What is an MTC – Grade B Rating ?

Certain types of computer media (CDs, DVDs, USBs, and memory sticks) are less sensitive to heat and humidity than tapes, cartridges, hard drives, etc. These less-sensitive items can be safely stored and protected inside some products that are designed to protect paper records. Products that carry the MTC – Grade B rating have been tested and certified to provide adequate protection for these items. Products that are rated Class 125 are designed to store and protect all types of computer media, and should be used whenever the more sensitive items need protection.