Cardinal Health Sterility Maintenance Covers. Also known as dust covers – used after sterilization to help maintain the sterility and cleanliness of the enclosed product. Made of 3 mil low density polyethylene for strength with welded seals to help prevent seal opening in use. Includes a tear opening feature eliminating the need for scissors. Two styles available: Regular, flat cover has on open bottom that can be heat sealed or taped closed after the contents are inserted; Self-Seal cover has an integrated pressure sensitive closure to ensure effective seal integrity.