i3 Membrane GmbH is a privately held specialty materials and separation technology company headquartered in Hamburg, Germany. The company’s name reflects its three core business divisions — Biotech, Lab/Pharma, and Medical — each addressing distinct separation and filtration challenges within the broader life sciences and healthcare sectors. The website is available in English and German, with customers served across Europe and internationally via a direct e-commerce shop and application-based sales model.

The company’s stated philosophy is that membranes can do more than simply filter — a positioning that underpins its development of conductive, metal-coated polymer membranes and electrically driven separation systems that extend membrane functionality into chromatographic purification, sensitive particle analytics, and infection-critical water hygiene. i3 Membrane has recently invested in sustainable packaging and participated in high-altitude stratospheric microplastic research with TUM WARR via its PHILEAS mission collaboration — reflecting a commitment to applied scientific engagement beyond routine commercial supply.

Key Products and Services

Biotech Division — Membrane Chromatography

• Membrane Adsorber (Affinity) — a metal-coated polymer membrane adsorber using affinity ligands for the capture and purification of monoclonal antibodies (mAbs) and other biologics; designed as an alternative to resin-based Protein A chromatography for downstream processing, offering high flow rates, low pressure drops, and scalable single-use formats
• Membrane Adsorber (Ion Exchange) — ion exchange membrane adsorber for polishing and impurity removal steps in biopharmaceutical downstream processing
• Smart Control Unit — a proprietary digital control unit enabling electrically driven elution in membrane chromatography; the core differentiation of i3 Membrane’s biotech platform, applying electrical potential to drive targeted elution of bound proteins without requiring high salt concentrations, reducing process steps and improving product quality
• Applications: purification of monoclonal antibodies and biologics; applicable across upstream harvest, capture, and polishing stages of biopharmaceutical manufacturing

Lab/Pharma Division — Metal-Coated Track-Etched Membranes

• PET Membrane (Gold-Coated) — gold-coated polyethylene terephthalate (PET) track-etched membrane for particle analysis applications; gold coating provides electrical conductivity and surface inertness for SEM/EDX and mass spectrometry-based analytical workflows
• PET Membrane (Aluminium-Coated) — aluminium-coated PET track-etched membrane for particle and microplastic analysis
• PC Membrane (Gold-Coated) — gold-coated polycarbonate track-etched membrane for particle, asbestos, and microplastic analysis
• Air Monitor Cassette — membrane-based air sampling cassette for airborne particle and microplastic collection, compatible with downstream analytical workflows
• Vacuum Filtration Unit — laboratory vacuum filtration unit for sample preparation and particle concentration prior to membrane-based analysis
• Applications: pharmaceutical particle analysis, environmental microplastic analysis, asbestos fibre analysis, and industrial particle characterisation

Medical Division — Point-of-Use Water Filtration

• i3 ONE | Tap — point-of-use (POU) water filter for tap connections in hospital environments; sterile filtration of drinking and handwashing water at point of use for infection prevention against waterborne pathogens including Legionella, Pseudomonas aeruginosa, and non-tuberculous mycobacteria (NTM)
• i3 TWO | Shower — POU water filter for shower heads in hospital wards; prevents aerosolisation of waterborne pathogens to protect immunocompromised and neonatal patients
• i3 FOUR | Dental & ENT — inline water filter for dental units and ENT irrigation systems; reduces microbial contamination at clinical instrument waterlines
• i3 FIVE | Endoscopy — inline water filter for endoscopy water supply; prevents contamination of endoscope water channels during procedures
• Couplings and accessories — connection fittings and adapters for installation of POU and inline filters across varied hospital water infrastructure formats
• Applications: hospital hygiene and healthcare-associated infection (HAI) prevention; birthing tub sterile water supply; neonatology ward water safety; dental and ENT clinical water management

i3 Membrane occupies a technically focused niche as a specialist membrane materials company operating across three distinct but complementary application domains, united by proprietary expertise in metal-coated polymer membrane fabrication and electrically modified separation systems. Within the biopharmaceutical manufacturing sector, the Biotech division’s electrically driven membrane chromatography represents a genuinely differentiated downstream processing technology — applying electrical potential to replace salt-gradient elution in affinity and ion exchange chromatography, which could meaningfully reduce buffer consumption, process complexity, and product aggregation risk relative to conventional resin-based column chromatography. This positions i3 Membrane as an innovation-stage supplier in the downstream bioprocessing equipment market, competing with resin and membrane chromatography offerings from Cytiva, Sartorius, and Merck Millipore, but with a distinctive electrically driven mechanism. The Lab/Pharma division’s gold-coated track-etched membranes serve a well-established analytical niche in pharmaceutical particle characterisation and environmental microplastic analysis. The Medical division addresses hospital infection prevention through point-of-use filtration — a market with sustained demand driven by regulatory and clinical pressure on healthcare-associated infections caused by waterborne pathogens.