Involves placing a document between two sheets of transparent polyester film, then sealing all four edges of the film. This provides the document with support and helps protect it from possible damages incurred through handling. Encapsulation differs from lamination in that the document is not adhered to the polyester, but instead may be removed at any time by cutting along the edges of the polyester. Encapsulation is not suitable for all documents, as the microclimate inside the capsule may actually accelerate the deterioration of an acidic document. For this reason, a sheet of alkaline buffered paper is often included behind a document in an encapsulate to help absorb some of the acids. Encapsulation is particularly appropriate for very brittle or fragile documents, and for those documents that will be handled frequently.

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