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Line 159: + − # Double dip the wrapped core in melted wax or plastic. String should be used to dip the core, not wire, because wire can rip the aluminum foil. The string should be cut off and the ends also dipped in the wax or plastic. This wax or plastic coating protects the core and the aluminum foil during shipping and storage.+ − Note that wax and plastic are permeable and do not serve as barriers to oxygen or water vapor. However, CoreSeal® is relatively impermeable to water vapor ([[:Image:Table rose time-value-of-money 1.jpg|Table 3]]) (Bajsarowicz, unpubl. data), as are several common polymers ([[:Image:Table rose time-value-of-money 1.jpg|Table 4]]).<ref name=Hunt_etal_1988 />+ + + + − [[File:Table rose time-value-of-money 1.jpg|thumbnail|'''Table 4. Permeation rates for various polymers.]]+
Core alteration and preservation (view source)
Revision as of 16:58, 10 March 2014
, 16:58, 10 March 2014→Methods of core preservation
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* Double dip the wrapped core in melted wax or plastic. String should be used to dip the core, not wire, because wire can rip the aluminum foil. The string should be cut off and the ends also dipped in the wax or plastic. This wax or plastic coating protects the core and the aluminum foil during shipping and storage.
Note that wax and plastic are permeable and do not serve as barriers to oxygen or water vapor. However, CoreSeal® is relatively impermeable to water vapor (Table 3),<ref name=Bajsarowicz /> as are several common polymers (Table 4).<ref name=Hunt_etal_1988 />
{| class="wikitable"
|+ Table 4. Permeation rates for various polymers.
|-
! || Oxygen (cm<sup>3</sup> x mil/100 in.<sup>2</sup> x D x atm) || Water vapor (g x mil/100 in.<sup>2</sup> x D x atm) || Carbon dioxide (cm<sup>3</sup> x mil/100 in.<sup>2</sup> x D x atm)
|}
===Barrier foil laminate===
===Barrier foil laminate===