1. acoustic ceiling 2. fiberglass celings 3. sound absorbing 4. ... sound absorbing coefficient , NRC of our ceiling is about 1.0 . sound wave can not produce echo on its ... convenient to convey ,install and decrease unsafe factor. acoustic Ceiling Verified Information This information is Verified by Bureau ... USD 2,000,000 28.6 South Asia USD 1,000,000 14.3 Certification: Certified Picture Certification ...