 Lydall, Inc. LDL, a leading U.S. manufacturer of value-added engineered materials and specialty filtration solutions that create a cleaner, safer and quieter world, today announced the signing of a 13.5 million contract award with the United States Department of Defense DOD. The contract will support Lydalls investment in two new meltblown production lines including one that had been announced on June 2 in its Rochester, New Hampshire facility. 