METHOD II PACKAGING

WHEN TO APPLY – Method II preservation is used when items with high value and a highly critical nature need to be protected from damage that occurs due to the effects of water vapor. It is used on mechanical or electronic devices including assemblies with functional components which, because of their nature, can not be treated with a contact preservative, such as grease or cosmoline.

HOW METHOD II PROTECTS – Tests have proven that the corrosion of an item will not occur when a relative humidity of 30 percent is maintained within a barrier such as Marvelseal 360 (MIL-B-131 Class 1). Complete protection of the item packaged by using Method II is obtained by keeping the relative humidity below this level, usually 20 percent relative humidity is established in order that small leaks inadvertently occur will not raise relative humidity higher than 30 percent during the normal storage period of 18 months to 2 years. The electives of Method II rest upon five factors.