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Scientific instrument maker Thermo Fisher Scientific Inc. said Monday that it is extending its tender offer for Dionex Corp. shares until May 13 while it waits for regulatory approval in Europe.

Waltham-based Thermo Scientific and Sunnyvale, Calif.-based Dionex agreed to the $2.1 billion deal in December, and Thermo Fisher had expected it to close in the first quarter. But while the merger has received regulatory approval in the U.S., Thermo Fisher is still awaiting final approval in Europe. The European Commission accepted the company's merger filing Monday but now has 25 days — or until May 13 — to review the transaction.

Thermo Fisher said more than 7.7 million Dionex shares, or 44 percent of outstanding shares, had been tendered as of Friday. Thermo Fisher is paying $118.50 per share for the stock.

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