Avantor Performance Materials and NuSil Technology, both majority-owned by the investment firm New Mountain Capital, plan to merge into a new company with annual sales of more than $700 million. Avantor makes high-purity chemicals for laboratory and other applications. NuSil produces medical- and space-grade silicones. New Mountain Managing Director Matthew Holt says the combined company will have strong positions in bioprocessing and biomaterials and will increase sales by 14% annually. New Mountain bought into Avantor in 2010 and NuSil in 2011.