 TONAWANDA, N.Y MANCHESTER, Conn.--BUSINESS WIRE--Unifrax, a leading global provider of high-performance specialty materials focused on thermal management, specialty filtration, battery materials, emission control and fire protection applications backed by Clearlake Capital Group, L.P. together with its affiliates, Clearlake, today announced the completion of its previously announced acquisition of Lydall, Inc. NYSE: LDL, Lydall or the Company, a leader in the design and production 