Exposure to asbestos has been proven to cause cancer and mesothelioma. This old gray duct seam tape was very commonly used in older homes and buildings on HVAC duct work. It usually contains 60-80% asbestos.
When it’s loose In poor condition (friable) it poses a great hazard.
If you think you might have this in your home or business call AZIAQ TESTING to get an inspection. Call (480) 823-2326