There are a number of very specific restrictions. However, most mineral fiber ceiling panels will be acceptable. Details are available here
CTC has a proprietary finish that is common to a number of products - Overtone®. This monolithic finish is unusually resilient. The Overtone finish has been tested on the “Gardner Straight Line Washability and Abrasion Machine” and it withstood over 5,000 scrub cycles. Products that employ the Overtone® finish are expected to have an unusually long life and as such should be candidates for reuse if a space is being renovated. This is the very definition of “sustainability”. LEED 2009 NC provides a credit under “Maintaining Material Non-structural Items (MR 1.2)” for the reuse of ceiling systems. CTC products using the Overtone finish are: Adagio, Symphony F, Symphony G, Symphony M and TufCore.