Plastics industry veteran Mike Huff has joined private equity firm Arsenal Capital Partners as an operating partner. Huff most recently had been CEO of compounding firm Citadel Plastics Holdings Inc., which was sold to A. Schulman Inc. for $800 million in March. He had been working in a consulting role at Schulman since the acquisition. “We believe that Mike is an outstanding operating executive who will be able to apply the experience he has attained over the last 35-plus years to our current and new investments,” Arsenal partner John Televantos said in an Oct. 27 news release. Huff had been...