Objects made of rubber should not be placed in time capsules since rubber deteriorates over time, releasing sulfur. All wood, especially oak, gives off acid vapors and must be sealed away from electronic equipment or metal articles, especially those made of lead, or lead-containing alloys, in the time capsule. Textiles should be clean and insect free. Acts as a humidity buffer if temperature changes. May deteriorate in oxygen atmosphere.
Favorable Conditions Prepare contents to be placed in the time capsule in a cool, dry environment.
Silica gel will help to buffer the humidity in the capsule. It is sold in granular form in art supply stores, hardware stores, and some department store closet shops. It must be conditioned to a low humidity level before use. Argon or nitrogen gas may be introduced into the capsule to replace oxygen. Bottled gas companies can supply these gases.