BRUSSELS—The European Union's antitrust authorities on Monday approved German pharmaceutical company Merck KGaA's $17 billion proposed purchase of Sigma-Aldrich Corp , a U.S. supplier of laboratory testing materials, but said they were setting a number of conditions on the deal.

The Merck Millipore division focuses on developing, producing and selling tools and products for the life sciences industry. St. Louis-based Sigma-Aldrich is one of the largest makers of chemicals and biological materials used in scientific laboratories.

The Commission said it had concerns the merged entity would have faced too few competitive pressure from the remaining players in the markets for certain laboratory chemicals, which could risk a rise in prices. The two companies are the leading European suppliers of solvents and inorganics used in labs and research centers.

As a result, the two companies have offered to take a series of steps to win approval of the deal.

Sigma-Aldrich will sell off its manufacturing assets in Seelze, Germany, where most of the solvents and inorganics sold by Sigma in Europe are made.

It will also have to divest some brands and trademarks such as Fluka and Hydranal on a worldwide basis. After divesting the assets, the company will have to give a temporary license to the Sigma-Aldrich brand for the supply of solvents and inorganics.

It will also have to transfer customer information and a solution to ensure what the European Commission called a "temporary channel to the market," the EU authorities said in a press release.

Merck Chief Financial Officer Marcus Kuhnert said last month the company continues to expect the acquisition to close by mid-2015, but acknowledged the deal was being held up because of European Union concerns over potential antitrust issues.

Merck KGaA isn't affiliated with Merck & Co. of the U.S.

The proposed merger is the latest instance of consolidation among makers of laboratory testing materials. In 2013, Thermo Fisher Scientific Inc. agreed to pay $13.6 billion to acquire Life Technologies Corp., a primary competitor of Sigma-Aldrich's.

Analysts have said the combination of Merck and Sigma-Aldrich would enable the new company to better compete for business from pharmaceutical companies, which have sought to cut costs by limiting the number of suppliers they use.

Write to Laurence Norman at laurence.norman@wsj.com

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