Thermo Fisher Scientific is nearing a deal for Solventum’s purification and filtration business, according to people familiar with the matter. A transaction is expected to value the filtration business between $3.

M health care spinoff Solventum is selling its purification business to Thermo Fisher Scientific for $4.1 billion in cash to pay down its billions in outstanding debt. Solventum CEO Bryan Hanson said in a news release that the sale,

Waltham-based Thermo is buying the business from Solventum, a Minnesota-based company that spun off from manufacturing conglomerate 3M roughly one year ago.