Merck Millipore
Former Merck Group life-science business brand created through the 2010 acquisition of Millipore Corporation and replaced after the 2015 integration with Sigma-Aldrich.
Last updated August 26, 2026
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Overview
Merck Millipore was the global life-science business brand used by Merck KGaA after its acquisition of Millipore Corporation in 2010. It should not be confused with the separate United States pharmaceutical company Merck & Co.; the two businesses descend from different corporate histories and use different brand structures. The Merck Millipore name brought together Millipore's established portfolio of membrane filters, water-purification systems, laboratory testing products, separation technologies, bioprocessing equipment, analytical services, and research reagents with Merck's broader chemical and pharmaceutical capabilities. Millipore originated in the United States in the early 1950s. Lovell Corporation had developed membrane-filtering technology for separating molecular components in fluid samples under a U.S. Army contract. After the technology became available for commercial use, Jack Bush acquired the relevant rights and incorporated the Millipore Filter Corporation in 1954. The name was derived from the concept of a membrane containing very large numbers of microscopic pores. Millipore initially concentrated on microporous membrane products and related laboratory filtration applications, eventually broadening into water purification, chromatography, cell biology, drug discovery, and biopharmaceutical manufacturing. The company grew internationally from the 1960s onward, establishing subsidiaries in France, Germany, Japan, Spain, and other markets, while adding manufacturing capacity in the United States, France, Ireland, and elsewhere. Its product development helped establish several enduring laboratory categories. These included disposable Millex syringe filters, Pellicon cassette systems for bioprocess separation, Milli-Q ultrapure-water systems, Durapore low-protein-binding membranes, and a wide range of filtration and separation products based on cellulose esters, polycarbonate, polyvinylidene fluoride, polypropylene, and related materials. Millipore also expanded through acquisitions. Waters Associates brought chromatography media and high-performance liquid-chromatography capabilities, although the Waters chromatography division was later divested. Acquisitions such as Amicon, Tylan General, Bioprocessing Limited, NovAseptic, Newport Bio Systems, Serologicals, Guava Technologies, and BioAnaLab extended the company into gas purification, chromatography, aseptic bioprocess components, process containers, antibodies, cell analysis, biologics testing, and vaccine analysis. The 2006 purchase of Serologicals was particularly important for drug-discovery and cell-biology activities, adding businesses including Chemicon, Upstate, Linco, and Celliance. Millipore was a public company for much of its independent existence. It moved from over-the-counter and Nasdaq trading to the New York Stock Exchange in 1987 under the symbol MIL and had been included in the S&P 500. Merck KGaA acquired the company in 2010 for approximately EUR 5.3 billion, according to contemporary reference material, and incorporated it into its life-science activities under the EMD Millipore and later Merck Millipore branding. In 2015, Merck completed its acquisition of Sigma-Aldrich and combined that business with Merck Millipore. The Merck Millipore identity was then replaced by the broader Merck life-science organization. In the United States and Canada, the successor life-science business is known as MilliporeSigma, while Merck uses its global life-science branding in other markets.
History
Millipore's origins lay in membrane technology developed by Lovell Corporation in the early 1950s. Under a U.S. Army Chemical Engineers contract, Lovell worked on membrane devices capable of separating molecular components in fluid samples. When the technology was declassified in 1953, it became available for commercial exploitation. Jack Bush, who worked with the technology at Lovell, acquired the rights and established the Millipore Filter Corporation in 1954. The company name referred to the extremely small pores in its membranes, and the term later became broadly associated with microporous filtration. The company's early technical foundation was the production of thin membrane filters made from cellulose esters and other materials. By the end of the 1950s, Millipore offered membrane sheets with pore sizes ranging approximately from 0.2 to 20 micrometres. Its first patent, granted in the mid-1950s, concerned microporous nylon film developed by Stanley Lovell and Jack Bush. Over time, the company moved beyond early cellulose-based products to membranes based on polycarbonate, polyvinylidene fluoride, polypropylene, and other engineered materials. Millipore began international expansion during the 1960s, opening subsidiaries in France, Germany, and Japan and later establishing operations in Spain and other countries. Product development broadened the business from basic filtration into laboratory water treatment and bioprocessing. The company introduced the Super-Q water-purification system in 1967, Pellicon cassette technology for biotherapeutic purification in 1968, disposable Millex syringe filters in 1971, and the Milli-Q ultrapure-water system in 1973. Manufacturing facilities were subsequently established in Jaffrey, New Hampshire; Molsheim, France; Danvers, Massachusetts; and County Cork, Ireland. Acquisitions became a central part of Millipore's expansion. The 1979 purchase of Waters Associates added chromatography media and high-performance liquid-chromatography capabilities. Millipore later divested the Waters Chromatography Division in 1994 as it refocused on membrane and related life-science activities. Acquisitions of Amicon, Tylan General, Bioprocessing Limited, and other companies expanded separation science, gas purification, and chromatography. A 2001 spin-off of the Microelectronics Division created Mykrolis, which later merged with Entegris. During the 2000s, Millipore intensified its focus on biopharmaceutical research and manufacturing. It acquired MicroSafe, NovAseptic, Newport Bio Systems, Serologicals, Guava Technologies, and BioAnaLab. These transactions added contract testing, aseptic components, process containers, antibodies, cell-biology reagents, cell-analysis systems, and testing services for biologic drugs and vaccines. The company also opened or expanded research, training, and biomanufacturing facilities in Massachusetts, Missouri, Ireland, and Singapore. By the late 2000s, it offered both upstream cell-culture technologies and downstream separation systems for biopharmaceutical production. Millipore became a public company with a substantial international footprint. It moved from over-the-counter and Nasdaq trading to the New York Stock Exchange in 1987 under the symbol MIL and was included in the S&P 500. Merck KGaA acquired Millipore in 2010 for approximately EUR 5.3 billion, bringing it into the EMD Group and creating the EMD Millipore life-science business. Merck later acquired Sigma-Aldrich, completing the transaction in 2015. Sigma-Aldrich was combined with Merck Millipore, and the Merck Millipore name was retired as the organization adopted a new global structure. In North America, the successor operation uses the MilliporeSigma name; elsewhere, it operates within Merck's life-science business. Merck Millipore is therefore a historical operating brand rather than an independent active company.
