Aluminum foil is the best of the widely available

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Unformatted text preview: mercially to package articles for shipment or storage. Portable heat sealers that are easy to use are available commercially, or the packager can seal the foil with a standard household iron. Moisture-Resistant Papers D-63. Several commercial brands of wrapping papers resistant to water and grease are available. Alone they do not provide lasting protection against moisture, but they are effective as an inner wrapping to prevent rubber, wax, and similar substances from sticking to the items in the cache. Rubber Repair Gum D-64. Rubber repair gum is a self-sealing compound mechanics generally use for repairing tires. Rubber repair gum makes an excellent outer wrapping. Standard commercial brands come in several thicknesses, but the 2-millimeter gum is best for caching. The packager can easily produce a watertight seal by placing two rubber surfaces together and applying pressure. The seal should be at least ½-inch wide. Because rubber repair gum has a tendency to adhere to items, the packager must use an inner wrapping of nonadhesive material and leave the backing on the rubber material to keep it from sticking to other items in the cache. Grade C Barrier Material D-65. Grade C barrier material is a cloth impregnated with microcrystalline wax that distributors use extensively for packing items for overseas shipment. This material is widely available and is self-sealing. Although not as effective as rubber repair gum, packagers can use grade C barrier material as an outer wrapping over aluminum foil to prevent perforation of the foil. If the packager is not using an inner wrapping, packages require three layers of grade C barrier material, which may keep the contents dry for as long as three months, but is highly vulnerable to insects and rodents. In addition, the wax wrapping of the material has a low melting point and adhesive properties, so packagers should not use it without an inner wrapping unless it is an emergency. Wax Coating D-66. If no wrapping material is available, packagers can use an outer coating of mic...
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