 1: Properties of Asymmetric Metal Membrane Filter Element
Filter Grade	Porosity (%)	Bubble-point Pressure (Pa)	98% Efficiency @ X (μm)	Permeability Coefficients m³/(m²·h·kPa)	Compressive Strength (MPa)
BDP-0.1AS	37	45000	1.0	10	4.5
BDP-0.5AS	37	12800	2.0	60	4.5
BDP-1AS	37	10500	3.2	75	4.5
BDP-3AS	37	6000	8.3	120	4.5
Applied Standard	GB/T 6886-2008	ISO 4003	ISO/TR13353:2002	GB/T 6886-2008	GB/T 6886-2008

Air permeability chart

Water permeability chart

Features

Asymmetric structure, combining strength and permeability
Integrated sintered structure offers stability and high pressure resistance (up to 50 bar)
Support layer features large pore size (100–150 μm) for high flux
Membrane layer provides high precision (0.5 μm) for precision surface filtration
Membrane layer is securely bonded, resistant to impact and alternating loads
Withstands temperatures up to 900  °C, suitable for extreme operating conditions
Excellent backwash performance, easy filter element regeneration, and long service life
Minimum filter rating of 0.1 μm, suitable for high solids content and high viscosity media, with no filter cake bridging