3M and Ceradyne revealed that they have entered a definitive agreement, which will see 3M buy Ceradyne for US$35 per share. The transaction holds an aggregate value of nearly US$860 million, or US$670 million net of cash, cash equivalents, short-term investments and debt acquired. Ceradyne, a major producer of crucibles used in the production of polysilicon chunks for multicrystalline ingots and then wafers, will join the 3M Energy Advanced Materials Division.