Mylar

Archival polyester film (polyethylene terephthalate), such as Mylar Type D or Melinex, is a transparent, strong, inert, and durable material suitable for use in encapsulation.

Encapsulation is a safe and easy procedure commonly used by many museums and archives for storing and protecting frequently handled paper artifacts.
 * It allows the artifact to be easily handled and viewed through the transparent encapsulation material.
 * It protects the artifact against potential physical damage during display, study, or storage
 * It is readily and easily reversible
 * It is easy to apply[1]

The static cling of two sheets of polyester will hold even fragile documents, enabling them to be photographed with ease and without damage due to handling. They may also be used to encase thin non-paper items. [2]

//Sleeve Protectors:// University Products, Archival Melinex Polyester Sleeve Protectors Item no. 780-4070 (photo) [3]
 * ~ Qty ||~ Item No. ||~ Sleeve Size ||~ 1 ||~ 3 ||~ 10+ ||~ Ship Info ||
 * 25/Pkg ||
 * || 780-4070 || 3.625" x 5.75" || $14.95 || $13.20 || $11.60 ||  ||

//Polyester Envelopes:// Polyester Envelopes from University Products: (photo)[4]
 * ~ Qty ||~ Item No. ||~ Size ||~ Fits Up To ||~ Thickness ||~ Open Side ||~ 1 ||~ 5 ||~ 10+ ||~ Ship Info ||
 * Package of 25 ||
 * || 565-3580 || 3.5625" x 8.125" || 3.5" x 8" || 4 mil || 8.125" || $28.90 || $28.10 || $26.75 ||  ||

//Rolls:// Clear Polyester for Encapsulation, University Products (photo)[5]
 * ~ Qty ||~ Item No. ||~ Size ||~ Gauge ||~ 1 ||~ Ship Info ||
 * Small Sheets - 25/Pkg ||
 * || 415-1012 || 10" x 12" || 0.002 || $16.19 ||  ||

Suppliers:[6] Transilwrap of Canada Ltd., Scarborough ON, [] Commercial Plastics & Supply, Toronto ON, [|http://www.plastic1.com] Dupont Division Canada, Toronto ON, (416)362-5621 Carr McLean, Toronto ON, http://www.carrmclean.ca/ University Products of Canada, Mississauga ON, []

[1] CCI notes 10/11: //Encapsulation.// [2] Carr McLean,  [3] University Products, //Archival Melinex Polyester Sleeve Protectors//  [4] University Products, //Archival Polyester Envelopes//,  [5] University Products, //Clear Archival Polyesterfor encapsulation,  [6] CCI notes 10/11: //Encapsulation.//