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Cellulose is the most abundant polymer found in nature and in some forms is used as heat-sealable paper for medical packaging applications where it acts as a filter to particulates and microorganisms, while at the same time permitting free passage of gas and water vapor during sterilization. This paper must also be heat-sealable over plastic trays that contain medical instrumentation. The bond of the paper to the plastic must be sufficiently strong, but at the same time capable of being peeleddoi:10.1017/s1431927605502551 fatcat:7spamq6r75hrjnoigbps4irkqa