- 2015
Integration with Sigma-Aldrich
[1]Merck completed its Sigma-Aldrich acquisition and combined the business with Merck Millipore, replacing the standalone Merck Millipore identity.
- 2010
Acquisition by Merck KGaA
[1]Merck KGaA acquired Millipore and incorporated it into its life-science operations.
- 2006
Serologicals acquired
[1]The acquisition expanded Millipore's drug-discovery, antibody, cell-biology, and stem-cell research offerings.
- 2001
Microelectronics Division spun off
[1]Millipore separated its Microelectronics Division into Mykrolis, which later merged with Entegris.
- 1987
New York Stock Exchange listing
[1]Millipore moved its public listing from Nasdaq to the New York Stock Exchange under ticker MIL.
- 1979
Waters Associates acquired
[1]The acquisition added chromatography media and high-performance liquid-chromatography capabilities.
- 1973
Milli-Q system introduced
[1]The company launched the Milli-Q laboratory ultrapure-water system.
- 1971
Millex syringe filter launched
[1]Millipore introduced a disposable syringe-filter product for laboratory sample preparation.
- 1968
Pellicon cassette technology introduced
[1]The Pellicon cassette product extended Millipore's membrane technology into biotherapeutic purification.
- 1967
Super-Q water-purification system introduced
[1]Millipore entered a broader laboratory water-purification market with the Super-Q system.
Products and positioning
A science-led supplier of filtration, purification, analytical, research, and biomanufacturing technologies for pharmaceutical, biotechnology, academic, industrial, and semiconductor customers.
Laboratory water purification · 1973
Milli-Q
A laboratory water-purification platform designed to produce ultrapure water for analytical, biological, pharmaceutical, and research applications. Introduced in the 1970s, Milli-Q became one of the most recognizable product families associated with Millipore and continued within Merck's later life-science portfolio.
Disposable syringe filters · 1971
Millex
A family of disposable syringe filters used to clarify and sterilize small-volume laboratory samples before analysis or other downstream procedures. The original Millex product, introduced in 1971, helped establish disposable syringe filtration as a routine laboratory sample-preparation format.
Bioprocess membrane separation · 1968
Pellicon
Cassette-based membrane systems for concentration, purification, and processing of biological materials. Pellicon extended Millipore's membrane expertise into biopharmaceutical manufacturing and became part of the company's downstream-processing offering.
Membrane filtration · 1980
Durapore
A low-protein-binding polyvinylidene fluoride membrane product family intended for filtration applications in laboratories and bioprocessing. Its material properties supported applications where protein recovery and compatibility with biological samples were important.
Laboratory and microbiological filtration · 1954
Millipore membrane filters
Microporous membranes and filter assemblies used for particle removal, microbiological testing, sample preparation, and process control. The portfolio evolved from early cellulose-ester and nylon membranes to engineered materials including polycarbonate, PVDF, and polypropylene.
Biopharmaceutical manufacturing
Bioprocessing systems and aseptic components
A broad group of single-use process containers, aseptic components, and related systems developed organically and through acquisitions such as NovAseptic and Newport Bio Systems. These offerings addressed fluid handling, contamination control, and manufacturing workflows for biologic medicines.
Brand decisions
2015
Integration with Sigma-AldrichM&ABackground
Merck expanded its life-science activities through the acquisition of Sigma-Aldrich, creating substantial overlap and complementarity with the existing Merck Millipore organization.
Action taken
Merck completed the Sigma-Aldrich acquisition and merged it with Merck Millipore into a broader life-science business.
Aftermath
The Merck Millipore brand was replaced by successor branding. In the United States and Canada, the combined business became known as MilliporeSigma.
2010
Merck KGaA acquisition of MilliporeM&ABackground
Millipore was an established international supplier of membrane filtration, laboratory water systems, separation technologies, and biopharmaceutical products. Merck KGaA sought to strengthen its position in the global life-science supply market.
Action taken
Merck KGaA acquired Millipore Corporation and incorporated the business into its EMD life-science organization, using the EMD Millipore name.
Aftermath
Millipore's portfolio and capabilities became part of Merck's life-science business, while the independent public company ceased to exist.
Transaction value. Approximately EUR 5.3 billion (2010 transaction)
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